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W-6237TD-G3 数据表(PDF) 10 Page - Copal Electronics

部件名 W-6237TD-G3
功能描述  High Voltage CMOS Boost
Download  13 Pages
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制造商  COPAL [Copal Electronics]
网页  http://www.nidec-copal-electronics.com/e
标志 COPAL - Copal Electronics

W-6237TD-G3 数据表(HTML) 10 Page - Copal Electronics

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W-6237
10
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 25
shows a 1 kHz signal with a 50% duty cycle applied to the
SHDN pin. The recommended PWM frequency range is
from 100 Hz to 2 kHz.
Figure 25. Switching Waveform with 1 kHz PWM on
SHDN
Filtered PWM Signal
A filtered PWM signal used as a variable DC voltage can
control the LED current. Figure 26 shows the PWM control
circuitry connected to the W-6237 FB pin. The PWM
signal has a voltage swing of 0 V to 2.5 V. The LED current
can be dimmed within a range from 0 mA to 20 mA. The
PWM signal frequency can vary from very low frequency up
to 100 kHz.
Figure 26. Circuit for Filtered PWM Signal
1k
3.1 k
0V
2.5 V
0.22 F
C1
i
VIN
W-6237
FB
SW
GND
VIN
PWN
Signal
LED
Current
RB
3.73 k
SHDN
R1
15
R2
RA
VFB = 300 mV
A PWM signal at 0 V DC, or a 0% duty cycle, results in
a max LED current of about 22 mA. A PWM signal with a
93% duty cycle or more, results in an LED current of 0 mA.
Figure 27. Filtered PWM Dimming (0 V to 2.5 V)
25
20
15
10
5
0
0
10
20
30
40
50
60
70
80
90 100
PWM DUTY CYCLE (%)


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