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  Richtek Technology Electronic Components Datasheet  

RT8561C Datasheet

High Voltage 8-CH LED Driver

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RT8561C
High Voltage 8-CH LED Driver
General Description
The RT8561C is a 40V 8-CH LED driver capable of
delivering 30mA to each channel with 10 LEDs (3.6V per
diode), for a total of 80 LEDs with one driver. The RT8561C
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 RT8561C automati
cally 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 programmed with a resistor or a current sink. A
very high contrast ratio true digital PWM dimming can be
achieved by driving the PWM pin with a PWM signal.
Other protection features include programmable output
over voltage protection, LED current limit, PWM switch
current limit and thermal shutdown.
The RT8561C is available in a WQFN-24L 4x4 package.
Ordering Information
RT8561C
Package Type
QW : WQFN-24L 4x4 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
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.
Marking Information
E4=YM
DNN
E4= : Product Code
YMDNN : Date Code
Features
z High Voltage : VIN up to 24V, VOUT up to 40V
z Programmable Channel Current from 10mA to 30mA
and Matched to 1.5%
z Current Mode PWM 1MHz Boost Converter
z Easy and High Accuracy Digital Dimming by PWM
Signal
z Programmable Soft-Start
z Automatic Detection of Unconnected and/or Broken
Channel
z Programmable Over Voltage Protection
z Disconnects LED in Shutdown
z No Power Sequence Concern
z VIN Under Voltage Lockout
z Over Temperature Protection
z Current Limiting Protection
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
Pin Configurations
(TOP VIEW)
24 23 22 21 20 19
LED1 1
18 VCC
LED2 2
17 CREG
LED3 3
LED4 4
GND
16 LED8
15 LED7
LED5 5
OVP 6
14 LED6
25 13 EN
7 8 9 10 11 12
WQFN-24L 4x4
DS8561C-00 April 2011
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8561C Datasheet

High Voltage 8-CH LED Driver

No Preview Available !

RT8561C
Typical Application Circuit
VIN
4.5V to 24V
R4
10
C1
10µF
L1
10µH
RT8561C
C6
1µF
5V
18 VCC
R5
1k 13 EN
R6 1k
PWM Signal
11 ACTL
7 VC
C8
R1
1.8k
C2
3.9nF
C3
4.7µF
17 CREG
9 SS
C4
0.1µF
LX 19, 20
LED1 1
LED2 2
LED7 15
LED8 16
OVP 6
RISET 10
D1
C5
10µF
R7 C7
:
::
:
RISET
4.75k
R2
R3
VOUT
40V MAX
...:
::
:
:
:
:
:
:
::
8 x 10 LED String
:
VOUT
21, 22, 23, 24,
25 (Exposed Pad) GND
ILED (mA) =
20 x 4.75
RISET (kΩ)
Note :
Due to the limitation of maximum duty, 5V input can support typically to VOUT = 33V.
Figure 1. 1MHz, 20mA Full Scale Current PWM Dimming Control
Function Block Diagram
LX
VCC
OVP
EN
CREG
VC
SS
ACTL
GND
4.2V
1.2V
-
+
+
-
OSC
S
R
R
1.6V
-
+ Shutdown
5V
LDO
VOUT
Regulation
Unit
5µA
5V
+
-
+
-
+
-
+
+-
-
LED1
LED2
.
.
.
LED7
LED8
www.richtek.com
2
RISET
DS8561C-00 April 2011


Part Number RT8561C
Description High Voltage 8-CH LED Driver
Maker Richtek
Total Page 13 Pages
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