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| 1. general description the TEA1731LTS is a low co st switched mode power supply (smps) controller ic intended for flyback topologies. the TEA1731LTS operates in peak current and frequency control mode. frequency jitter has been implemented to reduce electromagnetic interference (emi). slope compensation is integrated for continuous conduction mode (ccm) operation. the TEA1731LTS ic features overpower pr otection (opp). the controller accepts an overpower situation for a limited amount of time. one pin is reserved for prot ection purposes. overtemperatur e protection (otp) can be implemented with a minimal number of external components. at low-power levels, the primary peak current is set to 25 % of the maximum peak current. the switching frequency is reduced to limit th e switching losses. the combination of fixed frequency operation at high output power an d frequency reduction at low output power provides high efficiency over the total load range. the TEA1731LTS makes the design of low cost, highly efficient and reliable supplies for power requirements up to 75 w easier by requiring a minimum number of external components. 2. features and benefits ? smps controller ic enablin g low-cost applications ? large input voltage range (12 v to 30 v) ? integrated overvoltage protection (ovp) on vcc ? very low supply current during start-up and restart (10 ? a typical) ? low supply current during normal operation (0.58 ma typical without load) ? internal overpower time-out ? overpower or high/low line compensation (nxp patent: 81421271ep01) ? fixed switching frequency with frequency jitter to reduce emi ? frequency reduction at medium power operation to maintain high efficiency ? frequency reduction with fixed minimum peak current to maintain high efficiency at low output power levels ? frequency increase at peak power operation ? slope compensation for ccm operation ? adjustable soft start ? low and adjustable overcurrent protection (ocp) trip level TEA1731LTS greenchip smps control ic rev. 2 ? 16 august 2012 product data sheet
TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 2 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic ? protection input (for external otp and external ovp) ? ic overtemperature protection 3. applications ? all applications that require an efficient and cost-effective power supply solution up to 75 w. 4. ordering information 5. block diagram table 1. ordering information type number package name description version TEA1731LTS tsop6 plastic surface-mounted package; 6 leads sot457 fig 1. TEA1731LTS block diagram ! " # $ $ % $ & % $ '() (*+ "#, ,- #" -, .,. #./ &" (0 1 2 +3 &. - '() '() $ 45 *6 '5 (* $ $ - ,- /+ 2 +3 2 +3 -..7 !.7 ' 6 ) 1 8 $ 9 ) ' ) 1 : 7 ; : 7 ; : 7 ; : 7 ; % $ 1 <'1* 1 ",7 : 7 ; % $ (0 1 ) ' $ % $ (*+ 1 <'1* .,9. TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 3 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic 6. pinning information 6.1 pinning 6.2 pin description fig 2. TEA1731LTS pin configuration # " & ! $ $ - table 2. pin description symbol pin description vcc 1 supply voltage gnd 2 ground protect 3 general-purpose protection input ctrl 4 control input isense 5 current sense input driver 6 gate driver output TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 4 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic 7. functional description 7.1 general control the TEA1731LTS contains a controller for a flyback circuit. a typical configuration is shown in figure 3 . 7.2 start-up and undervoltage lockout (uvlo) initially, the capacitor on the vcc pin, c3, is charged from the high-voltage mains via resistor r1. as long as vcc is below v startup , the ic current consumption is low (10 ? a typical). when vcc reaches v startup , the ic first waits for the protect pin to reach the v det(protect)(l) voltage. when v det(protect)(l) is reached, the ic char ges the isense pin to the v start(soft) level and then starts switching. in a typical application, the auxiliary winding of the transformer takes over the supply voltage (see figure 4 ). if a protection is triggered, the controller st ops switching. depending on the protection triggered, it either causes a restart or latches the converter to an off-state. a restart protection disables the switching of the ic. the supply voltage of the ic drops to the uvlo level. when the uvlo level is re ached, the ic switches to power-down mode, where it consumes a low supply current (10 ? a typical). the switching recommences when the vcc capacitor is recharged to v startup via r1. when a latched protection is triggered, the TEA1731LTS immediately enters power-down mode. the vcc pin is clamped to a voltage ju st above the latch protection reset voltage (v rst(latch) +0.9v). fig 3. TEA1731LTS typical configuration " $ $ & #! - # # & - & # $# " # " # =# " ! - # / & TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 5 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic when the voltage on pin vcc drops below the v th(uvlo) level during normal operation, the controller stops switching. a vcc undervoltage, which does not occur during a start-up event, latches the ic in an off-state. 7.3 supply management all internal reference voltages are derived from a temperature compensated on-chip band gap circuit. internal reference currents are derived from a trimmed and temperature compensated current reference circuit. 