TL1454

更新时间： 2024-11-24 22:42:11

品牌	Logo	应用领域
德州仪器 - TI		脉冲
页数	文件大小	规格书
24页	390K
描述
DUAL-CHANNEL PULSE-WIDTH-MODULATION (PWM) CONTROL CIRCUIT

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TL1454 数据手册

TL1454, TL1454Y

DUAL-CHANNEL PULSE-WIDTH-MODULATION (PWM)

CONTROL CIRCUIT

SLVS086B – APRIL 1995 – REVISED NOVEMBER 1997

D, N OR PW PACKAGE

(TOP VIEW)

Two Complete PWM Control Circuits

Outputs Drive MOSFETs Directly

Oscillator Frequency . . . 50 kHz to 2 MHz

3.6-V to 20-V Supply-Voltage Range

Low Supply Current . . . 3.5 mA Typ

Adjustable Dead-Time Control, 0% to 100%

1.25-V Reference

REF

SCP

DTC2

DTC1

IN1+

13 IN2+

IN2–

IN1–

COMP2

COMP1

GND

description

OUT2

OUT1

The TL1454 is a dual-channel pulse-width-modu-

lation (PWM) control circuit, primarily intended for

low-power, dc/dc converters. Applications include

LCD displays, backlight inverters, notebook com-

puters, and other products requiring small, high-frequency, dc/dc converters. Each PWM channel has its own

error amplifier, PWM comparator, dead-time control comparator, and MOSFET driver. The voltage reference,

oscillator, undervoltage lockout, and short-circuit protection are common to both channels.

Channel 1 is configured to drive n-channel MOSFETs in step-up or flyback converters, and channel 2 is

configured to drive p-channel MOSFETs in step-down or inverting converters. The operating frequency is set

with an external resistor and an external capacitor, and dead time is continuously adjustable from 0 to 100%

duty cycle with a resistive divider network. Soft start can be implemented by adding a capacitor to the dead-time

control (DTC) network. The error-amplifier common-mode input range includes ground, which allows the

TL1454 to be used in ground-sensing battery chargers as well as voltage converters.

AVAILABLE OPTIONS

†

PACKAGED DEVICES

CHIP FORM

(Y)

SMALL OUTLINE

(D)

PLASTIC DIP

(N)

TSSOP

(PW)

–20°C to 85°C

–40°C to 85°C

TL1454CD

TL1454ID

TL1454CN

TL1454IN

TL1454CPWLE

—

TL1454Y

—

†

The D package is available taped and reeled. Add the suffix R to the device name (e.g., TL1454CDR). The

PW package is available only left-end taped and reeled (indicated by the LE suffix on the device type; e.g.,

TL1454CPWLE).

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

^{POST OFFICE BOX 1443}• HOUSTON, TEXAS 77251–1443

12 3 4 5 6 7...24

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