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| www.fairchildsemi.com TL494 SMPS Controller Features * Internal regulator provides a stable 5V reference supply trimmed to 5% * Uncommitted output TR for 200mA sink or source current * Output control for push-pull or single-ended operation * Variable duty cycle by dead time control (pin 4) Complete PWM control circuit * On-chip oscillator with master or slave operation * Internal circuit prohibits double pulse at either output 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 control 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-DIP 1 16-SOP 1 Internal Block Diagram Rev. 5.0 (c)2000 Fairchild Semiconductor International TL494 Absolute Maximum Ratings Parameter Supply Voltage Collector Supply Voltage Output Current Amplifier Input Voltage Power Dissipation (TA = 25C) Operating Temperature Range Storage Temperature Range Symbol VCC VC IO VIN PD TOPR TSTG Value 42 42 250 VCC + 0.3 1 (TL494CN) 0.9 (TL494CD) 0 ~ +70 -65 ~ + 150 Unit V V mA V W C C 2 TL494 Electrical Characteristics (VCC = 20V, f = 10KHz, TA = 0C to + 70C, unless otherwise specified) Parameter REFERENCE SECTION Reference Output Voltage Line Regulation Temperature Coefficient of 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 AMP SECTION Input Offset Voltage Input Offset Current Input Bias Current Common Mode Input Voltage Open-Loop Voltage Gain Unit-Gain Bandwidth PWM 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 ICC tR tF Pin 6 = VREF, VCC = 15V 6 100 100 25 40 10 200 200 100 100 mA ns ns OUTPUT SWITCHING CHARACTERISTIC VCE(SAT) VCC(SAT) IC(OFF) IE(OFF) VE = 0, IC = 200mA VC = 15V, IE = -200mA VCC = 40V, VCE = 40V VCC = VC = 40V, VE = 0 1.1 1.5 2 1.3 2.5 100 -100 V A VITH ISINK Zero Duty Cycle V3=0.7V -0.3 4 -0.7 4.5 V mV VIO IIO IBIAS VCM GVO BW V3 = 2.5V V3 = 2.5V V3 = 2.5V 7V VCC 40V 0.5V V3 3 .5V -0.3 70 2.0 25 0.2 95 650 10 250 1.0 VCC mV mA A V dB KHz IBIAS D(MAX) VITH VCC = 15V, 0VV45.25V VCC = 15V, V4 = 0V O.C Pin = VREF Zero Duty Cycle Max. Duty Cycle 45 0 -2.0 3.0 -10 3.3 A % V f f/T CT = 0.01F, RT = 12K CT = 0.01F, RT = 12K 10 2 KHz % VREF VREF VREF/T VREF ISC IREF = 1mA VCC = 7V to 40V TA = 0C to 70C IREF = 1mA to 10mA VREF = 0V 4.75 10 5.0 2.0 0.01 1.0 35 5.25 25 0.03 15 50 V mV %/C mV mA Symbol Conditions Min. Typ. Max. Unit 3 TL494 Typical Application Pulse Width Modulated Step-down Converter TL494 4 TL494 Mechanical Dimensions Package 16-DIP 0.81 ) 0.032 #16 ( #1 6.40 0.20 0.252 0.008 19.80 MAX 0.780 19.40 0.20 0.764 0.008 #8 #9 7.62 0.300 3.25 0.20 0.128 0.008 0.38 0.014 MIN 5.08 MAX 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 5 TL494 Mechanical Dimensions (Continued) Package 16-SOP MIN 0.51 ) 0.020 MAX0.10 MAX0.004 1.27 0.050 1.80 MAX 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 #1 #16 10.30 MAX 0.405 #8 #9 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 6 0~ 8 9.90 0.20 0.39 0.008 TL494 Ordering Information Product Number TL494CN TL494CD Package 16 DIP 16 SOP Operating Temperature 0 ~ + 70C 7 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, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. www.fairchildsemi.com 7/12/00 0.0m 001 Stock#DSxxxxxxxx 2000 Fairchild Semiconductor International 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. |
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