an8022l Panasonic Corporation of North America, an8022l Datasheet - Page 15

• Manufacturer Part Number: an8022l
• Description: Ac-dc Switching Power Supply Control Ic
• Manufacturer: Panasonic Corporation of North America

Voltage Regulators
[3] Design reference data (continued)
4. Start circuit
Application Notes (continued)
1) When the overload shutting-off condition is kept, the shut-off bias current (OVP operating bias current) of the
2) When automatic reset is desired after the overload shut-off, the standby current of the AN8022L and AN8022SB
time makes the power supply to rise slowly.
[Setting the start resistor R1]
[Setting the C1]
up to the time when the supply current is supplied from the auxiliary bias coil. Therefore, set the C1 as shown in
the following equation:
The start time from the power-on to the actual start can be set by using the values of R1 and C1. Too long start
AN8022L and AN8022SB is 550 A (typical) at V
equation :
is 70 A (typical) at V
When the AN8022L or AN8022SB is started, the operating supply current of 7.5 mA is required at V
The current should be supplied with the discharge current of the C1 during the period from the soft start time
(V
V
R
CC(START)
1
IN
550 A
V
10 V
IN
550 A
7.5 mA
10 V
V
CC
R
CC(STOP)
1
12 V. Therefore, set the R1 as shown in the following equation :
V
IN
) · C
70 A
12 V
1
Soft start time
CC
10 V. Therefore, set the R1 as shown in the following
AN8022L, AN8022SB
CC
18 V.
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