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 lat...