RT4539AWSC datasheet(15/39 Pages) RICHTEK

15 / 39 page

RT4539A

is a registered trademark of Richtek Technology Corporation

DS4539A-01

December 2022

www.richtek.com

The RT4539A is a general purpose 6-CH LED driver

and is capable of delivering a maximum 35mA LED

current. The IC is a current mode Boost converter

integrated with a 2.5A power switch and can cover a

wide VIN range from 2.7V to 24V. Moreover, the IC

contains I2C interface for controlling the dimming mode,

operating frequency and the LED current. The internal

250mΩ, 39V power switch with current-mode control

provides over-current protection. The switching

frequency of the RT4539A is adjustable from 300kHz to

1.6MHz, which allows flexibility between efficiency and

component size.

Programmable functions include:



PWMO frequency.



LED constant current



Spread Spectrum



LX Edge Rate Control



Mixed Mode Change Duty



Dimming Mode Selection



Switching Current Limitation Selection



Boost switching frequency



LED Mapping Mode



LED Driver Headroom setting



Resolution Bit Selection



Filter Selection for smooth dimming modification



Slope Time Control Function



Fade in/out Time Control



PWM Sample Rate Selection



Advanced Brightness Control



26KHz Mode Division Frequency



Soft Start Time Control



Lowest Switching Frequency for PFM



PFM Function Enable



LED Short Protection



LED OVP Level Selection



Boost Over-Voltage Protection Selection



BL Control Enable



FB1~FB6 Control Enable



LED Current Setting



Exponential

function

for

smooth

dimming

modification

Dimming Control Mode Selection

The RT4539A provides five dimming modes for

controlling the LED brightness. These functions include

PWM mode, PWM-26k Mode, Mixed Mode, Mixed-26k

Mode, DC mode and change duty threshold of mixed

mode. The dimming control mode selection is

programmable by register address 00h.

Table 2. Dimming Control Mode Selection

Address Bit

Name

Default Value

Description

R/W

00h

[2:

Dimming Mode

Selection

Mixed-26k Mode

(B011)

B000: PWM Mode (Direct PWM)

B001: PWM-26k Mode (Non-Direct

PWM)

B010: Mixed Mode

B011: Mixed-26k Mode

B100: DC Mode

R/W

[3]

Mixed Mode Change

Duty

25% (B1)

B0: 12.5%

B1: 25%

R/W

RT4539AWSC bảng dữ liệu(PDF) 15 Page - Richtek Technology Corporation

RT4539AWSC bảng dữ liệu(HTML) 15 Page - Richtek Technology Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

bảng dữ liệu tải về

Link URL