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Richtek - High Voltage 8-CH LED Driver

Numéro de référence RT8561D
Description High Voltage 8-CH LED Driver
Fabricant Richtek 
Logo Richtek 





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RT8561D fiche technique
®
RT8561D
High Voltage 8-CH LED Driver
General Description
The RT8561Dis a 40V 8-CH LEDdriver capable of delivering
30mA to each channel with 10 LEDs (3.6V per diode), for
a total of 80 LEDs per driver. The RT8561D is a current-
mode Boost converter that operates at 1MHz, with a wide
VIN range from 4.5V to 24V and an on chip current switch
rated at 2.5A.
The PWM output voltage loop regulates the LED pins to
0.6V with an auto adjustment circuit allowing voltage
mismatches between LED strings. The RT8561D
automatically detects and disconnects any unconnected
and/or broken strings during operation from the PWM loop
to prevent VOUT from over-voltage.
The 1.5% matched LED currents on all channels can be
simply adjustable with a resistor or a current sink. A very
high contrast true digital PWM dimming can be achieved
by driving the PWM pin with a PWM signal.
Other protections including adjustable programmable
output over-voltage protection, LED current limit, PWM
switch current limit and thermal shutdown are provided.
The RT8561D is available in the WQFN-24L 4x4 package.
Features
z High Voltage : VIN up to 24V, VOUT up to 40V
z Adjustable Channel Current from 10mA to 30mA
z 1.5% Channel Current Matching
z Current-Mode PWM 1MHz Boost Converter
z Easy and High Accuracy Digital Dimming by PWM
Signal
z Adjustable Soft-Start
z Automatic Detection of Unconnected and/or Broken
Channel
z Adjustable Over-Voltage Protection
z Disconnect Adjustable LED in Shutdown
z No Power Sequence Concern
z VIN Under-Voltage Lockout
z Over-Temperature Protection
z Current Limiting
z Small 24-Lead WQFN Package
z RoHS Compliant and Halogen Free
Applications
z UMPC and Notebook Computer Backlight
z GPS, Portable DVD Backlight
z Desk Lights and Room Lighting
Simplified Application Circuit
VIN
C1
R4
L1
RT8561D
VCC
C6
LX
R5
5V EN
LED1
PWM Signal
R6
ACTL
VC
LED2
LED7
LED8
C8 R1
CREG
OVP
C2
C3 SS RISET
C4 GND
VOUT
D1
C5
R7 C7
:
:
:
:
:
...
:
:
:
:
:
:
8 x 10 LED String
:
:: ::
R2
RISET
R3
VOUT
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8561D-00 May 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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