AN8022L 查看數據表（PDF） - Panasonic Corporation

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AN8022L

AC-DC switching power supply control IC

Panasonic Corporation 

Voltage Regulators

AN8022L, AN8022SB

s Application Notes (continued)

[3] Design reference data (continued)

4. Start circuit

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

time makes the power supply to rise slowly.

[Setting the start resistor R1]

1) When the overload shutting-off condition is kept, the shut-off bias current (OVP operating bias current) of the

AN8022L and AN8022SB is 550 µA (typical) at VCC = 10 V. Therefore, set the R1 as shown in the following

equation :

R1 <

VIN − 10 V

550 µA

2) When automatic reset is desired after the overload shut-off, the standby current of the AN8022L and AN8022SB

is 70 µA (typical) at VCC = 12 V. Therefore, set the R1 as shown in the following equation :

VIN − 10 V

550 µA

< R1 <

VIN − 12 V

70 µA

[Setting the C1]

When the AN8022L or AN8022SB is started, the operating supply current of 7.5 mA is required at VCC = 18 V.

The current should be supplied with the discharge current of the C1 during the period from the soft start time

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:

(VCC(START) − VCC(STOP)) · C1

7.5 mA

> Soft start time

15

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