TL494 Motorola, TL494 Datasheet

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TL494

Manufacturer Part Number
TL494
Description
Manufacturer
Motorola
Datasheet

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0
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TL494C
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ST
0
SWITCHMODE Pulse Width
Modulation Control Circuit
designed primarily for SWITCHMODE power supply control.
NOTE: 1. Maximum thermal limits must be observed.
MAXIMUM RATINGS
unless otherwise noted.)
MOTOROLA ANALOG IC DEVICE DATA
Power Supply Voltage
Collector Output Voltage
Collector Output Current
Amplifier Input Voltage Range
Power Dissipation @ T A
Thermal Resistance,
Operating Junction Temperature
Storage Temperature Range
Operating Ambient Temperature Range
Derating Ambient Temperature
The TL494 is a fixed frequency, pulse width modulation control circuit
Complete Pulse Width Modulation Control Circuitry
On–Chip Oscillator with Master or Slave Operation
On–Chip Error Amplifiers
On–Chip 5.0 V Reference
Adjustable Deadtime Control
Uncommitted Output Transistors Rated to 500 mA Source or Sink
Output Control for Push–Pull or Single–Ended Operation
Undervoltage Lockout
(Each transistor) (Note 1)
Junction–to–Ambient
TL494C
TL494I
Rating
(Full operating ambient temperature range applies,
45 C
I C1 , I C2
Symbol
R JA
V C1 ,
V CC
V C2
T stg
V IR
P D
T J
T A
T A
TL494C
–55 to +125
–0.3 to +42
– 25 to +85
0 to +70
1000
500
125
42
42
80
45
TL494I
Unit
mW
mA
C/W
V
V
V
C
C
C
C
TL494CD
TL494CN
TL494IN
Motorola, Inc. 1996
PULSE WIDTH MODULATION
Device
Compen/PWN
Comp Input
Deadtime
Control
Ground
Noninv
ORDERING INFORMATION
CONTROL CIRCUIT
Input
Input
Inv
C T
R T
C1
SWITCHMODE
SEMICONDUCTOR
Temperature Range
T A = – 25 to +85 C
TECHNICAL DATA
PIN CONNECTIONS
1
2
3
4
5
6
7
8
T A = 0 to +70 C
TL494
Order this document by TL494/D
Operating
+
Error
Amp
0.1 V
Oscillator
1
(Top View)
Q1
V CC
PLASTIC PACKAGE
PLASTIC PACKAGE
2 Error
5.0 V
Amp
REF
CASE 751B
D SUFFIX
N SUFFIX
CASE 648
+
(SO–16)
Q2
16
15
14
13
12
10
11
9
Package
SO–16
Plastic
Plastic
Noninv
Input
Inv
Input
V ref
Output
Control
V CC
C2
E2
E1
Rev 1
1

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TL494 Summary of contents

Page 1

... SWITCHMODE Pulse Width Modulation Control Circuit The TL494 is a fixed frequency, pulse width modulation control circuit designed primarily for SWITCHMODE power supply control. Complete Pulse Width Modulation Control Circuitry On–Chip Oscillator with Master or Slave Operation On–Chip Error Amplifiers On–Chip 5.0 V Reference Adjustable Deadtime Control Uncommitted Output Transistors Rated to 500 mA Source or Sink Output Control for Push– ...

Page 2

... Common–Emitter (See Figure 12) Emitter–Follower (See Figure 13) Output Voltage Fall Time Common–Emitter (See Figure 12) Emitter–Follower (See Figure 13) NOTE: 2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. 2 TL494 Symbol Min Typ – ...

Page 3

... Average Supply Current ( 0. (Pin (See Figure 12) * Standard deviation is a measure of the statistical distribution about the mean as derived from the formula, MOTOROLA ANALOG IC DEVICE DATA TL494 Symbol Min Typ V IO – 2 – ...

Page 4

... Feedback PWM 1 Comparator Input Capacitor C T Feedback/PWM Comp. Deadtime Control Flip–Flop Clock Input Flip–Flop Q Flip–Flop Q Output Q1 Emitter Output Q2 Emitter Output Control 4 TL494 Figure 1. Representative Block Diagram Output Control Flip– Deadtime Flop Comparator Ck Q – + – – + PWM + 4 ...

Page 5

... The output frequency will now be equal to that of the oscillator. The TL494 has an internal 5.0 V reference capable of sourcing load current for external bias circuits. The reference has an internal accuracy of typical thermal drift of less than 50 mV over an operating temperature range ...

Page 6

... 1.0 2 DEADTIME CONTROL VOLTAGE (IV) Figure 8. Common–Emitter Configuration Output Saturation Voltage versus Collector Current 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0 100 200 COLLECTOR CURRENT (mA) 6 TL494 Figure 5. Percent Deadtime versus 8.0 100 6.0 120 4.0 140 2.0 160 180 0 100 k 1.0 M 500 k 1.0 k Figure 7. Emitter– ...

Page 7

... C Each C L Output Q 15pF Transistor E 90 MOTOROLA ANALOG IC DEVICE DATA TL494 Figure 11. Deadtime and Feedback Control Circuit Test Inputs Feedback Terminal (Pin 3) 50k Figure 13. Emitter–Follower Configuration Test Circuit and Waveform V C Each Output Transistor 10% 10% ...

Page 8

... Max Time, each output 45 – Figure 17. Output Connections for Single–Ended and Push–Pull Configurations Output Control Single–Ended 0 TL494 Output 2 ref Output 1 ...

Page 9

... Load Regulation 1 1.0 A Output Ripple 1.0 A Short Circuit Current 0.1 Efficiency 1.0 A MOTOROLA ANALOG IC DEVICE DATA TL494 Figure 19. Operation with V in > Using > 40V Master Slave (Additional Circuits ...

Page 10

... Figure 21. Pulse Width Modulated Step–Down Converter + 10V to 40V TL494 50V D.T. O.C. Gnd 0.001 47k Test Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency 10 TL494 Tip 32A 150 47k 0 1. Comp 2 – 5. ref 15 – 5. ...

Page 11

... G K –T– SEATING PLANE 0.25 (0.010 MOTOROLA ANALOG IC DEVICE DATA TL494 OUTLINE DIMENSIONS N SUFFIX PLASTIC PACKAGE CASE 648–08 ISSUE SEATING –T– PLANE SUFFIX PLASTIC PACKAGE CASE 751B– ...

Page 12

... JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center, 3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–81–3521–8315 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298 *TL494/D* MOTOROLA ANALOG IC DEVICE DATA TL494/D ...

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