ASM8P18S42 / ASM8P18S42ER ASM8P1843 / ASM8P18S43ER ASM8P18S44ER / ASM8P18S45ER June 2005 rev 0.6 Voltage Mode PWM Controller with EMI Reduction General Description Features ASM8P18xx is a high performance, adjustable frequency, 30V maximum operating voltage with CMOS PWM controller with an integrated spread spectrum technology modulator for EMI reduction. It contains all the functions Adjustable PWM frequencies (40 KHz to 400 KHz) of a standard PWM controller along with a user Maximum Output drive current of 1A. configurable spread spectrum modulation with adjustable Wide duty cycle range (0% minimum to 95% spread. ASM8P18xx allows significant system cost maximum) savings by reducing the number of PCB layers and Spread spectrum modulation with adjustable spread. shielding that are traditionally required to pass EMI Under voltage lockout with hysteresis. regulation. Low startup current: 275?A maximum Pin compatible with industry standard 3842 PWM ASM8P18xx is the industry’s first general purpose EMI controller. reduction IC, specifically designed for use in SMPS Temperature range –40°C to +85°C. systems. ASM8P18xx is compatible to any other 3842 Thermal PWM controllers. protection. shutdown, overload and undercurrent Frequency skip mode. ASM8P18xx is capable of driving 1A maximum current Available in 8-pin plastic MicroSO, P-DIP and SOIC output and it covers a wide supply voltage range from 7V packages. DC to 30V DC. The PWM frequency is selectable from 40 Applications KHz to 400 KHz. Off-line converter DC-DC converter ASM8P18xx provides under voltage lockout, thermal Monitor power supply shutdown, overload, and undercurrent protection. It is Computer/DVD/STB power supply available in 8-pin MicroSO, P-DIP and SOIC package. Wireless base station power supply Telecom power supply Typical Operating Circuit VDD VIN VDD FSEL CT GND ASM8P18xx VREF RD COMP OUT ISNS FB R1 RC CC R2 R3 RS From SMPS Output Alliance Semiconductor 2575 Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • Notice: The information in this document is subject to change without notice. ASM8P18S42 / ASM8P18S42ER ASM8P1843 / ASM8P18S43ER ASM8P18S44ER / ASM8P18S45ER June 2005 rev 0.6 VDD Logic Block Diagram OL + UC SENSE ISNS VREF SS MOD Control PWM DRIVER OUT FSEL VBG UVLO THERMAL SHUTDOWN Error Amp GND Pin Diagram FB COMP 8-Pin MicroSO, P-DIP and SOIC COMP 1 FB 2 ISNS 3 FSEL 4 COMP 1 VDD FB 2 6 OUT ISNS 5 GND FSEL 8 VREF ASM8P18S42 7 ASM8P1843 8 ASM8P18S42ER 7 ASM8P18S43ER 3 ASM8P18S44ER 6 ASM8P18S45ER 4 5 RD VDD OUT GND Pin Description Pin # Pin Name Function 1 2 COMP FB 3 ISNS 4 FSEL External capacitor selects PWM frequency 5 GND Ground 6 OUT SS modulated PWM output 7 VDD 8 Supply voltage 5V output for ASM8PI8S42 and ASM8PI843 parts. External resistor ”RD” VREF/ RD Input of the PWM Comparator and output of the error amplifier Feedback, inverting input of the error amplifier Current sense comparator input to GND sets the modulation spread for the parts with ER suffix. Voltage Mode PWM Controller with EMI Reduction Notice: The information in this document is subject to change without notice. 