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1. general description the SSL21081T is a high-voltage integrated circuit (ic) for driving led lamps in general mains non-dimmable lig hting applications. the main benefits are: ? small printed-circuit board (pcb) footprint; compact solution ? high efficiency (up to 95 %) ? ease of integration ? low electronic bill of material (bom) the ic incorporates a 300 v mosfet. the ic works as boundary conduction mode conv er ter s, typically in buck configuration. it has been designed to start up directly from the hv supply by an internal high-voltage current source. thereafter, the dv/dt supply is used with capacitive coupling from the drain or any other auxiliary supply. th is function provides full flexibility in the application design. the ic consumes 1.3 ma of supply current with an in ter nal clamp limiting the supply voltage. the ic provides accurate output current contr o l with led current accuracy within 5 %. it can be operated using pulse-width modulation (pwm) current regulation. it has many protection features including easy led temperature feedback. 2. features and benefits ? led driver ics for driving led stri ngs from a rectified mains supply ? high -efficiency switch mode buck driver product family: ? dr iver with integrated 300 v (d c) power switches ? con troller with power-efficient boundary conduction mode of operation with: ? no reverse recovery loss es in fre ewheel diode ? zero current switching (z cs) for turn-on of switch ? zero volt age or valley swit ching for turn-on of switch ? min imal required inductance value and size ? dire ct pwm current regulation possible ? fa st transient response through cycle-by-cycle current control: ? negligible a c mains ripple at led cu rrent and minimal total capacitor value ? no over or undershoots in the led current SSL21081T compact non-dimmable led driver ic rev. 6 ? 3 october 2013 product data sheet
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 2 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic ? internal protections: ? un dervoltage lockout (uvlo) ? l eading-edge blanking (leb) ? ov ercurrent protection (ocp) ? sh ort-winding protection (swp) ? in ternal overtemperature protection (otp) ? br ownout protection ? output shor t protection (osp) ? lo w component count led driver solution (see f igure 3 ): ? no schottky dio d e required due to zcs ? ea sy external temperature protection with a single ntc resistor ? option for sof t-start function ? comp atible with wall swit ch es with built-in indication light during standby 1 ? ic lifetime easily matches or surpasses led lamp lifetime 3. applications SSL21081T products are intended for compact mains non-dimmable led lighting applications with accurate fixed current out put for single mains input voltages. mains input voltages include 100 v (ac), 120 v (ac). the output signal can be modulated using a pwm sign al. 1. the hotaru switch is a well-known wall switch with built-in light
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 3 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 4. quick reference data [1] an internal clamp sets the supply voltage. the current into the vcc pin must not exceed the maximum idd value (see table 5 ). 5. ordering information 5.1 ordering options remark: all voltages are in v (ac) unless otherwise specified. table 1. quick reference data symbol parameter conditions min typ max unit v cc supply voltage operating range [1] 8 - 16 v r dson drain-source on-state resistance t j = 25 ?c 2.05 2.3 2.55 ? t j = 125 ?c 3.05 3.45 3.85 ? f conv conversion frequency - 100 - khz i drain current on pin drain ? 2 - +2 a v drain voltage on pin drain ? 0.4 - +300 v table 2. ordering information type number package name description version SSL21081T so8 plastic small package outline body; 8 leads; body width 3.9 mm sot96-1 table 3. ordering options type input voltage internal mosfet characteristics package SSL21081T 100 v; 120 v 300 v (dc); 2.3 ? so8
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 4 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 6. block diagram fig 1. SSL21081T block diagram ddd -)(7 + 9 9&& 17& *1' '9'7 '5$,1 6285&( 9 6833/< ,17(51$/ 5(*8/$725 $1' %$1'*$3 g9gw 6833/< 9$//(< '(7(&7,21 72))0$; /2*,& 7210$; %/$1. /2*,& &21752/ $1' 3527(&7,21 17& )81&7,21 7+(50$/ 6+87'2:1 325 9!9
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 5 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 7. pinning information 7.1 pinning 7.2 pin description fig 2. SSL21081T pin configuration (so8) ,& +9 '5$,1 6285&( *1' 9&& *1' 17& '9'7 ddq table 4. pin description symbol pin (so8) description hv 1 high-voltage supply pin source 2 low-side internal switch vcc 3 supply voltage ntc 4 led temperature protection input dvdt 5 ac supply pin gnd 6, 7 ground drain 8 high-side internal switch
