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innovative power tm - 1 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. activepsr tm quasi-resonant pwm controller features ? patented primary side regulation technology ? quasi-resonant operation ? adjustable up to 120khz switching frequency ? +/-5% output voltage regulation ? constant power operation mode for fast start-up and motor drive applications ? integrated line and primary inductance compensation ? built-in soft-start circuit ? line under-voltage, thermal, output over- voltage, output short protections ? current sense resistor short protection ? transformer short winding protection ? less than 100mw standby power ? complies with global energy efficiency and cec average efficiency standards ? tiny sot23-6 packages applications ? ac/dc adaptors/chargers for e-shaver, motor driver, adsl, network power, cell phone ? big capacitive load application general description the ACT412 is a high performance peak current mode pwm controller which applies activepsr tm and activeqr tm technology. ACT412 achieves accurate voltage regulation without the need of an opto-coupler or reference device. the ACT412 is designed to achieve less than 100mw standby power. by applying frequency fold back and activeqr tm technology, ACT412 exceeds the latest es2.0 efficiency standard. ACT412 integrates comprehensive protection. in case of over temperature, over voltage, short winding, short current sense resistor, open loop and overload conditions, it would enter auto restart mode including cycle-by-cycle current limiting. ACT412 is to achieve no overshoot and very short rise time even with big capacitive load (10000f) with the built-in fast and soft start process, . the quasi-resonant (qr) operation mode can effectively improve efficiency, reduce the emi noise and further reduce the components in input filter. ACT412 is idea for application up to 36 watt. figure 1: simplified application circuit ACT412 rev 1, 30-oct-13
ACT412 rev 1, 30-oct-13 innovative power tm - 2 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. pin configuration pin descriptions part number temperature range package pins packing method top mark ACT412us-t -40c to 85c sot23-6 6 tube & reel frys ordering information pin name description 1 cs current sense pin. connect an external resistor (r cs ) between this pin and ground to set peak current limit for the primary switch. 2 gnd ground. 3 gate gate drive. gate driver fo r the external mosfet transistor. 4 vdd power supply. this pin provides bias power fo r the ic during startup an d steady state operation. 5 fb feedback pin. connect this pin to a resist or divider network from the auxiliary winding. 6 comp compensation pin. sot23-6 ACT412us
ACT412 rev 1, 30-oct-13 innovative power tm - 3 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. absolute maximum ratings c electrical characteristics (v dd = 18v, l m = 0.5mh, r cs = 0.75 ? , v out = 13v, n p = 68, n s =12, n a = 17, t a = 25c, unless otherwise specified,12v0.4a applica- tion) c : do not exceed these limits to prevent damage to the device. exposure to absolute maximum ra ting conditions fo r long periods. parameter value unit fb, cs, comp to gnd -0.3 to + 6 v vdd, gate to gnd -0.3 to + 22 v maximum power dissipation (sot23-6) 0.45 w operating junction temperature -40 to 150 ? c junction to ambient thermal resistance ( ja ) 220 ? c/w operating junction temperature -40 to 150 ? c storage temperature -55 to 150 ? c lead temperature (soldering, 10 sec) 300 ? c parameter symbol test conditions min typ max unit supply vdd turn-on voltage v ddon v dd rising from 0v 11.11 12.35 13.58 v vdd turn-off voltage v ddoff v dd falling after turn-on 4.8 5.4 6 v vdd over voltage protection v ddovp v dd rising from 0v 18.45 20.5 22.55 v start up supply current i ddst v dd = 11v, before vdd turn-on 5 10 a idd supply current i dd v dd = 12v, after vdd turn-on (no switching) 0.55 1 ma idd supply current at fault mode i dd v dd = 12v, after vdd turn-on, fault = 1 0.25 ma feedback effective fb reference voltage v fbref 2.23 2.25 2.28 v fb sampling blanking time t fb_blk light load 0.38 0.45 0.52 s heavy load 1.1 1.3 1.5 s time needed for fb sampling (after blanking) fb sampling 0.5 0.65 0.75 s cc and knee point detecti ng 0.22 0.25 0.29 s fb leakage current i bvfb v fb = 3v 1 a current limit cs current limit threshold v cslim1 v out = 12v 0.5 v v cslim2 v out = 6v 0.75 v cs minimum current limits threshold v csmin 300 mv cs to gate propagation delay 60 ns leading edge blanking time t csblank light load 150 ns heavy load 636 ns t fb_samp