7.4 overvoltage protection (pin vcc) an overvoltage protection (ovp) circuit is connected to the vcc pin. when the v cc exceeds v th(ovp) (30 v typical) for four consecutive switching cycles, the ic triggers the latched protection. when vcc drops below v th(ovp) before count = 4 is reached, the counter is reset to zero. if a lower over voltage protection level is needed, a zener diode can be connected between pins vcc and protect. 7.5 protection input (pin protect) pin protect is a general-purpose input pin, which can be used to switch off the converter (latched protection). the converter is stopped when the voltage on this pin is pulled above v det(h)(protect) (0.8 v typical) or below v det(l)(protect) (0.5 v typical) for four consecutive converter strokes. a current of 32 ? a (typical) flows out of the chip when the pin voltage is v det(l)(protect) . a current of 107 ? a (typical.) flows into the chip when the pin voltage is v det(h)(protect) . the protect input can be used for creating an (additional) overvoltage detection and an external overtemperatur e protection (otp) function. fig 4. start-up sequence, normal operation and latched protection (*0 *) 0(*0 ( *7 (* $ $ 5 5 ' 5 5 ) 0 ' (* 5 2 3 ' 2>32 3 ' 232 3 7 ;(757 ' ) 1 (7 <5 7 2 3 TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 6 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic a small capacitor can be connected to the pin if the protections on this pin are not used. an internal clamp of 4.1 v (typical) pr otects this pin from excessive voltages. 7.6 duty cycle control (pin ctrl) pin ctrl regulates the output power of the converter. this pin is connected to an internal voltage source of 5.4 v via an inter nal resistor (typical resistance: 7 k ? ). the ctrl pin voltage sets the peak current which is measured using the isense pin (see section 7.9 ). at low and medium output power the switching frequency is reduced (see section 7.11 ). the maximum duty cycle is limited to 80 % (typical). after eight consecutive converter strokes at ma ximum duty cycle the re start protection is activated. in a restart, the vcc capacitor is quickly discharged to the v th(uvlo) level and recharged to the start-up level from the high-voltage mains, before switching recommences. this occurs when th e mains input voltage is removed. 7.7 slope compensation (pin ctrl) a slope compensation circuit is integrated fo r ccm. the slope compensation guarantees stable operation for duty cycles exceeding 50 %. 7.8 overpower timer a temporary overload situ ation is allowed. if v ctrl(ipeak) (see figure 1 ) set by pin ctrl exceeds 400 mv, an internal timer is started. if the overload situation continues to exist for more than 60 ms (typical), an overpo wer protection (opp) is triggered (see figure 5 ). the TEA1731LTS enters latched protection when overload time-out is reached. fig 5. overpower delay <..#!?9 * * (7 $ $ 5 5 ) 0 -..7 (* (0 ' (0 ' *7 ' (7 <5 ) 5 5 ' TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 7 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic 7.9 current mode control (pin isense) current mode control is used bec ause it ensures a good line regulation. pin isense senses the primary cu rrent across an external resistor r6 and compares it with an internal control voltage. the internal control voltage is pro portional to the ctrl pin voltage (see figure 6 ). leading edge blanking prevents false trig gering due to capacitive discharge when switching on the external power switch (see figure 7 ). 7.10 soft start-up (pin isense) a soft start is made to prevent audible noise during start-up or restart. before the converter starts, soft start capacitor c4 on the isense pin is charged. when the converter starts switching, the primary peak current slowly increases when the soft start capacitor discharges through the soft start resistor (r5, see figure 3 ). the soft start capacitor (c4) and resistor (r5) values chosen set the soft start time constant. fig 6. peak current control fig 7. leading edge blanking t leb v sense(max) v isense t 014aaa932 TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 8 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic 7.11 peak power, high-power, medium power and low-power operation during high-power operation, with the converter running at a 65 khz (typical) fixed frequency, the power is controlled by varying the peak current. a peak-power mode is implemented to supply a short overload situation. in peak-power mode, both frequency and peak current are increased. at reduced power levels, the converter enters the medium-power mode where the peak current is reduced. the switching losses are reduced by lowering the switching frequency to 27.5 khz (typical). when the power is further reduced to low power, a second frequency reduction is made. in low-power operation, the switching frequen cy of the converter is reduced while the peak current is set to 25 % of the maximum peak current (see figure 6 and figure 8 ). 7.12 overpower or high/ low line compensation overpower compensation is built in to compensate for high/low line. the maximum continuous output power and the maximum peak power are about constant over the full mains input voltage range (see figure 9 ). the rectified mains in put voltage is measured by sensing the slope of the primary current from pin isense. the slope information is then used to adjust the primary current by subtracting an offset v (sense)offset from the internal control voltage v ctrl(ipeak) cycle-by-cycle (nxp patent: 81421271ep01). fig 8. frequency control 2 3 #,/#," &,# 7 '(57 1 (0 1 1 1 + 1 "/,+>@ !