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RT8561A

Description
High Voltage 8-CH LED Driver, Active, 6V, 24V, 24V, 40V, Digital;Resistor, 3mA
CategoryPower/power management    BoostConv   
File Size338KB,16 Pages
ManufacturerRichtek Technology Corporation
Websitehttps://www.richtek.com/
Download Datasheet Parametric View All

RT8561A Overview

High Voltage 8-CH LED Driver, Active, 6V, 24V, 24V, 40V, Digital;Resistor, 3mA

RT8561A Parametric

Parameter NameAttribute value
StatusActive
Vin (min)(V)6
Vin (max)(V)24
Vout (min)(V)24
Vout (max)(V)40
Output Adj. MethodDigital;Resis
Iq (typ)(mA)3
SW Current Limit (typ)(A)
Freq (typ)(kHz)1000
Freq (min)(kHz)800
Freq (max)(kHz)1200
Ron (typ)(Ohm)0.3
FeaturesAdjustable Soft-Start;Enable Input;OCP;OVP
Package TypeWQFN4x4-24
®
RT8561A
High Voltage 8-CH LED Driver
General Description
The RT8561A is a 40V 8-CH LED driver capable of delivering
30mA to each channel with 10 LEDs (3.6V per diode),
total of 80 LEDs with one driver. The RT8561A is a current
mode boost converter operated at 1MHz, wide V
IN
range
covers from 6V to 24V and the on-chip current switch is
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 RT8561A automati-
cally detects and disconnects any unconnected and/or
broken strings during operation from PWM loop to prevent
V
OUT
from over voltage.
The 1.5% matched LED currents on all channels are simply
programmed with a resistor or a current sink. Both analog
dimming and digitally controlled PWM dimming are
supported by the RT8561A. Analog dimming is linearly
controlled by an external voltage. With an on-chip output
clamping amplifier and a 300kΩ resistor, PWM dimming
signal is easily low-pass filtered to an analog dimming
signal with one external capacitor for noise-free PWM
dimming. A very high contrast ratio true digital PWM
dimming can be achieved by driving ACTL pin with a PWM
signal.
Other protecting features include programmable output
over voltage protection, LED current limit, PWM switch
current limit and thermal shutdown.
The RT8561A is packaged with a tiny footprint package of
WQFN-24L 4x4 packages.
Features
High Voltage : V
IN
up to 24V, V
OUT
up to 40V, Driving
up to 80 x 3.6V LEDs (10 each channel)
Channel Current Programmable 10mA to 30mA and
Matched to 1.5%
Current Mode PWM 1MHz Boost Converter
Easy Analog and Digital Dimming Control
Programmable Soft Start
Automatic Detecting Unconnected and/or Broken
Channel
Programmable Over Voltage Protection
Disconnects LED in Shutdown
Providing High Accuracy Digital Dimming by PWM
at ACTL Pin
V
IN
Under Voltage Lockout
Over Temperature Protection
Current Limiting Protection
Small 24-Lead WQFN Package
RoHS Compliant and Halogen Free
Applications
UMPC and Notebook Computer Backlight
GPS, Portable DVD Backlight
Desk Lights and Room Lighting
Pin Configurations
(TOP VIEW)
GND
GND
GND
GND
SW
20
24
23
22
21
LED1
LED2
LED3
LED4
LED5
OVP
SW
19
18
17
1
2
3
4
5
6
7
8
9
10
11
25
12
VCC
CREG
LED8
LED7
LED6
EN
GND
16
15
14
13
Ordering Information
RT8561A
Package Type
QW : WQFN-24L 4x4 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
RISET
ACTL
WQFN-24L 4x4
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
Marking Information
CZ= : Product Code
CZ=YM
DNN
YMDNN : Date Code
is a registered trademark of Richtek Technology Corporation.
DS8561A-02 April 2012
DCTL
VC
NC
SS
www.richtek.com
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