NCP1937
features necessary for building a robust and pact PFC stage while minimizing the number of external ponents.
The quasi- resonant current- mode flyback stage features a proprietary valley- lockout circuitry, ensuring stable valley switching. This system works down to the 4th valley and toggles to a frequency foldback mode with a minimum frequency clamp beyond the 4th valley to eliminate audible noise. Skip mode operation allows excellent efficiency in light load conditions while consuming very low standby power consumption. mon General Features
- Wide VCC Range from 9 V to 30 V with Built- in Overvoltage
Protection
- High- Voltage Startup Circuit and Active Input Filter Capacitor
Discharge Circuitry for Reduced Standby Power
- Integrated High- Voltage Brown- Out Detector
- Integrated High- Voltage Switch Disconnects PFC Feedback Resistor
Divider to Reduce Standby Power
- Fault Input for Severe Fault Conditions, NTC patible (Latch and
Auto- Recovery Options)
- 0.5 A / 0.8 A Source / Sink Gate...
