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PDF RT8464 Data sheet ( Hoja de datos )
| Número de pieza | RT8464 | |
| Descripción | Isolated Secondary Side 6-CH LED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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®
RT8464
Isolated Secondary Side 6-CH LED Driver with Optocoupler
Driver
General Description
The RT8464 is an isolated secondary side 6-CH LED driver
that delivers well matched LED current to each channel of
LED strings. A built-in optocoupler driver supports the
transformer primary side control circuit to regulate the
LED current.
The LED current is linearly controlled by a high gain amplifier
that drives the optocoupler to control the primary side,
thus making the conventional secondary DC/DC PWM
switching stage unnecessary. The RT8464 selects and
regulates the LED strings with the highest voltage, hence
it allows voltage mismatches between LED strings. The
RT8464 automatically detects and disconnects any
unconnected and/or broken strings during operation from
the PWM loop to prevent VOUT from over voltage.
The LED currents on all channels can be simply
programmed with a resistor on each channel. Three
convenient dimming methods are provided : 1. Analog
dimming is linearly controlled by an external voltage; 2.
True digitally controlled PWM dimming controls duty cycle
of LED current; 3. PWM dimming signal can also be easily
filtered into analog dimming signal for noise-free PWM
dimming by the low pass filter with an external capacitor
at ACTL pin. Other protecting features include output over
voltage protection and thermal shutdown.
The RT8464 is available in the SOP-28 package.
Features
z High Voltage : VCC up to 32V
z Channel Current Programmable
z 3% Current Sense Threshold Voltage
z Easy Analog and Digital Dimming Control
z Adjustable Soft-Start to Avoid Inrush Current
z Automatic Detecting Unconnected Channel
z Adjustable Over Voltage Protection to Limit Output
Voltage
z Thermal Shutdown Under Voltage Lockout
z SOP-28 Package
z RoHS Compliant and Halogen Free
Applications
z Building and Street Lighting
z LED TV Backlight
z LED Monitor Backlight
z Industrial Display Backlight
Simplified Application Circuit
Isolation Barrier
VIN
Primary Side
Controller
Dimming Signal
EN RT8464
VCC
VC
SS
LEDx
GATEx
ACTL SENSEx
OPTO
GND
RSENSE
x6
x6
x6
x6
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8464-00 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT8464
Parameter
Optocoupler Driver
OPTO Low Voltage
LED Current Sources Gate Driver
GATEx High Voltage
GATEx Low Voltage
OVP and Soft-Start
OVP Threshold
OVP Input Current
Soft-Start Current at SS
Thermal Protection
Thermal Shutdown Temperature
Symbol
Test Conditions
IOPTO = 2mA, VVC = 1.6V
IGATEx = −1mA
IGATEx = −0.1mA
IGATEx = 1mA
IGATEx = 0.1mA
VOVP
VOVP ≤ 1.2V
VSS ≤ 2.5V
TSD
Min Typ Max Unit
-- 0.15 --
V
4.2 4.8
--
4.5 5
--
-- 0.8 1.1
-- 0.7 1
V
V
1.17 1.2 1.25 V
-- -- −100 nA
-- 6 -- μA
-- 150 --
°C
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2. θJA is measured at TA = 25°C on a low effective thermal conductivity single-layer test board per JEDEC 51-3.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8464-00 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
Outline Dimension
A
RT8464
H
M
JB
F
C
I
D
Symbol
A
B
C
D
F
H
I
J
M
Dimensions In Millimeters
Min Max
17.704
18.110
7.391
7.595
2.362
2.642
0.330
0.508
1.194
1.346
0.229
0.330
0.102
0.305
10.008
10.643
0.381
1.270
Dimensions In Inches
Min Max
0.697
0.713
0.291
0.299
0.093
0.104
0.013
0.020
0.047
0.053
0.009
0.013
0.004
0.012
0.394
0.419
0.015
0.050
28–Lead SOP Plastic Package
Richtek Technology Corporation
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789
Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should
obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot
assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be
accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries.
DS8464-00 November 2012
www.richtek.com
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet RT8464.PDF ] | |
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