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UC3572 - Negative Output Flyback Pulse Width Modulator

General Description

The UC3572 is a negative output flyback pulse width modulator which converts a positive input voltage to a regulated negative output voltage.

The chip is optimized for use in a single inductor negative flyback switching converter employing an external PMOS switch.

Key Features

  • Simple Single Inductor Flyback PWM for Negative Voltage Generation.
  • Drives External PMOS Switch.
  • Contains UVLO Circuit.
  • Includes Pulse-by-Pulse Current Limit.
  • Low 50µA Sleep Mode Current.

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Datasheet Details

Part number UC3572
Manufacturer Unitrode
File Size 283.91 KB
Description Negative Output Flyback Pulse Width Modulator
Datasheet download datasheet UC3572 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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Negative Output Flyback Pulse Width Modulator UC1572 UC2572 UC3572 FEATURES • Simple Single Inductor Flyback PWM for Negative Voltage Generation • Drives External PMOS Switch • Contains UVLO Circuit • Includes Pulse-by-Pulse Current Limit • Low 50µA Sleep Mode Current DESCRIPTION The UC3572 is a negative output flyback pulse width modulator which converts a positive input voltage to a regulated negative output voltage. The chip is optimized for use in a single inductor negative flyback switching converter employing an external PMOS switch. The block diagram consists of a precision reference, an error amplifier configured for voltage mode operation, an oscillator, a PWM comparator with latching logic, and a 0.5A peak gate driver.