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UC3572 Datasheet(PDF) 1 Page - Texas Instruments |
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UC3572 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 9 page UC1572 UC2572 UC3572 DESCRIPTION The UC3572 is a negative output flyback pulse width modulator which con- verts a positive input voltage to a regulated negative output voltage. The chip is optimized for use in a single inductor negative flyback switching con- verter employing an external PMOS switch. The block diagram consists of a precision reference, an error amplifier configured for voltage mode opera- tion, an oscillator, a PWM comparator with latching logic, and a 0.5A peak gate driver. The UC3572 includes an undervoltage lockout circuit to insure sufficient input supply voltage is present before any switching activity can occur, and a pulse-by-pulse current limit. Output current can be sensed and limited to a user determined maximum value. The UVLO circuit turns the chip off when the input voltage is below the UVLO threshold. In addition, a sleep comparator interfaces to the UVLO circuit to turn the chip off. This re- duces the supply current to only 50 µA, making the UC3572 ideal for battery powered applications. Negative Output Flyback Pulse Width Modulator 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 SLUS275A - MARCH 1999 - REVISED AUGUST 2001 BLOCK DIAGRAM UDG-94094-2 |
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