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 passelementthe 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 onthe UCx832 to allow higher peak current during the on-time of the pass device.ith duty-ratio con- trol. high iniia load demands and short circuit protection may both be accom- modated without extra heat sinking or foldbackcurrent limiting.Additionally,it the timer pin is grounded,the duty-ratio timer is disabledand 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
