RT8577 datasheet(11/12 Pages) RICHTEK

Part #	RT8577

Description	High Voltage 4-CH LED Driver

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Manufacturer	RICHTEK [Richtek Technology Corporation]

Direct Link	http://www.richtek.com

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11

DS8577-00 November 2011

www.richtek.com

RT8577

PGND

D1

L1

AGND

VIN C

IN

RC

CC

CSS

RSENSE

COUT

21

GND

LED2

OVP/UVP

GND

LED1

CREG

SEN

PGND

DRV

RISET

EN

15

14

13

12

1

2

3

4

11

5

78

9

10

19

18

17

16

6

20

RRT

CF

MSW

R1

VOUT

VIN

RF1

RF2

RDRV

CVCC

PGND

AGND

Locate the CVCC as close to

VCC as possible.

Place the power components as

Close as possible. The traces

should be wide and short especially

for the high current loop.

The exposed pad of the chip

should be connected to ground

plane for thermal consideration.

Separate power ground (PGND) and

analog ground (AGND). Connect AGND

and PGND islands at a single end. Make

sure there are no other connections

between these separate ground planes.

The PGND should be wide and short

enough to connect ground plane.

The compensation circuit and RISET resistor

should be kept away from the power loops and

should be shielded with a ground trace to prevent

any noise coupling.

RISET

Figure 4. PCB Layout Guide

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RT8577 Datasheet(PDF) 11 Page - Richtek Technology Corporation

RT8577 Datasheet(HTML) 11 Page - Richtek Technology Corporation

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