|
|
PDF CAT4026 Data sheet ( Hoja de datos )
| Número de pieza | CAT4026 | |
| Descripción | 6-Channel LED Controller | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de CAT4026 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
CAT4026
6-Channel LED Controller
with Fault Diagnostics for
Large Panel LED
Backlighting
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.
Features
• 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
• LCD−TV LED Backlighting
• LED General Lighting
http://onsemi.com
SOIC−28
V SUFFIX
CASE 751BM
PIN CONNECTIONS
VDD
1 28 GND
PWM
2
27 SCA
ANLG
3
26 VCS
BASE1
4
25 BASE6
RSET1
5
24 RSET6
BASE2
6
23 BASE5
RSET2
7
22 RSET5
BASE3
8
21 BASE4
RSET3
9
20 RSET4
OCA
10
19 FLT−OCA
C1 11
18 C3
N.C.
12
17 FLT−SCA
VA 13
16 IFB
N.C.
14
15 VC
(Top View)
MARKING DIAGRAM
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
Device
CAT4026V−T1
(Note 1)
Package
SOIC−28
(Pb−Free)
Shipping
1,000/
Tape & Reel
1. Matte Tin Plated Finish (RoHS−compliant)
© Semiconductor Components Industries, LLC, 2011
May, 2011 − Rev. 5
1
Publication Order Number:
CAT4026/D
1 page  
CAT4026
TYPICAL PERFORMANCE CHARACTERISTICS
(VDD = VPWM = 5 V, VANLG = 3.3 V, TAMB = 25°C unless otherwise specified.)
1.4 16
1.2 VIH
1.0
VIL
0.8
0.6
12
25°C
−40°C
8 125°C
0.4 4 80°C
0.2
0
−40 −10 20 50 80 110
TEMPERATURE (°C)
Figure 3. PWM Threshold Voltage vs.
Temperature
140
0
4.50 4.75 5.00 5.25 5.50
VDD VOLTAGE (V)
Figure 4. Quiescent Current vs. Temperature
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
2.0 2.5 3.0 3.5 4.0 4.5
VCS VOLTAGE (V)
Figure 5. IFB Sink Current vs. VCS Voltage
1.02
1.01
RSETX = 1 kW
1.00
0.99
0.98
0.97
0.96
0.95
−40
−10 20 50 80 110
TEMPERATURE (°C)
Figure 6. RSET Voltage vs. Temperature
140
120
100
80
60
40
20
0
0 12 3
ANLG VOLTAGE (V)
Figure 7. LED Brightness vs. ANLG Voltage
4
1.0
0.8
0.6 Ch2
0.4 Ch6
0.2 Ch4
0
−0.2
−0.4
Ch5
Ch1
−0.6
Ch3
−0.8
−1.0
3 6 9 12 15 18 21
CATHODE VOLTAGE (V)
Figure 8. Matching Channel−to−Channel vs.
Cathode Voltage
http://onsemi.com
5
5 Page 
Simplified Block Diagram
CAT4026
ANLG
100 k
50 k
PWM
SCA
OCA
C3
VCS
C1
VDD
GND
5V
− CH−BIAS
+ (1 V−CLAMP)
SHUTDOWN
TIMER
ENABLE
CH[1:6]
+
−
SHORT
DETECT
+
−
1V
FAULT
DETECT
CH−PWM
OPEN
SHORT
−
4.1 V
1 mA/V
+
500 mV
3.6 V
CATHODE
DETECT
CH−PWM
3.6 V−nom
0.6 V
3V
Ref
15 mA−max
BASE[1:6]
RSET[1:6]
LATCHED
NOT−LATCHED
FLT−OCA
FLT−SCA
1 mA_max
+
−
IFB1
0.5X
1.8 V
VA
0.5X
1.8 V−nom
VC
Figure 17. Simplified Block Diagram
http://onsemi.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CAT4026.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| CAT4026 | 6-Channel LED Controller | ON Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |