2

UC1638

UC2638

UC3638

UC1638

UC2638

UC3638

ABSOLUTE MAXIMUM RATINGS

for the highside switches in a full bridge configuration.

The programmable AREFIN pin allows for single or dual

supply operation. Oscillator ramp amplitude and PWM

deadband are programmable by tapping a voltage di-

vider off the 5V reference to the appropriate program-

ming input (PVSET or DB).

Additional features include a precision externally avail-

able 5V reference, undervoltage lockout, pulse-by-pulse

peak current limiting, and a remote shutdown port. The

UC1638 family is available in the 20 pin N, DW and J

packages. Consult the factory for other packaging op-

tions.

Supply Voltage VCC (referenced to VEE) .............40V

Output Drivers (AOUT2, BOUT2)

Currents (continuous) ........................

±0.25A

Currents (peak) ............................

±500mA

REF Output Current .................... Internally Limited

PVSET, DB, RT, INV, REF, CSOUT .............0.3 to 10V

CS+, CS- ............................. VEE–1V to VCC

CT, AREF, AREFIN, COMP, SD ................VEE

− 0.3

Output Voltage (AOUT1, BOUT1) ....................60V

Storage temperature ....................

−65°C to +150°C

Junction Temperature ...................

−55°C to +150°C

Lead temperature (soldering, 10 sec.) .............. +300°C

Currents are positive into, negative out of the specified termi-

nal. Consult packaging section of data book for thermal limita-

tion considerations of packages.

DESCRIPTION (cont.)

CONNECTION DIAGRAMS

DIL-20 (Top View)

NorJPackage

SOIC-20 (Top View)

DW Package

PLCC-20 (Top View)

Q Package