2 of 11 ASM8P18S42 / ASM8P18S42ER ASM8P1843 / ASM8P18S43ER ASM8P18S44ER / ASM8P18S45ER June 2005 rev 0.6 Application Information Thermal Shutdown Spread Spectrum Deviation The output of ASM8P18xx goes down to zero when the The deviation can be determined by selecting the proper junction temperature of the device rises above 155°C. The resistor at VREF to GND for the parts with ‘ER’ suffix. (Refer device automatically resumes operation when temperature “RD Resistor Vs. % Modulation Depth Plot” for resistor drops to 126°C. This protects the device from thermal selection) breakdown. PWM Frequency Overload and under current protection The PWM frequency can be determined by selecting the ASM8P18xx provides Cycle by cycle current limit and pulls proper capacitance (CT) at the FSEL pin. down PWM output to low as soon as ISNS pin senses a peak voltage of 1V, with a delay to output of 125 nS Start-up Current maximum. ASM8P18xx allows a substantial reduction in the start up current. Low start up current allows high resistance, lower At no load condition when the device senses the peak wattage start-up resistor, to supply controller start up voltage level of less than 0.1V at ISNS pin for a period of power. 200mS, the oscillator enters in to cycle skip mode. Normal condition is restored once ISNS increases beyond 0.1V for Under Voltage Lockout (UVLO) more than three cycles. Details of cycle skip for different When the power supply voltage is below the start up options are provided in the Electrical Characteristics table. threshold voltage, internal circuitry puts the output into low impedance state and sets the output to zero. Absolute Maximum Ratings Symbol Max Units Supply Voltage 30 V IDD Supply Current TBD* mA IOUT Maximum Output Current 1 A ISNS Current Sense Inputs and feedback ISNS, FB, COMP 5 V VDD Parameter Min VREF Reference Voltage 6 V VOSC Oscillator Voltage 4 V VOUT Output Voltage 30 V 150 °C Operation Junction Temperature -45 Storage Temperature -65 Lead Soldering Temperature (10 Seconds) Static Discharge Voltage MIL-STD-883 150 °C 300 °C 2 KV *Maximum output voltage = 30V Voltage Mode PWM Controller with EMI Reduction Notice: The information in this document is subject to change without notice. 3 of 11 ASM8P18S42 / ASM8P18S42ER ASM8P1843 / ASM8P18S43ER ASM8P18S44ER / ASM8P18S45ER June 2005 rev 0.6 Electrical Characteristics Unless otherwise noted, VDD=15V, Capacitor on FSEL = 330pf, ISENS = 0.5V. Specifications are over the –40°C to +85°C ambient temperature range. Typical values are at 25°C. Parameter Symbol Conditions Min Typ Max Units 4.90 5.00 5.1 V REFERENCE SECTION ASM8P18S42 & ASM8P1843 Output voltage VREF Line Regulation N VREF Total Reference variation TA = +25°C, IOUT = 1mA 12V < VDD < 18V, IOUT = 5?A 25 Line, Temperature Temperature Stability 0.7 TCREF Load Regulation (ASM8P1843) mV ImA < Io < 20mA % 0.5 mV/°C 25 mV -20 ?A ERROR AMPLIFIER