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Complete PWM Power Control Circuitry

Completely Synchronized Operation

Internal Undervoltage Lockout Protection

Wide Supply Voltage Range

Oscillator Frequency . . . 500 kHz Max

Variable Dead Time Provides Control

Over Total Range

Internal Regulator Provides a Stable 2.5-V

Reference Supply

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.