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TL494CDR

TITL494CDR

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-SOIC
NRND7,427 in stock
Datasheet Digi-Key Mouser Compare Prices

Overview

The TL494CDR is a versatile pulse-width-modulation (PWM) control IC designed for fixed-frequency power supply circuits. It incorporates all the functions required for the construction of a PWM control circuit on a single chip, including an internal 5V reference and uncommitted output transistors for flexibility in various power topologies. The device supports single-ended or push-pull operation through an output-control function.

Why Choose This Part

The architecture offers significant flexibility with uncommitted transistors capable of 200mA sink or source current. Precise dead-time control is adjustable over the entire duty cycle range to prevent cross-conduction in power stages. Additionally, the internal circuitry automatically prohibits double pulses at either output, ensuring reliable operation in high-stress switching environments.

Applications

Push-Pull Converters
Utilizes dual uncommitted outputs and internal flip-flop logic to prevent double pulses in high-efficiency push-pull power stages.
Half-Bridge and Full-Bridge Power Supplies
Provides necessary dead-time control and transistor drive capability for managing bridge-based DC-DC conversion.
Buck and Boost Regulators
Configurable for standard step-up or step-down topologies by utilizing the internal error amplifiers and PWM comparator.
Forward and Flyback Converters
Supports isolated power supply designs requiring precise frequency control and secondary-side PWM regulation.

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 Surface Mount
Output Phases 1
Package / Case 16-SOIC (0.154", 3.90mm Width)
Control Features Dead Time Control, Frequency Control
Duty Cycle (Max) 45%
Number of Outputs 2
Output Configuration Positive
Frequency - Switching 1kHz ~ 300kHz
Operating Temperature 0degC ~ 70degC (TA)
Synchronous Rectifier No
Supplier Device Package 16-SOIC
Voltage - Supply (Vcc/Vdd) 7V ~ 40V

Getting Started

To begin development, calculate the timing components for the internal oscillator using the formula found in the datasheet to set your desired switching frequency. Ensure the dead-time control (DTC) pin is biased correctly to provide the necessary guard interval for your switching MOSFETs or BJTs. Evaluation can be performed on a standard breadboard or protoboard using the 16-SOIC package with an adapter, or by integrating it into a custom PCB design.

TL494 Family

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

Part Number Package Temp Range Stock
TL494CDR (this part) SOIC-16 0degC ~ 70degC (TA) 7,427
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
TL494IN DIP-16 -40degC ~ 85degC (.. 2,224