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AME5142AEEVADJZ Fiches technique(PDF) 8 Page - Analog Microelectronics

No de pièce AME5142AEEVADJZ
Description  White LED Boost Converter In Tiny Package
Download  18 Pages
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Fabricant  AME [Analog Microelectronics]
Site Internet  http://www.ame.com.tw/
Logo AME - Analog Microelectronics

AME5142AEEVADJZ Fiches technique(HTML) 8 Page - Analog Microelectronics

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AME, Inc.
10
White LED Boost Converter
In Tiny Package
AME5142
Rev. A.01
n Application Hints
Dimming Control
Figure6. Dimming Control Using a DC Voltage
B. Using a DC Voltage
Using a variable DC voltage to adjust the brightness
is a popular method in some applications. The dim-
ming control using a DC voltage circuit is shown in
Figure 6. According to the Superposition Theorem,
as the DC voltage increases, the voltage contributed
to V
FB increases and the voltage drop on R2 decreases,
i.e. the LED current decreases. For example, if the
V
DC range is from 0V to 3V, the selection of resistors
in Figure 6 sets dimming control of LED current from
20mA to 0mA.
C. Using a Filtered PWM Signal
The filtered PWM signal can be considered as an adjust-
able DC voltage. It can be used to replace the variable DC
voltage source in dimming control. The circuit is shown in
Figure 7.
Figure 7. Dimming Control Using a Filtered PWM Signal
PWM Signal
L1
10
µH
AME5142
GND
IN
EN
SW
FB
V
IN 2.7V to 5.5V
OVP
V
OUT
C
OUT
1
µF
R2
7.5
Ω
C
IN
4.7
µF
R3
5.1K
R4
91K
C
DC
0.1
µF
3V
0V
R
DC
10K
L1
10
µH
AME5142
GND
IN
EN
SW
FB
V
IN 2.7V to 5.5V
OVP
V
OUT
C
OUT
1
µF
R2
7.5
Ω
C
IN
4.7
µF
R3
5.1K
R4
91K
VDC Dimming
0V to 3V


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