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參數資料
| 型號： | FAN5609MTCX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅動器 |
| 英文描述： | CLIPS |
| 中文描述： | LED DISPLAY DRIVER, PDSO14 |
| 封裝： | TSSOP-14 |
| 文件頁數： | 5/11頁 |
| 文件大小： | 112K |
| 代理商： | FAN5609MTCX |
PRODUCT SPECIFICATION
FAN5609
REV. 1.0.2 5/30/03
5
Shutdown and Short Circuit Current Limit
Set both DAC inputs low to shut down the device. Built-in
short circuit protection limits the supply current to a maxi-
mum of 50mA.
Digital Control
A digital-to-analog converter (DAC) allows selection of the
following modes: OFF, 7mA, 14mA, 20mA, per diode.
By turning the IN B pin ON and OFF, the current can be
modulated between 7 to 20mA to achieve any I
(PWM). In PWM mode, the modulating frequency has to be
set sufficiently high in order to avoid a flickering effect
(100Hz to 1kHz).
Average
value
Digital Control with PWM
Any input can be modulated by a pulse train of variable duty
cycle (
δ
). By turning ON and OFF DAC inputs A or B, the
current can be continuously modulated to any average value
between 1 to 19mA. For a maximum range of LED current,
both A&B can be modulated at the same time.
A
B
0
0
1
0
0
1
1
1
I
LED
OFF
7mA
14mA
20mA
Switch Configuration
Figure 1
Step-up, 2:1 configuration.
Switch positions shown in charge phase.
Reverse all switches for pump phase.
CAP1
GND
V
OUT
V
IN
GND
CAP2
Figure 2
Step-up
3:2 configuration
Switch positions shown in charge phase.
Reverse all switches for pump phase.
C
OUT
V
OUT
=
2 X V
IN
+
-
+
-
V
IN
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