ACT412 rev 1, 30-oct-13 innovative power tm - 4 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. parameter symbol test conditions min typ max unit gate drive gate rise time t rise vdd = 10v, cl = 1nf 150 250 ns gate falling time t fall vdd = 10v, cl = 1nf 90 ns gate low level on-resistance r onlo i sink = 30ma 10 ? gate high level on-resistance r onhi i source = 30ma 31 ? gate leakage current gate = 18v, before vdd turn-on 1 a compensation inside compensate resistor r comp ACT412 0 k ? output sink current i comp_sink v fb = 3v, v comp = 2v 15 40 a output source current i comp _ sour ce v fb = 1.5v, v comp = 2v 15 40 a transconductance of error amplifier gm 71 a/v maximum output voltage v compmax v fb = 1.5v 3.5 v minimum output voltage v compmin v fb = 3v 0.4 v cs to comp gain 2 v/v pre-amp gain 1 v/v comp leakage current comp = 2.5v 1 a oscillator maximum switching f max 108 120 132 khz maximum duty cycle d max 65 75 % minimum switching frequency f min 1164 hz electrical characteristics cont?d (v dd = 18v, l m = 0.5mh, r cs = 0.75 ? , v out = 13v, n p = 68, n s =12, n a = 17, t a = 25c, unless otherwise specified,12v0.4a applica- tion)
ACT412 rev 1, 30-oct-13 innovative power tm - 5 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. parameter symbol test conditions min typ max unit protection cs short waiting time 2 2.25 3 s cs short detection threshold 0.1 0.15 v cs open threshold voltage 1.75 v abnormal ocp blanking time 190 ns inductance short cs threshold voltage 1.75 v thermal shutdown temperature 135 ? c thermal hysteresis 20 ? c line uvlo i fbuvlo 0.2 ma line uvlo hysteresis 20 a line ovp i fbovp 2.4 ma valley detection valley detection time window v comp = 0.45v 3.3 s vo short detection threshold v fbuvlo 0.28 v vfb over voltage protection 3 v electrical characteristics cont?d (v dd = 18v, l m = 0.5mh, r cs = 0.75 ? , v out = 13v, n p = 68, n s =12, n a = 17, t a = 25c, unless otherwise specified,12v0.4a applica- tion)
ACT412 rev 1, 30-oct-13 innovative power tm - 6 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. functional block diagram
ACT412 rev 1, 30-oct-13 innovative power tm - 7 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. ACT412 is a high performance peak current mode low-voltage pwm controller ic. the controller includes the most advance features that are required in the adaptor applications up to 36 watt. unique fast startup, frequency fold back, qr switching technique, accurate olp, low standby mode operation, external compensation adjustment, short winding protection, ocp, otp, ovp and uvlo are included in the controller. startup startup current of ACT412 is designed to be very low so that vdd could be charged to v ddon threshold level and device starts up quickly. a large value startup resistor can therefore be used to minimize the power loss yet reliable startup in application. for a typical ac/dc adaptor with universal input range design, two 1m ? , 1/8 w startup resistors could be used together with a vdd capacitor(4.7uf) to provide a fast startup and yet low power dissipation design solution. during startup period, the ic begins to operate with minimum ippk to minimize the switching stresses for the main switch, output diode and transformers. and then, the ic operates at maximum power output to achieve fast rise time. after this, v out reaches about 90% v out , the ic operates with a ?soft-landing? mode (decrease ippk) to avoid output overshoot. constant voltage (cv) mode operation in constant voltage operation, the ACT412 senses the output voltage at fb pin through a resistor divider network r5 and r6 in figure 2. the signal at fb pin is pre-amplified against the internal reference