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Qualified for Automotive Applications

Complete PWM Power Control Circuitry

Completely Synchronized Operation

Internal Undervoltage Lockout Protection

Wide Supply Voltage Range

Internal Short-Circuit Protection

Oscillator Frequency . . . 500 kHz Max

Variable Dead Time Provides Control Over

Total Range

Internal Regulator Provides a Stable 2.5-V

Reference Supply

Available in Q-Temp Automotive

HighRel Automotive Applications

Configuration Control / Print Support

Qualification to Automotive Standards

description

The TL1451A incorporates on a single monolithic chip all the functions required in the construction of two

pulse-width-modulation (PWM) control circuits. Designed primarily for power-supply control, the TL1451A

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 1.04 V to 1.45 V. The dead-time control (DTC)

comparator has no offset unless externally altered and can provide 0% to 100% dead time. The on-chip

oscillator can be operated by terminating RT and CT. During low VCC conditions, the undervoltage lockout

control circuit feature locks the outputs off until the internal circuitry is operational.

The TL1451A is characterized for operation from ?40°C to 125°C.