This is a kind of Controller.
Part Number: 3S111
Function: Power PWM Controller IC for LCD Chip
Package: SOP 7 Pin Type
Manufacturer: Sanken, Samsung
Image
Description
This IC is TV for LCD Power Manage IC. The 3S111 is a PWM controller IC from Sanken, primarily designed for switch-mode power supply (SMPS) applications in LCD TVs. It integrates multiple protection and control functions required for stable and efficient power conversion, typically used in flyback or forward converter topologies.
Key Features
- PWM control for SMPS applications
- Designed for LCD TV power management
- Startup and soft-start control
- Low external component count
Pinout
1. FB/OLP
2. BD
3. NC
4. ST
5. DRV
6. OCP
7. VCC
8. GND
Design Considerations
- Startup Circuit: Ensure proper VCC charging via startup resistor or auxiliary winding
- Current Sensing: Accurate sense resistor critical for OCP stability
- Feedback Loop: Compensation network must ensure loop stability
- EMI Control: Proper snubber and layout required
- Thermal: External MOSFET and transformer dominate thermal design
Applications
- LCD TV power supplies
- SMPS adapters
- Set-top box power modules
- General isolated AC-DC converters
Other data sheets are available within the file: SSC3S111
3S111 Datasheet PDF
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