ASM8I1843F-08-MX ALSC [Alliance Semiconductor Corporation], ASM8I1843F-08-MX Datasheet - Page 2

• Manufacturer Part Number: ASM8I1843F-08-MX
• Description: Voltage Mode PWM Controller with EMI Reduction
• Manufacturer: ALSC [Alliance Semiconductor Corporation]

June 2005
rev 0.6
Logic Block Diagram
Pin Diagram
Pin Description
I
F
SNS
SEL
Pin #
COMP
1
2
3
4
5
6
7
8
F
I
SNS
FB
SEL
1
2
3
4
SHUTDOWN
THERMAL
Pin Name
UVLO
ASM8P1843
V
ASM8P18S42
COMP
OL + UC
FSEL
REF
GND
OUT
SENSE
I
V
FB
SNS
DD
/
R
Voltage Mode PWM Controller with EMI Reduction
D
Notice: The information in this document is subject to change without notice.
Input of the PWM Comparator and output of the error amplifier
Feedback, inverting input of the error amplifier
Current sense comparator input
External capacitor selects PWM frequency
Ground
SS modulated PWM output
Supply voltage
5V output for ASM8PI8S42 and ASM8PI843 parts. External resistor ”
to GND sets the modulation spread for the parts with ER suffix.
8
7
6
5
GND
8-Pin MicroSO, P-DIP and SOIC
V
V
OUT
GND
PWM
REF
DD
V
DD
COMP
COMP
F
I
V
SS MOD
SNS
FB
SEL
Control
REF
Function
Error
Amp
1
2
3
4
ASM8P18S44ER / ASM8P18S45ER
V
ASM8P18S42ER
ASM8P18S43ER
ASM8P18S44ER
ASM8P18S45ER
ASM8P18S42 / ASM8P18S42ER
BG
ASM8P1843 / ASM8P18S43ER
DRIVER
8
7
6
5
R
D
”
R
V
OUT
GND
DD
D
2 of 11
FB
OUT