NCP1200A is a PWM current-mode controller for universal off-line supplies featuring low standby power.
The NCP1200A is a miniature PWM controller designed for high-power AC-DC wall adapters and offline battery chargers. It operates with an internal structure at fixed frequencies of 40 kHz, 60 kHz, or 100 kHz, supplying itself from the high-voltage rail to eliminate the need for an auxiliary winding.
The device features current-mode control with skip-cycle capability to ensure excellent efficiency at light loads without acoustic noise. It includes efficient protective circuitry such as auto-recovery internal output short-circuit protection and internal temperature shutdown.
| Operating Frequency Options | 40 kHz, 60 kHz, or 100 kHz |
|---|---|
| Peak Current Capability | 250 mA |
| Maximum Junction Temperature | 150 °C |
| Temperature Shutdown Threshold | 145 °C |
| Power Supply Voltage (Vcc) | 16 V |
No, it operates without an auxiliary winding by supplying itself from the high-voltage rail.
The IC automatically enters skip cycle mode to provide excellent efficiency at light loads.
No, because the skip cycle occurs at a user adjustable low peak current, no acoustic noise takes place.