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FAN5609MPX 数据表(PDF) 5 Page - Fairchild Semiconductor

部件名 FAN5609MPX
功能描述  LED Driver with Adaptive Charge Pump DC/DC Converter
Download  11 Pages
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

FAN5609MPX 数据表(HTML) 5 Page - Fairchild Semiconductor

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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 IAverage value
(PWM). In PWM mode, the modulating frequency has to be
set sufficiently high in order to avoid a flickering effect
(100Hz to 1kHz).
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
0101
B
0011
ILED
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
VOUT
VIN
GND
CAP2
Figure 2
Step-up
3:2 configuration
Switch positions shown in charge phase.
Reverse all switches for pump phase.
COUT
VOUT
= 2 X VIN
+
+
-
-
VIN


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