KEC KIA494AP/P

The KIA494AP/AF incorporates on a single monolithic chip all the functions required in the construction of a pulse-widthmodulation control circuit. Designed primarily for power supply control, this device offers the systems engineer the flexibility to tailor the power supply control circuitry to a specific application. The KIA494AP/AF contains two error amplifiers, an on-chip adjustable oscillator, a dead-tme control(DTC) comparator, a pulse-steering control flip-flop, a 5-V 5%-precision requlator, and output-control circuits. The error amplifiers exhibit a common-mode voltage range from -0.3V to VCC -2V. The dead-time control comparator has a fixed offset that provides approximately 5% dead time. The on-chip oscillator may be bypassed by terminating RT to the reference output and providing a sawtooth input to CT, or it may drive the common circuits in synchronous multiplerail power supplies. The uncommitted output transistors provide either commonemitter 0r emitter-follower output capability. The KIA494AP/AF provides for push-pull or single-ended output operation, which maybe selectedthroughthe output-control function. The architecture of this device prohibits the possibility of either output being pulsed twice during push-pull operation.

• Completed 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 With 5% Tolerance.
• Circuit Architecture Allows Easy Synchronization.