to learn more about on semiconductor, please visit our website at www.onsemi.com please note: as part of the fairchild semiconductor integration, some of the fairchild orderable part numbers will need to change in order to meet on semiconductors system requirements. since the on semiconductor product management systems do not have the ability to manage part nomenclature that utilizes an underscore (_), the underscore (_) in the fairchild part numbers will be changed to a dash (-). this document may contain device numbers with an underscore (_). please check the on semiconductor website to verify the updated device numbers. the most current and up-to-date ordering information can be found at www.onsemi.com . please email any questions regarding the system integration to fairchild_questions@onsemi.com . is now part of on semiconductor and the on semiconductor logo are trademarks of semiconductor components industries, llc dba on semiconductor or its subsidiaries in the united states and/or other countries. on semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. a listing of on semiconductors product/patent coverage may be accessed at www.onsemi.com/site/pdf/patent-marking.pdf. on semiconductor reserves the right to make changes without further notice to any products herein. on semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does on semiconductor assume any liability arising out of the application or use of any product or circuit, and specifcally disclaims any and all liability, including without limitation special, consequential or incidental damages. buyer is responsible for its products and applications using on semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by on semiconductor. typical parameters which may be provided in on semiconductor data sheets and/or specifcations can and do vary in different applications and actual performance may vary over time. all operating parameters, including typicals must be validated for each customer application by customers technical experts. on semiconductor does not convey any license under its patent rights nor the rights of others. on semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any fda class 3 medical devices or medical devices with a same or similar classifcation in a foreign jurisdiction or any devices intended for implantation in the human body. should buyer purchase or use on semiconductor products for any such unintended or unauthorized application, buyer shall indemnify and hold on semiconductor and its offcers, employees, subsidiaries, affliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that on semiconductor was negligent regarding the design or manufacture of the part. on semiconductor is an equal opportunity/affrmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner.
?2002 fairchild semiconductor corporation www.fairchildsemi.com rev. 1.0.1 features ?5v 1% reference ? oscillator sync terminal ? internal soft start ? deadtime control ? under voltage lockout description the KA3525A is a monolithic integrated circuit that includes all of the control circuits necessary for a pulse width modulating regulator. there are a voltage reference, an error amplifier, a pulse width modulator, an oscillator, an under voltage lockout, a soft start circuit, and the output driver in the chip. 16-dip 1 internal block diagram 16 15 12 1 2 9 8 10 5 7 3 6 4 14 11 13 u.v.l.o. band gap ref 5v latch s r f/f q q 5k vc output a output b oscillator discharge 5k err amp pwm comp _ + _ + c t v ref v cc gnd ea(-) ea(+) eaout c (soft start) shut down sync r t osc output KA3525A smps controller
KA3525A 2 absolute maximum ratings electrical characteristics (v cc = 20v, t a = 0 to +70 c, unless otherwise specified) parameter symbol value unit supply voltage v cc 40 v collector supply voltage v c 40 v output current, sink or source i o 500 ma reference output current i ref 50 ma oscillator charging current i chg(osc) 5ma power dissipation (t a = 25 c) p d 1000 m/w operating temperature t opr 0 ~ +70 c storage temperature t stg -65 ~ +150 c lead temperature (soldering, 10sec) t lead +300 c parameter symbol conditions min. typ. max. unit reference section reference output voltage v ref t j = 25 c5.05.15.2v line regulation ? v ref v cc = 8 to 35v - 9 20 mv load regulation ? v ref i ref = 0 to 20ma - 20 50 mv short circuit output current i sc v ref = 0, t j = 25 c - 80 100 ma total output variation (note1) ? v ref line, load and temperature 4.95 - 5.25 v temperature stability (note1) st t - -2050mv long term stability (note1) st t j = 125 c ,1khr s -2050mv oscillator section initial accuracy (note1, 2) accur t j = 25 c- 3 6% frequency change with voltage ? f/ ? v cc v cc = 8 to 35v (note1, 2) - 0.8 2% maximum frequency f (max) r t = 2k ? , c t = 470pf 400 430 - khz minimum frequency f (min) r t = 200k ? , c t = 0.1uf - 60 120 hz clock amplitude (note1, 2) v (clk) - 34 - v clock width (note1, 2) t w(clk) t j = 25 c0.30.61 s sync threshold v th(sync) - 1.2 2 2.8 v sync input current i i(sync) sync = 3.5v - 1.3 2.5 ma