SECTION Input Bias Current IBIAS Input Voltage VI Open Loop Voltage Gain Vpin1 = 1.25V 1.2 AVOL Power Supply Rejection Ratio PSRR VSTART < VCC < VCC max 1.25 1.3 V 65 dB 80 dB Output Sink Current IOL VFB = 1.32V, VCOMP = 0.15V -1.5 mA Output Source Current IOH VFB = 1.18V, VCOMP = 4.17V 0.3 mA High Output Voltage VOH VFB = 1.25V, RL = 15KP Low Output Voltage VOL VFB = 1.25V 4.17 V 0.15 V CURRENT SENSE SECTION Over Current Protection Threshold VI(MAX) Delay to output TPD Under Current Sense Period TUCS Under Current Recovery Period Cycle Skip FB = 0V (VCOMP = 5V) 0.90 VFB = 0V, ISNS = 0 to 2V TUCSD Cycle Skip condition: ISENS R 0.1V 1.00 ASM8P18S42, ASM8P18S42ER ASM8P1843 ASM8P18S43ER ASM8P18S44ER ASM8P18S45ER 1.10 V 125 ns 200 ms 3 Cycles of PWM Frequency 1/4 1/10 x fS No Skip OUTPUT SECTION ISINK = 50mA ISINK = 200mA ISOURCE = 50mA ISOURCE = 200mA 0.128 0.470 14.71 13.77 Low Output Voltage VOL High Output Voltage VOH On Resistance, High RDS(ON)H ISOURCE = 0.2A 6.5 P On Resistance, Low RDS(ON)L ISINK = 0.2A 2.5 P At VDD =15V Voltage Mode PWM Controller with EMI Reduction Notice: The information in this document is subject to change without notice. V V 4 of 11 ASM8P18S42 / ASM8P18S42ER ASM8P1843 / ASM8P18S43ER ASM8P18S44ER / ASM8P18S45ER June 2005 rev 0.6 Parameter Symbol Conditions Min Typ Max Units Rise Time tR TA = 25°C, CL=1nF 30 nS Fall Time tF TA = 25°C, CL=1nF 30 nS Shoot Through Current 0 UVLO SECTION Start threshold Vth(START) Stop Threshold Vth(STOP) ASM8P1843, ASM8P18S43ER, ASM8P18S45ER, ASM8P18S42, ASM8P18S42ER ASM8P18S44ER ASM8P1843, ASM8P18S43ER, ASM8P18S45ER ASM8P18S42, ASM8P18S42ER, ASM8P18S44ER 7.8 V 15.4 6.7 V 10.2 PWM SECTION PWM frequency fS ASM8P18S44ER, ASM8P18S45ER Duty Cycle Range ASM8P18S42, ASM8P18S42ER, ASM8P1843, ASM8P18S43ER 40 400 0 50 kHz % 0 95 TOTAL DEVICE Start up Current IST Peak Output Current 275 IOUT(PK) Operating Current ICC(OPR) Thermal Shutdown VZ 1000 VFB = 0; ISNS = 0.5; VDD = 15V Junction Temp Thermal Recovery 5 ?A mA 6 mA 155 °C 126 °C SPREAD SPECTRUM SECTION ASM8P18S43ER, ASM8P18S45ER ASM8P18S42, ASM8P18S42ER, ASM8P18S44ER Modulation Rate Modulation Depth 1/20 of Switching Frequency (KHz) 1/10 Refer RD Resistor Vs. % Modulation Depth Plot OSCILLATOR SECTION Frequency change with Voltage Df/d VCC 0.04 Oscillator Amplitude Temperature Stability TOSC 0.1 Voltage Mode PWM Controller with EMI Reduction Notice: The information in this document is subject to change without notice. 0.05 % 1.66 V (Pk-Pk) %/°C 5 of 11 ASM8P18S42 / ASM8P18S42ER ASM8P1843 / ASM8P18S43ER ASM8P18S44ER / ASM8P18S45ER June 2005 rev 0.6 Frequency Selection Curve 700 600 FS(KHZ) 500 400 300 200 100 0 15 30 47 62 100 147 220 330 550 Ct (pF) RD Resistor vs % Modulation Depth Plot 16 14 fS=40KHz +/-MD (% of Fs) 12 10 8 6 4 fS=400KHZ 2 0 0.51 1 2.2 6.8 10 20 RD (M Ohms) Voltage Mode PWM Controller with EMI Reduction Notice: The information in this document is subject to change without notice. 