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AP3029 Datasheet(PDF) 11 Page - BCD Semiconductor Manufacturing Limited

Part # AP3029
Description  WHITE LED STEP-UP CONVERTER
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Manufacturer  BCDSEMI [BCD Semiconductor Manufacturing Limited]
Direct Link  http://www.bcdsemi.com
Logo BCDSEMI - BCD Semiconductor Manufacturing Limited

AP3029 Datasheet(HTML) 11 Page - BCD Semiconductor Manufacturing Limited

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11
Oct. 2009 Rev. 1. 8
BCD Semiconductor Manufacturing Limited
Data Sheet
WHITE LED STEP-UP CONVERTER
AP3029
Application Information (Continued)
this PWM signal can be up to 2KHz. Please refer to
Figure 20.
Figure 20. Dimming Control
Using a PWM Signal in CTRL Pin
Secondly, adding a constant DC voltage through a
resistor divider to CTRL pin can control the dimming.
The FB voltage is indirectly adjusted when the CTRL
pin voltage is between 50mV to 1.8V, which can be
used as dimming control. Please refer Figure 21.
Figure 21. Dimming Control
Using a DC Voltage in CTRL Pin
Thirdly, using a filtered PWM signal adding to CTRL
pin can achieve dimming control. The filtered PWM
signal can be considered as an adjustable DC voltage.
It will change the FB voltage indirectly and achieve
dimming control. The circuit is shown in Figure 22.
Figure 22. Dimming Control
Using a Filtered PWM Signal Voltage in CTRL Pin
(2). Changing the Effective Feedback Voltage
There are three methods to change the effective
feedback voltage.
First, adding a constant DC voltage through a resistor
divider to FB pin can control the dimming. Changing
the DC voltage or resistor between the FB Pin and the
DC voltage can get appropriate luminous intensity.
Comparing with all kinds of PWM signal control, this
method features a stable output voltage and LEDs
current. Please refer Figure 23.
Figure 23. Dimming Control
Using DC Voltage
Second, using a filtered PWM signal can do it. The
filtered PWM signal can be considered as a varying
and adjustable DC voltage.
Figure 24. Dimming Control
Using a Filtered PWM Voltage
Third, using a logic signal to change the feedback
voltage. For example, the FB pin is connected to the
GND through a mosFET and a resistor. And this
mosFET is controlled a logic signal. The luminous
intensity of LEDs will be changed when the mosFET
turns on or off.
AP3029
CTRL
up to 2kHz
AP3029
CTRL
R1
10k
R2
10k
V
DC
0.1 to 3.6 V
AP3029
CTRL
R1
5k
C1
100nF
PWM
Signal
R1
10
FB
AP3029
R2
5K
R3
90K
V
DC
Effective
Feedback Voltage
R1
10
FB
AP3029
R2
5K
R3
90K
PWM
R4
10K
C
0.1
µF
Effective
Feedback Voltage


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