TITL494IDR

Overview

The TL494IDR is a versatile pulse-width-modulation (PWM) control IC designed for a wide range of power conversion architectures including push-pull, bridge, and single-ended configurations. It integrates two error amplifiers, an adjustable oscillator, a dead-time control (DTC) comparator, and a pulse-steering control flip-flop on a single monolithic chip. This controller is a classic industry standard for designing regulated power supplies that require precise PWM control with minimal external components.

Why Choose This Part

The device offers significant flexibility with uncommitted output transistors capable of sourcing or sinking 200mA, allowing for both common-emitter and emitter-follower configurations. It includes built-in dead-time control to prevent cross-conduction in half-bridge and full-bridge topologies, and its internal 5V reference supply ensures stability across an operating temperature range of -40C to 85C.

Applications

Getting Started

To begin development, consult the Texas Instruments datasheet to calculate the timing resistor (Rt) and timing capacitor (Ct) for your desired switching frequency. Prototype your design using a standard 16-SOIC breakout board or a custom PCB, ensuring that the ground plane is robust to minimize switching noise in the error amplifiers. For testing, monitor the dead-time control pin (DTC) to ensure adequate blanking time between switching phases in push-pull modes.

TL494 Family

Comparing specs that differ across variants. The current part is highlighted.