Texas Instruments UC3572 Negative Output Flyback Pulse Width Modulator UC3572N

The UC3572 is a negative output flyback pulse width modulator designed for converting a positive input voltage into a regulated negative output voltage. It is optimized for use in single inductor negative flyback switching converters and utilizes an external PMOS switch. Key features include an undervoltage lockout (UVLO) circuit to ensure sufficient input voltage before operation, pulse-by-pulse current limiting, and a low sleep mode current of 50¬µA, making it suitable for battery-powered applications. The device operates with a frequency range of 85 kHz to 115 kHz and supports a maximum duty cycle of 96%. It includes a precision reference and an error amplifier configured for voltage mode operation, along with a 0.5A peak gate driver. The UC3572 is available in multiple package types, including DIL-8 and SOIC-8, and is rated for operation from 0¬8C to 70¬8C. This product is ideal for engineers looking for a reliable solution for generating negative voltages in their designs.