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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
SYMBOL
DESCRIPTION
1
Collector
C
Collector of power Tr
2
Ground
GND
ground (Emitter of power Tr)
3
Base
B
Base of power Tr
4
Sink
SINK
Base current (IS) input
5
Over-current
OCP
over-current sensing signal input
protection
6
Inhibit
INH
input for synchronizing OFF time
Latch
and latch circuit operation
7
Sensing
SENS
constant voltage control signal input
8
Drive
DRIVE
Base drive current (ID) output
9
Vin
VIN
supply voltage for control circuit
