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參數(shù)資料
| 型號： | AN8041S |
| 廠商： | PANASONIC CORP |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | Liquid crystal backlight control IC |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | PLASTIC, SOP-16 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 153K |
| 代理商： | AN8041S |
10
AN8041S
Voltage Regulators
I
Application Notes (continued)
[3] Function descriptions (continued)
3. Error amplifier 1 block and error amplifier 2 block (continued)
The control modes of backlight are described below:
1) Power-on mode
When the power supply is turned on, the DC-DC converter which is connected to the error amplifier 1 block
starts the control.
The output voltage V
OUT
which has been set by the equation in the previous page is reached, and the high
voltage of several kV is generated in the lamp through the DC-AC inverter, and the backlight is lighted up.
During this period, since the lamp current does not flow in the error amplifier 2 block, the error amplifier output
(FB2) becomes high-level, so that its control does not work.
2) Normal control mode
When the backlight is turned on, discharging starts and the current starts to flow in the resistor R7.
When the voltage V
C1
rectified by diode D1, and capacitor C1 reaches the voltage set by resistors R5, R6,
and volume control V
R
; The control function is switched over from the error amplifier 1 block to the error
amplifier 2 block. The output voltage of the DC-DC converter V
OUT
decreases to a voltage lower than the set
voltage, and the lamp voltage is maintained at several hundred volts.
3) Light-regulation operation mode
For the light regulation of the backlight, the "voltage light-regulation" method is used, and the light is
regulated by the input voltage of the inverter. By adding volume V
R
to the inverted input terminal of error
amplifier 2 block to make the detection voltage V
C1
variable, the input voltage of the inverter is regulated so
as to make the lamp current variable for light regulation.
Also, the addition of the volume to the noninverted input side of the error amplifier makes the light
regulation possible.
Usage notes
When this IC is used to control the
DC-DC converter, one of two error
amplifiers is not used. Connection
should be made so that the FB termi-
nal is fixed to high-level as shown in
figure 3.
IN
+
1
6
7
F
D
C
9
F
Error amp. 2
Error amp. 1
R
NF2
C
NF2
R
NF1
C
NF1
IN
+
2
11
IN
2
10
R6
R5
R7
V
R
C
1
V
C1
DC-AC
inverter
Error amplifier 2
block
Backlight lamp
current detection
Backlight
control
D
SBD
L
A
M
P
IN
1
V
REF
V
OUT
R2
R1
R4
R3
16
Error amplifier 1
block
DC-DC
converter
output voltage
detection
Figure 2. Connection method of the error amplifier 1 and 2
9
Error amp. 2
IN
+
2
To reference voltage terminal
FB terminal
→
High-level
V
IN
+
2
>
V
IN
2
11
IN
2
10
FB terminal
open
Figure 3. Connection when the error amplifier 2 block is not used
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