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Fabricante

AN8026

Self-excited RCC pseudo-resonance type AC-DC switching power supply control IC

Panasonic Corporation 

AN8026

s Terminal Equivalent Circuits (continued)

Pin No.

Equivalent circuit

3

VREF

VCC

Comp.

0.7 V

FB

3

4

Comp.

(+) 4

5

5

6

VCC

6

7

7

8

8

Comp.

9

VCC

TON

9

4

Voltage Regulators

Description

I/O

TON:



Terminal for connecting the capacitor for deter-

mining the maximum on-period (high) of the IC

output (VOUT). An equation for approximate

calculation of the maximum on-period (TON) is

as follows:

TON = 6 500 × C

C: External capacitance

CLM:

I

Input terminal for detection of the pulse-by-

pulse overcurrent protection.

Normally, it is recommended that a filter be

attached externally.

GND:



Grounding terminal.

VOUT:

O

Output terminal for directly driving the power

MOSFET.

It uses the totem pole type output.

The maximum rating of the output current:

Peak: ±1 A

DC: ±150 mA

VCC:



Terminal for applying power supply voltage.

It monitors the supply voltage and has the op-

eration threshold of start/stop/OVP reset.

OVP:

I

When overvoltage of the power supply output is

detected and high is inputted to the terminal, it

turns off the internal circuit. At the same time, it

holds that condition (latch).

To reset the OVP latch, the terminal voltage should

be decreased to low, or the VCC should be decreased

to a voltage lower than the release voltage.

FB:

I

Terminal for connecting the photocoupler for

error voltage feedback of the power supply out-

put.

It is possible to cancel about 150 µA of the dark

current of photocoupler.

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