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  Richtek Technology Electronic Components Datasheet  

RT8576 Datasheet

High Voltage 8-CH LED Driver

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RT8576
High Voltage 8-CH LED Driver
General Description
The RT8576 is an 8-CH LED driver capable of delivering
120mA for each channel. The RT8576 is a current mode
boost converter with an adjustable switching frequency
via the OSC pin from 100kHz to 1MHz and a wide VIN
range from 9V to 28V.
The PWM output voltage loop selects and regulates the
LED pin with the highest voltage string to 0.6V, hence
allowing voltage mismatches between LED strings. The
RT8576 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. A very high contrast ratio true
digital PWM dimming can be achieved by driving the PWM
pin with a PWM signal.
When an abnormal situation (open/short/thermal) occurs,
a state signal will be sent to the system to shut down the
IC.
The RT8576 is available in TSSOP-24 (Exposed Pad) and
SOP-24 packages.
Ordering Information
RT8576
Package Type
CP : TSSOP-24 (Exposed Pad)
S : SOP-24
Lead Plating Systeme
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.
Features
z Wide Input Supply Voltage Range : 9V to 28V
z Adjustable Boost Controller Switching Frequency
from 100kHz to 1MHz
z Programmable Channel Current
z Channel Current Matching : ±3%
z External Dimming Control
z Boost MOSFET Over Current Protection
z Automatic LED Open/Short Protection to Avoid
Output Over Voltage
z VIN Under Voltage Lockout
z Adjustable Over Voltage Protection
z Under Voltage Protection
z Thermal Shutdown Protection
z Abnormal State Indicator for Open/Short/Thermal
Condition
z RoHS Compliant and Halogen Free
Applications
z LCD TV, Monitor Display Backlight
z LEDDriver Application
z General Purpose Constant Current Source
Marking Information
RT8576GCP
RT8576
GCPYMDNN
RT8576GCP : Product Number
YMDNN : Date Code
RT8576GS
RT8576
GSYMDNN
RT8576GS : Product Number
YMDNN : Date Code
DS8576-00 April 2011
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT8576 Datasheet

High Voltage 8-CH LED Driver

No Preview Available !

RT8576
Pin Configurations
PWM
OUT1
OUT2
OUT3
OUT4
GND
OUT6
OUT7
OUT8
OUT5
OVS
ISET
24
2 23
3 22
4 21
5 20
6 GND 19
7 18
8 17
9 16
10 15
11 25 14
12 13
STATE
NC
COMP
NC
SS
VIN
PGND
VCCA
EXT
CS
EN
OSC
TSSOP-24 (Exposed Pad)
(TOP VIEW)
PWM
OUT1
OUT2
OUT3
OUT4
GND
OUT8
OUT6
OUT7
OVS
ISET
OSC
24
2 23
3 22
4 21
5 20
6 19
7 18
8 17
9 16
10 15
11 14
12 13
SOP-24
STATE
NC
COMP
NC
SS
VIN
PGND
VCCA
EXT
OUT5
CS
EN
Typical Application Circuit
VIN
9 to 28V
L1
10µH
CIN
47µF
D1
CVIN
1µF
OVS
VIN
RT8576
MSW
RF
100
RSENSE
REXT
5
CS
C1nFF
EXT
OUT1
OUT4
OUT5
OUT6
OUT8
PWM Signal
1k PWM
STATE
Chip Enable
1k EN
CC1
0.22µF
5R6C0
CC2
NC
COMP
ISET
OSC
SS
VCCA
ROVP2
3.6M
ROVP1
82k
:
:
:
:
……
::
:
:
:
:
:
:
RSTATE
100k
RISET
4.53k
ROSC 56k
CSS 0.1µF
CREG 1µF
VIN
FLT
:
:
:
:
……
:
:
:
:
VOUT
45V
COUT
4.7µF x 8
PGND GND
www.richtek.com
2
Figure 1. General Application
DS8576-00 April 2011


Part Number RT8576
Description High Voltage 8-CH LED Driver
Maker Richtek
Total Page 14 Pages
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