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UC1573 Scheda tecnica(PDF) 1 Page - Texas Instruments |
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UC1573 Scheda tecnica(HTML) 1 Page - Texas Instruments |
1 / 5 page UC1573 UC2573 UC3573 DESCRIPTION The UC3573 is a Buck pulse width modulator which steps down and regu- lates a positive input voltage. The chip is optimized for use in a single in- ductor buck switching converter employing an external PMOS switch. The block diagram consists of a precision reference, an error amplifier config- ured for voltage mode operation, an oscillator, a PWM comparator with latching logic, and a 0.5A peak gate driver. The UC3573 includes an undervoltage lockout circuit to insure sufficient input supply voltage is pres- ent before any switching activity can occur, and a pulse-by-pulse current limit. Input current can be sensed and limited to a user determined maxi- mum value. In addition, a sleep comparator interfaces to the UVLO circuit which turns the chip off when the input voltage is below the UVLO thresh- old. This reduces the supply current to only 50 µA, making the UC3573 ideal for battery powered applications. Buck Pulse Width Modulator Stepdown Voltage Regulator FEATURES • Simple Single Inductor Buck PWM Stepdown Voltage Regulation • Drives External PMOS Switch • Contains UVLO Circuit • Includes Pulse-by-Pulse Current Limit • Low 50µA Sleep Mode Current SLUS346 - APRIL 1999 BLOCK DIAGRAM UDG-94106-1 |
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