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

• Light control function (Adj2)

Fig.4 shows the connections of Adj2 terminal.

When the light control voltage is 2.4V or more,

divided voltage by the resistors is applied. Light

control is decided by the OSC. frequency of CT2

and the applied voltage to Adj2 terminal.

Fig.5 shows how the applied voltage to Adj2

terminal relates itself to light control.

The voltage range of Adj2 terminal available for

light control is 0.1V to 2.4V.

When the voltage is 2.4V or more, light control

duty becomes minimum(10%), and when it is

0.1V or less, light control duty becomes 100%.

Minimum duty is available by connecting Adj2

terminal to Vref terminal.

Output waveform on above mentioned stage is

shown in Fig.6(a) to Fig.6(c). Fig6(a) shows

100% light controlled state, Fig.6(b) middle state

(50% light controlled), Fig6(c) minimum duty

state.

Light control

voltage

Adj2

Light control

voltage

R1

R2 Adj2

(a). In the case of direct

applying to Adj2 terminal

(b). In the case of applying

to Adj2 terminal by the

division of resistors

Fig.4 Connections of Adj2 terminal

100

80

60

Formula for light control level by light control voltage

2.4 - VAdj2

ONDuty = (100 - ONDutyMin) *

+ONDutyMin (%)

2.4

VAdj2 : Adj2 terminal voltage (V)

ONDutyMin = 10 (%)

40

20

10

0.1

1.0 1.4 2.0 2.4

Adj2 terminal voltage (V)

Fig.5 Adj2 terminal voltage-

light control duty characteristics

G1 output

G2 output

CT2 wave form

Fig.6(a) 100% light control

G1 output

G2 output

CT2 wave form

G1 output

G2 output

CT2 wave form

Fig.6(a) 50% light control

Fig.6(a) 10% light control

(5/7)

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