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LP3310B6F Datasheet(PDF) 6 Page - Lowpower Semiconductor inc

Part # LP3310B6F
Description  High Performance, Constant Current Switching Regulator For 8PCS White LED In Series
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Manufacturer  POWER [Lowpower Semiconductor inc]
Direct Link  http://www.lowpowersemi.com
Logo POWER - Lowpower Semiconductor inc

LP3310B6F Datasheet(HTML) 6 Page - Lowpower Semiconductor inc

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LP3310-00
Jan.-2018
Email: marketing@lowpowersemi.com
www.lowpowersemi.com
Page 6 of 9
Preliminary Datasheet
LP3310
Dimming control
a. Using a PWM Signal to EN Pin
For controlling the LED brightness, the LP3310 can
perform the dimming control by applying a PWM
signal to EN pin. The internal soft-start and wide
range dimming frequency from 100Hz to 100KHz can
insignificantly reduce audio noise when dimming.
The average LED current is proportional to the PWM
signal duty cycle. The magnitude of the PWM signal
should be higher than the maximum enable voltage
of EN pin, in order to let the dimming control perform
correctly.
VIN
EN
NC
LX
6
4
1
5
2
GND
LED+
VIN
4.7uH
C2
2.2uF
R1
12Ω
C1
10uF
FB 3
LED-
PWM
R5
100KΩ
D1
b. Using a DC Voltage
Using a variable DC voltage to adjust the brightness
is a popular method in some applications. The
dimming control using a DC voltage circuit is shown
in below. According to the Superposition Theorem,
as the DC voltage increases, the voltage contributed
to VFB increases and the voltage drop on R2
decreases, i.e. the LED current decreases. For
example, if the VDC range is from 0V to 2.8V, the
selection of resistors in below sets dimming control
of LED current from 20mA to 0mA.
VIN
EN
NC
LX
6
4
1
5
2
GND
LED+
VIN
4.7uH
C2
2.2uF
R1
12Ω
C1
10uF
FB 3
LED-
VDC
EN
R2
5.1KΩ
R3
68KΩ
R5
100KΩ
D1
c. Using a Filtered PWM signal
Another common application is using a filtered PWM
signal as an adjustable DC voltage for LED dimming
control. A filtered PWM signal acts as the DC voltage
to regulate the output current. The suggested
application circuit is shown in the below. In this circuit,
the output ripple depends on the frequency of PWM
signal. For smaller output voltage ripple (<100mV),
the recommended frequency of 2.8V PWM signal
should be above 2KHz. To fix the frequency of PWM
signal and change the duty cycle of PWM signal can
get different output current. According to the
application circuit of below, output current is from
35mA to 12mA by adjusting the PWM duty cycle from
10% to 90%.
VIN
EN
NC
LX
6
4
1
5
2
GND
LED+
VIN
4.7uH
C2
2.2uF
R1
12Ω
C1
10uF
FB 3
LED-
PWM
EN
R2
6.8KΩ
R3
56KΩ
R4
100KΩ
C3
0.1uF
R5
100KΩ
D1


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