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參數(shù)資料
| 型號： | UPD16772A |
| 廠商： | NEC Corp. |
| 英文描述： | 480-OUTPUT TFT-LCD SOURCE DRIVER COMPATIBLE WITH 64-GRAY SCALES |
| 中文描述： | 480輸出的TFT - LCD源驅(qū)動程序完全兼容64灰度 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大小： | 122K |
| 代理商： | UPD16772A |
Data Sheet S14725EJ1V0DS00
11
μ
PD16772A
9. CURRENT CONSUMPTION REDUCTION FUNCTION
The
μ
PD16772A has a low power control function (LPC) which can switch the bias current of the output amplifier
between two levels and a bias control function (Bcont) which can be used to finely control the bias current.
Low Power Control Function (LPC)
The bias current of the output amplifier can be switched between two levels using this pin (Bcont: Open).
LPC = H or Open: Low power mode
LPC = L: Normal power mode
The V
DD2
of static current consumption can be reduced to two thirds of that in normal mode. Input a stable DC
current (V
DD1
/V
SS1
) to this pin.
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 ground potential (V
SS2
) via an external resistor (R
EXT
). When
not using this function, leave this pin open.
Figure 9–1. Bias Current Control Function (Bcont)
PD16772A
μ
B
cont
LPC
R
EXT
H/L
V
SS2
Refer to the table below for the percentage of current regulation when using the bias current control function.
Table 9–1. Current Consumption Regulation Percentage Compared to Normal Mode
R
EXT
Current Consumption Regulation Percentage
LPC = L
LPC = H/Open
∞
(Open)
100%
65%
V
DD1
= 3.3 V
50 k
120%
80%
V
DD2
= 8.7 V
20 k
140%
100%
0
240%
210%
Remark
The above current consumption regulation percentages are not product-characteristic guaranteed
as they re 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.
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