ZXLD383

ZXLD383

Document number: DS32189 Rev. 3 - 2

7 of 10

www.diodes.com

May 2010

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A Product Line of

Diodes Incorporated

Application Examples

Apart from the Garden Light application circuit shown on the front page of this datasheet, the ZXLD383 may be used in

many other ways. The following circuits and notes show some other possibilities and give typical performance details.

Standard operating mode

The following circuit demonstrates how few components are required to produce a light source using the ZXLD383.

Operating from a single cell, this simple circuit is suited for use in car key fobs, novelty products etc. where small size and

low cost are critical aspects.

capacity.

The attached table shows the average LED currents that can be obtained using a range of inductor values. Also shown are

the peak currents required to achieve the given currents.

Notes:

Low Ripple LED Current Mode

It is possible that the peak LED current required to achieve a given average current is either too high for the LED of choice

or it leads to some loss of efficiency (due to LED resistance losses). In these cases, just two extra low cost components

can be added to provide a low ripple current supply for the LED. The Schottky diode D1 and capacitor C1 rectifies and

smoothes the output of the ZXLD383 giving a low ripple current supply to the load LED. Of course, this circuit could also be

used to power loads other than LEDs.

(uH )

(m A)

(m A )

47

45

8.5

22

100

17.3

10

210

34

6.8

330

50

4.7

415

63

ZXLD 383

3

2

1

4

EN A

GN D

VOU T

5

VC C

L1

1.5V

LED

NC

(uH )

(m A)

47

7.5

22

15.5

10

31

6.8

46

4.7

58

D1

LE D

C1

Z XLD 383

3

2

1

4

EN A

GN D

VO U T

5

VC C

L1

1.5 V

NC