NCP1235 - Fixed Frequency Current Mode Controller

onsemi

General Description

Pin No Pin Name Function 1 LATCH Latch Off Input 2 FB 3 CS Feedback Current Sense 4 GND 5 DRV 6 VCC Drive output VCC input Pin Description Pull the pin up or down to latch

off the controller.

Key Features

increases safety level of the final.

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NCP1235 fixed frequency current mode controller by onsemi - Datasheet Preview

Datasheet Details

Part number	NCP1235
Manufacturer	onsemi
File Size	239.85 KB
Description	Fixed Frequency Current Mode Controller
Datasheet	NCP1235 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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NCP1235 Product Preview Fixed Frequency Current Mode Controller for Flyback Converters The NCP1235 is a new fixed−frequency current−mode controller featuring Dynamic Self−Supply (DSS). This device is pin−to−pin compatible with the previous NCP12xx families. The DSS function greatly simplifies the design of the auxiliary supply and the VCC capacitor by activating the internal startup current source to supply the controller during transients. Due to frequency foldback, the controller exhibits excellent efficiency in light load condition while still achieving very low standby power consumption. Internal frequency jittering, ramp compensation, and a versatile latch input make this controller an excellent candidate for converters where components cost is the key constraints.