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TL494IN

TITL494IN

Texas Instruments
Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull Regulator Positive Output Step-Up, Step-Down, Step-Up/Step-Down DC-DC Controller IC 16-PDIP
Active2,224 in stock
Datasheet Digi-Key Compare Prices

Overview

The TL494IN is a versatile pulse-width-modulation (PWM) control IC designed for a wide range of power supply architectures. It integrates all the essential functions for a complete PWM circuit, including an internal 5V regulator, two error amplifiers, an adjustable oscillator, and a dead-time control (DTC) comparator. The device supports various topologies such as buck, boost, half-bridge, and push-pull through its dual uncommitted output transistors.

Why Choose This Part

The TL494IN offers significant flexibility by allowing engineers to choose between single-ended or push-pull operation via its output control pin. It features a wide supply voltage range from 7V to 40V and dual 200mA outputs capable of either sourcing or sinking current. Additionally, the built-in dead-time control allows for precise management of switching overlap, preventing destructive cross-conduction in bridge topologies.

Applications

Desktop PC Power Supplies
Utilized in ATX and server power supplies to manage multiple output voltage rails with precise PWM control.
DC-DC Converters
Ideal for designing high-efficiency buck, boost, or flyback converters in industrial and consumer electronics.
Solar Micro-Inverters
Manages power conversion stages in small-scale renewable energy systems requiring stable frequency and duty cycle control.
AC-DC Adapters
Provides the primary control loop for isolated switching power supplies with wide input voltage ranges.

Key Specifications

Function Step-Up, Step-Down, Step-Up/Step-Down
Topology Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
Clock Sync No
Output Type Transistor Driver
Mounting Type Through Hole
Output Phases 1
Package / Case 16-DIP (0.300", 7.62mm)
Control Features Dead Time Control, Frequency Control
Duty Cycle (Max) 45%
Number of Outputs 2
Output Configuration Positive
Frequency - Switching 1kHz ~ 300kHz
Operating Temperature -40degC ~ 85degC (TA)
Synchronous Rectifier No
Supplier Device Package 16-PDIP
Voltage - Supply (Vcc/Vdd) 7V ~ 40V

Getting Started

To begin prototyping, the 16-PDIP through-hole package is ideal for breadboard use. Frequency is set by an external resistor (RT) and capacitor (CT) connected to pins 5 and 6. For high-power designs, ensure that the output transistors are properly biased to handle the required gate drive current for external MOSFETs or BJTs.

TL494 Family

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

Part Number Package Temp Range Stock
TL494IN (this part) DIP-16 -40degC ~ 85degC (.. 2,224
TL494CNSR SOIC-16 0degC ~ 70degC (TA) 6,035
TL494CPWR TSSOP-16 0degC ~ 70degC (TA) 4,040
TL494CN SOIC-16 0degC ~ 70degC (TA) 2,196
TL494IDR SOIC-16 -40degC ~ 85degC (.. 2,092
TL494CDR SOIC-16 0degC ~ 70degC (TA) 7,427