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UC2525AM

更新时间： 2024-09-15 02:58:47

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德州仪器 - TI		/
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描述
REGULATING PULSE WIDTH MODULATORS

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UC2525AM 数据手册

UC1525A, UC1527A

UC2525A, UC2527A

UC3525A, UC3527A

www.ti.com

SLUS191C–FEBRUARY 1997–REVISED JANUARY 2008

REGULATING PULSE WIDTH MODULATORS

FEATURES

DESCRIPTION

•

8-V to 35-V Operation

•

5.1-V Reference Trimmed to 1%

100-Hz to 500-kHz Oscillator Range

Separate Oscillator Sync Terminal

Adjustable Deadtime Control

Internal Soft-Start

The UC1525A/1527A series of pulse width modulator

integrated circuits are designed to offer improved

performance and lowered external parts count when

used in designing all types of switching power

supplies. The on-chip +5.1-V reference is trimmed to

1% and the input common-mode range of the error

amplifier includes the reference voltage, eliminating

external resistors. A sync input to the oscillator allows

multiple units to be slaved or a single unit to be

synchronized to an external system clock. A single

resistor between the C_Tand the discharge terminals

provides a wide range of dead-time adjustment.

These devices also feature built-in soft-start circuitry

with only an external timing capacitor required. A

shutdown terminal controls both the soft-start circuitry

and the output stages, providing instantaneous turn

off through the PWM latch with pulsed shutdown, as

well as soft-start recycle with longer shutdown

commands.

Pulse-by-Pulse Shutdown

Input Undervoltage Lockout With Hysteresis

Latching PWM to Prevent Multiple Pulses

Dual Source/Sink Output Drivers

BLOCK DIAGRAM

OSC

OUT

VREF

NOR

UVLO

Reference

Regulator

+VIN 15

Lockout

OUTPUT A

GROUND 12

To Internal

Circutry

SYNC

Flip

Flop

OSC

OUTPUT B

DISCHARGE

UC1525A

Output Stage

COMP

COMPENSATION 9

PWM

Latch

Error

Amp

OUTPUT A

REF

INV INPUT

NI INPUT

50 m

SOFTSTART

3 kW

SHUTDOWN 10

OUTPUT B

5 kW

UC1527A

Output Stage

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...17

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