+>@ 9"+>@ ",- TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 9 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic 7.13 driver (pin driver) the driver circuit to the gate of the power mosfet has a current so urcing capability of typically 300 ma and a current sink capabilit y of typically 750 ma. this enables a fast turn-on and turn-off of the power mosfet for efficient operation. 7.14 overtemperature protection (otp) integrated overtemperature protection ensures that the ic stops switching if the junction temperature exceeds the thermal shutdown limit. otp is a latched protection. it can be reset by removing the voltage on pin vcc. fig 9. overpower compensation $ $ &9, ## 27 a3 ., .,- .,-. .,&&9 * 27 ;31( 7 * (* * 2 31( 7 * (* 2 3 TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 10 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic 8. limiting values [1] equivalent to discharging a 100 pf capacitor through a 1.5 k ? series resistor. 9. thermal characteristics table 3. limiting values in accordance with the absolute maximum rating system (iec 60134). symbol parameter conditions min max unit voltages v cc supply voltage continuous ? 0.4 +30 v t < 100 ms - 35 v v protect voltage on pin protect current limited ? 0.4 +5 v v ctrl voltage on pin ctrl ? 0.4 +5.5 v v isense voltage on pin isense current limited ? 0.4 +5 v currents i vcc current on pin vcc ? <10% - 0.4 a i i(protect) input current on pin protect ? 1+1ma i ctrl current on pin ctrl ? 30 ma i isense current on pin isense ? 10 +1 ma i driver current on pin driver ? <10% ? 0.4 +1 a general p tot total power dissipation t amb <75 ?c - 0.29 w t stg storage temperature ? 55 +150 ?c t j junction temperature ? 40 +150 ?c esd v esd electrostatic discharge voltage class 1 human body model [1] - 4000 v changed device model -750v table 4. thermal characteristics symbol parameter conditions typ unit r th(j-a) thermal resistance from junction to ambient in free air; single layer jedec test board 259 k/w r th(j-c) thermal resistance from junction to case in free air; jedec test board 152 k/w TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 11 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic 10. characteristics table 5. characteristics t amb =25 ? c; v cc = 20 v; all voltages are measured with respect to grou nd (pin 2); currents are positive when flowing into the ic; unless otherwise specified. symbol parameter conditions min typ max unit supply voltage management (pin vcc) v startup start-up voltage 19.3 21.5 23.8 v v th(uvlo) undervoltage lockout threshold voltage 11.2 12.5 13.8 v v th(ovp) overvoltage protection threshold voltage 29 30 31 v n cy(ovp) number of overvoltage protection cycles -4 - v clamp(vcc) clamp voltage on pin vcc activated during latched protection; i cc =100 ? a -v rst(latch) +0.9 - v activated during latched protection, i cc =1ma -- v rst(latch) +3.5 v i cc(restart) restart supply current 1 2.5 - ma v hys hysteresis voltage v startup -v th(uvlo) 6.6 9.1 11.6 v i cc(startup) start-up supply current v cc TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 13 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic [1] the clamp voltage on the protect pin is lowered when the ic is in power-down mode. (latched or restart protection) i sink(driver) sink current on pin driver v driver = 2 v 0.25 0.3 - a v driver =10v 0.6 0.75 - a v o(driver)max maximum output voltage on pin driver 910.5 12 v temperature protection t pl(ic) ic protection level temperature 130 140 150 ?c table 5. characteristics ?continued t amb =25 ? c; v cc = 20 v; all voltages are measured with respect to grou nd (pin 2); currents are positive when flowing into the ic; unless otherwise specified. symbol parameter conditions min typ max unit TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 14 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic 11. application information a power supply with the TEA1731LTS is a fl yback converter operating in continuous conduction mode. see figure 10 . capacitor c3 buffers the ic supply voltage, wh ich is powered via resistor r1 for start-up and via the auxiliary winding during normal operation. sens e resistor r6 converts the current through mosfet s1 into a voltage on pin isense. the value of resistor r6 defines the maximum primary peak current th rough mosfet s1. resistor r7 reduces the peak current to capacitor c3. resistor r5 and capacitor c4 define the soft start time. resistor r3 is added to prevent that soft start capacitor c4 from is charged during normal operation due to negative voltage spikes across current sense resistor r6. capacitor c2 is added to reduce noise on the ctrl pin. resistor r4 is requir ed to limit the current spikes to pin driver because of parasitic inductance of current sense re sistor r6. resistor r4 also dampens possible oscillations of mosfet s1. adding a bead on the gate pin of mosfet s1 can be required to prevent local oscillations of the mosfet. fig 10. TEA1731LTS application diagram aaa-002335 ic 2 isense driver gnd vcc protect ctrl 3 16 5 4 d1 c1 68 f r3 r4 d3 c5 t1 s1 r2 200 k o1 c2 1 nf o1 z1 d2 r6 0.25 c4 220 nf r5 22 k 1 k 10 r1 1 m r7 10 c3 4.7 f TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 15 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic 12. package outline fig 11. sot457 (tsop6) references outline version european projection issue date iec jedec jeita sot457 sc-74 wb m b p d e pin 1 index a a 1 l p q detail x h e e v m a a b y scale c x 13 2 4 5 6 0 1 2 mm plastic surface-mounted package (tsop6); 6 leads sot457 unit a 1 b p cd e h e l p qy wv mm 0.1 0.013 0.40 0.25 3.1 2.7 0.26 0.10 1.7 1.3 e 0.95 3.0 2.5 0.2 0.1 0.2 dimensions (mm are the original dimensions) 0.6 0.2 0.33 0.23 a 1.1 0.9 05-11-07 06-03-16 TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 16 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic 13. revision history table 6. revision history document id release date data sheet status change notice supersedes TEA1731LTS v.2.1 20120816 product data sheet - TEA1731LTS v.2 modifications: ? r4 value changed in figure 10 ? TEA1731LTS application diagram ? . TEA1731LTS v.2 20120731 product data sheet - TEA1731LTS v.1 TEA1731LTS v.1 20120206 objective data sheet - - TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 17 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic 14. legal information 14.1 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 multiple device s. the latest product status information is available on the internet at url http://www.nxp.com . 