Daewoo 2898ST Service Manual page 28

STR-S5707 (Hybrid IC for a Switching Regulator)
(1) General Description
The STR-S5707 is a Hybrid IC with a built in power transistor and a separate excitation control IC,
designed for converter type switching mode power supply applications.
The IC is capable of quasi-resonant mode and requires small number of external component.
(2) Feature
• Small SIP isolated package : Resin sealed type (transfer mold)
• Lower power dissipation at a lighter load
• Many protection function : - Pulse-by-pulse over current protection
- Over-voltage protection with a latch
- Thermal protection with a latch
• These protection functions are incorporated and can be latched with an external signal.
(3) Block Diagram
(4) Pin Description
PIN NAME
1 Collector
2 Ground
3 Base
4 Sink
5 Over-current
protection
6 Inhibit
Latch
7 Sensing
8 Drive
9 Vin
SYMBOL DESCRIPTION
C Collector of power Tr
GND ground (Emitter of power Tr)
B Base of power Tr
SINK Base current (IS) input
OCP over-current sensing signal input
INH input for synchronizing OFF time
and latch circuit operation
SENS constant voltage control signal input
DRIVE Base drive current (ID) output
VIN supply voltage for control circuit
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