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SM8122AD датащи(PDF) 10 Page - Nippon Precision Circuits Inc

номер детали SM8122AD
подробное описание детали  White LED Driver IC
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производитель  NPC [Nippon Precision Circuits Inc]
домашняя страница  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM8122AD датащи(HTML) 10 Page - Nippon Precision Circuits Inc

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SM8122A
NIPPON PRECISION CIRCUITS INC.—10
Brightness Adjustment using CE Pin
The LED average current can be adjusted by controlling the duty of a PWM signal input on the CE pin. When
CE goes from LOW to HIGH, the soft start function operates (with 500
µs constant soft start time) and, there-
fore, the LED average current ratio for a given PWM signal duty falls with increasing PWM signal frequency.
Taking this into consideration, the recommended PWM control signal has a frequency range of 100 to 400Hz
with duty cycle range of 10 to 90%.
When adjusting the brightness using the CE pin, a ripple voltage synchronized to the PWM signal is generated
across the output capacitor COUT. The amplitude of the ripple voltage is determined by the number of LEDs
and their forward-bias voltage drop characteristics. If a ceramic capacitor is used for the output capacitor
COUT, an audible noise may be generated due to the ceramic capacitor’s piezoelectric effect. The audible noise
level depends on the ceramic capacitor (capacitance, bias dependency, withstand voltage etc.), LEDs (number,
forward-bias voltage drop etc.), and mounting board (thickness, mounting conditions etc.), and thus should be
verified under actual conditions.
Brightness adjustment circuit using CE pin
VOUT
SM8122
R1
25
SBD
PWM signal
VDD
SW
CE
FB
COUT
1.0
µF
VIN
3.6V
CIN
4.7
µF
LED
VSS
L
4.7
µH
PWM signal duty vs. LED average current
10
20
0.0
5.0
10.0
15.0
20.0
0
30405060708090
100
PWM signal duty [%]
400 [Hz]
100 [Hz]
1000 [Hz]
1400 [Hz]
Alternatively, a tantalum capacitor or film capacitor with low piezoelectric effect can be used as the output
capacitor COUT to minimize the noise level, or the brightness can be adjusted using the FB pin as described
earlier. The audible noise generated when using the CE pin is not an inherent phenomena of the SM8122A
device, but of the brightness adjustment method employed.
Output voltage with LEDs ON
Output voltage with LEDs
OFF
CE input signal and output ripple voltage
20mA
COUT
3.5V
3.5V
3.5V
0.5V
11.0V
0mA
COUT
2.7V
2.7V
2.7V
0V
8.1V


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