XR-494
XR-494 is Pulse-Width Modulating Regulator manufactured by Exar.
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 unmitted 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 mercial ap- plications over O°C to + 70°C.
FEED BACK
DEAO
TIME CONTROL
4 I---! f-----f'
'NV INPUT
REF OUT
OUTPUT CONTROL
FEATURES plete PWM Power Control Circuitry Unmitted Outputs for 200-m A Sink or Source Output Control Selects Single-Ended or...
