NCP1216P133

AC DC Converters, Offline Switchers Overview

The NCP1216P133 is a current mode PWM switching controller designed for offline flyback power supplies. It operates at a fixed switching frequency of 133 kHz and supports a maximum duty cycle of 46.5%. The device features an internal high-voltage startup circuit, eliminating the need for auxiliary windings. It includes comprehensive protection mechanisms such as cycle-by-cycle current limiting, output overvoltage lockout, thermal shutdown, and open-loop detection. The component is housed in a 7-pin PDIP package and is rated for operation within a junction temperature range of 0°C to +150°C.

AC DC Converters, Offline Switchers Feature Summary

• Integrated high-voltage startup circuit for simplified transformer design
• Current mode control with cycle-by-cycle peak current limiting
• Built-in thermal shutdown and output overvoltage lockout protection

AC DC Converters, Offline Switchers Applications

• Offline flyback converters for AC-DC power adapters
• Low-power consumer electronics power supplies
• Standby power supplies for televisions and monitors

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix against official onsemi documentation to confirm pinout compatibility and electrical tolerances. Confirm RoHS compliance status and lead times directly with authorized distributors, as availability may vary by region. Ensure the ordering part number matches the exact voltage and frequency specifications required for your design.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring a fixed-frequency flyback topology without auxiliary winding complexity. It is suitable for applications needing robust protection features integrated into a single IC. Consider the 133 kHz frequency for balancing efficiency and EMI performance in low-to-medium power ranges.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP1216 family of current mode PWM controllers from onsemi. These devices are engineered for cost-effective, high-reliability offline power supply solutions. The family shares common architectural features but varies in switching frequency and packaging options to suit different application constraints.

AC DC Converters, Offline Switchers Replacement Considerations

NCP1216AP133G

AC DC Converters, Offline Switchers FAQ

Does the NCP1216P133 require an auxiliary winding?

No, it features an integrated high-voltage startup circuit that eliminates the need for an auxiliary winding during startup.

What protection features are included?

It includes cycle-by-cycle current limiting, output overvoltage lockout, thermal shutdown, and open-loop detection.