ON CAT4026V-T1 6-channel led controller with fault diagnostics for large panel led backlighting Datasheet

CAT4026
6-Channel LED Controller
with Fault Diagnostics for
Large Panel LED
Backlighting
http://onsemi.com
Description
The CAT4026 is a high performance, large panel LED controller
designed to control six constant current high voltage LED strings.
Added control circuitry monitors the lowest cathode voltage and
generates a feedback control signal to an external Switch Mode Power
Supply (SMPS) to provide a low cost and efficient solution for large
panel high voltage LED backlighting.
Each LED channel current is accurately matched and controlled by
sensing an external resistor in series with a low cost bipolar power
transistor. This allows current and heat dissipation concerns to be
mitigated from the CAT4026 device package.
For added system reliability, both Open−Cathode−Anode (OCA)
and Shorted−Cathode−Anode (SCA) fault detection circuitry has been
included along with independent Fault flag logic outputs for
diagnostic purposes.
LED current dimming in all six channels can be precisely controlled
by either a Pulse Width Modulation signal via the PWM input pin or
by an analog dimming voltage applied at the ANLG pin. In addition
the ANLG pin provides a convenient method for limiting the overall
maximum power dissipation in the event of excessive LED shorting
within any LED string.
The device will automatically enter low current shutdown mode by
taking the PWM pin low for an extended length of time.
PIN CONNECTIONS
VDD
PWM
ANLG
BASE1
RSET1
BASE2
RSET2
BASE3
RSET3
OCA
C1
N.C.
VA
N.C.
1
GND
SCA
VCS
BASE6
RSET6
BASE5
RSET5
BASE4
RSET4
FLT−OCA
C3
FLT−SCA
IFB
VC
(Top View)
MARKING DIAGRAM
Features
•
•
•
•
•
•
•
•
•
•
SOIC−28
V SUFFIX
CASE 751BM
6 Channel LED Controller
Adaptive Feedback Control to External SMPS for Better Efficiency
PWM and Analog Mode Dimming
Short Cathode−Anode (SCA) Fault Protection
Open Cathode−Anode (OCA) Fault Protection
Over−Voltage Protection
Thermal Shutdown Protection
Automatic Inactivity Power Down Mode
SOIC−28L Package
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Typical Applications
L3A
CAT4026V
YYWWXXXX
L
= Assembly Location Code
3
= Mark “3” for (lead finish Matte−Tin)
A
= Product Revision: Fixed as “A”
CAT4026V = Specific Device Code
YY
= Production Year (Last Two Digits)
WW
= Production Week (Two Digits)
XXXX
= Last Four Digits of Assembly Lot Number
ORDERING INFORMATION
• LCD−TV LED Backlighting
• LED General Lighting
Device
CAT4026V−T1
(Note 1)
Package
Shipping
SOIC−28
(Pb−Free)
1,000/
Tape & Reel
1. Matte Tin Plated Finish (RoHS−compliant)
© Semiconductor Components Industries, LLC, 2010
February, 2010 − Rev. 2
1
Publication Order Number:
CAT4026/D
CAT4026
Example of Ordering Information (Note 4)
2.
3.
4.
5.
6.
Prefix
Device #
Suffix
CAT
4026
V
−
T1
Company ID
(Optional)
Product Number
4026
Package
V: SOIC−28L
Lead Finish
Blank: Matte Tin
Tape & Reel (Note 6)
T: Tape & Reel
1: 1,000 / Reel
All packages are RoHS−compliant (Lead−free, Halogen−free).
The standard lead finish is Matte Tin.
The device used in the above example is a CAT4026V−T1 (SOIC−28L, Matte Tin, Tape & Reel, 1,000/Reel).
For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada
Email: [email protected]
N. American Technical Support: 800−282−9855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81−3−5773−3850
http://onsemi.com
2
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative
CAT4026/D
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