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 6 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 8. functional description 8.1 converter operation the converter in the SSL21081T is a boundary conduction mode (bcm), peak current controlled system. figure 3 shows the basic application diagram. figure 4 shows the waveforms. this converter type operates at the boundary between continuous and di scontinuous mode. energy is stored in induct or l each period that the switch is on. the inductor current i l is zero when the internal mosfet switch is switched on. thereafter, the amplitude of the current build-up in l is proportional to v in ? ? v out and the time that the internal mosfet switch is on. when the internal mosfet switch is switched off, the current continues to flow th rough the freewheel diode and the output capacitor. the current then falls at a rate proportional to the value of v out . the led current i led is almost equal to half the peak switch current. as soon as the inductor current i l is zero, a new cycle is started. fig 3. basic SSL21081T application diagram ddq 5 lquxvk 17& *1' 6285&( 17& 5 vhqvh / '9'7 '5$,1 9 vhf /('v +9 9&& ,&
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 7 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 8.2 valley detection a new cycle is started when the pr imary switch is switched on (see figure 4 ). following time t 1 , when the peak current is detected on the source pin, the switch is turned off and the secondary stroke starts (3). when t he secondary stroke is complete and the coil current at t 3 equals zero, the drain voltage starts to oscillate around the v in ? v out level. the amplitude equals v out . a special feature, called valley de tection is an in tegrated part of the SSL21081T circuitry. dedicated built -in circuitry connected to the drain pin, senses when the voltage on the drain of the switch has reached its lowest value. the next cycle is then started and as a result the capacitive switching losses are reduced. if both the frequency of t he oscillations and the volt a ge swing are within the range specified (f ring and ? v vrec(min) ) for detection, a valley is detected and accepted. if a valid valley is not detected, the secondary stroke is continued until the maximum off-time (t off(high) ) is reached. then the next cycle is started. fig 4. buck waveforms and valley detection ddq ghpdjqhwl]dwlrq 9 ,1 ydooh\ lqwhuqdo026)(7 vzlwfk 9 *$7( 9 ' , / 9 287 pdjqhwl]dwlrq w w w w w 7
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 8 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 8.3 protective features the ic has the following protective features: ? undervoltage lockout (uvlo) ? leading-edge blanking (leb) ? overcurrent protection (ocp) ? internal overtemperature protection (otp) ? brownout protection ? short-winding protection (swp) ? output short protection (osp) ? led overtemperature control and protection the swp and the osp are latched protections. th ese pr otections cause the ic to halt until a reset (a resu lt of power cycling) is executed. when v cc drops to below v cc(rst) , the ic resets the latch protection mode. th e internal otp and led over temperature protections are safe-restart protec tions. the ic halts, causing v cc to drop to below v cc(stop) , triggering a start-up. when v cc drops to below v cc(rst) , the ic resets the latch protection mode. switching starts only when a no fault condition exists. 8.3.1 undervoltage lockout (uvlo) when the voltage on the vcc pin drops to below v cc(stop) , the ic stops switching. an attempt is made to restart by supplying v cc from the hv pin voltage. 8.3.2 leading-edge blanking (leb) to prevent false detection of the short-windi ng or overcurrent, a blanking time following switch-on is implemented. when the internal mosfet switch switches on, there can be a short current spike due to capacitive discharge of voltage over the drain and source and the charging of the gate to source capacitance. during the leb time (t leb ), the spike is disregarded. 8.3.3 overcurrent protection (ocp) the SSL21081T contain a highly accurate built-in peak current detector. it triggers when the voltage at the source pin reaches the peak-level v th(ocp)source . the current through the switch is sensed using a resistor connected to the source pin. the sense circuit is activated following leb time t leb . as the led current is half the peak current (by design), it automatically provides protection for maximum led current during operation. there is a propagation delay (t d(ocp-swoff) ) between the overcurrent detection and the actual switching off of the switch. due to the delay, the actual peak current is slightly higher than the ocp level set by the resistor in series to the source pin. 8.3.4 overtemperature protection (otp) when the internal otp function is triggered at a certain ic temperature (t th(act)otp ), the converter stops operating. the safe-restart prot ection is triggered and the ic restarts with switching resuming when the ic temperature drops lower than t th(rel)otp .
