ZLED7x30 Datasheet

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 Operation Graphs ...................................................................................................................................... 7

2

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

2.1

ZLED7x30 Overview ............................................................................................................................................ 12

2.2

Control of Output Current via External Sense Resistor Rs .................................................................................. 12

2.3

Multi-Mode Switch Dimming................................................................................................................................. 12

2.4

ZLED7x30 Protection Features............................................................................................................................ 13

2.4.1

Thermal Shut-down Protection ..................................................................................................................... 13

2.4.2

LED Open-Load Protection........................................................................................................................... 13

3

Application Circuit Design............................................................................................................................................ 14

3.1

Applications.......................................................................................................................................................... 14

3.2

Thermal Considerations for Application Design ................................................................................................... 15

3.2.1

Temperature Effects of Load, Layout, and Component Selection................................................................. 15

3.2.2

Temperature Effects of Low Supply Voltage VIN ........................................................................................... 15

3.3

External Component Selection............................................................................................................................. 15

3.3.1

Sense Resistor Rs ........................................................................................................................................ 15

3.3.2

Inductor L1.................................................................................................................................................... 16

3.3.3

Bypass Capacitor C1 .................................................................................................................................... 17

3.3.4

De-bouncing Capacitor C2............................................................................................................................ 19

3.3.5

Capacitor C3 for Reducing Output Ripple..................................................................................................... 19

3.3.6

Diode D1....................................................................................................................................................... 19

3.4

Application Circuit Layout Requirements ............................................................................................................. 19

4

ESD Protection............................................................................................................................................................ 20

5

Pin Configuration and Package ................................................................................................................................... 20

6

Ordering Information ................................................................................................................................................... 21

7

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