NCP1253ASN100T1G

AC DC Converters, Offline Switchers Overview

The NCP1253ASN100T1G is a current-mode PWM controller for offline power supplies, featuring a fixed 100 kHz switching frequency. It operates within a Vcc supply range up to 28 V and utilizes a TSOP-6 package. The device supports flyback topology with a maximum duty cycle of 84%. It includes an internally fixed 4 ms soft-start timer and offers adjustable slope compensation via the current sense signal. The controller provides auto-recovery timer-based short-circuit protection and latched overvoltage protection on the Vcc pin.

AC DC Converters, Offline Switchers Feature Summary

• Integrates jittered 100 kHz switching circuitry operated in peak current mode control
• Automatically folds back switching frequency down to 26 kHz during light load conditions
• Includes internally fixed 4 ms soft-start timer for controlled startup sequences
• Provides latched overvoltage protection on the Vcc pin to safeguard against optocoupler destruction

AC DC Converters, Offline Switchers Applications

• AC-DC converters for TVs
• Set-top boxes
• Printers
• Offline adapters for notebooks
• Offline adapters for netbooks

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'ASN100' confirms the 100 kHz fixed frequency variant, as other suffixes like 'CSN65' indicate different frequencies. Ensure the TSOP-6 package type matches the design requirements. Confirm RoHS compliance status through official documentation before procurement. Validate that the 28 V Vcc operation limit aligns with the target power supply design constraints.

AC DC Converters, Offline Switchers Selection Notes

Select this component when a rugged, high-performance offline power supply solution is required in a compact TSOP-6 package. It is suitable for applications demanding extremely low no-load standby power consumption. The adjustable slope compensation feature allows optimization for continuous conduction mode operations to avoid subharmonic oscillations. Consider the 100 kHz frequency for balancing size and efficiency needs.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP1253 series of current-mode PWM controllers designed for off-line power supplies. The series is characterized by its ability to deliver high performance in a tiny footprint. Variants within the series differ primarily in their fixed switching frequencies, such as 65 kHz or 100 kHz options, allowing designers to tailor electromagnetic interference profiles and transformer sizes accordingly.

AC DC Converters, Offline Switchers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.