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| TL494 |
Home > Products > Converter & Controller > TL494 |
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| Pulse-Width-Modulation Control Circuits |
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FEATURES |
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- 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
- Moisture Sensitivity Level 3 |
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DESCRIPTION |
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The TL494 incorporate on a single monolithic chip all the functions
required in the construction of a pulse-width-modulation control, |
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these devices offer the systems engineer the flexibility to tailor 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 R T (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. |
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Copyright  2008 TAEJIN TECHNOLOGY CO., LTD. All Rights Reserved |
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