voltage, and the secondary side output voltage is extracted based on active-semi's proprietary filter architecture. this error signal is then am plified by the internal error amplifier. when the secondary output voltage is above regulation, the error amplifier output voltage decreases to reduc e the switch current. when the secondary output voltage is below regulation, the error amplifier output voltage increases to ramp up the switch current to bring the secondary output back to regulation. the output regulation voltage is determined by the following relationship: where r fb1 (r5) and r fb2 (r6) are top and bottom feedback resistor, n s and n a are numbers of transformer secondary an d auxiliary turns, and v d is the rectifier diode forward drop voltage at approximately 0.1a bias. constant power (cp) mode operation when the secondary output current reaches a level set by the internal current limiting circuit, the ACT412 enters current limit condition and causes the secondary output volta ge to drop. as the output voltage decreases, so does the flyback voltage in a proportional manner. an internal current shaping circuitry adjusts the switching frequency and current limit threshold slowly based on the flyback voltage so that the transferred powe r is fixed to the output voltage, resulting in a constant power at secondary side output power profile. through correctly setting k1, k2, the energy transferred to the output during each switching cycle is ?(lp ilim^2) , where lp is the transformer primary inductance, ilim is the primary peak current, formula can be present as below: where f sw is the switching frequency. the constant power operation typically extends down to 20% of nominal output voltage regulation. standby (no load) mode in no load standby mode, the ACT412 oscillator frequency is further reduced to a minimum frequency while the current pulse is reduced to a minimum level to minimize standby power. the actual minimum switching frequency is programmable with an output preload resistor. loop compensation the ACT412 allows external loop compensation by connecting a capacitor to extend its applications, especially with different v out in a wide output power range. primary inductance compensation the ACT412 integrates a built-in primary inductance compensation circuit to maintain constant olp despite variations in transformer manufacturing. the compensated ranges is +/-7%. primary inductor current limit compensation the ACT412 integrates a primary inductor peak functional description (1) d a s 2 fb 1 fb outcv v n n ) r r 1 ( v 20 . 2 v - + = sw 2 2 th _ cs 1 p outcp f k ) v k ( l 2 1 p = (2)
ACT412 rev 1, 30-oct-13 innovative power tm - 8 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. current limit compensation circuit to achieve constant power over wide line and wide load range. frequency fold-back when the load drops to 75% of full load level, ACT412 starts to decrease the switching frequency, which is proportional to the load current ,to improve the efficiency of the converter as show in functional block diagram. this enables the application to meet all latest green energy standards. the actual minimum switching frequency is programmable with a small dummy load (while still meeting standby power). valley switching ACT412 employed valley switching from medium load to heavy load to reduce switching loss and emi. after the switch is turned off, the ringing voltage from the auxiliary winding is applied to the vfb pin through feedback network r5, r6. internally, the vfb pin is connected to an zero- crossing detector to generate the switch turn on signal when the conditions are met. in light load, the frequency fold back scheme starts to take control to determine the switch turn on signal, so thus the switching frequency. figure 1: valley switching at heavy load protection features the ACT412 provides full protection functions. the following table summarizes all protection functions. auto-restart operation ACT412 will enter auto-restart mode when a fault is identified. there is a startup phase in the auto- restart mode. after this startup phase the conditions are checked