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PDF SCT2024 Data sheet ( Hoja de datos )
| Número de pieza | SCT2024 | |
| Descripción | 16-bit Serial-In/Parallel-Out Constant-Current LED Driver | |
| Fabricantes | StarChips | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SCT2024 (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
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StarChips
Technology
SCT2024 V01_03; May/11
16-bit Serial-In/Parallel-Out Constant-Current LED Driver
Product Description
The SCT2024 serial interfaced LED driver sinks 16 LED clusters with constant current to keep the
uniform intensity of LED displays. In applications, an external resistor is used to set the full scale
constant output current from 5mA up to 45mA. The SCT2024 guarantees each output can endure
maximum 17V DC voltage stress. The built in shift registers and data latches making the SCT2024
effective solution in driving LED display. The output enable function gates all 16 outputs on and off, and
is fast enough to be used as PWM input for LED intensity control. Since the serial data input rate can be
reached up to 25MHz, the SCT2024 will satisfy system which needs high volume data transmission to
control the LED display. Furthermore, the SCT2024 provides excellent temperature regulation thus it
can be applied to varied of operating temperature.
Features
16 robust constant current sinker with LED power supply voltage up to 17V
Constant output current : 5 – 30/[email protected]/5V
Wide power supply voltages: 3.3V to 5V
Excellent regulation to load, supply voltage and temperature
Temperature regulation: ±0.005%/°C,
Load regulation: ±0.1%/V
Line regulation: ±0.5%/V
High current matching accuracy: ±1% between outputs, ±2% between ICs
Fine grayscale response with 180ns PWM pulse width
Dropout voltage 0.5V@20mA, VDD=5V
CMOS Schmitt trigger inputs with clock rate up to 25MHz @ cascade connection
The constant current value of 16 outputs is set by a single external resistor
Interlaced 30ns delay of output, preventing instant current surge and output bouncing overstress
Built in power on reset(POR) circuit forces all the outputs off while power on
Package: SSOP24, SSOP24 1, SOP24 and TQFN24
Applications: LED Displays, Variable Message Signs, Illumination, LED Traffic Signs
Page 1 of 21
1 page  
16-bit Serial-In/Parallel-Out Constant-Current LED Driver
SCT2024
Truth Table
CLK
LA/ OE/
HL
LL
HL
XL
XH
Timing Diagram
SDI
Dn
Dn+1
Dn+2
Dn+3
Dn+3
OUT0 ~ OUT15
Dn Dn 1
Dn 14 Dn 15
No change
Dn+2
Dn+2
Dn+1
Dn+1
Dn 12
Dn 12
Off
Dn 13
Dn 13
SDO
Dn 15
Dn 14
Dn 13
Dn 13
Dn 13
CLK
SDI
LA/
OE/
OUT0
(LSB)
OUT1
OUT2
OUT33
OUT12
OUT13
OUT14
OUT15
(MSB)
SDO
0 1 2 3 12 13 14 15
D15(MSB)=0 D14=1
D13=1
D12 3=0
D2=1
D1=0
D0(LSB)=1
Previous data
D15(MSB)=0
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Page 5 of 21
5 Page 
16-bit Serial-In/Parallel-Out Constant-Current LED Driver
SCT2024
SCT2024 IOUT vs. VOUT@3.3V,TA=25°C
45
40
35
30
25
20
15
10
5
0
0
1
VOU2T(V)
3
4
Excellent Temperature Regulation
The constant current driver requires not only the characteristics of supply and load voltage
independence, but also temperature invariance. A well thermal stable reference circuit is designed within
the SCT2024. Users can get the stable output current over recommended current range
IOUT=5mA~45mA with ambient temperature (TA) widely varying from 40°C to 85°C.
SCT2024 IOUT vs. TA@5V
50
40
30
20
10
0
:40 :20 0 20 40 60 80
TA(°C)
Page 11 of 21
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet SCT2024.PDF ] | |
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