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TCA62723FMG Datasheet(PDF) 6 Page - Marktech Corporate

No. de pieza TCA62723FMG
Descripción Electrónicos  Three-Channel Constant-Current LED Driver
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Fabricante Electrónico  MARKTECH [Marktech Corporate]
Página de inicio  http://www.marktechopto.com
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TCA62723FMG
2010-06-10
6
2) Method of inputting PMW signal to terminal REXT
IOUT can be set according to the next expression.
Please define the cutoff frequency to the next expression. (fC ≤ fPWM)
2.7V~5.5V
SHDN
CTL0
CTL1
CTL2
GND
VIN
OUT 0
OUT 1
OUT 2
REXT
TCA62723FMG
VOUT
VIN
R1
VPWM
0V~2.6V
REXT
R2
C
1.17V+
(1.17V – VCONT)×REXT
RCONT
REXT
IOUT=
×460
VCONT=D×VPWM
D: PWM Duty (%)
RCONT=R1+R2
Current Dimming Control (Reference data)
R1=9.1kΩ, R2=8.2kΩ, REXT=8.2kΩ, C=0.22uF
0
20
40
60
80
100
120
0
1020
30
4050
60
7080
90
PW M Duty (%)
fPWM=1kHz
fC =
1
2 ×
 × R × C
R =
R1× R2
R1 + R2
Note: These application examples are provided for reference only. Thorough evaluation and testing
should be implemented when designing your application's mass production design.


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