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| TCA62723FMG Datasheet, PDF (6/13 Pages) Marktech Corporate – Three-Channel Constant-Current LED Driver | |||
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2) Method of inputting PMW signal to terminal REXT
IOUT can be set according to the next expression.
IOUT=
1.17V+
(1.17V â VCONT)ÃREXT
RCONT
REXT
Ã460
VCONT=DÃVPWM D: PWM Duty (%)
RCONT=R1+R2
Please define the cutoff frequency to the next expression. (fC ⤠fPWM)
1
fC =
2ÃïÃRÃC
R1Ã R2
R=
R1 + R2
VIN
2.7V~5.5V
VOUT
VPWM
0V~2.6V
TCA62723FMG
SHDN
CTL0
CTL1
CTL2
GND
VIN
OUT 0
OUT 1
OUT 2
REXT
R2
C
R1
REXT
TCA62723FMG
Current Dimming Control (Reference data)
R1=9.1kâ¦, R2=8.2kâ¦, REXT=8.2kâ¦, C=0.22uF
120
100
80
60
40
20
0
0
fPWM=1kHz
10 20 30 40 50 60 70 80 90
PW M Duty (%)
Note: These application examples are provided for reference only. Thorough evaluation and testing
should be implemented when designing your application's mass production design.
6
2010-06-10
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