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PDF RT8566 Data sheet ( Hoja de datos )
| Número de pieza | RT8566 | |
| Descripción | High Voltage 8-CH LED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT8566
High Voltage 8-CH LED Driver
General Description
The RT8566 is an 8-CH LED driver capable of delivering
120mA for each channel. The RT8566 is a current mode
boost converter with an adjustable switching frequency
via the RT 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
RT8566 automatically detects and disconnects any
unconnected and/or broken strings during operation from
PWM loop to prevent VOUT from over voltage. The 1.5%
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 status signal will be sent to the system to shut down
the IC.
The RT8566 is available in a TSSOP-28 (Exposed Pad)
package.
Ordering Information
RT8566
Package Type
CP : TSSOP-28 (Exposed Pad-Option 1)
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
RT8566
GCPYMDNN
RT8566GCP : Product Number
YMDNN : Date Code
Features
Wide Input Supply Voltage Range : 9V to 28V
Adjustable Boost Controller Switching Frequency
from 100kHz to 1MHz
Programmable Channel Current
Channel Current Matching : ±1.5%
External Dimming Control
Boost MOSFET Over Current Protection
Automatic LED Open/Short Protection to Avoid
Output Over Voltage
VCC Under Voltage Lockout
Adjustable Over Voltage Protection
Under Voltage Protection
Thermal Shutdown Protection
Abnormal Status Indicator for Open/Short/Thermal
Condition
RoHS Compliant and Halogen Free
Applications
LCD TV, Monitor Display Backlight
LEDDriver Application
General Purpose Constant Current Source
Pin Configurations
(TOP VIEW)
OVP/UVP
RISET
NC
PWM
NC
STATUS
NC
RT
VC
SS
EN
SEN
PGND
DRV
28
2 27
3 26
4 25
5 24
6 23
7 GND 22
8 21
9 20
10 19
11 18
12 17
13 29 16
14 15
GND
GND
GND
GND
LED1
LED2
LED3
LED4
LED5
LED6
LED7
LED8
VCC
CREG
TSSOP-28 (Exposed Pad)
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8566-03 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT8566
Absolute Maximum Ratings (Note 1)
Supply Voltage, VCC , STATUS ----------------------------------------------------------------------------------------- 33V
LED1 to LED8 --------------------------------------------------------------------------------------------------------------- 50V
PWM, EN, DRV, SEN, SS, VC, RT, CREG, OVP/UVP, RISET ------------------------------------------------- 5.5V
Power Dissipation, PD @ TA = 25°C
TSSOP-28 (Exposed Pad) ----------------------------------------------------------------------------------------------- 3.571W
Package Thermal Resistance (Note 2)
TSSOP-28 (Exposed Pad), θJA ------------------------------------------------------------------------------------------ 28°C/W
TSSOP-28 (Exposed Pad), θJC ----------------------------------------------------------------------------------------- 7°C/W
Junction Temperature ------------------------------------------------------------------------------------------------------ 150°C
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------- 260°C
Storage Temperature Range --------------------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ----------------------------------------------------------------------------------------------- 2kV
MM (Machine Model) ------------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions (Note 4)
Supply Voltage, VCC ------------------------------------------------------------------------------------------------------- 9V to 28V
LED1 to LED8 --------------------------------------------------------------------------------------------------------------- 45V
Junction Temperature Range --------------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VCC = 12V, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Supply Voltage
Supply Current
Shutdown Current
VDD LDO Output
VDD LDO Capability
IVCC
ISHDN
VCREG
ICREG
VCC UVLO Threshold
VUVLO
EN Input
Logic-High
Threshold Voltage Logic-Low
LED Current Programming
LED Current Accuracy
VENH
VENL
LED Current Matching
LED1 to LED8 Regulation
Voltage
Test Conditions
Switching Off
VEN 0.7V
VCC Rising
Hysteresis
RISET = 4.53k, VPWM 1.2V
RISET = 4.53k, VPWM 1.2V
I(MAX) I(MIN)
2 I(Avg)
100%
ILED = 120mA
Min Typ Max Unit
-- 5 -- mA
-- -- 10 A
-- 5 -- V
30 --
-- mA
-- -- 8
-- 1.4 --
V
1.5 -- -- V
-- -- 0.8 V
114 120 126 mA
-- 1.5 3 %
-- 0.6 --
V
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8566-03 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT8566
The compensation OVP/UVP
circuit should be kept RISET
away from the power
NC
loops and shielded
PWM
with a ground trace
NC
to prevent any noise STATUS
coupling.
NC
RT
VC
GND CC RC
SS
EN
VOUT
SEN
PGND
DRV
D1
COUT
RDRV
RF2 RF1
CF
28
2 27
3 26
4 25
5 24
6 23
7 GND 22
8 21
9 20
10 19
11 18
12 17
13 29 16
14 15
L1
MSW CIN
RSENSE
GND
GND
GND
GND
LED1
LED2
LED3
LED4
LED5
LED6
LED7 Locate CVCC as close
LED8 to VCC as possible.
VCC
CREG
CVCC
VIN
GND
+
VIN
PGND
Place the power
components as close as
possible to the IC. The
traces should be wide
and short especially for
the high-current loop.
Figure 4. PCB Layout Guide
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8566-03 November 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT8566.PDF ] | |
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