NCP1254ASN65T1G

AC DC Converters, Offline Switchers Overview

The NCP1254ASN65T1G is a highly integrated PWM controller for offline flyback power supplies, housed in a TSOP-6 package. It operates with a fixed 65 kHz switching frequency and supports a supply voltage range up to 28 V. The device features peak current mode control with a maximum duty cycle of 80%. It includes integrated protections such as overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown. The component is designed for high performance in compact applications, offering robust operation across an extended temperature range.

AC DC Converters, Offline Switchers Feature Summary

• Highly integrated PWM controller optimized for offline flyback topologies
• Fixed 65 kHz switching frequency for EMI optimization
• Peak current mode control architecture
• Integrated overvoltage and overcurrent protection mechanisms

AC DC Converters, Offline Switchers Applications

• Offline flyback power converters
• AC-DC adapter designs
• Low-power isolated power supplies

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix 'ASN65' confirms the 65 kHz fixed frequency variant. Confirm the TSOP-6 package dimensions match your PCB footprint requirements. Check the manufacturer status as some listings indicate this part may be obsolete or end-of-life; ensure availability from authorized distributors before finalizing design-in decisions.

AC DC Converters, Offline Switchers Selection Notes

Select this component when a fixed 65 kHz frequency is required for simplified EMI filter design. It is suitable for applications needing peak current mode control without external compensation complexity. Ensure the input voltage range and output power requirements align with the controller's capabilities within the TSOP-6 form factor constraints.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP125x family of current-mode PWM controllers from onsemi. These devices are designed to replace discrete solutions in low-to-medium power offline applications. The NCP1254 specifically offers a fixed frequency option, distinguishing it from variable frequency counterparts in the same series.

AC DC Converters, Offline Switchers Replacement Considerations

Direct substitutes include other NCP125x variants with compatible pinouts and frequencies, such as NCP1251ASN65T1G if frequency matching is critical. Verify electrical parameters and package compatibility before substitution.