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See Technical Specifications

UC2572D

Negative output Flyback pulse width modulator

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

UC2572D
Datasheet:

UC2572D Datasheet (PDF)
Output Type:

Transistor Driver
Function:

Step-Up/Step-Down
Output Configuration:

Negative
Topology:

Flyback
EDA/CAD Models:

Request Free CAD Models for UC2572D

Email: [email protected]

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Tel: +852 95804164

UC2572D 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. 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. 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 reduces the supply current to only 50uA, making the UC3572 ideal for battery powered applications.

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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 50uA Sleep Mode Current

Specifications

Category	Integrated Circuits (ICs)Power Management (PMIC)DC DC Switching Controllers	Series	-
Output Type	Transistor Driver	Function	Step-Up/Step-Down
Output Configuration	Negative	Topology	Flyback
Number of Outputs	1	Output Phases	1
Voltage - Supply (Vcc/Vdd)	4.75V ~ 30V	Frequency - Switching	100kHz
Duty Cycle (Max)	92%	Synchronous Rectifier	No
Clock Sync	No	Serial Interfaces	-
Control Features	Current Limit, Ramp	Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Base Product Number	UC2572