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TL494CN

TITL494CN

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
Active2,196 in stock
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Overview

The TL494CN is a versatile pulse-width-modulation (PWM) control circuit designed specifically for power-supply control. It incorporates all the functions required in the construction of a pulse-width-modulation control circuit on a single chip, including a 5-V reference, two error amplifiers, and an adjustable oscillator. The device can be configured for single-ended or push-pull operation through an output-control function.

Why Choose This Part

The TL494CN offers an integrated architecture that prohibits double pulses at either output and provides a stable 5-V reference with 5% tolerance. Its flexibility is a major benefit, allowing for 200-mA sink or source current and adjustable dead time across the entire range to protect power transistors.

Applications

Push-Pull Converters
The uncommitted outputs and push-pull control logic make it ideal for driving dual-transistor push-pull power stages.
Half-Bridge/Full-Bridge Converters
Utilized in switch-mode power supplies (SMPS) where variable dead-time control is critical to prevent cross-conduction.
Voltage Regulators
Suitable for buck, boost, and flyback topologies requiring a stable 5-V reference and PWM control.
Battery Chargers
Used in lead-acid and lithium-ion charging circuits that require precise constant-voltage or constant-current 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 (0.209", 5.30mm 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-SO
Voltage - Supply (Vcc/Vdd) 7V ~ 40V

Getting Started

When designing with the TL494CN, begin by selecting the timing components (RT and CT) for the internal oscillator to set the desired switching frequency. Ensure the dead-time control (DTC) pin is biased correctly to prevent overlap in push-pull configurations, and utilize the two internal error amplifiers for voltage and current feedback loops. Breadboarding is straightforward due to the 16-pin PDIP package.

TL494 Family

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

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