NCP1377PG

AC DC Converters, Offline Switchers Overview

The NCP1377PG is a quasi-resonant current mode PWM controller designed for flyback topologies. It integrates a true current mode modulator and demagnetization detector to ensure boundary or critical conduction mode operation with minimal drain voltage switching. The device features an internal 8.0µs timer that prevents idle frequency from exceeding 150 kHz, adhering to CISPR-22 EMI limits. It supports burst mode operation at low peak currents to eliminate audible noise. Key specifications include a 100 kHz switching frequency, 18 V output voltage capability, and 500 mA output current drive. It operates within a temperature range of -25°C to +125°C in a PDIP-7 package.

AC DC Converters, Offline Switchers Feature Summary

• Integrates a true current mode modulator and demagnetization detector for efficient quasi-resonant operation.
• Features an internal timer to limit idle frequency and comply with EMI standards.
• Includes fast overvoltage protection via auxiliary winding detection with permanent latch-off.
• Provides automatic recovery from short-circuit faults through safe burst mode.

AC DC Converters, Offline Switchers Applications

• Offline power supplies requiring quasi-resonant flyback topology
• Adapters and chargers needing low standby power consumption
• General purpose AC/DC conversion systems

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix PG indicates the PDIP-7 through-hole package configuration. Confirm the component status as discontinued or end-of-life before finalizing design-in decisions. Ensure compatibility with existing PCB footprints if replacing active inventory. Check for any product change notifications regarding material composition or manufacturing site changes.

AC DC Converters, Offline Switchers Selection Notes

Select this controller for applications prioritizing reduced electromagnetic interference through variable frequency skip-cycle regulation. It is suitable for designs requiring robust overvoltage protection and silent operation at light loads. Consider the PDIP-7 package constraints for thermal management and assembly methods compared to surface-mount alternatives.

AC DC Converters, Offline Switchers Part Context

This component belongs to the NCP1377 series of offline controllers manufactured by onsemi. It is part of the PMIC - Power Management ICs subcategory under Switching Controllers. The series is designed for high-efficiency power conversion with integrated protection features.

AC DC Converters, Offline Switchers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify cross-reference availability through official manufacturer channels.