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PDF SCT2167 Data sheet ( Hoja de datos )
| Número de pieza | SCT2167 | |
| Descripción | 8-bit Serial-In/Parallel-Out Constant Current Driver | |
| Fabricantes | StarChips | |
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StarChips
Technology
SCT2167 V01_02; Jul/12
8-bit Serial-In/Parallel-Out Constant Current Driver
Product Description
The SCT2167 serial interfaced LED driver sinks 8 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 SCT2167 guarantees each output can endure
maximum 17V DC voltage stress. The built in shift registers and data latches making the SCT2167
effective solution in driving LED display. The output enable function gates all 8 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 SCT2167 will satisfy system which needs high volume data transmission to
control the LED
Features
8 constant current sinkers with output voltage sustainable to 17V
Constant output current : 5 – 30/[email protected]/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 8 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: SSOP16 and SOP16
Applications: LED Displays, Variable Message Signs, Illumination, LED Traffic Signs
1 page  
8-bit Serial-In/Parallel-Out Constant Current Driver
SCT2167
Maximum Ratings (TA = 25°C)
Characteristic
Symbol
Rating
Unit
Supply voltage
Input voltage
Output current
Output voltage
Outputs
OUT0~OUT7
VDD
VIN
IOUT
VOUT
7.0
0.2 ~ VDD+0.2
60
0.2 ~ VDD+0.2
0.2 ~ 17
V
V
mA/Channel
V
V
Total GND terminals current
Power dissipation
SSOP16
SOP16
IGND
PD
480
1.07
1.47
mA
W
Thermal resistance
SSOP16
SOP16
RTH(j a)
117
85
°C /W
Operating junction temperature
TJ(max)
150
°C
Operating temperature
TOPR
40~+85
°C
Storage temperature
TSTG
55~+150
°C
The absolute maximum ratings are a set of ratings not to be exceeded. Stresses beyond those listed under “Maximum Ratings”
may cause the device breakdown, deterioration even permanent damage. Exposure to the maximum rating conditions for
extended periods may affect device reliability.
Recommended Operating Conditions (TA= 40 to 85°C unless otherwise noted)
Characteristic Symbol
Conditions
Min. Typ. Max. Unit
Supply voltage
Output voltage
VDD
VOUT
Output OFF
Output ON
3 5.5 V
17
11 42
V
V
Output current
IOUT VDD=3.3/5V, VOUT=1V
5
30/45 mA
Input voltage
VIH
VIL
input signals
0.7VDD
0
VDD
0.3VDD
V
V
OE/ pulse width
tW(OE)
VDD=3.3V/5V
180
ns
1. The output current keep constant in range of 5 45mA if VOUT=1V.
However, user can minimize VOUT to reduce power dissipation according to used current, e.g., set VOUT to 0.6V if IOUT=20mA.
2. The maximum Vout is package thermal limited, user should keep Vout under maximum power dissipation.
Page 5 of 16
5 Page 
8-bit Serial-In/Parallel-Out Constant Current Driver
SCT2167
Power Dissipation
The maximum power dissipation (PD(max)) of a semiconductor chip varies with different packages and
ambient temperature. It’s determined as PD(max)=(TJ(max) –TA)/RTH(j a) where TJ(max): maximum chip junction
temperature is usually considered as 150°C, TA: ambient temperature, RTH(j a): thermal resistance. Since
P=IV, for sinking larger IOUT, users had better add proper voltage reducers on outputs to reduce the heat
generated from the SCT2167.
SCT20167 PD(max) vs. TA
2
1.5 SOP16:RTH(j0a)=85°C/W
SSOP16:RTH(j0a)=117°C/W
1
0.5
0
940 930 920 910 0 10 20 30 40 50 60 70 80 90 100
TA (°C)
Limitation on Maximum Output Current
The maximum output current vs. duty cycle is estimated by:
IOUT(max)=(((TJ(max) TA)/RTH(j a)) (VDD*IDD))/VOUT/Duty/N where TJ(max)=150°C, N=8(all ON)
50 SCT2167 IOUT(max) vs. Duty @SSOP16:117OC/W
45
VO UT =4V
VO UT =3V
40
VO UT =4V VO UT =3V
VO UT =2V
35
30
25
20 TA=85°C
15 TA=25°C
10
0 10 20 30 40 50 60 70 80 90 100
Duty(%)
Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet SCT2167.PDF ] | |
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