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asm8p18s42er asm8p18s43er december 2005 asm8p18s45er rev 1.2 notice: the information in this document is subject to change without notice. alliance semiconductor 2575 augustine drive ? santa clara, ca ? tel: 408.855.4900 ? fax: 408.855.4999 ? www.alsc.com voltage mode pwm controller with emi reduction general description asm8p18xx is a high performance, adjustable frequency, pwm controller with an integrated spread spectrum modulator for emi reduction. it contains all the functions of a standard pwm controller along with a user configurable spread spectrum modulation with adjustable spread. asm8p18xx allows significant system cost savings by reducing the number of pcb layers and shielding that are traditionally required to pass emi regulation. asm8p18xx is the industry?s first general purpose emi reduction ic, specifically designed for use in smps systems. asm8p18xx is pin co mpatible to 384x family of pwm controllers. asm8p18xx is capable of driving 1a maximum current output and it covers a wide supply voltage range from 7v dc to 30v dc (25v max for micro so). the pwm frequency is selectable from 40 khz to 400 khz. asm8p18xx provides under voltage lockout, thermal shutdown, and overload and cy cle-by-cycle current limit. as8p18s4xx provides cycle slip feature which reduces no load power consumption of converters. it is available in 8-pin microso, p-dip and soic package. typical operating circuit features ? 30v maximum operating voltage with bicmos technology (25v max for micro so) ? adjustable pwm frequencies ? 40khz to 400khz operation ? maximum output drive current of 1a ? wide duty cycle range (0% minimum to 99% maximum) ? spread spectrum modulation with adjustable spread for emi reduction ? under voltage lockout with hysteresis ? low startup current: 700a maximum ? pin compatible with industry standard 3842 pwm controller ? temperature range ?40 c to +85 c ? thermal shutdown and overload protection ? frequency skip mode at light load condition ? available in 8-pin plastic microso, p-dip and soic packages applications ? off-line converter ? dc-dc converter ? monitor power supply ? computer/dvd/stb power supply ? wireless base station power supply ? telecom power supply from smps output v dd v dd v in fsel gnd c t v ref out comp r c c c r 1 r 2 r s i sns fb r d r 3 asm8p18xx
asm8p18s42er asm8p18s43er december 2005 asm8p18s45er rev 1.2 pwm controller with emi reduction 2 of 11 notice: the information in this document is subject to change without notice. logic block diagram pin diagram pin description pin # pin name function 1 comp input of the pwm comparator and output of the error amplifier 2 fb feedback, inverting input of the error amplifier 3 i sns current sense comparator input 4 fsel external capacitor selects pwm frequency 5 gnd ground 6 out ss modulated pwm output 7 v dd supply voltage 8 r ss external resistor ? r ss ? to gnd sets depth of modulation. i sns gnd pwm ss mod control ol + uc sense uvlo thermal shutdown v bg driver error amp comp fb out r ss v dd f sel a sm8p18s42er comp 1 2 3 4 8 7 6 5 fb i sns f sel gnd out v dd r ss asm8p18s43er a sm8p18s45er
asm8p18s42er asm8p18s43er december 2005 asm8p18s45er rev 1.2 pwm controller with emi reduction 3 of 11 notice: the information in this document is subject to change without notice. application information spread spectrum deviation the deviation can be determined by selecting the proper resistor at r ss to gnd (refer ?r ss resistor vs. % modulation depth plot? for resistor selection) pwm frequency the pwm frequency can be determined by selecting the proper capacitance (c t ) at the fsel pin. start-up current asm8p18xx allows a substantial reduction in the start up current. low start up current allows high resistance, lower wattage start-up resistor, to supply