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 9 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 8.3.5 brownout protection brownout protection is designed to limit the lamp power when the input voltage drops close to the output voltage level. the input power has to remain constant. the input current would otherwise increase to a level that is too high for the input circuitry. for the SSL21081T, there is a maximum limit on the on-time t on( high) . the rate of cu rrent rise in the coil during the on-phase is proportional to the difference between input voltage and output voltage. therefore, the peak current cannot be reached before t on (high) . as a result the average output current to the leds is reduced. 8.3.6 short-winding protection (swp) swp activates if there is a steep rising curr ent through the mosfet and thus through the external resistor connected to the source pin. this current can occur when there is a short from the freewheel diode. additionally, it occurs due to a small/shorted inductor between the input voltage an d the drain pin. if the vo ltage on the source pin is > 1.5 v, latched protection is triggered following leb time t leb . in addition, if v cc drops to below v cc(rst) the ic resets the la tched protection mode. 8.3.7 output short-circuit protection (osp) during the secondary stroke (swit ch-off time), if a valley is not detected within the off-time limit (t off(high) ), then typically the output voltage is less than the minimum limit allowed in the application. this condition can occur either during start-up or due to a short-circuit. a timer t det(sc) is started when t off(high) is detected. timer t det(sc) is reset when a valid valley detection occurs in one of the subsequent cycles or when v cc drops to below v cc(stop) . the timer can also be reset if the maximu m limit on the on-time of the switch (t on(high) ) is reached, which is usually the case at start-up (brownout protection). if no valley is detected and (t on(high) ) is not reached before t det(sc) , then it is concluded that a real short-circuit exists. the ic enters latched protection. if v cc drops to below v cc(rst) , the ic resets the latched protection mode (see figure 5 ). fig 5. osp logic diagram ddd 9$//(< '(7(&7,21 7,0(5 w ghwvf 9 &&uvw w rqkljk 9 &&vwrs 64 5 w riikljk 6 263 4 5 ?
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 10 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 8.4 vcc supply the SSL21081T is supplied using three methods: ? under normal operation, the voltage swing on the dvdt pin is rectified within the ic providing current towards the vcc pin ? at start-up, there is an internal current source connected to the hv pin. the current source provides internal power until either the dv/dt supply or an external current on the vcc pin provides the supply ? using an auxiliary winding, the voltage can be rectified and connected to the vcc pin via a series resistor. the ic starts up when the volt a ge at the vcc pin exceeds v cc(startup) . the ic locks out (stops switching) when the voltage at the vcc pin is < v cc(stop) . the hysteresis between the start and stop levels allows the ic to be supplied by a buffer capacitor until the dv/dt supply is settled. the SSL21081T has an internal v cc clamp, which is an internal active zener (or shunt regulator). this internal active zener limits the voltage on the supply vcc pin to the maximum value of v cc . if the maximum current of the dv/dt supply minus the current consumption of the ic (determined by the load on the gate drivers), is lower than the maximum value of i dd no external zener diode is required in the dv/dt supply circuit. 8.5 dvdt pin supply (dv/dt) the dvdt pin is connected to an internal sing le-sided rectification stage. when a different voltage with sufficient amplitude is supplied to the pin, the ic can be powered without any other external power connection. this provides an effective method to prevent additional high power losses, which are the result if a r egulator were used for continuously powering the ic. unlike an auxiliary supply, addit ional inductor winding s are not required. 8.6 vcc regulator during supply dips, the input voltage can drop so much that it can no longer supply the required ic current through the dvdt pin. under these conditions, if the vcc voltage drops to below v cc(swon)reg level, another regulator with a current capability of up to i sup(high)hv is started. the job of the regulator is to fill in the r equired supply current, which the dv/dt supply does not deliver, thus prev enting that the ic enters uvlo. when the vcc voltage exceeds the v cc(swon)reg level, the regulator is turned off. 8.7 ntc functionality and pwm regulation the ntc pin can be used as a control method for led thermal protection. alternatively, the pin can be used as an input to disable/enab le light output using a digital signal (pwm regulation). the pin has an internal current source that generates the current of i offset(ntc) . an ntc resistor to monitor the led temperature can be connected directly to the ntc pin. depending on the resistance value and the corresponding voltage on the ntc pin, the converter reacts as shown in figure 6 . during start-up, before v cc reaches v cc(startup) the voltage on the ntc pin must be less than the minimum value of v act(tmr)ntc . this is valid when the voltage on the ntc pin is derived from the v cc using a resistive divider and a ptc in series with the resistor between pins vcc and ntc.
