Rainbow-electronics MAX8759 Manual de usuario descargar pdf (Pagina 30)

MAX8759

6) Ensure the feedback connections are short and

direct. To the extent possible, IFB1, IFB2, VFB, and

ISEC connections should be far away from the high-

voltage traces and the transformer.

7) To the extent possible, high-voltage trace clearance

on the transformer’s secondary should be widely

separated. The high-voltage traces should also be

separated from adjacent ground planes to prevent

lossy capacitive coupling.

8) The traces to the capacitive voltage-divider on the

transformer’s secondary need to be widely separated

to prevent arcing. Moving these traces to opposite

sides of the board can be beneficial in some cases.

Low-Cost, SMBus, CCFL Backlight Controller

30 ______________________________________________________________________________________

Chip Information

TRANSISTOR COUNT: 16,138

PROCESS: BiCMOS

15161718192021

7654321

MAX8759

*EXPOSED PADDLE

TQFN 5mm x 5mm

TOP VIEW

SDA

BATT

SCL

TFLT

VALS

ALS

PWMI

GND

LX2

GH2

BST2

PGND2

GL2

GL1

PGND1

BST1

GH1

LX1

ISEC

VFB

IFB2

IFB1

DEL

COMP

FREQ

PWMO

Pin Configuration

1 2 ... 25 26 27 28 29 30 31

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Rainbow-electronics MAX8759 Manual de usuario Pagina 30

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