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TL494D датащи(PDF) 1 Page - HTC Korea TAEJIN Technology Co. |
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TL494D датащи(HTML) 1 Page - HTC Korea TAEJIN Technology Co. |
1 / 6 page Pulse-Width-Modulation Control Circuits TL494 FEATURES ● Complete PWM Power Control Circuitry ● Uncommitted Outputs for 200 Ma Sink or Source Current ● Output Control Selects Single-Ended or Push-Pull Operation ● Internal Circuitry Prohibits Double Pulse at Either Output ● Variable Dead-Time Provides Control over Total Range ● Internal Regulator Provides a Stable 5-V Reference Supply,5% ● Circuit Architecture Allows Easy Synchronization DESCRIPTION The TL494 incorporate on a single monolithic chip all the functions required in the construction of a pulse-width-modulation control, these devices offer the systems engineer the flexibility to tailor ORDERING INFORMATION the power supply control circuitry to his application. The TL494 contains an error amplifier, an on-chip adjustable oscillator, a dead-time control comparator, pulse-steering control flip-flop, a 5-volt, 5% precision regulator, and output-control circuit. The error amplifier exhibits a common-mode voltage range from -0.3 volts to Vcc -2 volts. The dead-time control comparator has a fixed offset that provides approximately 5% dead time when externally altered. The on-chip oscillator may be bypassed by terminating RT (pin 6) to the reference output and providing a sawtooth in put to CT (pin 5), or it may be used to drive the common circuits in synchronous multiple-rail power supplies. The uncommited output transistors provide either common-emitter or emitter-follower output capability. Each Device provides for push-pull or single-ended output operation, which may be selected through the output-control funct -ion. The architecture of these devices prohibits the possibility of either output being pulsed twice during push -pull operation. Functional Block Diagram HTC TL494N 18 DIP Device Package TL494D 16 SOP 145 Mar. 2006-Rev06 SOP16/DIP16 (TOP VIEW) 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 NONINV INPUT INV INPUT FEEDBACK DEAD-TIME CONTROL CT RT GND C1 NONINV INPUT INV INPUT REF OUT Vcc C2 E2 E1 OUTPUT CONTROL Error AMP 1 Error AMP 2 OSCILLATOR REFERENCE RT CT DEAD TIME CONTROL 0.1V DEAD-TIME CONTROL COMPARATOR PWM COMPARATOR FEEDBACK ERROR AMPLIFIER ERROR AMPLIFIER NONINVERTING INPUT INVERTING INPUT NONINVERTING INPUT INVERTING INPUT + - 2 1 + - C1 PULSE-STEERING FLIP-FLOP Q1 Q2 C1 E1 C2 E2 Vcc Vref GND OUTPUT CONTROL |
Аналогичный номер детали - TL494D |
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Аналогичное описание - TL494D |
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