UC3832DWG4                 DESCRIPTION

The UC2832 and UC3833 series of precision linear regulators include all the control functions required in the design of very low dropout linear regulators Additionally, they feature an innovative duty-ratio current limiting technique which provides peak load capability while limiting the average power dissipa tion of the external pass transistor during fault conditions.When the load cur- rent reaches an accurately programmed threshold a gated-astable timer is enabled,which switches the regulator’s pass device off and on at an externally programmable duty-ratio. During the on-time of the pass element the output current is limited to a value slightly higher than the trip threshold of the duty-ra tio timer.The constant-current-limit is programmable on the UCx832 to allow higher peak current during the on-time of the pass device.ith duty-ratio con- trol. high in iia load demands and short circuit protection may both be accom- modated without extra heat sinking or fold back current limiting.Additionally,it the timer pin is grounded,the duty-ratio timer is disabled and the IC operates in constant-voltage/constant-current regulating mode.

UC3832DWG4             FEATURES

Precision 1%Reference

Over-Current Sense Threshold

Accurateto5%

Programmable Duty-Ratio

Over-Current Protection

4.5Vto 36 VOperation

100mAOutput DriveSourceor

Sink

Under-Voltage Lockout

Additional Features of the UC2832 series:

Adjustable Current Limit to

Current Sense Ratio

Separate+VIN terminal

Programmable Driver Current

Limit

Access to VrEF and E/A(+) Logic-Level Disable Input

UC3832DWG4             Applications

? U.P.S.

? Welding

? Solar Inverter

? Induction Heating