NXP Semiconductors

UM10406

SSL1523 5 W LED driver

© NXP B.V. 2010.

All rights reserved.

For more information, please visit: http://www.nxp.com

For sales office addresses, please send an email to: salesaddresses@nxp.com

Date of release: 3 August 2010

Document identifier: UM10406

Please be aware that important notices concerning this document and the product(s)

described herein, have been included in section ‘Legal information’.

14. Contents

1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1

General description . . . . . . . . . . . . . . . . . . . . . 3

2

Specification. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

3

Demo board views . . . . . . . . . . . . . . . . . . . . . . . 4

4

Demo board connections . . . . . . . . . . . . . . . . . 5

4.1

Connecting the demo board: . . . . . . . . . . . . . . 5

5

Functional description . . . . . . . . . . . . . . . . . . . 5

6

Board system optimization . . . . . . . . . . . . . . . . 7

6.1

Changing the output current and LED current . 7

6.2

Changing the output ripple current . . . . . . . . . . 7

6.3

Changing the load curve. . . . . . . . . . . . . . . . . . 7

7

Board schematic . . . . . . . . . . . . . . . . . . . . . . . . 9

7.1

Bill of materials (BOM) . . . . . . . . . . . . . . . . . . 10

8

Transformer specification . . . . . . . . . . . . . . . . 11

8.1

Winding specification . . . . . . . . . . . . . . . . . . . 12

8.2

Electrical characteristics . . . . . . . . . . . . . . . . . 12

8.3

Core and bobbin . . . . . . . . . . . . . . . . . . . . . . . 12

8.4

Physical dimensions . . . . . . . . . . . . . . . . . . . . 12

9

Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

9.1

Load curves . . . . . . . . . . . . . . . . . . . . . . . . . . 13

9.2

Efficiency curves. . . . . . . . . . . . . . . . . . . . . . . 14

9.3

Input voltage dependency. . . . . . . . . . . . . . . . 15

9.4

EMC requirements . . . . . . . . . . . . . . . . . . . . . 15

9.5

Mains conducted harmonics . . . . . . . . . . . . . . 16

10

References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

11

Legal information. . . . . . . . . . . . . . . . . . . . . . . 18

11.1

Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

11.2

Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

11.3

Trademarks. . . . . . . . . . . . . . . . . . . . . . . . . . . 18

12

Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

13

Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

14

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21