6 of 11 ASM8P18S42 / ASM8P18S42ER ASM8P1843 / ASM8P18S43ER ASM8P18S44ER / ASM8P18S45ER June 2005 rev 0.6 Package Information 8-lead MSOP Package Dimensions Symbol Inches Min Max Millimeters 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 U 0° 6° 0° 6° S 0.0206 BSC 0.52 BSC Voltage Mode PWM Controller with EMI Reduction Notice: The information in this document is subject to change without notice. 7 of 11 ASM8P18S42 / ASM8P18S42ER ASM8P1843 / ASM8P18S43ER ASM8P18S44ER / ASM8P18S45ER June 2005 rev 0.6 8-lead (150-mil) SOIC Package H E D A2 A A1 D C e L B Dimensions Symbol Inches Min Max Millimeters 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 U 0° 8° 0° 8° Voltage Mode PWM Controller with EMI Reduction Notice: The information in this document is subject to change without notice. 8 of 11 ASM8P18S42 / ASM8P18S42ER ASM8P1843 / ASM8P18S43ER ASM8P18S44ER / ASM8P18S45ER June 2005 rev 0.6 8-lead PDIP Package Dimensions Symbol Inches Min A Max Millimeters Min Max 0.210 5.33 A1 0.015 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 eB L 0.38 2.54 BSC 0.430 0.115 0.150 10.92 2.92 3.81 Voltage Mode PWM Controller with EMI Reduction Notice: The information in this document is subject to change without notice. 9 of 11 ASM8P18S42 / ASM8P18S42ER ASM8P1843 / ASM8P18S43ER ASM8P18S44ER / ASM8P18S45ER June 2005 rev 0.6 Ordering Information ASM Ordering Part Number Package Operating Minimum Maximum Modulation Peak Start-up Package Top Temp Operating Duty Depth Output Voltage Mark Range Voltage Cycle Control Current ASM8I18S42ERF-08-Px 8-PDIP -45 to 85°C 15.4V 10.2V 95 External R 1A 8I18S42ERF ASM8I18S42ERF-08-Mx 8-MSOP -45 to 85°C 15.4V 10.2V 95 External R 1A 8I18S42ERF ASM8I18S42ERF-08-Sx 8-SOIC 15.4V 10.2V 95 External R 1A 8I18S42ERF -45 to 85°C ASM8P18S42ERF-08-Px 8-PDIP 0 to 70°C 15.4V 10.2V 95 External R 1A 8P18S42ERF ASM8P18S42ERF-08-Mx 8-MSOP 0 to 70°C 15.4V 10.2V 95 External R 1A 8P18S42ERF ASM8P18S42ERF-08-Sx 8-SOIC 0 to 70°C 15.4V 10.2V 95 External R 1A 8P18S42ERF ASM8I18S43ERF-08-Px 8-PDIP -45 to 85°C 7.8V 6.7V 95 External R 1A 8I18S43ERF ASM8I18S43ERF-08-Mx 8-MSOP -45 to 85°C 7.8V 6.7V 95 External R 1A 8I18S43ERF ASM8I18S43ERF-08-Sx 8-SOIC -45 to 85°C 7.8V 6.7V 95 External R 1A 8I18S43ERF ASM8P18S43ERF-08-Px 8-PDIP 0 to 70°C 7.8V 6.7V 95 External R 1A 8P18S43ERF ASM8P18S43ERF-08-Mx 8-MSOP 0 to 70°C 7.8V 6.7V 95 External R 1A 8P18S43ERF ASM8P18S43ERF-08-Sx 8-SOIC 0 to 70°C 7.8V 6.7V 95 External R 1A 8P18S43ERF ASM8I18S44ERF-08-Px 8-PDIP -45 to 85°C 15.4V 10.2V 50 External R 1A 8I18S44ERF ASM8I18S44ERF-08-Mx 8-MSOP -45 to 85°C 15.4V 10.2V 50 External R 1A 8I18S44ERF ASM8I18S44ERF-08-Sx 8-SOIC -45 to 85°C 15.4V 10.2V 50 External R 1A 8I18S44ERF ASM8P18S44ERF-08-Px 8-PDIP 0 to 70°C 15.4V 10.2V 50 External R 1A 8P18S44ERF ASM8P18S44ERF-08-Mx 8-MSOP 0 to 70°C 15.4V 10.2V 50 External R 1A 8P18S44ERF ASM8P18S44ERF-08-Sx 8-SOIC 0 to 70°C 15.4V 10.2V 50 External R 1A 8P18S44ERF ASM8I18S45ERF-08-Px 8-PDIP -45 to 85°C 7.8V 6.7V 50 External R 1A 8I18S45ERF ASM8I18S45ERF-08-Mx 8-MSOP -45 to 85°C 7.8V 6.7V 50 External