14.2 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 with 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 data 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. 14.3 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 liable for 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 whatsoever, 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 to 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, authorized 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 products 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 products 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 liability 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 the absolute maximum ratings system of iec 60134) will cause permanent damage 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 products 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 agreement 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 construed 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 objecti ve specification for product development. preliminary [short] data sheet qualification this document contains data from the preliminary specification. product [short] data sheet production this document contains the product specification. TEA1731LTS all information provided in this document is subject to legal disclaimers. ? nxp b.v. 2012. all rights reserved. product data sheet rev. 2 ? 16 august 2012 18 of 19 nxp semiconductors TEA1731LTS greenchip smps control ic export control ? this document as well as the item(s) described herein may be subject to export control regu lations. export might require a prior authorization from competent authorities. non-automotive qualified products ? unless this data sheet expressly states 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 product 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 reference only. the english version shall prevail in case of any discrepancy between the translated and english versions. 14.4 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. 15. 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 TEA1731LTS greenchip smps control ic ? nxp b.v. 2012. 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: 16 august 2012 document identifier: TEA1731LTS please be aware that important notices concerning this document and the product(s) described herein, have been included in section ?legal information?. 16. contents 1 general description . . . . . . . . . . . . . . . . . . . . . . 1 2 features and benefits . . . . . . . . . . . . . . . . . . . . 1 3 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 4 ordering information . . . . . . . . . . . . . . . . . . . . . 2 5 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2 6 pinning information . . . . . . . . . . . . . . . . . . . . . . 3 6.1 pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 6.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3 7 functional description . . . . . . . . . . . . . . . . . . . 4 7.1 general control . . . . . . . . . . . . . . . . . . . . . . . . . 4 7.2 start-up and undervoltage lockout (uvlo) . . 4 7.3 supply management. . . . . . . . . . . . . . . . . . . . . 5 7.4 overvoltage protection (pin vcc). . . . . . . . . . . 5 7.5 protection input (pin protect) . . . . . . . . . . . 5 7.6 duty cycle control (pin ctrl). . . . . . . . . . . . . . 6 7.7 slope compensation (pin ctrl). . . . . . . . . . . . 6 7.8 overpower timer . . . . . . . . . . . . . . . . . . . . . . . . 6 7.9 current mode control (pin isense) . . . . . . . . . 7 7.10 soft start-up (pin isense) . . . . . . . . . . . . . . . . 7 7.11 peak power, high-power, medium power and low-power operation . . . . . . . . . . . . . . . . . . . . . 8 7.12 overpower or high/low line compensation . . . . 8 7.13 driver (pin driver) . . . . . . . . . . . . . . . . . . . . . 9 7.14 overtemperature protection (otp) . . . . . . . . . 9 8 limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 10 9 thermal characteristics . . . . . . . . . . . . . . . . . 10 10 characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 11 11 application information. . . . . . . . . . . . . . . . . . 14 12 package outline . . . . . . . . . . . . . . . . . . . . . . . . 15 13 revision history . . . . . . . . . . . . . . . . . . . . . . . . 16 14 legal information. . . . . . . . . . . . . . . . . . . . . . . 17 14.1 data sheet status . . . . . . . . . . . . . . . . . . . . . . 17 14.2 definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 14.3 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 14.4 trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 18 15 contact information. . . . . . . . . . . . . . . . . . . . . 18 16 contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 |
Price & Availability of TEA1731LTS
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