GL494 PDF Datasheet


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Description

This is PWM CONTROL CIRCUIT. GL494 GL494 PWM CONTROL CIRCUIT Description The GL494 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, the GL494 contains an on-chip 5-volt regulator, two error amplifiers, adjustable oscillator, deadtime control comparator, pulse-steering flip-flop, and output-control circuitry. The uncommitted output transistors pro-vide either common-emitter or emitterfollower output capability. Push-pull or single-ended output operation may be selected through the outputcontrol function. The ar-chitecture of the GL494 prohibits the possibility of either output being pulsed twice during push-pull operation. Pin Configuration NONINV INPUT INV. INPUT FEEDBACK DEAD TIME CONTROL Cr Rr GND C1 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 NON INV INPUT INV. INPUT REF. OUT OUTPUT CONTROL Vcc C2 E2 E1 Features Complete PWM Power Control Circuitry Uncommitted Outputs for 200mA S.