AN8038S Panasonic Semiconductor, AN8038S Datasheet - Page 20

• Manufacturer Part Number: AN8038S
• Description: AC-DC switching power supply control IC with RCC local resonance circuit for improved conformance with energy conservation laws
• Manufacturer: Panasonic Semiconductor

AN8038, AN8038S
20
[2] Operation descriptions (continued)
5. Output block (continued)
Application Notes (continued)
Overcurrent protection circuit (input voltage correction function)
overcurrent protection operating point is held fixed with respect to variations in the input voltage. This circuit
uses the proportional relationship between the input voltage and the inverted voltage of the bias winding, and
superposes inverted voltage of the bias winding on the overcurrent protection operating voltage. (See figures
13 and 14.)
As an extended application, this section presents a circuit design that applies a correction so that the
E
E
IN
IN
V
CLM
V
V
I
V
CLM
DS
DS
B
0 V
0 V
0 A
0 V
V
Out
TR
CC
Determines the
amount of correction
Figure 14
Figure 13
Input voltage: larger
Amount of correction: larger
Rrs
Drs
Zrs
V
Input voltage
correction
B
For an FB voltage: cut off
For an FF voltage:
FB voltage
FF voltage
Input voltage
corresponding
Determines the
input voltage at
which correction
starts.
to the input
Correction
Voltage Regulators
voltage
correction operation
I
E
DS
IN