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CPC9909 Datasheet(PDF) 9 Page - IXYS Corporation

Part # CPC9909
Description  High Effciency,Off-line, High Brightness LED Driver
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Manufacturer  IXYS [IXYS Corporation]
Direct Link  http://www.ixys.com
Logo IXYS - IXYS Corporation

CPC9909 Datasheet(HTML) 9 Page - IXYS Corporation

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INTEGRATED CIRCUITS DIVISION
CPC9909
R03
www.ixysic.com
9
2.10 Linear Dimming
A linear dimming function can be implemented by
applying a DC control voltage to the LD pin. By varying
this voltage from 0V to VCS(high), the user can adjust
the current level in the LEDs which in turn will increase
or decrease the light intensity. The control voltage to
the LD pin can be generated from an external voltage
divider network from VDD. This function is useful if the
user requires LED current of a particular level, and
there is no exact RT value available. Note that applying
a voltage higher than the current sense threshold
voltage to the LD pin will not change the output current
due to the fixed internal threshold setting. When the
LD pin is not used, it should be connected to VDD.
Figure 3 Typical Linear Dimming Application Circuit
2.11 PWM Dimming
Pulse width modulation dimming can be implemented
by driving the PWMD pin with a low frequency square
wave signal in the range of a few hundred Hertz. The
PWMD signal controls the LED brightness by gating
the PWM gate driver output pin GATE. The signal can
be generated by a microcontroller or a pulse generator
with a duty cycle proportional to the amount of desired
light output.
Figure 4 Buck Driver for PWM Dimming Application Circuit
2.12 Combination Linear and PWM Dimming
A combination of linear and PWM dimming techniques
can be used to achieve a large dimming ratio.
HB LEDs
350mA
D1
BYV26B
C1
0.1
μF
400V
C1
22
μF
400V
R1
402k
Ω
L1
4.7mH
R4
0.56
Ω
R2
51k
Ω
RA1
5.0k
Ω
C1
2.2
μF
16V
C1
0.1
μF
25V
AC
AC
+
-
BR1
Fuse F2
2A
NTC1
CPC9909
V
IN
CS
GND
GATE
R
T
LD
V
DD
PWMD
IXTA8N50P
LD
Monitor
AC Input
90 - 265V
rms
HB LEDs
900mA Max
ASMT-Mx00
D1 Schottky
40V
0.1
μF
50V
402k
Ω
220
μH
R1
0.27
Ω
10
μF
50V
CPC9909
V
IN
CS
GND
GATE
R
T
LD
V
DD
PWMD
Q1
V
IN
12 - 30V
DC
PWM
CPC1001N*
*Optional Isolation


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