R 1A 8I18S45ERF ASM8I18S45ERF-08-Sx 8-SOIC 7.8V 6.7V 50 External R 1A 8I18S45ERF -45 to 85°C ASM8P18S45ERF-08-Px 8-PDIP 0 to 70°C 7.8V 6.7V 50 External R 1A 8P18S45ERF ASM8P18S45ERF-08-Mx 8-MSOP 0 to 70°C 7.8V 6.7V 50 External R 1A 8P18S45ERF ASM8P18S45ERF-08-Sx 8-SOIC 0 to 70°C 7.8V 6.7V 50 External R 1A 8P18S45ERF ASM8I18S42F-08-Px 8-PDIP -45 to 85°C 15.4V 10.2V 95 NA 1A 8I18S42F ASM8I18S42F-08-Mx 8-MSOP -45 to 85°C 15.4V 10.2V 95 NA 1A 8I18S42F ASM8I18S42F-08-Sx 8-SOIC -45 to 85°C 15.4V 10.2V 95 NA 1A 8I18S42F ASM8P18S42F-08-Px 8-PDIP 0 to 70°C 15.4V 10.2V 95 NA 1A 8P18S42F ASM8P18S42F-08-Mx 8-MSOP 0 to 70°C 15.4V 10.2V 95 NA 1A 8P18S42F ASM8P18S42F-08-Sx 8-SOIC 0 to 70°C 15.4V 10.2V 95 NA 1A 8P18S42F ASM8I1843F-08-Px 8-PDIP -45 to 85°C 7.8V 6.7V 95 NA 1A 8I1843F ASM8I1843F-08-Mx 8-MSOP -45 to 85°C 7.8V 6.7V 95 NA 1A 8I1843F ASM8I1843F-08-Sx 8-SOIC -45 to 85°C 7.8V 6.7V 95 NA 1A 8I1843F ASM8P1843F-08-Px 8-PDIP 0 to 70°C 7.8V 6.7V 95 NA 1A 8P1843F ASM8P1843F-08-Mx 8-MSOP 0 to 70°C 7.8V 6.7V 95 NA 1A 8P1843F ASM8P1843F-08-Sx 8-SOIC 0 to 70°C 7.8V 6.7V 95 NA 1A 8P1843F Note: All Alliance Semiconductor Lead Free Parts are RoHS Compliant. All parts are Lead Free by default. Contact factory for Non Lead Free Parts. Licensed under US Patent numbers 5,488,627 and 5,631,921. Voltage Mode PWM Controller with EMI Reduction Notice: The information in this document is subject to change without notice. 10 of 11 ASM8P18S42 / ASM8P18S42ER ASM8P1843 / ASM8P18S43ER ASM8P18S44ER / ASM8P18S45ER June 2005 rev 0.6 Alliance Semiconductor Corporation 2575, Augustine Drive, Santa Clara, CA 95054 Tel# 408-855-4900 Fax: 408-855-4999 www.alsc.com Copyright © Alliance Semiconductor All Rights Reserved Preliminary Information Part Number: ASM8P18S42 / ASM8P18S42ER ASM8P18S42 / ASM8P18S43ER ASM8P18S44ER / ASM8P18S45ER Document Version: v0.6 Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to Alliance Semiconductor, dated 11-11-2003 © 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 changes to this document and its products at any time without notice. Alliance assumes no responsibility for any errors that may appear in this document. The data contained herein represents Alliance's best data and/or estimates at the time of issuance. Alliance reserves 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 intended to operate as, or provide, any guarantee or warrantee to any user or customer. Alliance does not assume any responsibility or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale and/or use of Alliance products including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual 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 patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of Alliance or third parties. Alliance does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure 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. Voltage Mode PWM Controller with EMI Reduction Notice: The information in this document is subject to change without notice. 11 of 11