TL494 Motorola, TL494 Datasheet
TL494
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TL494 Summary of contents
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... 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– ...
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... 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 – ...
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... 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 – ...
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... 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 ...
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... 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 ...
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... 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– ...
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... 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% ...
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... 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 ...
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... 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 ...
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... 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. ...
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... 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– ...
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... 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 ...