controller start up power. under voltage lockout (uvlo) when the power supply voltage is below the start up threshold voltage, internal circuitry puts the output into low impedance state and sets the output to zero. thermal shutdown the output of asm8p18xx goes down to zero when the junction temperature of the device rises above 160c. the device automatically resumes operation when temperature drops to 130c. this protec ts the device from thermal breakdown. overload and under current protection asm8p18xx provides cycle by cycle current limit and pulls down pwm output to low as soon as i sns pin senses a peak voltage of 1v, with a delay to output of 125 ns maximum. at no load condition when the device senses the peak voltage level of less than 0.1v at i sns pin for a period of 200ms, the oscillator enters in to cycle skip mode. normal condition is restored once i sns increases beyond 0.1v for more than three cycles. details of cycle skip for different options are provided in the elec trical characteristics table. absolute maximum ratings symbol parameter min max units v dd supply voltage 30 v i dd supply current 15 ma i out maximum output current 1 a i sns current sense inputs and feedback i sns, fb, comp 5 v v osc oscillator voltage 4 v v out output voltage 30 v operation junction temperature -45 150 c storage temperature -65 150 c lead soldering temperature (10 seconds) 300 c hbm 2 kv esd rating mm 200 v note: for microso devices maximum v ddmax = 25v & i ddmax =10ma package thermal resistance 8-pin plastic dip ( ja ) 125c/w 8-pin microso ( ja ) 250c/w 8-pin so ( ja ) 170c/w
asm8p18s42er asm8p18s43er december 2005 asm8p18s45er rev 1.2 pwm controller with emi reduction 4 of 11 notice: the information in this document is subject to change without notice. electrical characteristics unless otherwise noted, v dd =15v, capacitor on f sel = 330pf, i sens = 0.5v. specifications are over the ?40c to +85c ambient temperature range. typical values are at 25c. parameter symbol conditions min typ max units error amplifier section input bias current i bias -170 a input voltage v i v pin1 = 2.5v 1.19 1.25 1.29 v open loop voltage gain a vol 37 db power supply rejection ratio psrr v start < v cc < v cc max 80 db output sink current i ol v fb = 1.32v, v comp = 0.15v -0.06 ma output source current i oh v fb = 1.18v, v comp = 4.17v -0.13 ma high output voltage v oh v fb = 1.25v, r l = 15k ? 3.6 v low output voltage v ol v fb = 1.25v 0.35 v current sense section over current protection threshold v i(max) fb = 0v (v comp = 5v) 0.90 1.00 1.10 v delay to output t pd v fb = 0v, tested with 2v,20ns i sns pulse 125 ns under current sense period t ucs 175 200 375 ms under current recovery period t ucsd 3 cycles of pwm frequency asm8p18s42er 1/4 asm8p18s43er 1/10 cycle skip cycle skip condition: i sens 0.1v asm8p18s45er no skip x f s output section low output voltage v ol i sink = 0.2a 0.312 0.424 0.57 v high output voltage v oh i source = 0.2a 13.4 13.91 14.37 v on resistance, high r ds(on)h i source = 0.2a 6.5 ? on resistance, low r ds(on)l i sink = 0.2a 2.5 ? rise time t r t a = 25c, c l =1nf 20 ns fall time t f t a = 25c, c l =1nf 20 ns shoot through current 0 uvlo section asm8p18s43er, asm8p18s45er, 5.8 9.5 start threshold v th(start) asm8p18s42er 12 16.5 v asm8p18s43er, asm8p18s45er 5.5 7.9 v stop threshold v th(stop) asm8p18s42er, 7 11.9 pwm frequency f s 40 400 khz
