Sharp R-320CD Uživatelský manuál stáhnout pdf (Strana 14)

LD-22Z03D- 11

6-2．LED backlight

6-2．LED backlight 6-2．LED backlight

6-2．LED backlight

Ta＝+25℃

Unit

【*1】 There are two Light Bars, and the specified current is input LED chip 100% duty current.

【*2】 The LED current for each string　for the luminance of module 300cd/m

【*3】 The LED current for each string　for the luminance of module 450cd/m

【*4】 This module use two LED bar. Each LED bar consist of 5ch.

【*

5】

LED

= I

LED

× V

LED ×

ch.

- h

【Reference】

【*1,3,7】

(30,000)

(Module)

Parameter

Supply voltage

Current dissipation

Number of LED channels -

LED

21.0

LED

- 85

Symbol Min. Typ. Max.

23.8 【*1】

【*2】90

Remark

Life time L -

【*1,2,5】

- h

【Reference】

【*1,2,6】

(Module)

Power Consumption

11.6

LED

(50,000)

- 17.9

【*3】

【*1,3,5】

21.5

【*4】

【*

5】

LED

= I

LED

× V

LED ×

ch.

【*6】 The life time is determined as the time at which luminance of the LED becomes 50% of the initial

brightness or not normal lighting at I

LED

=55 mA on condition of continuous operating at 25℃.

【*7】 The life time is determined as the time at which luminance of the LED becomes 50% of the initial

brightness or not normal lighting at I

LED

=85 mA on condition of continuous operating at 25℃.

【Note】 Please do not connect the channel of the LED in parallel.

The overcurrent flows to one channel where VL is low when VL of each channel is different, and the

LED longevity might shorten.

Please drive the LED of each channel at a constant current.

Please design to connect the current limitation resistance without fail in the circuit, and to drive in ratings.

Please design so that the excess voltage (overcurrent) should not hang momentarily when the circuit

is turned on, and turned off.

Please design so that the average current value may become it in ratings when it is used by the pulse drive.

In case of using pulse drive for backlight driving, please keep frequency enough high in order to

avoid the flicker or the deterioration of display quality.

Please design so that the backward voltage should not hang when LED is turned off.

Please build the protection circuit into the system to not generate the overcurrent and overvoltage

in abnormal circumstances.

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