HFC0100—QUASI RESONANT CONTROLLER
The propagation delay is done by means of the
feedforward resistor, shown as Figure 11.
Through this method, adding one offset voltage
at CS pin (the higher input voltage, the bigger
offset voltage.).
ILimit
I
Limit2
ILimit1
ILimit
△I2
△I1
t
Tdelay
Tdelay
Tdelay Tdelay
Figure 10—Propagation delay of the current
limit
V_bulk
T1
Rfeedforward
R1
HFC0100
Q1
Current Comparator
6
CS
Rsense
C1
Vref
Figure 11—Over Power Compensation
Figure 12 shows the HFC0100 control flow chart.
Figure 13 shows the HFC0100 evolution of the
signals in presence of faults
HFC0100 Rev. 1.01
9/23/2011
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