CS5106
CS5106
Multi-Feature, Synchronous plus Auxiliary
PWM Controller
Description
The CS5106 is a fixed frequency,
current mode controller with one
single NFET driver and one dual
FET, synchronous driver. The syn-
chronous driver allows for
increased efficiency of the main iso-
lated power stage and the single
driver allows the designer to devel-
op auxiliary supplies for controller
power as well as secondary side
house keeping. In addition,
because the synchronous drivers
have programmable FET non-over-
lap, the CS5106 is an ideal con-
troller for soft-switched converter
topologies.
The CS5106 is specifically designed
for isolated topologies where speed,
flexibility, reduced size and
reduced component count are
requirements. The controller con-
tains the following features:
Undervoltage Shutdown,
Overvoltage Shutdown,
Programmable Frequency,
Programmable Synchronous Non-
Overlap Time, Master/Slave
Clocking with Frequency Range
Detection, Enable, Output
Undervoltage Protection with
Timer, 20mA 5V Output, 80ns
PWM propagation delay, and
Controlled Hiccup Mode.
The CS5106 has junction tempera-
ture and supply ranges of -40ûC to
125ûC and 9V to 16V respectively
and is available in the 24 lead SSOP
package.
Features
s
Programmable Fixed
Frequency
s
Programmable FET Non-
overlap
s
Enable Lead
s
12V Fixed Auxiliary
Supply Control
s
Under and Overvoltage
Shutdown
s
Output Undervoltage
Protection with Timer
s
Master/Slave Clock
Syncing Capability
s
Sync Frequency Range
Detection
s
80ns PWM Propagation
Delay
s
20mA 5V Reference
Output
s
Small 24 lead SSOP
Package
s
Controlled Hiccup Mode
Applications Diagram
48V to 3.3V Forward Converter with Synchronous Rectifiers
V
IN
R27
R1
V
AUXP
R3
R2
R4
C3
SYNC
IN
ENABLE
V
5REF
CS5106
UVSD
ENABLE
PROGRAM
OVSD
V
5REF
SYNC
IN
SYNC
OUT
OAM
OA
OUT
FADJ
OUVDELAY DLYSET
I
LIM2
I
LIM1
RAMP2
RAMP1
V
FB1
V
FB2
V
SS
GATE2B
V
CC
GATE2
V
DD
GATE1
SYNC
OUT
C6
R24
D8
R25
R14
C8
R13
R9
T4
CNY17-4
C1
C2
D5
R7
R20
R15
R16
C14 R17
C13
R18
Package Options
24 Lead SSOP
UVSD
1
V
AUXP
D1
T1
C4
TL431
V
AUXS
Q7
R19
V
IN
V
IN
R8
ENABLE
PROGRAM
SYNC
IN
SYNC
OUT
FADJ
DLYSET
I
LIM2
RAMP2
V
FB2
GATE2B
GATE2
V
DD
OVSD
V
5REF
OAM
OAOUT
L1
Q5
Q3
Q4
C5
D2
Q1
D3
Q2
C9
C10
R10
V
IN
R11
R26
Q6
T2
T3
R12
D4
D7
R23
C11
V
MAIN
C12
R21
R5
V
AUXS
C7
OUVDELAY
ILIM1
RAMP1
V
FB1
V
SS
V
CC
GATE1
R6
D6
R22
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. 10/27/98
1
A
¨
Company
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
