13

LTC3452

3452f

Although the LTC3452 can safely provide this current

continuously, the external LED(s) may not be rated for this

high a level of continuous current. Higher current levels in

a single LED are generally reserved for pulsed applica-

tions, such as LED camera flash. This is accomplished by

resistors and pulsing the appropriate enable pin or pins as

shown in the back page application.

Varying LED Brightness Linearly

Continuously variable LED brightness control can be

pins. Figure 3 shows four such methods employing a

voltage DAC, a current DAC, a simple potentiometer or a

power bank LED currents. These four techniques can be

power bank LED currents.

APPLICATIO S I FOR ATIO

(3d)

1

µF

100

3452 F03

= 256

(3c)

0.8V

(3b)

IDAC

≤

0.8V

(3a)

CURRENT

DAC

LTC3452

LTC3452

LTC3452

LTC3452

VOLTAGE

DAC

Figure 3. Additional Brightness Control Methods: (3a) Using Voltage DAC,

(3b) Using Current DAC, (3c) Using Potentiometer, (3d) Using PWM Input