TI-TL494.pdf
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V
REF
Osc
Control
TL494
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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
TL494
SLVS074H –JANUARY 1983–REVISED MARCH 2017
TL494 Pulse-Width-Modulation Control Circuits
1
1 Features
1
• Complete PWM Power-Control Circuitry
• Uncommitted Outputs for 200-mA Sink or
Source Current
• Output Control Selects Single-Ended or
Push-Pull Operation
• Internal Circuitry Prohibits Double Pulse at
Either Output
• Variable Dead Time Provides Control Over
Total Range
• Internal Regulator Provides a Stable 5-V
Reference Supply With 5% Tolerance
• Circuit Architecture Allows Easy Synchronization
2 Applications
• Desktop PCs
• Microwave Ovens
• Power Supplies: AC/DC, Isolated,
With PFC, > 90 W
• Server PSUs
• Solar Micro-Inverters
• Washing Machines: Low-End and High-End
• E-Bikes
• Power Supplies: AC/DC, Isolated,
No PFC, < 90 W
• Power: Telecom/Server AC/DC Supplies:
Dual Controller: Analog
• Smoke Detectors
• Solar Power Inverters
3 Description
The TL494 device incorporates all the functions
required in the construction of a pulse-width-
modulation (PWM) control circuit on a single chip.
Designed primarily for power-supply control, this
device offers the flexibility to tailor the power-supply
control circuitry to a specific application.
The TL494 device contains two error amplifiers, an
on-chip adjustable oscillator, a dead-time control
(DTC) comparator, a pulse-steering control flip-flop, a
5-V, 5%-precision regulator, and output-control
circuits.
The error amplifiers exhibit a common-mode voltage
range from –0.3 V to V
CC
– 2 V. The dead-time
control comparator has a fixed offset that provides
approximately 5% dead time. The on-chip oscillator
can be bypassed by terminating RT to the reference
output and providing a sawtooth input to CT, or it can
drive the common circuits in synchronous multiple-rail
power supplies.
The uncommitted output transistors provide either
common-emitter or emitter-follower output capability.
The TL494 device provides for push-pull or single-
ended output operation, which can be selected
through the output-control function. The architecture
of this device prohibits the possibility of either output
being pulsed twice during push-pull operation.
The TL494C device is characterized for operation
from 0°C to 70°C. The TL494I device is characterized
for operation from –40°C to 85°C.
Device Information
(1)
PART NUMBER PACKAGE (PIN) BODY SIZE
TL494
SOIC (16) 9.90 mm × 3.91 mm
PDIP (16) 19.30 mm × 6.35 mm
SOP (16) 10.30 mm × 5.30 mm
TSSOP (16) 5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4 Simplified Block Diagram
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