ALED6000 datasheet(41/45 Pages) STMICROELECTRONICS

41 / 45 page

Contents

Application schematic .............................................................2

Block diagram .....................................................................3

Pin settings........................................................................4

3.1

Pin connection ................................................................. 4

3.2

Pin description ................................................................ 4

3.3

Maximum ratings ............................................................... 5

3.4

Thermal data .................................................................. 6

3.5

ESD protection ................................................................ 6

Electrical characteristics...........................................................7

Functional description .............................................................9

5.1

Oscillator and synchronization.................................................... 9

5.2

Soft-start..................................................................... 11

5.3

Digital dimming ............................................................... 12

5.4

Error amplifier and light-load management ........................................ 15

5.5

Low VIN operation............................................................. 16

5.6

Overcurrent protection ......................................................... 16

5.7

Overtemperature protection ..................................................... 18

Application information ..........................................................19

6.1

Input capacitor selection........................................................ 19

6.2

Output capacitor and inductor selection ........................................... 19

6.3

Compensation strategy......................................................... 21

6.4

Thermal considerations ........................................................ 23

6.5

Layout considerations.......................................................... 24

Demonstration board .............................................................25

Application notes – alternative topologies.........................................28

8.1

Inverting buck-boost ........................................................... 28

8.2

Positive buck-boost............................................................ 30

8.3

Floating boost ................................................................ 33

8.4

Compensation strategy for alternative topologies ................................... 35

ALED6000

Contents

DS13018 - Rev 4

page 41/45

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