Daewoo DTR-14D3VG, Service Manual

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STR-S6708 (Hybrid IC for a Switching Regulator)
(1) General Description
The STR-S6708 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
No. of Terminal Symbol Description Function
1 C Collector Terminal P Tr Collector
2 GND Ground Terminal Ground (P Tr Emitter)
3 B Base Terminal P Tr Base
4 SINK Sink Terminal Base Current (I B2) input
5 DRIVE Drive Terminal Base Drive Current (I B1) Output
6 OCP Overcurrent Protection Overcurrent Sensing Signal Input
Terminal
7 F/B Feedback Terminal Constant voltage Control Signal Input
8 INH Inhibit Terminal off Time Synchronizing
Latch Terminal Latch Circuit Operation Signal Input
9 VIN VIN Terminal Control Circuit Power Supply Input