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Forward Technique for Off-Line Voltage Mode Application
Constant Volt-Second Clamp Circuit
The circuit shown here will achieve a constant volt-sec-
ond product clamp over varying input voltages. The
ramp generator components, R
T
and C
R
are chosen so
that the ramp at Pin 9 crosses the 1V threshold at the
same time the desired maximum volt-second product
is reached. The delay through the functional nor block
must be such that the ramp capacitor can be com-
pletely discharged during the minimum deadtime.
Output Section
Simplified Schematic Rise/Fall Time (C
L
=1 nF)
Rise/FallTime(C =10nF)
L
Saturation Curves
UC1824
UC2824
UC3824
SLUS326A – MARCH 1997 – REVISED JULY 2007
8
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