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 11 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic if an ntc resistor is connected between the ntc pin and ground, the voltage on the ntc pin is 0 v when v cc reaches v cc(startup) . when the voltage on the ntc pin exceeds v th(high)ntc (see figure 6 (4)), the converter delivers nominal output current. when the voltage is lower than this le vel, the peak current is gradually reduced until v th(low)ntc is reached (see figure 6 (3)). the peak current is now half the peak current of nominal operation. when v act(tmr)ntc is passed (see figure 6 (2)), a timer starts to run to distinguish between the following situations: ? if the low-level v deact(tmr)ntc is not reached within time t to(deact)ntc (see figure 6 (1)), led overtemperature is detected. the ic stops switching and attempts to restart from the hv p in voltage. the converter restarts from an ntc protection shutdown when the voltage on the ntc pin exceeds v th(high)ntc (see figure 6 (4)). it is assumed that the reduction in peak current does not result in a lower ntc temperature and led otp is activated. ? if the low-level v deact(tmr)ntc is reached within the time t to(deact)ntc (see figure 6 (1)) it is assumed that the pin is pulled down extern ally. t he restart function is not triggered. instead, the output current is reduced to zero. pwm regulation and consequently led output current regulation can be implemented this way. the output current rises again when the voltage exceeds v th(low)ntc . 8.7.1 soft-start function the ntc pin can be used to make a soft start function. during switch-on, the level on the ntc pin is low. by connecting a capacitor (in parallel with the ntc resistor), a time constant can be defined. the time constant causes the level on the ntc pin to increase slowly. when passing level v th(low)ntc (see figure 6 (3)), the converter starts with half of the maximum current. the output current slowly increases to maximum when v th(high)ntc (see figure 6 (4)) is reached. fig 6. ntc control curve ddq , sn 3hdnfxuuhqw , sn 9 wkrfs6285&( p9 9 wkrfs6285&( p9 9 17& 9 w k k lj k 1 7 & 9 w k or z 1 7 & 9 d f w w p u 1 7 & 9 g h d f w w p u 1 7 &
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 12 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 8.8 heat sink the copper of the pcb acts as the he at sink for SSL21081T applications. equation 1 shows the relation between the maxi mum allowable power dissipation p and the thermal resistance from junction to ambient. (1) where: r th(j-a) = thermal resistance from junction to ambient t j (max) = maximum junction temperature t amb = ambient temperature p = power dissipation r th j a ? ?? t jmax ?? t amb ? ?? p ? =
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 13 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 9. limiting values [1] the current into the vcc pin must not exceed the maximum i dd value. [2] an internal clamp sets the supply voltage. [3] human body model: equivalent to discharging a 100 pf capacitor through a 1.5 k ? s eries resistor. [4] charged device model: equivalent to charging the ic up to 1 kv and the subsequent discharging of each pin down to 0 v over a 1 ? ? r esistor. 10. thermal characteristics table 5. limiting values in accordance with the absolute maximum rating system (iec 60134). symbol parameter conditions min max unit general sr slew rate on pin drain ? 5 +5 v/ns p tot total power dissipation so8 package - 0.6 w t amb ambient temperature ? 40 +125 ?c t j junction temperature ? 40 +150 ?c t stg storage temperature ? 55 +150 ?c voltages v cc supply voltage continuous [1] ? 0.4 +20 v v drain voltage on pin drain ? 0.4 +300 v v hv voltage on pin hv current limited ? 0.4 +300 v v source voltage on pin source current limited ? 0.4 +5.2 v v ntc voltage on pin ntc current limited ? 0.4 +5.2 v currents i dd supply current at pin vcc [2] - 20 ma i drain current on pin drain ? 2 +2 a i source current on pin source ? 2 +2 a i dvdt current on pin dvdt duration 20 ? s maximum - 1.3 a v esd electrostatic discharge voltage human body model; pins drain and hv [3] ? 1 +1 kv human body model; al l oth er pins ? 2 +2 kv charged device [4] ? 500 +500 v table 6. thermal characteristics symbol parameter conditions typ unit r th(j-a) thermal resistance from junction to ambient in free air; so8 package, pcb: 2 cm ? ? 3 cm, 2-layer , 35 ? m cu per layer 142 k/w in free air; so8 package; pcb: jedec 2s2p 72 k/w ? j-top thermal characterization parameter from junction to top of package top package temperatur e measured at the warmest point on top of the case; so8 package 3.4 k/w
