UC1638
UC2638
UC3638
DESCRIPTION (cont.)
ABSOLUTE MAXIMUM RATINGS
Supply Voltage VCC (referenced to VEE) . . . . . . . . . . . . . 40V
Output Drivers (AOUT2, BOUT2)
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).
±
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.
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.
CONNECTION DIAGRAMS
DIL-20 (Top View)
N or J Package
SOIC-20 (Top View)
DW Package
PLCC-20 (Top View)
Q Package
2
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