RT5002 datasheet(25/40 Pages) RICHTEK

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RT5002

DS5002-00

November 2011

www.richtek.com

Address

b[7]

(MSB)

b[6]

b[5]

b[4]

b[3]

b[2]

b[1]

b[0]

(LSB)

Meaning

MOD7

SEQ56

EN56

EN7_DIM7 [4:0]

Default

0x0

Read/Write

R/W

CH7 in step-up mode

MOD7

CH7 in current source mode

CH5/6 power on sequence is CH5

CH6, power off sequence is CH6

CH5

SEQ56

CH5/6 power on sequence is CH6

CH5, power off sequence is CH5

CH6

Enable (turn on) CH5 and CH6 by preset sequence

EN56

Disable (turn off) CH5 and CH6 by preset

Enable CH7 and define FB7 regulation voltage

00000

Ch7 turn off

EN7_DIM7

[4:0]

00001 to

11111

Ch7 turn on and dimming ratio : VFB7 = EN7_DIM7 [4:0] / 31 x 0.25V

CH7 : WLED Driver

CH7 is a WLED driver that can operate in either current

source mode or synchronous step-up mode, as determined

by the I

2C interface. When CH7 works in current source

mode, it sources an LED current out of LX7 pin and

regulates the current by FB7 voltage. The LED current is

defined by the FB7 voltage as well as the external resistor

SEQ56 = 1

SEQ56 = 0

between FB7 and GND. The FB7 regulation voltage can

be set in 31 steps from 8mV to 250mV, typically, via I

interface. If CH7 works in synchronous step-up mode, it

integrates synchronous step-up mode with an internal

MOSFET and internal compensation to output a voltage

up to 15V. The LED current is also set via an external

resistor and FB7 regulation voltage.

CH5 VOUT

10ms

18ms

CH6 VOUT

Constant Current Pre-Charge.

Wait until VOUT6 > -0.12V

5ms

EN56

CH5 VOUT

10ms

16ms

CH6 VOUT

Constant

Current Pre-

Charge.

Wait until VOUT5 < 0.5V

5ms

EN56

2ms

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