asm8p18s42er asm8p18s43er december 2005 asm8p18s45er rev 1.2 pwm controller with emi reduction 5 of 11 notice: the information in this document is subject to change without notice. parameter symbol conditions min typ max units asm8p18s45er 0 40 47 duty cycle range asm8p18s42er, asm8p18s43er 0 99 % total device start up current i st 250 700 a peak output current i out(pk) 1 a operating current i cc(opr) v fb = 0; i sns = 0.5; v dd = 15v 5 6.2 ma thermal shutdown v z junction temp 155 c thermal recovery 126 c spread spectrum section asm8p18s43er, asm8p18s45er 1/20 modulation rate asm8p18s42er, 1/10 of switching frequency (khz) modulation depth refer r ss resistor vs. % modulation depth plot oscillator section initial accuracy f init t a =25 c 47 48 49 khz frequency change with voltage df/d v cc 0.04 0.05 % oscillator amplitude 1.7 1.76 1.8 v (pk-pk) temperature stability t osc 0.12 %/ c
asm8p18s42er asm8p18s43er december 2005 asm8p18s45er rev 1.2 pwm controller with emi reduction 6 of 11 notice: the information in this document is subject to change without notice. frequency selection curve 1 10 100 1000 30 47 62 100 147 220 330 550 ct (pf) fs(khz) r ss resistor vs. modulation depth (md) asm8p18s42er asm8p18s43er_ asm8p18s45er f s = 100k f s =2 00 k f s =300k h f s =1 00/ 2 00 kh f s = 300/ 4 00 kh
asm8p18s42er asm8p18s43er december 2005 asm8p18s45er rev 1.2 pwm controller with emi reduction 7 of 11 notice: the information in this document is subject to change without notice. package information 8-lead msop package dimensions inches millimeters symbol min max min max a 0.032 0.044 0.81 1.10 a1 0.002 0.006 0.05 0.15 a2 0.030 0.038 0.76 0.97 b 0.012 bsc 0.30 bsc c 0.004 0.008 0.10 0.20 d 0.114 0.122 2.90 3.10 e 0.0256 bsc 0.65 bsc e1 0.114 0.122 2.90 3.10 e 0.184 0.200 4.67 5.08 l 0.016 0.026 0.41 0.66 0 6 0 6 s 0.0206 bsc 0.52 bsc
asm8p18s42er asm8p18s43er december 2005 asm8p18s45er rev 1.2 pwm controller with emi reduction 8 of 11 notice: the information in this document is subject to change without notice. 8-lead (150-mil) soic package d e h d a1 a2 a l c b e dimensions inches millimeters symbol min max min max a1 0.004 0.010 0.10 0.25 a 0.053 0.069 1.35 1.75 a2 0.049 0.059 1.25 1.50 b 0.012 0.020 0.31 0.51 c 0.007 0.010 0.18 0.25 d 0.193 bsc 4.90 bsc e 0.154 bsc 3.91 bsc e 0.050 bsc 1.27 bsc h 0.236 bsc 6.00 bsc l 0.016 0.050 0.41 1.27 0 8 0 8
asm8p18s42er asm8p18s43er december 2005 asm8p18s45er rev 1.2 pwm controller with emi reduction 9 of 11 notice: the information in this document is subject to change without notice. 8-lead pdip package dimensions inches millimeters symbol min max min max a 0.210 5.33 a1 0.015 0.38 a2 0.115 0.195 2.92 4.95 b 0.014 0.022 0.36 0.56 b2 0.045 0.070 1.14 1.78 c 0.008 0.014 0.20 0.36 d 0.355 0.400 9.02 10.16 e 0.300 0.325 7.62 8.26 e1 0.240 0.280 6.10 7.11 e 0.10 bsc 2.54 bsc eb 0.430 10.92 l 0.115 0.150 2.92 3.81
asm8p18s42er asm8p18s43er december 2005 asm8p18s45er rev 1.2 pwm controller with emi reduction 10 of 11 notice: the information in this document is subject to change without notice. ordering information part number package operating temp range start-up voltage (typ) minimum operating voltage (typ) maximum duty cycle top mark asm8i18s42erf-08-px 8-pdip -40 to 85c 15.4v 10.2v 99 8i18s42erf asm8i18s42erf-08-sx 8-soic -40 to 85c 15.4v 10.2v 99 8i18s42erf asm8p18s42erf-08-px 8-pdip 0 to 70c 15.4v 10.2v 99 8p18s42erf asm8p18s42erf-08-mx 8-msop 0 to 70c 15.4v 10.2v 99 8p18s42erf asm8p18s42erf-08-sx 8-soic 0 to 70c 15.4v 10.2v 99 8p18s42erf asm8i18s43erf-08-px 8-pdip -40 to 85c 7.8v 6.7v 99 8i18s43erf asm8i18s43erf-08-sx 8-soic -40 to 85c 7.8v 6.7v 99 8i18s43erf asm8p18s43erf-08-px 8-pdip 0 to 70c 7.8v 6.7v 99 8p18s43erf asm8p18s43erf-08-mx 8-msop 0 to 70c 7.8v 6.7v 99 8p18s43erf asm8p18s43erf-08-sx 8-soic 0 to 70c 7.8v 6.7v 99 8p18s43erf asm8i18s45erf-08-px 8-pdip -40 to 85c 7.8v 6.7v 47 8i18s45erf asm8i18s45erf-08-sx 8-soic -40t o 85c 7.8v 6.7v 47 8i18s45erf asm8p18s45erf-08-px 8-pdip 0 to 70c 7.8v 6.7v 47 8p18s45erf asm8p18s45erf-08-mx 8-msop 0 to 70c 7.8v 6.7v 47 8p18s45erf asm8p18s45erf-08-sx 8-soic 0 to 70c 7.8v 6.7v 47 8p18s45erf asm8i18s42erg-08-px 8-pdip -40 to 85c 15.4v 10.2v 99 8i18s42erg asm8i18s42erg-08-sx 8-soic -40 to 85c 15.4v 10.2v 99 8i18s42erg