AN8031 データシートの表示（PDF） - Panasonic Corporation

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AN8031

Active filter control IC

Panasonic Corporation 

AN8031

s Terminal Equivalent Circuits

Pin No.

Equivalent circuit

1

1

U.V.L.O.

Internal bias

(Approx. 7.1 V)

Voltage Regulators

Description

I/O

SVCC:

I

The supply voltage terminal for control system.

It monitors the supply voltage and has operating

threshold value for start/stop.

2

Approx. 7.1 V

CS:

I

The input terminal of comparator which detects

To high-speed

converter

the current value flowing in power MOSFET.

The output level of multiplier and the current

value of power MOSFET input from the CS

2

terminal are compared. If the later becomes larger

than the former, the VOUT is set to low level and

the power MOSFET output is cut.

3

Approx. 7.1 V

MPI:

I

The input terminal of multiplier

The voltage after a full-wave rectified AC input

voltage are monitored.

3

4

Approx. 7.1 V Approx. 7.1 V EO:

O

The output terminal of error amplifier / the input

terminal of multiplier.

Error amplifier

output

Multiplier

input

The error amplifier monitors the output voltage

of active filter and amplifies its error portion and

outputs to the multiplier. Therefore, this terminal

serves as another input terminal of the multiplier.

4

5

EI:

I

Approx. Approx. Approx. Approx.

7.1 V 7.1 V 7.1 V 7.1 V

The inverted input terminal of error amplifier / the

overvoltage protection input terminal.

To the noninverted input terminal, the internal

reference voltage of IC (2.5 V typ.) is input.

Since this terminal monitors the output voltage of

Overvoltage

protection input

5

Error amplifier the active filter, it also functions as the input ter-

output

minal for the overvoltage protector which detects

the overvoltage of output voltage and cuts off the

power MOSFET.

4

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