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W-6238TD-GT3 データシート(PDF) 10 Page - Copal Electronics

部品番号 W-6238TD-GT3
部品情報  High Efficiency 10 LED Boost Converter
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メーカー  COPAL [Copal Electronics]
ホームページ  http://www.nidec-copal-electronics.com/e
Logo COPAL - Copal Electronics

W-6238TD-GT3 データシート(HTML) 10 Page - Copal Electronics

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W-6238
Doc. No. MD-5019 Rev. D
10
© NIDEC COPAL ELECTRONICS CORP.
Characteristics subject to change without notice
DIMMING CONTROL
There are several methods available to control the
LED brightness.
PWM signal on the SHDN
¯¯¯¯¯ Pin
LED brightness dimming can be done by applying a
PWM signal to the SHDN
¯¯¯¯¯ input. The LED current is
repetitively turned on and off, so that the average
current is proportional to the duty cycle. A 100% duty
cycle, with SHDN
¯¯¯¯¯ always high, corresponds to the
LEDs at nominal current. Figure 1 shows a 1kHz
signal with a 50% duty cycle applied to the SHDN
¯¯¯¯¯ pin.
The recommended PWM frequency range is from
100Hz to 2kHz.
Figure 1. Switching Waveform
with 1kHz PWM on SHDN
¯¯¯¯¯
Filtered PWM Signal
A filtered PWM signal used as a variable DC voltage
can control the LED current. Figure 2 shows the
PWM control circuitry connected to the W-6238 FB
pin. The PWM signal has a voltage swing of 0V to
2.5V. The LED current can be dimmed within a range
from 0mA to 20mA. The PWM signal frequency can
vary from very low frequency up to 100kHz.
Figure 2. Circuit for Filtered PWM Signal
A PWM signal at 0V DC, or a 0% duty cycle, results
in a max LED current of about 22mA. A PWM signal
with a 93% duty cycle or more, results in an LED
current of 0mA.
FILTERED PWM DIMMING [0V to 2.5V]
25
20
15
10
5
0
010
20
30
40
50
60
70
80
90
100
PWM DUTY CYCLE [%]
VFB = 300mV
15
1k
3.1k
3.73k
0V
2.5V
0.22µF
C1
RA
RB
R2
i
R1
VIN
W-6238
FB
SHDN
SW
GND
VIN
PWM
Signal
LED
Current


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