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AN-9744 Datasheet(PDF) 5 Page - Fairchild Semiconductor

Part # AN-9744
Description  Smart LED Lamp Driver IC with PFC Function
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

AN-9744 Datasheet(HTML) 5 Page - Fairchild Semiconductor

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AN-9744
APPLICATION NOTE
© 2012 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1 • 11/9/12
5
System Verification
Figure 14 shows the recommended circuit of a FL7701
system with just a few components.
Figure 14.
Test Circuit
Figure 15 and Figure 16 show the startup waveforms from a
on FL7701 application in DC and AC input conditions at
220 V with ten LEDs.
Figure 15.
Soft-Start Performance in DC
Input Condition
Figure 16.
Soft-Start Performance in AC
Input Condition
Figure 17 and Figure 18 show performance of FL7701
following
the
input
source
changes
from
high-line
frequency, to lower frequency, then to higher frequency.
Figure 17.
Input Source Changing: 45 Hz to 100 Hz
Figure 18.
Input Source Changing: 100 Hz to 45 Hz
The Figure 19 shows the analog dimming performance with
changing VADIM. The output LED current changes according
to the control voltage.
Figure 19.
VADMIN vs. LED Current
ILED[0.2A/div]
VDRAIN[100V/div]
ILED[0.2A/div]
VDRAIN[100V/div]
VCC[5V/div]
VDRAIN[100V/div]
ILED[0.2A/div]
VCC[5V/div]
VDRAIN[100V/div]
ILED[0.2A/div]


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