UPD16647 데이터 시트보기 (PDF) - NEC => Renesas Technology

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UPD16647

402/384-OUTPUT TFT-LCD SOURCE DRIVER (64 GRAY SCALE)

NEC => Renesas Technology 

µ PD16647

7. BIAS CURRENT CONTROL FUNCTION/Bcont

It is possible to fine-control the current consumption by using the bias current control function (Bcont pin). When

using this function, connect this pin to the stabilized VDD2 potential using an external resistor (REXT). When not using

this function, however, short-circuit this pin to VDD2.

Figure7–1. Bias Current Control Function/Bcont

µ PD16647

Bcont

REXT

VDD2

Refer to the table below for the percentage of current regulation when using the bias current control function.

Table7–1. Current Consumption Regulation Percentage Compared to Normal Mode

REXT

SHORT

10 kΩ

20 kΩ

40 kΩ

80 kΩ

Current Consumption Regulation Percentage

100 %

95 %

91 %

85 %

79 %

Remark Be aware that the above current consumption regulation percentages are not product-

characteristic guaranteed as they are based on the results of simulation.

Caution Because the low-power and bias-current control functions control the bias current in the output

amplifier and regulate the over-all current consumption of the driver IC, when this occurs, the

characteristics of the output amplifier will simultaneously change. Therefore, when using these

functions, be sure to sufficiently evaluate the picture quality.

Data Sheet S13607EJ2V0DS00

9

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