ZLED7015 Datasheet

© 2016 Integrated Device Technology, Inc.

3

April 20, 2016

Contents

1

IC Characteristics .......................................................................................................................................................... 5

1.1

Absolute Maximum Ratings ................................................................................................................................... 5

1.2

Operating Conditions ............................................................................................................................................. 5

1.3

Electrical Parameters............................................................................................................................................. 6

1.4

Typical Operating Characteristics .......................................................................................................................... 7

1.5

Characteristic Waveforms.................................................................................................................................... 10

2

Circuit Description ....................................................................................................................................................... 12

2.1

EN Pin, VP Pin, and Soft-Start Function .............................................................................................................. 12

2.2

Output Current Control......................................................................................................................................... 12

2.2.1

Output Current and RS.................................................................................................................................. 12

2.2.2

Dimming via External DC Voltage Control .................................................................................................... 13

2.2.3

Dimming via PWM Control............................................................................................................................ 14

2.2.4

Microcontroller LED Control.......................................................................................................................... 15

2.2.5

Constant Voltage Application........................................................................................................................ 15

3

Application Circuit Design ........................................................................................................................................... 17

3.1

External Component – RS .................................................................................................................................... 17

3.2

External Component – Inductor L1 ....................................................................................................................... 17

3.3

External Components – Input Decoupling Capacitors C1 and CIN........................................................................ 17

3.4

External Component –Output Capacitors C2 and COUT ........................................................................................ 17

3.5

External Component – Diode D1 .......................................................................................................................... 17

3.6

Additional External Components.......................................................................................................................... 17

4

Operating Conditions................................................................................................................................................... 18

4.1

Under-Voltage Lockout ........................................................................................................................................ 18

4.2

Over-Voltage Threshold and Open-Circuit Protection.......................................................................................... 18

4.3

Over-Temperature Protection .............................................................................................................................. 18

5

ESD/Latch-Up-Protection ............................................................................................................................................ 19

6

Pin Configuration and Package ................................................................................................................................... 19

7

Layout Requirements .................................................................................................................................................. 21

7.1

General Considerations and Ground Traces ....................................................................................................... 21

7.2

Layout Considerations for C1, CIN, C2 and COUT................................................................................................... 21

7.3

Layout Considerations for the EN Pin .................................................................................................................. 21

7.4

Layout Considerations for the LX Pin, L1 External Coil, and D1 Diode................................................................. 21

7.5

Layout Considerations for the External Current Sense Resistor (RS) .................................................................. 21

7.6

Layout Considerations for CVP and CVDD.............................................................................................................. 21

7.7

Layout Considerations for the Thermal Pad......................................................................................................... 21

8

Glossary of Terms ....................................................................................................................................................... 22

9

Ordering Information ................................................................................................................................................... 22

10

Document Revision History ......................................................................................................................................... 22