Datasheet > WhiteLED> RT8567A

RT8567A

更新时间： 2024-01-19 06:13:08

品牌	Logo	应用领域
立锜 - RICHTEK		驱动器白色LED灯
页数	文件大小	规格书
13页	288K
描述
6-CH 43V Constant Current LED Driver with PWM Dimming Control

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技术参数
数据手册

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RT8567A 技术参数

Status：	Active	Vin (min) (V)：	2.7
Vin (max) (V)：	24	SW Freq (typ) (kHz)：	1000
Number of LEDs (max) (pcs)：	72	Iout (max)/channel (mA)：	40
Iq (typ) (mA)：	3	Dimming Control：	PWM
Topology：	Boost	Features：	Enable Input;OVP
Package Type：	WQFN3x3-20	Datasheet：	#N/A

RT8567A 数据手册

RT8567A

Function Block Diagram

VIN

OVP

VDC

1.2V

Enable

Control

OSC

OCP &

OTP

PWM

Controller

PGND

VDS

Mini LED

Selection

COMP

PWM

LED Open

Detection

CH1

CH2

CH6

……

ISET

AGND

Operation

Enable Control

temperature is higher than 150C(typically), the LX

N-MOSFET is also turned OFF until the temperature is

lower than 120C(typically).

When VINis higher than the UVLO rising threshold voltage

and ENpin input voltage is higher than its rising threshold,

the converter will be turned on.

Minimum LED Selection

OSC

This block detects all CHx voltages and selects a

minimum voltage to EA(ErrorAmplifier). This function can

guarantee the lowest CH voltage is around 500mV and

Vout can be boosted to the highest forward voltage of LED

strings.

The oscillator generates a clock pulse to control the LX

switching frequency according to the external resistor

connected between RT pin andGND.

PWM Controller

LED Open Detection

This controller includes some logic circuit to control the

internal power MOSFET. This block controls the minimum

ON time and max duty of LX.

When CHx is not connected to any LEDstrings, the voltage

of CHx is pulled low by internal current sink. If voltage of

CHx is lower than 50mV and OVP is over 1.2V, this channel

is detected as open channel and the Minimum LED

Selection function will discard it to regulate other used

channels in proper voltage.

OCP&OTP

When LXN-MOSFET peak current reaches 2A(typically),

the LXN-MOSFET is turned OFF immediately and resumes

again at the next clock pulse. When the junction

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS8567A-00 April 2012

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