Datasheet > UC3827QTR-2

UC3827QTR-2

更新时间： 2024-09-26 23:38:59

品牌	Logo	应用领域
其他 - ETC		开关控制器
页数	文件大小	规格书
7页	117K
描述
Current/Voltage-Mode SMPS Controller

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中文翻译

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数据手册

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UC3827QTR-2 数据手册

UC1827-1/-2

UC2827-1/-2

UC3827-1/-2

Buck Current/Voltage Fed Push-Pull PWM Controllers

FEATURES

DESCRIPTION

• Ideal for Multiple Output and/or High

Voltage Output Voltage Converters

The UC3827 family of controller ICs provides an integrated control solution

for cascaded buck and push-pull converters. These converters are known

as current fed or voltage fed push-pull converters and are ideally suited for

multiple output and/or high voltage output applications. In both current fed

and voltage fed modes, the push-pull switches are driven at 50% nominal

duty cycles and at one half the switching frequency of the buck stage. In

the current fed mode, the two switches are driven with a guaranteed over-

lap period to prevent ringing and voltage stress on the devices. In the volt-

age fed mode, the two switches are driven with a guaranteed gap time

between the switches to prevent shorting the transformer across the en-

ergy storage capacitor and to prohibit excessive currents flowing through

the devices.

• Up to 500kHz Operation

• High Voltage, High Current Floating

Driver for Buck Converter Stage

• UC3827-1 Current Fed Controller has

Push-Pull Drivers with Overlapping

Conduction Periods

• UC3827-2 Voltage Fed Controller has

Push-Pull Drivers with

Non-overlapping Conduction Periods

The converter’s output voltage is regulated by pulse width modulation of

the buck switch. The UC3827 contains complete protection and PWM con-

trol functions for the buck converter. Easy control of the floating switch is

accomplished by the floating drive circuitry. The gate drive waveform is

level shifted to support an input voltage up to 72Vdc.

• Average Current Mode, Peak Current

Mode or Voltage Mode with Input

Voltage Feedforward Control for Buck

Power Stage

• Wide Bandwidth, Low Offset,

Differential Current Sense Amplifier

(continued)

• Precise Short Circuit Current Control

BLOCK DIAGRAM

VEAO

CEA+

CEAO

RAMP

VOLTAGE ERROR

AMPLIFIER

VEA+ 14

VEA– 16

CEA– 13

CURRENT

ERROR

AMPLIFIER

0.7V

PWM

COMPARATOR

CSAO

CSA+

CSA–

FLYING

DRIVER

V+

+3V

ILIM

COMPARATOR

BUCK

SRC

CURRENT

SENSE AMPLIFIER

OSC

INHBT

SYNC 19

CT 18

21 PGND

OSC

DELAY

500kHz

MAX

PUSH-PULL

DRIVERS

RT 17

REF 15

VCC 23

24 PUSH

22 PULL

REF

UVLO

DELAY

GND 11

UDG-97172

DELAY

04/99

12 3 4 5 6 7

中文翻译

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