ALSC ASM8I18S45ERF-08-SX

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