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User Programmable
Maximum PWM
Duty Cycle
100碌A(chǔ) Startup Current
Operation to 1MHz
Internal Full Cycle
Soft Start
Internal Leading Edge
Blanking of Current
Sense Signal
1 Amp Totem Pole
Output
DESCRIPTION
The UCC3807 family of high speed, low power integrated circuits contains all of the
control and drive circuitry required for off-line and DC-to-DC fixed frequency current
mode switching power supplies with minimal external parts count.
These devices are similar to the UCC3800 family, but with the added feature of a
user programmable maximum duty cycle. Oscillator frequency and maximum duty
cycle are programmed with two resistors and a capacitor. The UCC3807 family also
features internal full cycle soft start and internal leading edge blanking of the cur-
rent sense input.
The UCC3807 family offers a variety of package options, temperature range
options, and choice of critical voltage levels. The family has UVLO thresholds and
hysteresis levels for off-line and battery powered systems. Thresholds are shown in
the table below.
Part Number
UCCx807-1
UCCx807-2
UCCx807-3
Turn-on Threshold
7.2V
12.5V
4.3V
Turn-off Threshold
6.9V
8.3V
4.1V
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BLOCK DIAGRAM
UDG-95001-1
SLUS163 - JUNE 1997
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