Circuits. TL494 Datasheet

TL494 Datasheet PDF


Part

TL494

Description

Pulse-Width-Modulation Control Circuits

Manufacture

etcTI

Page 30 Pages
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TL494 Datasheet
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TL494
SLVS074H – JANUARY 1983 – REVISED MARCH 2017
TL494 Pulse-Width-Modulation Control Circuits
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 VCC – 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.
PART NUMBER
TL494
Device Information(1)
PACKAGE (PIN)
BODY SIZE
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
TL494
1 16
+
2 15
3 14
4
VREF
13
12
5
Osc
6
7
8
Control
11
10
9
1
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 Datasheet
TL494
SLVS074H – JANUARY 1983 – REVISED MARCH 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Simplified Block Diagram ..................................... 1
5 Revision History..................................................... 2
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings.............................................................. 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information .................................................. 4
7.5 Electrical Characteristics, Reference Section ........... 5
7.6 Electrical Characteristics, Oscillator Section............. 5
7.7 Electrical Characteristics, Error-Amplifier Section .... 5
7.8 Electrical Characteristics, Output Section................. 6
7.9 Electrical Characteristics, Dead-Time Control
Section ....................................................................... 6
7.10 Electrical Characteristics, PWM Comparator
Section ....................................................................... 6
7.11 Electrical Characteristics, Total Device................... 6
7.12 Switching Characteristics ........................................ 6
7.13 Typical Characteristics ............................................ 7
8 Parameter Measurement Information .................. 8
9 Detailed Description ............................................ 10
9.1 Overview ................................................................. 10
9.2 Functional Block Diagram ....................................... 10
9.3 Feature Description................................................. 10
9.4 Device Functional Modes........................................ 12
10 Application and Implementation........................ 13
10.1 Application Information.......................................... 13
10.2 Typical Application ............................................... 13
11 Power Supply Recommendations ..................... 20
12 Layout................................................................... 20
12.1 Layout Guidelines ................................................. 20
12.2 Layout Example .................................................... 21
13 Device and Documentation Support ................. 21
13.1 Trademarks ........................................................... 21
13.2 Electrostatic Discharge Caution ............................ 21
13.3 Glossary ................................................................ 21
14 Mechanical, Packaging, and Orderable
Information ........................................................... 21
5 Revision History
Changes from Revision G (January 2015) to Revision H
Page
• Updated package illustration .................................................................................................................................................. 1
• Corrected resistor polarity references in the Current-Limiting Amplifier section. ................................................................. 15
• Updated Figure 12. .............................................................................................................................................................. 15
Changes from Revision F (January 2014) to Revision G
Page
• Added Applications, Device Information table, Pin Functions table, ESD Ratings table, Thermal Information table, ,
Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply
Recommendations section, Layout section, Device and Documentation Support section, and Mechanical,
Packaging, and Orderable Information section. ..................................................................................................................... 1
Changes from Revision E (February 2005) to Revision F
Page
• Updated document to new TI data sheet format - no specification changes. ........................................................................ 1
• Removed Ordering Information table. .................................................................................................................................... 1
• Added ESD warning. ............................................................................................................................................................ 21
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Product Folder Links: TL494
Copyright © 1983–2017, Texas Instruments Incorporated


Features Datasheet pdf Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity TL494 SLVS074H – JANUARY 1983 – REVISED MARCH 2017 TL494 Pulse-Wid th-Modulation Control Circuits 1 Featu res •1 Complete PWM Power-Control Cir cuitry • Uncommitted Outputs for 200- mA Sink or Source Current • Output Co ntrol Selects Single-Ended or Push-Pull Operation • Internal Circuitry Prohi bits Double Pulse at Either Output • Variable Dead Time Provides Control Ove r Total Range • Internal Regulator Pr ovides a Stable 5-V Reference Supply Wi th 5% Tolerance • Circuit Architectur e Allows Easy Synchronization 2 Applica tions • Desktop PCs • Microwave Ove ns • Power Supplies: AC/DC, Isolated, With PFC, > 90 W • Server PSUs • S olar Micro-Inverters • Washing Machin es: Low-End and High-End • E-Bikes Power Supplies: AC/DC, Isolated, No P FC, < 90 W • Power: Telecom/Server AC /DC Supplies: Dual Controller: Analog Smoke Detectors • Solar Power Inverters 3 Description The TL494 device incorporates all the functi.
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