Texas Instruments TL1453C Data Handbook

查询TL1453供应商 TL1453C

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUIT

SLVS039A – FEBRUARY 1990 – REVISED DECEMBER 1990

Complete PWM Power Control Circuitry N OR NS PACKAGE (T0P VIEW)

Completely Synchronized Operation Internal Undervoltage Lockout Protection REF

Wide Supply Voltage Range RT SCP ERROR IN+ IN+ ERROR

Oscillator Frequency 500 k Hz Max

AMPLIFIER 1 IN– IN– AMPLIFIER 2

Variable Dead Time Provides Control

1 FEEDBACK 2 FEEDBACK

Over Total Range

1 DEAD-TIME CONTROL 2 DEAD-TIME CONTROL

Internal Regulator Provides a Stable 2.5-V

1 OUTPUT 2 OUTPUT

Reference Supply

GND VCC

description The TL1453C incorporates the functions required in the construction of two pulse-width-modulation control circuits on a single monolithic chip. Designed primarily for power supply control, the TL1453C contains an on-chip 2.5-V regulator, two error amplifiers, an adjustable oscillator, two dead-time comparators, undervoltage lockout circuitry, and dual common-emitter output transistor circuits. The uncommitted output transistors provide common-emitter output capability for each controller. The internal amplifiers exhibit a common-mode voltage range from 1.05 V to 1.45 V. The dead-time control comparator has no offset unless externally altered and may be used to provide 0% to 100% dead time. The on-chip oscillator may be operated by terminating RT (pin 2) and CT (pin 1). During low-VCC conditions, the undervoltage lockout control circuit feature inhibits the output until the internal circuitry is operational. The TL1453C is characterized for operation from –20°C to 85°C.

functional block diagram

VCC CT RT

Vref = 2.5 V

Reference Triangle

Voltage Oscillator

Error Amp.1 1.4 V PWM Comparator 1

1 IN+

1 OUTPUT

1 IN–

1 FEEDBACK

Error Amp.2

2 FEEDBACK

2 IN+

2 OUTPUT

2 IN–

PWM Comparator 2

SCP UVLO†

1 DEAD-TIME CONTROL 2 DEAD-TIME CONTROL

UVLO = Undervoltage Lockout Protection

Copyright  1990, Texas Instruments Incorporated 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.

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