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AP5725
WHITE LED STEP-UP CONVERTER
Applications Information (Continued)
2. Using a DC Voltage
For some applications, the preferred method of brightness control is a variable DC voltage to adjust the
LED current. The dimming control using a DC voltage is shown in Figure 3 . As the DC voltage increases, the
voltage drop on R2 increases and the voltage drop on R SET decreases. Thus, the LED current decreases. The
selection of R2 and R3 will make the current from the variable DC source much smaller than the LED current and
much larger than the FB pin bias current. For V DC range from 0V to 2V, the selection of resistors in Figure 3 gives
dimming control of LED current from 0mA to 20mA.
AP5725
FB
R3
R2
V DC
100k
5k
R SET
12
Figure 3. Dimming Control Using a DC Voltage
3. Using a Filtered PWM Signal
The filtered PWM signal can be considered as an adjustable DC voltage. It can be used to replace the variable
DC voltage source in dimming control.
4. Using a Logic Signal
For applications that need to adjust the LED current in discrete steps, a logic signal can be used as shown in
Figure 4 . R SET sets the minimum LED current (when the NMOS is off). R SET sets how much the LED current
increases when the NMOS is turned on.
AP5725
FB
R INC
Logic
Signal
R SET
Figure 4. Dimming Control Using a Logic Signal
AP5725
Document number: DS31844 Rev. 3 - 2
11 of 17
www.diodes.com
July 2010
? Diodes Incorporated
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