asm8p18s42erg-08-px 8-pdip 0 to 70c 15.4v 10.2v 99 8p18s42erg asm8p18s42erg-08-mx 8-msop 0 to 70c 15.4v 10.2v 99 8p18s42erg asm8p18s42erg-08-sx 8-soic 0 to 70c 15.4v 10.2v 99 8p18s42erg asm8i18s43erg-08-px 8-pdip -40 to 85c 7.8v 6.7v 99 8i18s43erg asm8i18s43erg-08-sx 8-soic -40 to 85c 7.8v 6.7v 99 8i18s43erg ASM8P18S43ERG-08-PX 8-pdip 0 to 70c 7.8v 6.7v 99 8p18s43erg asm8p18s43erg-08-mx 8-msop 0 to 70c 7.8v 6.7v 99 8p18s43erg asm8p18s43erg-08-sx 8-soic 0 to 70c 7.8v 6.7v 99 8p18s43erg asm8i18s45erg-08-px 8-pdip -40 to 85c 7.8v 6.7v 47 8i18s45erg asm8i18s45erg-08-sx 8-soic -40 to 85c 7.8v 6.7v 47 8i18s45erg asm8p18s45erg-08-px 8-pdip 0 to 70c 7.8v 6.7v 47 8p18s45erg asm8p18s45erg-08-mx 8-msop 0 to 70c 7.8v 6.7v 47 8p18s45erg asm8p18s45erg-08-sx 8-soic 0 to 70c 7.8v 6.7v 47 8p18s45erg note: all alliance semiconductor lead free parts are rohs compli ant. the symbol ?f? (at the end of the ordering information) in dicates lead free parts, whereas ?g? indicates green parts.
asm8p18s42er asm8p18s43er december 2005 asm8p18s45er rev 1.2 pwm controller with emi reduction 11 of 11 notice: the information in this document is subject to change without notice. licensed under us patent numbers 5,488,627 and 5,631,921 and other us patents pending. ? copyright 2003 alliance semiconductor corporation. all rights reserved. our three-point logo, our name and intelliwatt are trademarks or registered trademarks of alliance. all other brand and product names may be the trademarks of their respective companies. alliance reserves the right to make ch anges to this document and its products at any time without notice. alliance assumes no responsibility for any errors t hat may appear in this document. the data contained herein represents alliance's best data and/or estimate s at the time of issuance. alliance rese rves the right to change or correct this data at any time, without notice. if the product described herein is under development, significant changes to these specifications are possible. the information in this product data sheet is intended to be general descriptive information for potential customers and users, and is not in tended to operate as, or provide, any guarantee or warrantee to any user or customer. alliance does not assume any responsibility or lia bility arising out of the applic ation or use of any product described herein, and disclaims any express or implied warrant ies related to the sale and/or use of alliance products including liability or warranties related to fitness for a particular purpose, mercha ntability, or infringement of any intellec tual property rights, except as express agreed to in alliance's terms and conditions of sale (which are available from alliance). all sales of alliance products are made exclusively according to alliance's terms and conditions of sale. the purchase of products from alliance does not convey a license under any pa tent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of alli ance or third parties. alliance does not aut horize its products for use as critical components in life-supporting systems where a malfunction or fa ilure may reasonably be expected to result in significant injury to the user, and the inclusion of alliance products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify alliance against all claims arising from such use. alliance semiconductor corporation 2575 augustine drive santa clara, ca 95054 tel# 408-855-4900 fax: 408-855-4999 www.alsc.com copyright ? alliance semiconductor a ll rights reserved preliminary information part number: asm8p18s42er asm8p18s43er asm8p18s45er document version: v1.2 note: this product utilizes us patent # 6,646,463 impedance emulator patent issued to alliance semiconductor, dated 11-11-2003, and other us patents pending.

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