M62295FP データシートの表示（PDF） - MITSUBISHI ELECTRIC

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M62295FP

PC BACK- LIGHT CONTROL IC LCD BACK-LIGHT CONTROL IC

MITSUBISHI ELECTRIC  

MITSUBISHI(Standard Linear ICs)

M62295GP

PC BACK- LIGHT CONTROL IC

• Protection function (timer-latch) (Cscp1, Cscp2, Iscp)

Application for timer-latch by detecting tube current

and feecback voltage is available by using Iscp,

Cscp1, Cscp2 terminal.

Two kinds of setting for timer-latch time is available

by the setting of Cscp1, Cscp2. Each timer-latch

time is set by the formula below.

Cscp1 :

Terminal for capacitance for timer-latch set (few sec.)

Timer-L (Cscp1) = Cscp1 *

2.5

1.3 * 10 -6

Cscp2 :

Terminal for capacitance for timer-latch set (few msec.)

Timer-L (Cscp2) = Cscp2 *

1.25

1.3 * 10 -6

Detection of tube current

Detection of tube current is made by Iscp terminal.

Detection voltage for Iscp terminal is set 1.25V.

After power is on, when Iscp voltage does not rise

up to 1.25V by timer-L(Cscp1) time, or when Iscp

voltage becomes 1.25V or less after start-up,

abnormality is detected to move on to the protection

operation mode in Fig.1.

If Iscp voltage is less than 1.25V, light control is

not made(100%).

Cscp1

Cscp1

Cscp2

Cscp2

Fig.7 Connections of Cscp1, Cscp2

BL tube current detection

Iscp

Detection of feedback voltage

Detection of feedback voltage is made by FB

terminal.

When FB terminal voltage goes down to FB low

detection voltage (0.25V) or less, or when it rise up

to FB terminal high detection voltage or more,

abnormality is detected to move on to the protection

operation mode in Fig.1.

Fig.8 Connections of Iscp terminal

Operation state

Normal start-up

Protection

operation mode

Triggers for protection operation Timer-latch time

Ampout="H" Ampout="L" Io=0

2sec 10msec

Start-up in

Io=Max Operation stop after 10ms

shortcircuited state Io=0 Operation stop instantaneously

Start-up in open state Operation stop after 2sec.

Start-up in black

mode

OFF Operation stop after 2sec.

Normal start-up if turn-on

ON is made within 2sec.

Shortcircuit while Io=Max Operation stop instantaneously

in operation

Io=0 Operation stop instantaneously

Open while in operation Operation stop instantaneously

Table 1. Protection operation mode at a glance

Note 1. Timer-latch time refers to the time under Cscp=1uF, Cscp2=0.1uF.

2. Amp. output is "H" when tube current I0 equals to 0, "L" when it is at

its minimum. Detection voltage is 2.5V("H" side), 0.25V("L" side).

(6/7)

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