UC1572 Datasheet

IC型號(hào)：
UC1572
PDF描述：
Negative Output Flyback Pulse Width Modulator
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131.73KB
PDF頁數(shù)：
5頁
芯片廠家：
TI

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UC1572

UC2572

UC3572

Negative Output Flyback Pulse Width Modulator

FEATURES

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Simple Single Inductor Flyback PWM

for Negative Voltage Generation

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Drives External PMOS Switch

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Contains UVLO Circuit

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Includes Pulse-by-Pulse Current Limit

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Low 50碌A(chǔ) Sleep Mode Current

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

converter employing an external PMOS switch. The block diagram consists

of a precision reference, an error amplifier configured for voltage mode op-

eration, 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 activ-

ity 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 50碌A(chǔ), making the UC3572 ideal

for battery powered applications.

BLOCK DIAGRAM

UDG-94094-2

03/99

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