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ICE3BS03LJG / 3BS3LJ SOP-8 Flyback Power Switch Controller IC (2pcs)
ICE3BS03LJG / 3BS3LJ SOP-8 Flyback Power Switch Controller IC (2pcs)
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ICE3BS03LJG / 3BS3LJ — SOP-8 Flyback Power Switch Controller IC
The ICE3BS03LJG (also marked 3BS3LJ) is an Infineon CoolSET® integrated flyback controller combining a PWM controller and a 650V N-channel MOSFET in a single SOP-8 package. Designed for low-power offline flyback SMPS, it's widely used in LCD monitor standby power supplies and auxiliary power stages. This listing provides 2 pieces — new and original.
Key Specifications
| Parameter | Value |
|---|---|
| Part Numbers | ICE3BS03LJG / 3BS3LJ |
| Package | SOP-8 |
| Integrated MOSFET | 650V N-channel (built-in) |
| Drain Current (ID) | 0.3A (continuous) |
| Switching Frequency | Fixed 65kHz |
| Startup Current | <200μA |
| Burst Mode | Yes (light-load efficiency) |
| Protections | OVP, OCP, OTP, SCP, auto-restart |
| Vcc Range | 10V – 23V |
| Operating Temperature | -25°C to +125°C |
| Quantity | 2 PCS |
Why Choose ICE3BS03LJG?
- ✅ Integrated MOSFET — no external power switch needed, reduces BOM and PCB area
- ✅ Burst mode — ultra-low standby power (<1W) for energy efficiency compliance
- ✅ Auto-restart protection — safe recovery from fault conditions without manual reset
- ✅ Infineon CoolSET® — proven reliability in millions of LCD monitor PSUs
- ✅ New & original — genuine Infineon parts for reliable repair
Compatible With / Works With
- LCD monitor standby/auxiliary power supply boards (5VSB rail)
- LCD TV standby power stage (3.3VSB / 5VSB)
- Low-power offline flyback adapters (<10W output)
- Flyback transformers: EE13, EE16, EI19 cores
- Optocoupler feedback: PC817 + TL431 secondary regulation
Typical Applications
- LCD Monitor Standby PSU — 5VSB rail generation in 17–27" monitor power boards
- LCD TV Auxiliary Power — 3.3VSB / 5VSB for TV microcontroller and IR receiver
- Low-Power Offline Flyback — <10W isolated power supply for industrial controls
- USB Charger Design — 5V/1A isolated flyback with ICE3BS03LJG
FAQ
Q: What does "3BS3LJ" marking mean on the IC?
A: "3BS3LJ" is the abbreviated date/lot code marking used on the SOP-8 package. It corresponds to ICE3BS03LJG — the full part number from Infineon.
Q: Can ICE3BS03LJG replace ICE3BS02LJG or ICE3BS04LJG?
A: These are the same CoolSET® family with different MOSFET current ratings (02=0.2A, 03=0.3A, 04=0.4A). Pinout is identical — use a higher-rated variant (04LJG) as a direct upgrade if the original is marginal.
Q: How do I diagnose a failed ICE3BS03LJG?
A: Check for: no Vcc startup voltage, MOSFET drain shorted to source (measure D-S resistance), or no switching waveform on drain. A shorted internal MOSFET is the most common failure mode.
Package Contents
- 2× ICE3BS03LJG / 3BS3LJ SOP-8 Flyback Power Switch Controller IC
