SMPS Controller Internal regulator provides stable reference supp
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TL494
SMPS Controller
Internal regulator provides stable reference supply trimmed Uncommitted output 200mA sink source current Output control push-pull single-ended operation Variable duty cycle dead time control (pin Complete control circuit On-chip oscillator with master slave operation Internal circuit prohibits double pulse either output
Description
TL494 used control circuit switching regulator. TL494 consists reference voltage circuit, error amplifiers, flip flop, output control circuit, comparator, dead time comparator oscillator. This device operated switching frequency KHz.
16-DIP
16-SOP
Internal Block Diagram
Rev.
©2000 Fairchild Semiconductor International
TL494
Absolute Maximum Ratings
Parameter Supply Voltage Collector Supply Voltage Output Current Amplifier Input Voltage Power Dissipation 25°C) Operating Temperature Range Storage Temperature Range Symbol TOPR TSTG Value (TL494CN) (TL494CD) Unit
TL494
Electrical Characteristics
(VCC 20V, 10KHz, 70°C, unless otherwise specified) Parameter REFERENCE SECTION Reference Output Voltage Line Regulation Temperature Coefficient VREF Load Regulation Short-Circuit Output Currnet OSCILLATOR SECTION Oscillation Frequency Frequency Change with Temperature DEAD TIME CONTROL SECTION Input Bias Current Maximum Duty Cycle Input Threshold Voltage ERROR SECTION Input Offset Voltage Input Offset Current Input Bias Current Common Mode Input Voltage Open-Loop Voltage Gain Unit-Gain Bandwidth COMPARATOR SECTION Input Threshold Voltage Input Sink Currnet OUTPUT SECTION Output Saturation Voltage Common Emitter Common Collector Collector Off-State Currnet Emitter Off-State Current TOTAL DEVICE Supply Current Rise Time Common Emitter Common Collector Fall Time Common Emitter Common Collector VREF, OUTPUT SWITCHING CHARACTERISTIC VCE(SAT) VCC(SAT) IC(OFF) IE(OFF) 200mA 15V, -200mA 40V, 40V, -100 VITH ISINK Zero Duty Cycle V3=0.7V -0.3 -0.7 IBIAS 2.5V 2.5V 2.5V 0.5V -0.3 IBIAS D(MAX) VITH 15V, 0VV45.25V 15V, VREF Zero Duty Cycle Max. Duty Cycle -2.0 0.01µF, 0.01µF, VREF VREF VREF/T VREF IREF 70°C IREF 10mA VREF 4.75 0.01 5.25 0.03 %/°C Symbol Conditions Min. Typ. Max. Unit
TL494
Typical Application
Pulse Width Modulated Step-down Converter
TL494
TL494
Mechanical Dimensions
Package
16-DIP
0.81 0.032 6.40 ±0.20 0.252 ±0.008
19.80 0.780
19.40 ±0.20 0.764 ±0.008
7.62 0.300
3.25 ±0.20 0.128 ±0.008
0.38 0.014
5.08 0.200
3.30 ±0.30 0.130 ±0.012
0~15°
0.25 -0.05 0.010 -0.002
+0.004
+0.10
2.54 0.100
0.46 ±0.10 0.018 ±0.004
1.50 ±0.10 0.059 ±0.004
TL494
Mechanical Dimensions (Continued)
Package
16-SOP
0.51 0.020 MAX0.10 MAX0.004 1.27 0.050 1.80 0.071 +0.10 0.406 -0.05 +0.004 0.016 -0.002 0.05 0.002
1.55 ±0.10 0.061 ±0.004
10.30 0.405 6.00 ±0.30 0.236 ±0.012 3.95 ±0.20 0.156 ±0.008
+0.10 0.20 -0.05 +0.004 0.008 -0.002
5.72 0.225 0.70 ±0.20 0.0275 ±0.008
9.90 ±0.20 0.39 ±0.008
TL494
Ordering Information
Product Number TL494CN TL494CD Package Operating Temperature 70°C
TL494
LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT FAIRCHILD SEMICONDUCTOR INTERNATIONAL. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user.
www.fairchildsemi.com 7/12/00 0.0m Stock#DSxxxxxxxx 2000 Fairchild Semiconductor International
critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness.
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