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AIC1647 Datenblatt(PDF) 9 Page - Analog Intergrations Corporation

Teilenummer AIC1647
Bauteilbeschribung  WHITE LED STEP-UP CONVERTER IN SOT23
PDF  11 Pages
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Hersteller  AIC [Analog Intergrations Corporation]
Direct Link  http://www.analog.com.tw
Logo AIC - Analog Intergrations Corporation

AIC1647 Datenblatt(HTML) 9 Page - Analog Intergrations Corporation

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AIC1647
than the FB pin bias current. With a VDC ranging
from 0V to 5V, the selection of resistors in Figure
21 results in dimming control of LED current from
20mA to 0mA, respectively.
3. Using a Filtered PWM Signal
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. The circuit is shown in Figure 22.
L1
10
µH
D1
SW
VIN
SHDN
FB
GND
AIC1647
VIN
RFB
4.7
Ω
C1
1
µF
C2
1
µF
20mA
D2
R1
1K
RB512S-30
PWM
BZV55-B12
11.8V~12.2V
Fig. 19 Dimming Control Using a PWM Signal with Open-Circuit Protection
L1
10
µH
D1
SW
VIN
SHDN
FB
GND
AIC1647
VIN
RFB
4.7Ω
C1
1
µF
C2
1
µF
20mA
D2
R1
1K
RB512S-30
PWM
R2
BZV55-B12
11.8V~12.2V
51K
Fig. 20 Dimming Control Using a PWM Signal
9



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