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FAN5607 Datasheet(PDF) 11 Page - Fairchild Semiconductor

Part # FAN5607
Description  LED Driver with Adaptive Charge Pump DC/DC Converter
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5607 Datasheet(HTML) 11 Page - Fairchild Semiconductor

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PRODUCT SPECIFICATION
FAN5607
REV. 1.0.0 6/22/04
11
Selecting Capacitors
It is important to select the appropriate capacitor types and
the values for use with the FAN5607. These capacitors deter-
mine parameters such as power efficiency, maximum sus-
tainable load current by the charge pump, input and output
ripple and start-up process.
In order to reduce ripple, both CIN and COUT should be low
ESR capacitors. Increasing the COUT capacitor reduces the
output ripple voltage. However this will increase the power-
on time. The CIN value controls input ripple. If necessary,
this ripple can be further reduced by powering the FAN5607
through the RC input filter, as shown in Figure 7. Two low
ESR bucket capacitors of value between 0.1µF to 1µF,
should be used for best efficiency in boost mode. The bucket
capacitor, CAP1 = CAP2 = 1µF is recommended, if the
FAN5607 is required to start at battery voltage lower than
3V.
PC Board Layout
For best performance, a solid ground plane is recommended
on the back side of the PCB. The ground tails of CIN and
COUT should be connected together close to the GND pin of
IC.
0.22
10
µF
4.7
µF
Input
Power
Supply
VIN
GND
FAN5607
Figure 7. Battery Ripple Reduction


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