參數(shù)資料
型號(hào)： CAT4237TS
英文描述： High Voltage CMOS Boost White LED Driver
中文描述： 高電壓的CMOS升壓白光LED驅(qū)動(dòng)器
文件頁數(shù)： 10/13頁
文件大小： 533K
代理商： CAT4237TS
CAT4237
2005 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
10 of 13
Doc. No. 5013, Rev. A
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
recommended PWM frequency range is from
100Hz to 2kHz.
SHDN*
pin.
The
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 CAT4237 FB pin. The PWM signal has a
voltage swing of 0V to 2.5V. The LED current
can be dimmed within a range from 0 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.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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