whether the failure is still present. normal operation proceeds once the failure mode is removed. otherwise, new startup phase will be initiated again. to reduce the power loss during fault mode, the startup delay control is implemented. the startup delay time increases over lines. short circuit protection when the secondary side output is short circuited, the ACT412 enters hiccup mode operation. this hiccup behavior continues until the short circuit is removed. fb over voltage protection the ACT412 includes output over-voltage protection circuitry, which shuts down the ic when the output voltage is 40% above the normal regulation voltage 4 consecutive switching cycles. the ACT412 enters hiccup mode when an output over voltage fault is detected. vdd over voltage protection ACT412 can monitor the converter output voltage. the voltage generated by the auxiliary winding tracks converter?s output voltage through vdd, which is in proportion to the turn ratio (v out +v diode ) n a /n s . when the v out is abnormally higher than design value for four consecutive cycles, ic will functional description cont?d vdrain_gnd mosfet t dc voltage t ton possible valley turn on protection functions failure condition protection mode v dd over voltage v dd > 20.5v (4 duty cycle) auto restart over temperature t > 135 ? c auto restart short winding/ short diode v cs > 1.75v auto restart over load ipk = i limit auto restart output short circuit v fb < 0.28v auto restart open loop no switching for 4 cycle auto restart v cc under voltage v cc < 6.8v auto restart vfb over voltage v fb > 3v (4 duty cycle) auto restart
ACT412 rev 1, 30-oct-13 innovative power tm - 9 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. enter the restart process. a counter is used to reduce sensitivity to noise and prevent the auto start unnecessary. open loop protection ACT412 is able to protect itself from damage when the control loop is open. the typical open loop condition includes either vfb floating or rfb5 open. over temperature shutdown the thermal shutdown circuitry detects the ACT412 die temperature. the threshold is set at typical 135 ? c. when the die temperature rises above this threshold (135 ? c) the ACT412 is disabled and remains disabled until the die temperature falls below 115 ? c, at which point the ACT412 is re- enabled. typical application cont?d
ACT412 rev 1, 30-oct-13 innovative power tm - 10 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. typical application cont?d design example the design example below gives the procedure for a dcm fly back converter using an ACT412. refer to application circuit figure 2, the design for an adapter application starts with the following specification: the operation for the circuit shown in figure 1 is as follows: the rectifier bridge d1-d4 and the capacitor c1/c2 convert the ac line voltage to dc. this voltage supplies the primary winding of the transformer t1 and the startup resistor r7/r8 to vdd pin of ACT412 and c4. the primary power current path is formed by the transformer?s primary winding, the mosfet, and the current sense resistor r9. the resistors r3, r2, diode d5 and capacitor c3 create a snubber clamping network that protects q1 from voltage spike from the transformer primary winding leakage inductance. the network consisting of capacitor c4, diode d6 and resistor r4 provides a vdd supply voltage for ACT412 from the auxiliary winding of the transformer. the resistor r4 is optional, which filt ers out spikes and noise to makes vdd more stable. c4 is the decoupling capacitor of the supply voltage and energy storage component for startup. during power startup, the current charges c4 through startup resistor r7/r8 from the rectified high voltage. the diode d8 and the capacitor c5/c6 rectify filter the output voltage. the resistor divider consists of r5 and r6 programs the output voltage. since a bridge rectifier and bulk input capacitors are used, the resulting minimum and maximum dc input voltages can be calculated: where ? is the estimated circuit efficiency, f l is the line frequency, t c is the estimated rectifier conduction time, c in is empirically