KA3525A 3 electrical characteristics (continued) (v cc = 20v, t a = 0 to +70 c, unless otherwise specified) note : 1. these parameters. although guaranteed over the recommended operating conditions, are not 100% tested in production 2. tested at f osc =40khz (r t =3.6k, c t =0.01uf, r i = 0 ? ) parameter symbol conditions min. typ. max. unit error amplifier section (v cm = 5.1v) input offset voltage v io - -1.510mv input bias current i bias - -110 a input offset current i io - -0.11 a open loop voltage gain g vo r l 10m ? 60 80 - db common mode rejection ratio cmrr v cm = 1.5 to 5.2v 60 90 - db power supply rejection ratio psrr v cc = 8 to 3.5v 50 60 - db pwm comparator section minimum duty cycle d (min) - --0% maximum duty cycle d (max) - 45 49 - % input threshold voltage (note2) v th1 zero duty cycle 0.7 0.9 - v input threshold voltage (note2) v th2 max duty cycle - 3.2 3.6 v soft-start section soft start current i soft v sd = 0v, v ss = 0v 25 51 80 a soft start low level voltage v sl v sd = 25v - 0.3 0.7 v shutdown threshold voltage v th(sd) - 0.9 1.3 1.7 v shutdown input current i n(sd) v sd = 2.5v - 0.3 1 ma output section low output voltage i v ol i i sink = 20ma - 0.1 0.4 v low output voltage ii v ol ii i sink = 100ma - 0.05 2 v high output voltage i v ch i i source = 20ma 18 19 - v high output voltage ii v ch ii i source = 100ma 17 18 - v under voltage lockout v uv v 8 and v 9 = high 678v collector leakage current i lkg v cc = 35v - 80 200 a rise time (note1) t r c l = 1uf, t j = 25 c - 80 600 ns fall time (note1) t f c l = 1uf, t j = 25 c - 70 300 ns standby current supply current i cc v cc = 35v - 12 20 ma
KA3525A 4 test circuit 16 15 12 1 2 9 8 10 5 7 13 11 14 36 band gap ref 5v u.v.l.o. a b 0.1 vcc 0.1 3k rwm adj 10k 1.5k 10k 0.01 5.0uf 5.0k 5.0k 5.0k 100 f/f err amp err amp oscillator latch s s r soft start + shutdown v ref c t ramp 0.009 0.1 + 3.6k 0.001 dead time out b 10k 10k out a v c clock _ + + _ r t
KA3525A 5 mechanical dimensions package #1 #8 #9 #16 6.40 0.20 7.62 0.300 2.54 0.100 0.252 0.008 0~15 0.25 +0.10 ?.05 0.010 +0.004 ?.002 3.30 0.30 0.130 0.012 3.25 0.20 0.128 0.008 19.40 0.20 0.764 0.008 19.80 0.780 max 5.08 0.200 0.38 0.014 max min 0.81 0.032 () 0.46 0.10 0.018 0.004 0.059 0.004 1.50 0.10 16-dip
KA3525A 10/2/02 0.0m 001 stock#dsxxxxxxxx ? 2002 fairchild semiconductor corporation life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. ordering information product number package operating temperature KA3525A 16-dip 0 ~ +70 c
www. onsemi.com 1 on semiconductor and are trademarks of semiconductor components industries, llc dba on semiconductor or its subsidiaries i n the united states and/or other countries. on semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property . a listing of on semiconductor?s product/patent coverage may be accessed at www.onsemi.com/site/pdf/patent ? marking.pdf . on semiconductor reserves the right to make changes without further notice to any products herein. on semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does o n semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including wi thout limitation special, consequential or incidental damages. buyer is responsible for its products and applications using on semiconductor products, including compliance with all laws, reg ulations and safety requirements or standards, regardless of any support or applications information provided by on semiconductor. ?typical? parameters which may be provided in on semiconductor data sheets and/or specifications can and do vary in dif ferent applications and actual performance may vary over time. all operating parameters, including ?typic als? must be validated for each customer application by customer?s technical experts. on semiconductor does not convey any license under its patent rights nor the right s of others. on semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any fda class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. should buyer purchase or use on semicondu ctor products for any such unintended or unauthorized application, buyer shall indemnify and hold on semiconductor and its officers, employees, subsidiaries, affiliates, and distrib utors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that on semiconductor was negligent regarding the design or manufacture of the part. on semiconductor is an equal opportunity/affirmative action employer. this literature is subject to all applicable copyright laws and is not for resale in any manner. publication ordering information n. american technical support : 800 ? 282 ? 9855 toll free usa/canada europe, middle east and africa technical support: phone: 421 33 790 2910 japan customer focus center phone: 81 ? 3 ? 5817 ? 1050 www.onsemi.com literature fulfillment : literature distribution center for on semiconductor 19521 e. 32nd pkwy, aurora, colorado 80011 usa phone : 303 ? 675 ? 2175 or 800 ? 344 ? 3860 toll free usa/canada fax : 303 ? 675 ? 2176 or 800 ? 344 ? 3867 toll free usa/canada email : orderlit@onsemi.com on semiconductor website : www.onsemi.com order literature : http://www.onsemi.com/orderlit for additional information, please contact your local sales representative ? semiconductor components industries, llc
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