TL1451AC, TL1451AY DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024C - FEBRUARY 1983 - REVISED OCTOBER 1995

features

• 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

description

The TL1451AC 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 TL1451AC 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 V_CC conditions, the undervoltage lockout control circuit feature locks the outputs off until the internal circuitry is operational.

The TL1451AC is characterized for operation from -20°C to 85°C.

View more information about generic part numbers:TL1451A

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