ON NCP1200A handbook(2)
Update: 30 September, 2023
NCP1200A is a PWM current-mode controller that can achieve low standby power for universal offline power supplies. It is housed in SOIC-8 or PDIP-8 package, and can reduce optocoupler current while increasing drive capability. Due to its novel concept, the circuit can implement complete offline AC-DC adapters, battery charger or a SMPS where standby power is a key parameter. The controller operates at a fixed 40 kHz, 60 kHz or 100 kHz, and supplies itself from the high-voltage rail, avoiding the need for an auxiliary winding. This feature naturally eases the designer's task in battery charger applications. Finally, current-mode control provides an excellent audio-susceptibility and inherent pulse-by-pulse control. When the current setpoint falls below a given value, e.g. the output power demand diminishes, the IC automatically enters the so-called skip cycle mode and provides excellent efficiency at light loads. Because this occurs at a user adjustable low peak current, no acoustic noise takes place. The NCP1200A features an efficient protective circuitry which, in presence of an overcurrent condition, disables the output pulses while the device enters a safe burst mode, trying to restart. Once the default has gone, the device auto-recovers.
Brand: ON
File format: PDF
Size: 186 KB
MD5 Checksum: 1F2E1E33976FD3D8EE5D37C1124C8FA3
Publication date: 10 July, 2012
Downloads: -
PDF Link: ON NCP1200A handbook(2) PDF