selected to be 2 6.8f electrolytic capacitors. the full load system duty cycle is set to be 40% at low line voltage 85vac and the circuit efficiency is estimated to be 75%. then the average input current at full load is: the input primary peak current at full load: the primary inductance of the transformer: the primary turns on time at full load: the ringing periods from primary inductance with mosfet drain-source capacitor: design only an half ringing cycle at maximum load in minimum low line, so secondly reset time: base on conservation of energy and transformer transform identity, the primary to secondary turns ratio n p /n s : the auxiliary to secondary turns ratio n a /n s : v 90 f 8 . 6 2 75 . 0 ) ms 5 . 3 47 2 1 ( 5 2 85 2 c ) t f 2 1 ( p 2 v 2 v 2 in c l out 2 min _ inac min _ indc - - - = = (3) v 375 ) v 265 ( 2 v 2 v ac ac ) max ( in dc ) max ( in = = = (4) ma 375 4 . 0 75 2 d l 2 i fl fl _ n i fl _ ppk = = = (6) mh 74 . 0 k 130 ma 375 4 . 0 90 f i d v l s fl _ ppk fl min _ indc p = = (7) s 08 . 3 90 ma 375 mh 74 . 0 v i l t min _ indc fl _ ppk p fl _ on = = = (8) s 76 . 1 pf 100 %) 7 1 ( mh 73 . 0 14 . 3 2 c l 2 t max _ ds max _ p max _ ringing = + = = (9) s 73 . 3 s 76 . 1 5 . 0 s 08 . 3 khz 130 / 1 t 5 . 0 t t t max _ ringing fl _ on sw rst = = = - - - - (10) 53 . 5 45 . 0 13 90 73 . 3 08 . 3 v v v t t n n d out min _ in rst on s p = + = + = (11) 37 . 1 45 . 0 13 45 . 0 18 v v ' v v n n d out d dd s a = + + = + + = (12) ma 75 75 . 0 90 5 v p i min _ indc fl _ out fl _ in = = (5) input voltage range 90vac - 265vac, 50/60hz output power, p o 5w output voltage, v outcv 12v full load current, i outfl 0.4a cc current, i outmax 1.8a system efficiency cv, 0.75
ACT412 rev 1, 30-oct-13 innovative power tm - 11 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. typical application cont?d an ee16 core is selected for the transformer. from the manufacture?s catalogue recommendation, the core with an effective area a e is 19.2mm 2 .the turn of the primary winding is: the turns of secondary and auxiliary winding can be derived accordingly: determining the value of t he current sense resistor (r9) uses the peak current in the design. since the ACT412 internal current limit is set to 1v, the design of the current sense resistor is given by: the voltage feedback resistors are selected according to frequency at full load. the design frequency at full load is given by: the design vo is given by: where k is ic constant and k=0.0000065, then we can get the value: when selecting the output capacitor, a low esr electrolytic capacitor is recommended to minimize ripple from the current ripple. the approximate equation for the output capacitance value is given by: two 330f electrolytic capacitors are used to keep the ripple small. in fact, consider of transformer production, we scale down the turn ratio and inductance. pcb layout guideline good pcb layout is critical to have optimal performance. decoupling capacitor (c4) and feedback resistor (r5/r6) should be placed close to vdd and fb pin respectively. there are two main power path loops. one is formed by c1/c2, primary winding, mosfet transistor and current sense resistor (r9). the other is secondary winding, rectifier d8 and output capacitors (c5/c6). keep these loop areas as small as possible. connecting high current ground returns, the input capacitor ground lead, and the ACT412 gnd pin to a single point (star ground configuration). t 95 10 3000 2 . 19 00073 . 0 75 . 0 b a l i n 10 max e max _ p lim p = = ? (13) ma 750 ma 375 2 i 2 i fl _ p lim = = (14) t 24 17 4 . 1 n n n n t 17 53 . 5 / 95 n n / n n s s a a s p p s = = = = (15) . 3 . 1 75 . 0 1 i v r lim cs cs = = (16) sw _ f cs cs p d o 2 fb 1 fb 2 fb 1 fb s p s k r v l v v r r r r n n f + + = (17) d fb a s 2 fb 1 fb o v v n n ) r r 1 ( v ? + = (18) k 9 . 6 r , k 3 . 45 r 2 fb 1 fb = = (19) f 327 mv 50 k 110 8 . 1 v f i c ripple sw out out = = = (20) mh 5 . 0 l , t 17 n , t 12 n , t 68 n p a s p = = = = (21)
ACT412 rev 1, 30-oct-13 innovative power tm - 12 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. figure 2: ACT412, universal vac input, 12v/400ma output charger 4 2 0 6 8 10 12 14 16 output voltage (v) output current (ma) 0 300 600 900 1400 1200 9 0 v low limit high limit 264v 230v 1 1 5 v v-i characteristic vs. v in (25 ? c)
