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PDF ASM8P18S45ER Data sheet ( Hoja de datos )
| Número de pieza | ASM8P18S45ER | |
| Descripción | (ASM8x184x) Voltage Mode PWM Controller | |
| Fabricantes | Alliance Semiconductor Corporation | |
| Logotipo |  |
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June 2005
rev 0.6
ASM8P18S42 / ASM8P18S42ER
ASM8P1843 / ASM8P18S43ER
ASM8P18S44ER / ASM8P18S45ER
Voltage Mode PWM Controller with EMI Reduction
General Description
Features
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.
www.DataSheet4U.com
ASM8P18xx is the industry’s first general purpose EMI
reduction IC, specifically designed for use in SMPS
systems. ASM8P18xx is compatible to any other 3842
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. The PWM frequency is selectable from 40
KHz to 400 KHz.
ASM8P18xx provides under voltage lockout, thermal
shutdown, overload, and undercurrent protection. It is
available in 8-pin MicroSO, P-DIP and SOIC package.
30V maximum operating voltage with CMOS
technology
Adjustable PWM frequencies (40 KHz to 400 KHz)
Maximum Output drive current of 1A.
Wide duty cycle range (0% minimum to 95%
maximum)
Spread spectrum modulation with adjustable spread.
Under voltage lockout with hysteresis.
Low startup current: 275?A maximum
Pin compatible with industry standard 3842 PWM
controller.
Temperature range –40°C to +85°C.
Thermal shutdown, overload and undercurrent
protection.
Frequency skip mode.
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
Typical Operating Circuit
VDD
VDD
FSEL
CT GND
ASM8P18xx
VIN
VREF
RD COMP
OUT
FB ISNS
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.
1 page  
June 2005
ASM8P18S42 / ASM8P18S42ER
ASM8P1843 / ASM8P18S43ER
ASM8P18S44ER / ASM8P18S45ER
rev 0.6
Parameter
Rise Time
Fall Time
Shoot Through Current
UVLO SECTION
Start threshold
www.DataShSeteotp4TUh.rceoshmold
PWM SECTION
PWM frequency
Symbol
tR
tF
Conditions
TA = 25°C, CL=1nF
TA = 25°C, CL=1nF
Vth(START)
Vth(STOP)
fS
ASM8P1843,
ASM8P18S43ER,
ASM8P18S45ER,
ASM8P18S42,
ASM8P18S42ER
ASM8P18S44ER
ASM8P1843,
ASM8P18S43ER,
ASM8P18S45ER
ASM8P18S42,
ASM8P18S42ER,
ASM8P18S44ER
Min Typ Max
30
30
0
7.8
15.4
6.7
10.2
40 400
Duty Cycle Range
TOTAL DEVICE
ASM8P18S44ER,
ASM8P18S45ER
ASM8P18S42,
ASM8P18S42ER,
ASM8P1843,
ASM8P18S43ER
0
0
50
95
Start up Current
Peak Output Current
Operating Current
Thermal Shutdown
Thermal Recovery
SPREAD SPECTRUM SECTION
Modulation Rate
Modulation Depth
OSCILLATOR SECTION
IST
IOUT(PK)
ICC(OPR)
VZ
VFB = 0; ISNS = 0.5;
VDD = 15V
Junction Temp
1000
5
155
126
275
6
ASM8P18S43ER,
ASM8P18S45ER
ASM8P18S42,
ASM8P18S42ER,
ASM8P18S44ER
1/20
1/10
Refer RD Resistor Vs. % Modulation Depth Plot
Frequency change with Voltage
Oscillator Amplitude
Temperature Stability
Df/d VCC
TOSC
0.04 0.05
1.66
0.1
Units
nS
nS
V
V
kHz
%
?A
mA
mA
°C
°C
of Switching
Frequency
(KHz)
%
V (Pk-Pk)
%/°C
Voltage Mode PWM Controller with EMI Reduction
Notice: The information in this document is subject to change without notice.
5 of 11
5 Page 
June 2005
rev 0.6
ASM8P18S42 / ASM8P18S42ER
ASM8P1843 / ASM8P18S43ER
ASM8P18S44ER / ASM8P18S45ER
www.DataSheet4U.com
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
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