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 14 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 11. characteristics table 7. characteristics values specified at t amb = 25 ? c unless otherwise stated; all voltages are me asured with respect to ground; currents are positive. when flowing into the ic. symbol parameter conditions min typ max unit f conv conversion frequency - 100 - khz high-voltage i leak(drain) leakage current on pin drain v drain = 300 v (dc) - - 10 ? a i leak(hv) leakage current on pin hv v hv = 300 v (dc) - - 30 ? a supply v cc supply voltage operating range [1] 8 - 16 v v cc(startup) start-up supply voltage 11 12 13 v v cc(stop) stop supply voltage 8 9 10 v v cc(hys) hysteresis of supply voltage between v cc(startup) and v cc(stop) 2 - - v v cc(rst) reset supply voltage 4.5 5 5.5 v v cc(swon)reg regulator switch-on supply voltage insufficient dv/dt supply 8.75 9.25 9.75 v v cc(swoff)reg regulator switch-off supply voltage insufficient dv/dt supply 9.5 10 10.5 v v cc(reg)hys regulator supply voltage hysteresis v cc( swoff)reg ? v cc(swon)reg 0.3 - - v v cc(regswon-stop) supply voltage difference between regulator switch-on and stop v cc(swon)reg ? v cc(stop) 0.3 - - v consumption i stb(hv) standby current on pin hv during start-up or in protection; v hv = 100 v 300 350 400 ? a i cc supply current normal operation - 1.3 - ma capability i sup(high)hv high supply current on pin hv standby: v hv = 40 v; v cc < v cc(stop) 1 1.3 1.6 ma regulator on: v hv = 40 v; v cc < v cc(swon)reg after start-up 2 2.3 2.6 ma current and swp protection v th(ocp)source overcurrent protection threshold voltage on pin source ? v/ ? t = 0.1 v/ ? s 480 500 520 mv ? v/ ? t = 0.1 v/ ? s; v ntc = 0.325 v 230 250 270 mv t d(ocp-swoff) delay time from overcurrent protection to switch-off ? v/ ? t = 0.1 v/ ? s - 75 100 ns t leb leading edge blanking time overcurrent protection 260 300 340 ns short-winding protection 210 250 290 ns ? t leb leading edge blanking time difference between t leb for overcurrent protection and short-winding protection 30 50 - ns v th(swp)source short-winding protection threshold voltage on pin source 1.4 1.5 1.6 v
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 15 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic [1] an internal clamp sets the supply voltage. the curr ent into the vcc pin must not exceed the maximum i dd value (see table 5 ). [2] this parameter is not tested during production, by design it is guaranteed. valley detection (? v/ ? t) vrec valley recognition voltage change with time on pin drain ? 30 ? 20 ? 10 v/ ? s f ring ringing frequency [2] 200 550 1000 khz ? v vrec(min) minimum valley recognition voltage difference voltage drop on pin drain 15 20 25 v t d(vrec-swon) valley recognition to switch-on delay time - 100 - ns brownout detection t on(high) high on-time 12.5 15 17.5 ? s mosfet output stage v br(drain) breakdown voltage on pin drain t j > 0 ?c 300 - - v r dson drain-source on-state resistance t j = 25 ?c 2.05 2.3 2.55 ? t j = 125 ?c 3.05 3.45 3.85 ? ?dv/ dt) f(drain) fall rate of change of voltage on pin drain c drain = 150 pf, r source = 2.2 ? [2] - 1.2 - v/ns ntc functionality v th(high)ntc high threshold voltage on pin ntc 0.47 0.5 0.53 v v th(low)ntc low threshold voltage on pin ntc 0.325 0.35 0.375 v v act(tmr)ntc timer activation voltage on pin ntc 0.26 0.29 0.325 v v deact(tmr)ntc timer deactivation voltage on pin ntc 0.17 0.2 0.23 v t to(deact)ntc deactivation time-out time on pin ntc 33 46 59 ? s i offset(ntc) offset current on pin ntc - ? 47 - ? a osp t det(sc) short-circuit detection time 16 20 24 ms t off(high) high off-time 30 36 42 ? s temperature protections t th(act)otp overtemperature protection activation threshold temperature 160 170 180 ?c t th(rel)otp overtemperature protection release threshold temperature 90 100 110 ?c table 7. characteristics ?continued values specified at t amb = 25 ? c unless otherwise stated; all voltages are me asured with respect to ground; currents are positive. when flowing into the ic. symbol parameter conditions min typ max unit
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 16 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 12. SSL21081T buck configuration fig 7. buck configuration for SSL21081T ddq 57 17& & & ' ' & & & 5 / ,& ixvh / 1 5*1' wr pdlqv +9 '5$,1 6285&( 5*1' *1' 9&& *1' 17& '9'7 ,& /(' q /(' /(' & ' /
