TL494

HTC Korea TL494 incorporates on a single monolithic chip all the functions required in the construction of a pulse width modulation control circuit. Designed primarily for  power supply control, this device offers the systems engineer the flexibility to tailor the power supply control circuitry to one’s 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 precision regulator, and output-control circuits. 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 input to CT (pin 5), or it may be used to drive the common circuits in synchronous multiple-rail power supplies. The  uncommitted 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 function. The architecture of these devices prohibits the possibility of either output being pulsed twice during push-pull operation.

TL494 features :

• Complete PWM power control circuitry
• Uncommitted outputs for 200mA 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 5V reference supply
• Circuit architecture allows easy synchronization
• Available in SOP-16 and DIP-16 packages