AN8021L 查看數據表（PDF） - Panasonic Corporation

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AN8021L

AC-DC switching power supply control IC

Panasonic Corporation 

Voltage Regulators

s Terminal Equivalent Circuits (continued)

Pin No.

Equivalent circuit

6

(2)

PVCC

AN8021L, AN8021SB

Description

I/O

VOUT:

O

The terminal for directly driving a power

MOSFET.

6

(2)

7



VCC , (PVCC), (SVCC):



(3)(4)

Supply voltage terminal.

It monitors the supply voltage and has operat-

ing threshold value for start/stop/OVP reset.

8

(5)

SVCC

6V

Comp.

5 µA

500 Ω

8 (5)

TIM/OVP:

I

The terminal with double functions such as OVP

(overcurrent protection) and timer latch termi-

nal.

[OVP]

When it receives the overvoltage signal of the

power supply output and high is input to the

terminal, internal circuit is turned off. At the

same time, this condition (latch) is hold. To re-

set the OVP latch, it is necessary to reduce VCC

under the release voltage.

[Timer latch]

The output voltage drop due to the overcurrent

condition of power supply output is detected

through the current level for IFB-input. When

IIFB becomes less than current of a certain value,

charge current flows into the capacitor con-

nected to this terminal. When the capacitor is

charged to the threshold voltage of OVP, OVP

starts to operate and the IC stays stop.

9

(6)

VREF

PWM

comp.

IFB :

I

The terminal into which the current feedback

signal is input from the photocoupler of the

power supply output.

I/V

conversion

500 Ω

9 (6)

Note) The number in ( ) shows the pin number for the AN8021SB.

5

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