FEATURES

· Controlled Baseline

– One Assembly/Test Site, One Fabrication

Site

· Enhanced Diminishing Manufacturing

Sources (DMS) Support

· Enhanced Product-Change Notification

· Qualification Pedigree (1)

· Complete Pulse-Width Modulation (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/ORDERING INFORMATION

The TL1451A-EP 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-EP

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-EP is characterized for operation from –55°C to 125°C.