CS5101
CS5101
Secondary Side Post Regulator for AC/DC
and DC/DC Multiple Output Converters
Description
The CS5101 is a bipolar monolithic
secondary side post regulator
(SSPR) which provides tight regula-
tion of multiple output voltages in
AC-DC or DC-DC converters.
Leading edge pulse width modula-
tion is used with the CS5101.
The CS5101 is designed to operate
over an 8V to 45V supply voltage
(V
CC
) range and up to a 75V drive
voltage (V
C
).
The CS5101 features include a totem
pole output with 1.5A peak output
current capability, externally pro-
grammable overcurrent protection,
an on chip 2% precision 5V refer-
ence, internally compensated error
amplifier, externally synchronized
switching frequency, and a power
switch drain voltage monitor. It is
available in a 14 lead plastic DIP or
a 16 lead wide body SO package.
Features
s
1.5A Peak Output
(Grounded Totem Pole)
s
8V to 75V Gate Drive Voltage
s
8V to 45V Supply Voltage
s
300ns Propagation Delay
s
1% Error Amplifier
Reference Voltage
s
Lossless Turn On and
Turn Off
s
Sleep Mode: < 100µA
s
Overcurrent Protection with
Dedicated Differential Amp
s
Synchronization to External
Clock
s
External Power Switch
Drain Voltage Monitor
Application Diagram
V
SY
L1
1
TR
C
R4
3
Q1
4
5
R10
V
OUT
6
R5
R6
C
R5
R8
R11
R13
+
C6
Package Options
14L PDIP
SYNC
1
R9
R12
R14
V
D
V
C
V
G
PGnd
IS COMP
IS-
IS+
Gnd
C
R1
C5
+
V
CC
V
REF
LGnd
R1
R2
C
R3
R7
V
FB
COMP
V
SYNC
V
CC
R3
C
R2
V
REF
LGnd
V
FB
+
C1
C2
R4
COMP
RAMP
V
D
RAMP
CS5101
SSPR
V
C
V
G
C4
16L SO Wide
SYNC
V
CC
V
REF
DGnd
1
PGnd
IS COMP
IS-
IS+
V
D
V
C
V
G
PGnd
PGnd
IS COMP
IS-
IS+
2
C3
C
R
AGnd
V
FB
COMP
RAMP
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
Rev. 3/31/97
1
A
¨
Company
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
