AIC1647 Ver la hoja de datos (PDF) - Analog Intergrations

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AIC1647

White LED Step-Up Converter in SOT23

Analog Intergrations 

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.

VIN

C1

1µF

PWM

L1

10µH

D1 RB512S-30

VIN

SW

D2

SHDN

BZV55-B12

11.8V~12.2V

GND

FB

R1

AIC1647

1K

C2

1µF

20mA

RFB

4.7Ω

Fig. 19 Dimming Control Using a PWM Signal with Open-Circuit Protection

VIN

C1

1µF

L1

10µH

D1 RB512S-30

VIN

SHDN

GND

SW

D2

BZV55-B12

11.8V~12.2V

FB

AIC1647

R2

R1

PWM

51K

1K

C2

1µF

20mA

RFB

4.7Ω

Fig. 20 Dimming Control Using a PWM Signal

9

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