Overview: KEC
m SEMICONDUCTOR KIA494AP/AF TECHNICAL DATA BIPOLAR LINEAR INTEGRATED CIRCUIT Voltage-Mode PWM Controller IC 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 or emitter-follower output capability. The KIA494AP/AF provides for push-pull or single-ended output operation, which may be selected through the output-control function.
The architecture of this device prohibits the possibility of either output being pulsed twice during push-pull operation. Ju DIM A B D d G H MILLIMETERS 19.3± 0.2 6.45+0.2 1.52± 0.1 0.46± 0.1 0 . 5 0 MIN 3.8± 0.3 L 3.3± 0.3 P 2.54 T 0.25+0.1/-0.05 W 7.