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 17 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 13. package outline fig 8. package outline sot96-1 (sot8) unit a max. a 1 a 2 a 3 b p cd (1) e (2) (1) eh e ll p qz ywv references outline version european projection issue date iec jedec jeita mm inches 1.75 0.25 0.10 1.45 1.25 0.25 0.49 0.36 0.25 0.19 5.0 4.8 4.0 3.8 1.27 6.2 5.8 1.05 0.7 0.6 0.7 0.3 8 0 o o 0.25 0.1 0.25 dimensions (inch dimensions are derived from the original mm dimensions) notes 1. plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included. 2. plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included. 1.0 0.4 sot96-1 x w m a a 1 a 2 b p d h e l p q detail x e z e c l v m a (a ) 3 a 4 5 pin 1 index 1 8 y 076e03 ms-012 0.069 0.010 0.004 0.057 0.049 0.01 0.019 0.014 0.0100 0.0075 0.20 0.19 0.16 0.15 0.05 0.244 0.228 0.028 0.024 0.028 0.012 0.01 0.01 0.041 0.004 0.039 0.016 0 2.5 5 mm scale so8: plastic small outline package; 8 leads; body width 3.9 mm sot96-1 99-12-27 03-02-18
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 18 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 14. abbreviations 15. references [1] an11041 ? ssl21081, ssl21083, and ssl2109 non-dimmable buck converter in low ripple c onfigurations [2] an11263 ? 230 v (ac) mains dimmable led driver using the ssl2129at or ssl 210 84at table 8. abbreviations acronym description bcm boundary conduction mode bom bill of materials led light emitting diode leb leading-edge blanking mosfet metal-oxide semiconductor field-effect transistor ocp overcurrent protection osp output short protection otp overtemperature protection pcb printed-circuit board pwm pulse-width modulation swp short-winding protection uvlo undervoltage lockout zcs zero current switching
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 19 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 16. revision history table 9. revision history document id release date data sheet status change notice supersedes SSL21081T v.6 20131003 product data sheet - ssl21081_ssl21083 v.5 modifications: ? text and graphics have been updated throughout the data sheet. ssl21081_ssl21083 v.5 20121011 product data sheet - ssl2108_ser v.4 ssl2108_ser v.4 20120508 product data sheet - SSL21081T_2t_3t_4t v.3.1 SSL21081T_2t_3t_4t v.3.1 20120222 product data sheet - SSL21081T_2t_3t_4t v.3 SSL21081T_2t_3t_4t v.3 20120214 product data sheet - SSL21081T_2t_3t_4t v.2 SSL21081T_2t_3t_4t v.2 20111206 preliminary data sheet - ssl2108x v.1 ssl2108x v.1 20110909 preliminary data sheet - -
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 20 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic 17. legal information 17.1 data sheet status [1] please consult the most recently issued document before initiating or completing a design. [2] the term ?short data sheet? is explained in section ?definitions?. [3] the product status of device(s) described in this document may have changed since this document was published and may differ in case of mu ltiple device s. the latest product status information is available on the internet at url http://www.nxp.com . 17.2 definitions draft ? the document is a draft versi on only . the content is still under internal review and subject to formal approval, which may result in modifications or additions. nxp semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall hav e no liability for the consequences of use of such information. short data sheet ? a short data sheet is an extract from a full data sheet wit h the same product type number(s) and title. a short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. for detailed and full information see the relevant full data sheet, which is available on request vi a the local nxp semiconductors sales office. in case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. product specification ? the information and data provided in a product dat a sheet shall define the specification of the product as agreed between nxp semiconductors and its customer , unless nxp semiconductors and customer have explicitly agreed otherwis e in writing. in no event however, shall an agreement be valid in which the nxp semiconductors product is deemed to offer functions and qualities beyond those described in the product data sheet. 