Update: 29 September, 2023
The NCP1200 is a PWM current-mode controller designed for low-power universal off-line supplies. It allows the implementation of a complete offline battery charger or a standby SMPS with few external components due to its novel concept. The integrated output short-circuit protection enables the designer to build an extremely low-cost AC-DC wall adapter with a simplified feedback scheme. The controller operates at a fixed frequency of 40 kHz, 60 kHz, or 100 kHz and drives low gate-charge switching devices like an IGBT or a MOSFET, requiring very small operating power. The NCP1200 simplifies the design of reliable and cheap offline converters with low acoustic generation and pulse-by-pulse control thanks to its current-mode control. When the current setpoint falls below a certain value, such as when the output power demand decreases, the IC automatically enters the skip cycle mode, providing excellent efficiency at light loads. This occurs at low peak current, resulting in no acoustic noise. The IC is self-supplied from the DC rail, eliminating the need for an auxiliary winding and ensuring operation even in the presence of low output voltage or shorts.
File format: PDF
Size: -
MD5 Checksum: 6CFE4E953C22555E027640A0E49E4187
Publication date: 08 May, 2012
Downloads: -
PDF Link: ON Semiconductor NCP1200 handbook PDF