XR-494

XR-494 Pulse-Width Modulating Regulator GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM The XR-494 is a monolithic pulse width modulating regulator designed to contain all the blocks necessary for a switching regulator. Included in a 16 pin dual in-line package is a voltage reference, oscillator, control logic, error amplifiers, and dual uncommitted outputs. This device can be used for switching regulators of either polarity, polarity converters, transformer coupled DC to DC converters, transformerless voltage doublers, and many other power control applications. The XR-494M is fully specified for operation over the full military tem- perature range from - 55°C to + 125°C, while the XR- 494CN and XR-494CP are designed for commercial ap- plications over O°C to + 70°C. FEED BACK DEAO TIME CONTROL 4 I---! f-----f' 'NV INPUT REF OUT OUTPUT CONTROL FEATURES Complete PWM Power Control Circuitry Uncommitted Outputs for 200-mA Sink or Source Output Control Selects Single-Ended or Push...