17.3 disclaimers limited warranty and liability ? information in this document is believed to be accurate and reliable. however, nxp semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such info rmation. nxp semiconductors takes no responsibility for the content in this document if provided by an information source outside of nxp semiconductors. in no event shall nxp semiconductors be lia ble fo r any indirect, incidental, punitive, special or consequential damages (including - without limitation - lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. notwithstanding any damages that customer might incur for any reason what soe ver, nxp semiconductors? aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the terms and conditions of commercial sale of nxp semiconductors. right to make changes ? nxp semiconductors reserves the right to make changes t o information published in this document, including without limitation specifications and product descriptions, at any time and without notice. this document supersedes and replaces all information supplied prior to the publication hereof. suitability for use ? nxp semiconductors products are not designed, aut hori zed or warranted to be suitable for use in life support, life-critical or safety-critical systems or equipment, nor in applications where failure or malfunction of an nxp semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. nxp semiconductors and its suppliers accept no liability for inclusion and/or use of nxp semiconducto rs products in such equipment or applications and therefore such inclusion and/or use is at the customer?s own risk. applications ? applications that are described herein for any of these prod uct s are for illustrative purpos es only. nxp semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. customers are responsible for the design and operation of their applications and pr oduct s using nxp semiconductors products, and nxp semiconductors accepts no liability for any assistance with applications or customer product design. it is customer?s sole responsibility to determine whether the nxp semiconductors product is suitable and fit for the customer?s applications and products planned, as well as fo r the planned application and use of customer?s third party customer(s). customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. nxp semiconductors does not accept any liabil i ty related to any default, damage, costs or problem which is based on any weakness or default in the customer?s applications or products, or the application or use by customer?s third party customer(s). customer is responsible for doing all necessary testing for the customer?s applic ations and products using nxp semiconductors products in order to av oid a default of the applications and the products or of the application or use by customer?s third party customer(s). nxp does not accept any liability in this respect. limiting values ? stress above one or more limiting values (as defined in th e absolute maximum ratings system of iec 60134) will cause permanent damag e to the device. limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above those given in the recommended operating conditions section (if present) or the characteristics sections of this document is not warranted. constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. terms and conditions of commercial sale ? nxp semiconductors prod uct s are sold subject to the gener al terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms , unless otherwise agreed in a valid written individual agreement. in case an individual agre ement is concluded only the terms and conditions of the respective agreement shall apply. nxp semiconductors hereby expressly objects to applying the customer?s general terms and conditions with regard to the purchase of nxp semiconducto rs products by customer. no offer to sell or license ? nothing in this document may be interpreted or co nstr ued as an offer to sell products t hat is open for acceptance or the grant, conveyance or implication of any lic ense under any copyrights, patents or other industrial or intellectual property rights. document status [1] [2] product status [3] definition objective [short] data sheet development this document contains data from the objec tive specif icati on for product development. preliminary [short] data sheet qualification this document contains data from t he preliminary specification. product [short] data sheet production this document contains the product specification.
