NCP1377BPG

The NCP1377BPG from ON Semiconductor is a PWM Current-Mode Controller engineered for free-running quasi-resonant operation. This controller integrates a true current mode modulator and a demagnetization detector, ensuring borderline/critical conduction mode across various load and line conditions with minimum drain voltage switching. Its inherent skip cycle capability allows it to enter burst mode at low power demands, preventing audible noise. The NCP1377B version features a reduced internal timer duration of 3.0 µs, enabling operation at higher frequencies up to 300 kHz.

Key features include latched overvoltage protection, auto-recovery short-circuit protection via UVLO crossover, and external latch triggering capabilities. It also incorporates an internal 1.0 ms soft-start to eliminate startup stress and internal temperature shutdown for protection. The device offers a 500 mA peak current source/sink capability and direct optocoupler connection. It is available in SOIC-7, SOIC-8, and PDIP-7 packages, making it suitable for AC-DC adapters, offline battery chargers, and consumer electronics.

This controller is designed for applications requiring efficient power conversion, such as AC-DC adapters for notebooks, offline battery chargers, and auxiliary power supplies for consumer electronics like DVD players and set-top boxes. Its robust protection features and operational modes contribute to reliable and efficient power management solutions.