ZLED7010 Datasheet

© 2016 Integrated Device Technology, Inc.

14

April 20, 2016

VIN

ISENSE

LX

ZLED7010

n LED

L1

CLED

RS

D1

VS

3.4.

Output Ripple

Shunt a capacitor CLED across the LED(s) as shown in Figure 3.1 to minimize the peak-to-peak ripple current in the

LED if necessary.

Figure 3.1

Output Ripple Reduction

Low-ESR capacitors should be used because the efficiency of CLED largely depends on its ESR and the dynamic

resistance of the LED(s). For an increased number of LEDs, using the same capacitor will be more effective.

Lower ripple can be achieved with higher capacitor values, but it will increase start-up delay by reducing the slope

of the LED voltage. The capacitor will not affect operating frequency or efficiency. For a simulation or bench

optimization, CLED values of a

few μF are an applicable start point for the given configuration.