NCP1236AD100R2G

AC DC Converters, Offline Switchers Overview

The NCP1236AD100R2G is a fixed-frequency current-mode switching controller designed for flyback converter topologies. Manufactured by onsemi, this component operates at a switching frequency of 100 kHz with a maximum duty cycle of 85%. It features a dynamic self-supply (DSS) function to simplify auxiliary power design and includes internal frequency jittering and ramp compensation. The device supports a maximum operating supply voltage of 28 V and delivers an output current capability of 500 mA. It functions within a temperature range of -40°C to +125°C and is housed in a compact SOIC-7 surface-mount package.

AC DC Converters, Offline Switchers Feature Summary

• Dynamic self-supply (DSS) functionality activates an internal startup current source during transients to maintain controller operation without complex auxiliary circuits.
• Integrated frequency foldback mechanism ensures high efficiency under light load conditions while maintaining very low standby power consumption.
• Internal frequency jittering reduces electromagnetic interference (EMI) noise peaks inherent in fixed-frequency switching operations.
• Versatile latch input provides robust protection against fault conditions through customizable shutdown logic.

AC DC Converters, Offline Switchers Applications

• AC to DC switching converters
• Flyback power supply designs
• Switching mode power supply controllers

AC DC Converters, Offline Switchers Procurement Notes

Verify the lifecycle status before integration, as the component is marked NRND (Not Recommended for New Designs). Confirm that the SOIC-7 package and 100 kHz frequency align with existing schematic requirements. Ensure compatibility with the specific flyback topology constraints. Review the official datasheet for any updates regarding pinout or electrical characteristics prior to finalizing the bill of materials.

AC DC Converters, Offline Switchers Selection Notes

Select this controller when designing cost-sensitive flyback converters requiring fixed-frequency current-mode control. The DSS feature is advantageous for simplifying VCC capacitor sizing and auxiliary winding designs. Consider the 100 kHz frequency trade-off between component size and switching losses. Verify that the 85% maximum duty cycle meets the required input-to-output voltage conversion ratio for the target application.

AC DC Converters, Offline Switchers Part Context

This part belongs to the NCP1236 series of fixed-frequency current-mode controllers from onsemi. It is pin-to-pin compatible with previous NCP12xx family members, facilitating direct upgrades or replacements in legacy designs. The series focuses on reducing component count and improving efficiency in offline power applications through integrated protection and soft-start features.

AC DC Converters, Offline Switchers Replacement Considerations

The NCP1236BD100R2G is a confirmed substitute within the same series, offering identical functionality but potentially differing in specific ordering suffixes or minor manufacturing variations. Verify pin compatibility and electrical specifications against the original design requirements before substitution.