SSL21081T all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2013. all rights reserved. product data sheet rev. 6 ? 3 october 2013 21 of 22 nxp semiconductors SSL21081T compact non-dimmable led driver ic export control ? this document as well as the item(s) described herein may b e subject to export control regu lations. export might require a prior authorization from competent authorities. quick reference data ? the quick reference data is an extract of the pro duct dat a given in the limiting values and characteristics sections of this document, and as such is not comple te, exhaustive or legally binding. non-automotive qualified products ? unless this data sheet expressly st at es that this specific nxp semicon ductors product is automotive qualified, the product is not suitable for automotive use. it is neither qualified nor tested in accordance with automotive testing or application requirements. nxp semiconductors accepts no liabili ty for inclusion and/or use of non-automotive qualified products in automotive equipment or applications. in the event that customer uses t he pro duct for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall use the product without nxp semiconductors? warranty of the product for such automotive applicat ions, use and specifications, and (b) whenever customer uses the product for automotive applications beyond nxp semiconductors? specifications such use shall be solely at customer?s own risk, and (c) customer fully indemnifies nxp semiconductors for any liability, damages or failed product claims resulting from customer design and use of the product for automotive app lications beyond nxp semiconductors? standard warranty and nxp semiconduct ors? product specifications. translations ? a non-english (translated) version of a document is for ref e rence only. the english version shall prevail in case of any discrepancy between the translated and english versions. 17.4 trademarks notice: all referenced brands, produc t names, service names and trademarks are the property of their respective owners. greenchip ? is a trademark of nxp b.v. 18. contact information for more information, please visit: http://www.nxp.com for sales office addresses, please send an email to: salesaddresses@nxp.com
nxp semiconductors SSL21081T compact non-dimmable led driver ic ? nxp b.v. 2013. all rights reserved. for more information, please visit: http://www.nxp.com ? for sales office addresses, please se nd an email to: salesaddresses@nxp.com date of release: 3 october 2013 document identifier: SSL21081T please be aware that important notices concerning this document and the product(s) described herein, have been included in section ?legal information?. 19. contents 1 general description . . . . . . . . . . . . . . . . . . . . . . 1 2 features and benefits . . . . . . . . . . . . . . . . . . . . 1 3 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 quick reference data . . . . . . . . . . . . . . . . . . . . . 3 5 ordering information . . . . . . . . . . . . . . . . . . . . . 3 5.1 ordering options . . . . . . . . . . . . . . . . . . . . . . . . 3 6 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 4 7 pinning information . . . . . . . . . . . . . . . . . . . . . . 5 7.1 pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 7.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5 8 functional description . . . . . . . . . . . . . . . . . . . 6 8.1 converter operation . . . . . . . . . . . . . . . . . . . . . 6 8.2 valley detection. . . . . . . . . . . . . . . . . . . . . . . . . 7 8.3 protective features . . . . . . . . . . . . . . . . . . . . . . 8 8.3.1 undervoltage lockout (uvlo) . . . . . . . . . . . . 8 8.3.2 leading-edge blanking (leb) . . . . . . . . . . . . . 8 8.3.3 overcurrent protection (ocp) . . . . . . . . . . . . . 8 8.3.4 overtemperature protection (ot p) . . . . . . . . . 8 8.3.5 brownout protection . . . . . . . . . . . . . . . . . . . . . 9 8.3.6 short-winding protection (swp) . . . . . . . . . . . 9 8.3.7 output short-ci r c uit protection (osp). . . . . . . . 9 8.4 vcc supply. . . . . . . . . . . . . . . . . . . . . . . . . . . 10 8.5 dvdt pin supply (dv/dt) . . . . . . . . . . . . . . . . . 10 8.6 vcc regulator . . . . . . . . . . . . . . . . . . . . . . . . . 10 8.7 ntc functionality and pwm regulation. . . . . . 10 8.7.1 soft-start function . . . . . . . . . . . . . . . . . . . . . . 11 8.8 heat sink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 9 limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 13 10 thermal characteristics . . . . . . . . . . . . . . . . . 13 11 characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 14 12 SSL21081T buck configuration . . . . . . . . . . . 16 13 package outline . . . . . . . . . . . . . . . . . . . . . . . . 17 14 abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 18 15 references . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 16 revision history . . . . . . . . . . . . . . . . . . . . . . . . 19 17 legal information. . . . . . . . . . . . . . . . . . . . . . . 20 17.1 data sheet status . . . . . . . . . . . . . . . . . . . . . . 20 17.2 definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 17.3 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 17.4 trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 21 18 contact information. . . . . . . . . . . . . . . . . . . . . 21 19 contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

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