ST8107 18W Flyback Controller
Specifications
Product details
Overview
The ST8107 integrates a PWM controller with a 600V/2A, 700V/2A or 650V/2A high-voltage power MOSFET for cost-effective offline flyback converter applications in the 18W range. Standby power is very low (<100mW) when AC input is above 220Vac. The device offers complete protection coverage with automatic self-recovery, including cycle-by-cycle current limiting (OCP), CS short protection, over-load protection (OLP) and VDD under-voltage lockout (UVLO), plus latch or auto-recovery over-voltage protection (OVP, fixed or adjustable via an external Zener). Excellent EMI performance is achieved with frequency shuffling together with soft switching control at the totem-pole gate drive; tone energy below 20kHz is minimized so audio noise is eliminated during operation.
Features
- Power-on soft start reduces MOSFET VDS stress
- Frequency shuffling for improved EMI
- Audio-noise-free operation
- Extended burst mode control for improved efficiency and minimum standby power
- Internal synchronized slope compensation
- Fixed 65kHz switching frequency
- Comprehensive protection with auto self-recovery: VDD UVLO with hysteresis, cycle-by-cycle OCP for constant output power limiting over universal input, OLP with auto-recovery, VDD OVP with latch shutdown or auto-recovery, adjustable OVP via external Zener, CS floating and CS short protection
- Available in DIP8 package
Typical Applications
- Offline AC/DC flyback converters for switching power and battery chargers
- Digital camera and camcorder adapters
- Set-top box power supplies
- Auxiliary power for PC and server
- Open-frame SMPS