ACT412 rev 1, 30-oct-13 innovative power tm - 13 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. item reference description qty manufacturer 1 u1 ic, ACT412,sot23-6 1 active-semi. 2 c1,c2 capacitor, electrolyt ic, 6.8f/400v, 10x12mm 2 ksc 3 c3 capacitor, ceramic, 1000pf/500v, 0805,smd 1 poe 4 c4 capacitor, electrolyt ic,4.7f/35v,5x11mm 1 ksc 5 c5,c6 capacitor, electrolytic, 330f/16v, 8x11.5mm 2 ksc 6 c8 capacitor, ceramic, 0.1f/25v, 0805,smd 1 poe 7 c9 capacitor, ceramic, 1000pf/100v, 0805,smd 1 poe 8 c10 capacitor, ceramic, 200pf/50v, 0805,smd 1 poe 9 cy1 safety y1,capacitor,1000pf/400v,dip 1 uxt 10 d1-d4 diode,rectifier,1000v/1a,1n4007, do-41 4 good-ark 11 d5 fast recovery rectifier, rs1m,1000v/1.0a, rma 1 panjit 12 d6 fast recovery rectifie r,rs1d,200v/1.0a,sma 1 panjit 13 d7 nc 14 d8 diode, schottky, 100v/3a, sb3100, do-47 1 good-ark 15 l1 axial inductor, 1.5mh, 5*7,dip 1 soka 16 l2 axial inductor, 0.55*5t, 5*7,dip 1 soka 17 q1 mosfet transistor, 4n60,to-220 1 infineon 18 pcb1 pcb, l*w*t=52.2x30x 1.6mm,cem-1,rev:a 1 jintong 19 fr1 fuse,1a/250v 1 ty-ohm 20 r1 chip resistor, 51 ? , 0805, 5% 1 ty-ohm 21 r2 chip resistor, 510k ? , 1206, 5% 1 ty-ohm 22 r3 chip resistor, 100 ? , 0805, 5% 1 ty-ohm 23 r4,r13 chip resistor, 22 ? , 0805, 5% 2 ty-ohm 24 r5 chip resistor, 45.3k ? , 0805,1% 1 ty-ohm 25 r6 chip resistor, 6.9k ? , 0805, 1% 1 ty-ohm 26 r7,r8 chip resistor, 1.5m ? , 0805 , 5% 2 ty-ohm 27 r9 chip resistor, 0.75 ? , 1206,1% 1 ty-ohm 28 r11 chip resistor, 6.8k ? , 0805, 5% 1 ty-ohm 29 r12 chip resistor, 3k ? , 0805 , 5% 1 ty-ohm 30 r14 chip resistor, 390 ? , 0805 , 5% 1 ty-ohm 31 r15 chip resistor, 100k ? , 0805 , 5% 1 ty-ohm 32 t1 transformer, lp=0.5mh, ee16 1 table 2: ACT412 bill of materials
ACT412 rev 1, 30-oct-13 innovative power tm - 14 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. typical performanc e characteristics ACT412-001 vdd on/off voltage vs. temperature 13.5 12.5 11.5 10.5 9.5 8.5 7.5 6.5 v ddon and v ddoff (v) temperature (c) 0 40 120 80 -40 v ddoff ACT412-003 supply current at operation/fault mode vs. temperature supply current (ma) 0.5 0.4 0.3 0.2 0.6 ACT412-004 maximum/minimum switching frequency vs. temperature 100 50 0 150 maximum switching frequency (khz) ACT412-005 v cs voltage vs. temperature v cs voltage (v) 1.5 1 0.5 0 2 v ddon operation mode fault mode temperature (c) -40 0 40 80 120 temperature (c) -40 0 40 80 120 ACT412-002 startup supply current vs. temperature 5 4 3 6 7 8 startup supply current (a) temperature (c) -40 0 40 80 120 temperature (c) -40 0 40 80 120 f max f min v cs_open v cs voltage v cs_short ACT412-006 v fb threshold voltage vs. temperature v fb threshold voltage (v) 2.5 2 1.5 v ref temperature (c) -40 0 40 80 120
ACT412 rev 1, 30-oct-13 innovative power tm - 15 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. typical performanc e characteristics ACT412-007 v comp voltage vs. temperature 4 3 2 1 0 v ddon and v ddoff (v) temperature (c) 0 40 120 80 -40 v min v max
ACT412 rev 1, 30-oct-13 innovative power tm - 16 - www.active-semi.com copyright ? 2013 active-semi, inc. active-semi proprietary D for authorized recipients and customers activepsr tm is a trademark of active-semi. package outline sot23-6 package outline and dimensions active-semi, inc. reserves the right to modify the circuitr y or specifications without not ice. users should evaluate each product to make sure that it is suitable for their applications. active-semi products are not intended or authorized for use as critical components in life-support dev ices or systems. active-semi, inc. does not assume any liability arising out of the use of any product or circuit described in this datasheet, nor does it convey any patent license. active-semi and its logo are trademarks of active-semi, inc. for more information on this and other products, contact sales@active-semi.com or visit http://www.active-semi.com . is a registered trademark of active-semi.
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