PL494 Datasheet | PAIHAUNG

PL494 Revised Date : 2007/11/20 Page No. : 1/14 PULSE-WIDTH-MODULATION CONTROL CIRCUITS ˙plete PWM Power Control Circuitry ˙Unmitted 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 With 5% Tolerance ˙Circuit Architecture Allows Easy Synchronization Description PLASTIC PACKAGE DIP-16 PLASTIC PACKAGE SO-16 The PL494 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 PL494 contains two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) parator , a pulse-steering control flip-flop, a 5-V, 5%precision regulator, and output-control circuits. PIN CONNECTIONS The error amplifiers exhibit a mon-mode voltage range from - 0.3V to Vcc - 2V. The dead-time control parator 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 mon circuits in synchronous multiple-rail power supplies. (TOP VIEW) FUNCTION TABLE INPUT TO OUTPUT CTRL OUTPUT FUNCTION VI=GND VI=Vref Single-ended or parallel output Normal push-pull operation PL494 PAIHAUNG Product Specification PL494 Revised Date : 2007/11/20 Page No. : 2/14 Description (continued) The unmitted output transistors provide either mon-emitter or...