ALED6000 datasheet(44/45 Pages) STMICROELECTRONICS

44 / 45 page

List of figures

Figure 1.

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

Figure 2.

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

Figure 3.

Pin connection (top view) ............................................................. 4

Figure 4.

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

Figure 5.

Switching frequency programmability.................................................... 10

Figure 6.

Feed-forward .................................................................... 11

Figure 7.

Soft-start ....................................................................... 12

Figure 8.

Dimming operation ................................................................ 13

Figure 9.

Dimming operation (rising edge) – VIN=44 V, 12 LED ........................................ 13

Figure 10.

Dimming operation (falling edge) – VIN=44 V, 12 LED ........................................ 14

Figure 11.

Dimming operation – short DIM pulse ................................................... 14

Figure 12.

ISKIP typical current and RILIM value ................................................... 16

Figure 13.

OCP and frequency scaling .......................................................... 17

Figure 14.

Current limit and programming resistor .................................................. 18

Figure 15.

LED small signal model ............................................................. 20

Figure 16.

Switching regulator control loop simplified model............................................ 21

Figure 17.

Type II compensation network ........................................................ 22

Figure 18.

Type II compensation - Bode plot ...................................................... 23

Figure 19.

ALED6000 demonstration board schematic ............................................... 25

Figure 20.

ALED6000 demonstration board layout (top side) ........................................... 26

Figure 21.

ALED6000 demonstration board layout (bottom side) ........................................ 27

Figure 22.

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

Figure 23.

Inverting buck-boost schematic........................................................ 29

Figure 24.

Inverting buck-boost PCB layout (component side) .......................................... 30

Figure 25.

Inverting buck-boost PCB layout (bottom side) ............................................. 30

Figure 26.

Positive buck-boost topology ......................................................... 31

Figure 27.

Positive buck-boost schematic ........................................................ 31

Figure 28.

Positive buck-boost PCB layout (component side)........................................... 32

Figure 29.

Positive buck-boost PCB layout (bottom side).............................................. 32

Figure 30.

Floating-boost topology ............................................................. 33

Figure 31.

Floating-boost reference schematic ..................................................... 34

Figure 32.

Floating-boost PCB layout (component side) .............................................. 35

Figure 33.

Floating-boost PCB layout (bottom side) ................................................. 35

Figure 34.

Type I compensation network ......................................................... 36

Figure 35.

HTSSOP16 package outline.......................................................... 38

Figure 36.

HTSSOP16 recommended footprint .................................................... 39

ALED6000

List of figures

DS13018 - Rev 4

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