TL494 Fairchild Semiconductor, TL494 Datasheet

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TL494

Manufacturer Part Number
TL494
Description
Manufacturer
Fairchild Semiconductor
Datasheet

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Features
• Internal regulator provides a stable 5V reference supply
• Uncommitted output TR for 200mA sink or source
• Output control for push-pull or single-ended operation
• Variable duty cycle by dead time control (pin 4) Complete
• On-chip oscillator with master or slave operation
• Internal circuit prohibits double pulse at either output
Internal Block Diagram
©2000 Fairchild Semiconductor International
TL494
SMPS Controller
trimmed to 5%
current
PWM control circuit
Description
The TL494 is used for the control circuit of the PWM
switching regulator. The TL494 consists of 5V reference
voltage circuit, two error amplifiers, flip flop, an output con-
trol circuit, a PWM comparator, a dead time comparator and
an oscillator. This device can be operated in the switching
frequency of 1 KHz to 300 KHz.
16-SOP
16-DIP
1
1
www.fairchildsemi.com
Rev. 5.0

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TL494 Summary of contents

Page 1

... Internal Block Diagram ©2000 Fairchild Semiconductor International www.fairchildsemi.com Description The TL494 is used for the control circuit of the PWM switching regulator. The TL494 consists of 5V reference voltage circuit, two error amplifiers, flip flop, an output con- trol circuit, a PWM comparator, a dead time comparator and an oscillator ...

Page 2

... TL494 Absolute Maximum Ratings Parameter Supply Voltage Collector Supply Voltage Output Current Amplifier Input Voltage Power Dissipation ( Operating Temperature Range Storage Temperature Range 2 Symbol Value 250 0 (TL494CN 0.9 (TL494CD +70 OPR T - 150 STG Unit ...

Page 3

... V = 40V C(OFF 40V, V E(OFF Pin REF Min. Typ. Max. 4.75 5.0 5. 0.01 0. 5.25V - -2.0 - 3 250 - 0.2 1.0 -0 650 - - 4 4.5 -0.3 -0 1.1 1.3 - 1.5 2 100 = -100 E = 15V - 100 200 - 100 200 - - - - 25 100 - 40 100 TL494 Unit KHz % KHz ...

Page 4

... TL494 Typical Application Pulse Width Modulated Step-down Converter 4 TL494 ...

Page 5

... Mechanical Dimensions Package 6.40 0.20 0.252 0.008 #1 #8 7.62 0.300 16-DIP #16 #9 3.25 0.20 0.128 0.008 5.08 MAX 0.200 TL494 0.38 MIN 0.014 3.30 0.30 0.130 0.012 5 ...

Page 6

... TL494 Mechanical Dimensions Package #1 #8 0.236 3.95 0.156 0.70 0.20 0.0275 0.008 6 (Continued) 16-SOP MIN 1.55 0.061 #16 #9 6.00 0.30 1.80 0.071 0.012 0.20 0.008 5.72 0.225 0.05 0.002 0.10 0.004 MAX ...

Page 7

... Ordering Information Product Number TL494CN TL494CD Package Operating Temperature 16 DIP SOP TL494 7 ...

Page 8

... TL494 LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR INTERNATIONAL. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, ...

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