NCP1253BSN65T1G

AC DC Converters, Offline Switchers Overview

The NCP1253BSN65T1G is a current-mode PWM controller for off-line power supplies, manufactured by onsemi. It operates in flyback topology with a fixed switching frequency of 65 kHz and supports up to one output. The device features a maximum duty cycle of 84% and functions within an operating temperature range of -40°C to +125°C. Packaged in a TSOP-6 surface-mount format, it utilizes current-mode control architecture.

AC DC Converters, Offline Switchers Feature Summary

• Implements current-mode PWM control for off-line power supply applications
• Integrates proprietary over-power protection (OPP) requiring only two external resistors
• Includes combined latched over-voltage protection (OVP) and automatic recovery monitoring
• Features timer-based short-circuit protection independent of winding coupling

AC DC Converters, Offline Switchers Applications

• Offline AC-DC converters
• Flyback power supply designs
• Adapters and chargers

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'BSN65' confirms the 65 kHz switching frequency variant against the official datasheet. Ensure the TSOP-6 package dimensions match the target PCB footprint. Confirm RoHS compliance status through the manufacturer's certification documents prior to final procurement approval.

AC DC Converters, Offline Switchers Selection Notes

Select this component for compact offline designs requiring integrated over-power protection without secondary feedback complexity. The fixed 65 kHz frequency suits EMI-sensitive applications needing jitter optimization. Verify that the single-output flyback topology aligns with the system's isolation and voltage requirements.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP12510 series family of current-mode PWM controllers designed for high-performance offline power supplies. It shares architectural similarities with the NCP1251 but offers enhanced protection features like integrated OPP and OVP, enabling simpler implementation in space-constrained designs.

AC DC Converters, Offline Switchers Replacement Considerations

NCP1251ASN65T1G

AC DC Converters, Offline Switchers FAQ

How is over-power protection implemented?

Over-power protection is integrated using only two external resistors, allowing full utilization of maximum power without affecting standby performance.

What protection mechanisms are included?

The device includes latched over-voltage protection (OVP), automatic recovery OVP monitoring Vcc, and timer-based short-circuit protection.