NCP1201D100R2

AC DC Converters, Offline Switchers Overview

The NCP1201D100R2 is an offline switch controller designed for flyback converter topologies. It operates at a fixed switching frequency of 100 kHz and supports a maximum duty cycle of 83%. The device features a breakdown voltage of 500V and requires a maximum supply voltage of 16V. It is housed in an 8-SOIC package with a width of 3.90mm. The component provides fault protection against overload, overtemperature, and short circuits. It functions within a junction temperature range of -40°C to 150°C.

AC DC Converters, Offline Switchers Feature Summary

• Implements current-mode control for universal off-line supplies to enhance audio-susceptibility and provide inherent pulse-by-pulse control.
• Features skip cycle mode that automatically activates when load current diminishes, ensuring excellent efficiency under light load conditions.
• Includes robust fault protection circuitry that permanently disables output pulses during faults such as failed optocouplers or overcurrent conditions.
• Supplies itself from the high-voltage rail, eliminating the need for an auxiliary winding in battery charger applications.

AC DC Converters, Offline Switchers Applications

• Universal off-line AC-DC adapters
• Battery chargers
• Switchmode power supplies (SMPS) requiring low standby power

AC DC Converters, Offline Switchers Procurement Notes

Verify the specific suffix D100R2 to confirm the 100 kHz switching frequency variant. Confirm RoHS compliance status as documentation indicates non-compliance for this specific part number. Check for obsolescence notices as the product status is listed as expired. Ensure the 8-SOIC package dimensions match the design footprint requirements.

AC DC Converters, Offline Switchers Selection Notes

Select this component for designs requiring fixed-frequency current-mode control without internal switches. Consider the 500V breakdown voltage for appropriate isolation requirements. Evaluate the self-supply capability from the high-voltage rail to simplify transformer design by removing auxiliary windings. Verify thermal management capabilities given the wide operating temperature range up to 150°C TJ.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP1201 family of PWM current-mode controllers. It is distinct from integrated switcher variants like the NCP1012 series which include internal MOSFETs. The NCP1201 is a controller only, requiring an external power switch. It shares architectural similarities with the NCP1200 but offers specific frequency and voltage ratings defined by its suffix codes.

AC DC Converters, Offline Switchers Replacement Considerations

NCP1201D60R2 serves as a functional substitute with identical specifications except for a 60 kHz switching frequency. NCP1200AD100R2G is a related controller in the same family but may have different voltage or current handling characteristics. Verify pin compatibility and electrical parameters before substitution.

AC DC Converters, Offline Switchers FAQ

Does the NCP1201D100R2 include an internal power switch?

No, it is a controller only and requires an external power switch.

How does the device handle light load conditions?

It enters a skip cycle mode when load current falls below a setpoint to maintain high efficiency.

What happens if a fault occurs?

The controller permanently disables output pulses until the mains power is cycled.