Datasheet > FA8A01N

FA8A01N

更新时间： 2024-04-09 19:02:20

品牌	Logo	应用领域
富士电机 - FUJI		/
页数	文件大小	规格书
30页	761K
描述
8pin SOP

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FA8A01N 数据手册

FA8A00N / 01N Datasheet

(iv)Short detection for secondary side

・Connection method

Same as (1)

・Operation

If output of PSU is shorted, CS pin voltage exceeds the

OLP detection level. In addition, Vcc voltage drops

because auxiliary winding voltage is almost zero. IC

stops switching operation immediately when CS pin

voltage exceeds overload detection voltage and Vcc

drops below Vthshort (10V typ.).As in the case of

overload, FA8A00N restart switching operation after

1400ms and repeats it until short circuit condition is

removed.FA8A01N become the latch condition. The

delay time of short circuit protection operates is

dependent on the capacitor of VCC pin, and the VCC

pin voltage value. If VCC pin voltage does not drop

until Vthscp=10V within 70 msec, overcurrent

protection operate.

Start-up circuit

control signal

VCC

start

Fig.32 VH pin circuit (1)

(7) Pin No.7 (N.C.)

Since this pin is placed adjacent to the high-voltage pin,

it is not connected to inside the IC.

(8) Pin No.8 (VH pin)

[Function]

(i)Supplies start-up current

(ii)Discharging the X capacitor when AC input is cut off

(iii)Stop the switching when AC input voltage is

decreased.

Start-up circuit

control signal

VCC

start

Fig.33 VH pin circuit (2)

[How to use]

(i) Supplies start-up current

・Connection method

VH pin is connected to the AC line with full wave

rectification via the start-up resistance of 5.6k-15kΩ

and diodes. (Fig.32)

(Caution 1)

The connection shown in Fig.33 is not recommended.

VH pin connected to AC line with half wave rectification

and X-capacitor discharge function operates only for

the half cycle of AC line voltage.

(Caution 2)

Start-up circuit

control signal

VCC

The VH pin cannot be connected from DC input after

the AC input voltage is rectified / smoothed.

X-Capacitor discharge function does not operate

properly and IC may be overheated and damaged.

(Fig.34)

start

(Caution 3)

Fig.34 VH pin circuit (3)

If a capacitor is connected between VH pin and GND

as a measure against surging of the AC input line, it

should be of 100pF or lower. If a capacitor of 100pF or

higher is connected, the discharging function of the X

capacitor will malfunction.

・Operation

This IC incorporates a start-up circuit of 500V. If AC

power is input, the capacitor C2 connected to the VCC

pin will be charged by the current supplied from the

start-up circuit and the voltage will increase. When the

VCC pin voltage reaches the on threshold voltage, the

IC will start operating. After the IC operates, the start-

up circuit will be put in the cutoff state, and the VH pin

current will be reduced to several tens of uA.

July,2016 DS-102E Rev3.0

26/30

1...23 24 252627 28 29 30

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