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  Richtek Technology Electronic Components Datasheet  

RT8560 Datasheet

High Voltage 4 Channel LED Driver

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RT8560
High Voltage 4 Channel LED Driver
General Description
The RT8560 is a 60V 4-channel LED driver capable of
delivering 30mA to each channel with 15 LEDs (3.6V per
diode) total 60 LEDs with one driver. The RT8560 is a
current mode boost converter opearated at 1MHz switching
frequency, wide VIN range covers from 7V to 40V and the
on-chip current switch is rated at 1.5A.
The PWM output voltage loop selects and regulates the
LED pin with the highest voltage string to 0.9V allowing
voltage mismatches between LED strings. The RT8560
automatically detects and disconnects any unconnected
and/or broken strings during operation from PWM loop to
prevent VOUT from over voltage.
The 3% 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 RT8560. Analog dimming is linearly
controlled by an external voltage. With an on-chip output
clampping amplifier and a 200kΩ 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 EN pin to PWM
shutdown the chip or by driving ACTL pin.
Other protecting features include programmable PWM
output over voltage protection, LED curren limit, PWM
switch current limit and thermal shutdown. The RT8560
is packaged with a tiny footprint package of WQFN-20L
4x4 packages.
Pin Configurations
(TOP VIEW)
20 19 18 17 16
GND 1
15 LED4
GND 2
14 VC
GND 3
GND
13 SS
SW 4
21 12 OVP
SW 5
11 EN
6 7 8 9 10
WQFN-20L 4x4
DS8560-01 April 2011
Features
z High Voltage : VIN up to 40V, VOUT up to 60V, Driving
up to 60 x 3.6V LEDs (15 each channel)
z Channel Current Programmabe 4mA to 30mA and
Matched to 3% Accuracy
z Current Mode PWM 1MHz Boost Converter
z Easy Analog and Digital Dimming Control
z Programmable Soft Start
z Automatic Detecting Unconnected and/or Broken
Channel
z Programmable Over Voltage Protection
z Disconnects LED in Digital Dimming : Providing
High Accuracy Digital Dimming by PWM at ACTL
Pin or EN Pin
z VIN Under Voltage Lockout
z Over Temperature Protection
z Current Limiting Protection
z Small 20-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
Ordering Information
RT8560
Package Type
QW : WQFN-20L 4x4 (W-Type)
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
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
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8560 Datasheet

High Voltage 4 Channel LED Driver

No Preview Available !

RT8560
Typical Application Circuit
VIN
7V to 40V
COUT3
1µF
L
10µH
D
VOUT
60V MAX
RVCC1
10
CVIN
10µF
C2 R4
15 LED String
::
::
RT8560
::
::
4, 5 SW
::
::
::
::
COUT1 COUT2
7 VCC1
CVCC1
R3
1µF 5V 1k 11 EN
LED1 18
LED2 17
LED3 16
VOUT
R1 12 OVP
R2
LED4 15
RISET 8
RISET
5.36k
ILED = 20mA × 5.36k
RISET
RVCC2
VIN 10
6 VCC2
ACTL 9
R5
1k
CVCC2
1µF
DCTL 10
PWM Signal
RVC
1.8k
CVC
3.9nF
14 VC
13 SS
C1
0.1µF
GND 1, 2, 3, 19, 20, Exposed Pad (21)
Figure 1. 1MHz, 20mA Full Scale Current Digital PWM Dimming Control
VIN
7V to 40V
COUT3
1µF
L
10µH
D
VOUT
60V MAX
RVCC1
10
CVIN
10µF
C2 R4
15 LED String
::
::
RT8560
::
::
4, 5 SW
::
::
::
::
7 VCC1
CVCC1
1µF 5V
R3
1k
11 EN
LED1 18
LED2 17
LED3 16
COUT1 COUT2
VOUT
VIN
R1
RVCC2
10
RVC
1.8k
CVC
3.9nF
12 OVP
R2
6 VCC2
CVCC2
1µF
14 VC
13 SS
C1
0.1µF
LED4 15
RISET 8
RISET
5.36k
ILED = 20mA × 5.36k
RISET
ACTL 9
DCTL 10
R5
1k Analog
Dimming
GND 1, 2, 3, 19, 20, Exposed Pad (21)
www.richtek.com
2
Figure 2. 1MHz, 20mA Full Scale Current Analog Dimming Control
DS8560-01 April 2011


Part Number RT8560
Description High Voltage 4 Channel LED Driver
Maker Richtek
PDF Download

RT8560 Datasheet PDF






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