SI4442DY [VISHAY]
N MOS; ñ MOS
| 型号： | SI4442DY |
| 厂家： | 
VISHAY |
| 描述： | N MOS |
| 文件： | 总13页 (文件大小：271K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
StarChips
Technology
SCT2001 V02_03; May/13
3-Channel Constant Current Driver
Product Description
The SCT2001 is designed to drive multiple LEDs in series from a high input voltage rail. The SCT2001
contains three output channels which are regulated to sink constant current for driving LEDs of large
range VF variations.
In the field of LEDs driving applications, users can simply adjust the output current from 10 mA to 45 mA
through an external resistor RADJ to control the light intensity of LEDs. The SCT2001 guarantees to
endure maximum DC 24V at each output port.
Features
©
©
©
©
©
©
©
©
©
©
©
©
©
Three constantꢀcurrent outputs rate at 24V
Constant current range:10 – 45mA
Wide operating operation by adding resistor from high rail to supply input
±2%(typ) current matching between outputs
±4%(typ) current matching between ICs
Smart dimming control via ADJ pin
Low dropꢀout output 0.3V@20mA
Excellent current regulation to load, supply voltage and temperature
All output current are adjusted through one external resistor
Hysteresis input for ADJ external resistor
Builtꢀin power on reset and thermal protection function
Package: Small 2mmx2mm DFN and SOTꢀ236
Applications: Mini light bar, LED backlight, LED lamp
Pin Configurations
1
2
3
6
5
4
1
2
3
6
5
4
ADJ
GND
VDD
OUT0
OUT1
OUT2
VDD
ADJ
OUT0
OUT2
OUT1
GND
SOTꢀ236
DFN6
Page 1 of 13
3-Channel Constant Current Driver
SCT2001
Terminal Description
For SOTꢀ236/DFN6
Pin No.
Pin Name
Function
SOTꢀ236
DFN6
1
2
3
4
5
6
2
4
1
6
5
3
ADJ
GND
VDD
Input terminal used to set up all output current
Ground terminal
Supply voltage terminal
Output terminal 2
OUT2
OUT1
OUT0
Output terminal 1
Output terminal 0
Ordering information
Part
Marking
2001
01A
Package
Green SOTꢀ236
Green DFN6
Unit per reel(pcs)
SCT2001AS1G
SCT2001ADNG
3000
3000
StarChips Technology, Inc.
4F, No.5, Technology Rd., ScienceꢀBased Industrial Park, HsinꢀChu, Taiwan, R.O.C.
Tel : +886ꢀ3ꢀ577ꢀ5767 Ext.555
Fax: +886ꢀ3ꢀ577ꢀ6575
Eꢀmail : service@starchips.com.tw
Block Diagram
OUT0 OUT1 OUT2
Current
ADJ
Output Driver
Regulator
SCT2001
Page 2 of 13
3-Channel Constant Current Driver
SCT2001
Maximum Ratings (TA = 25°C)
Characteristic
Supply voltage(DC)
Input voltage
Symbol
VDD
Rating
Unit
V
17
ꢀ0.4 ~ VDD+0.4
60
VADJ
V
Output current
IOUT
mA
V
Output voltage
VOUT
IGND
24
Total GND terminals current
200
mA
SOTꢀ236
Power dissipation(on PCB)
DFN6
0.64
PD
W
2.16
SOTꢀ236
Thermal resistance(on PCB)
DFN6
195
RTH(jꢀa)
°C /W
58
Operating temperature
Storage temperature
TOPR
TSTG
ꢀ40~+85
ꢀ55~+150
°C
°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.
15
24
4
Unit
V
Supply voltage(DC)
VDD
5
ꢀ
ꢀ
ꢀ
Output OFF
Output ON
DC test circuit
VDD=5ꢀ15V
VDD=5ꢀ15V
VDD=5ꢀ15V
V
Output voltage
VOUT
ꢀ
1
ꢀ
V
Output current
IOUT
tW
10
2
ꢀ
45
ꢀ
mA
us
us
us
Dimming pulse width
Dimming rise time
Dimming fall time
ꢀ
tR
ꢀ
1
tF
ꢀ
ꢀ
1
1.
The output current keep constant in range of 10ꢀ45mA if VOUT=1V.
However, user can minimize VOUT to reduce power dissipation according to used current, e.g., set VOUT to 0.3V if IOUT=20mA.
The maximum VOUT is package thermal limited, user should keep Vout under maximum power dissipation.
2.
Page 3 of 13
3-Channel Constant Current Driver
SCT2001
Electrical Characteristics (VDD=5ꢀ15V, VADJ=5V, R1=2K, TA=25°C unless otherwise specified)
Characteristic
Supply current
Symbol
IDD
Conditions
VDD=5/15V, R1=2K
ꢀ
Min.
Typ.
Max.
2
Unit
mA
V
ꢀ
1/1.5
VIH
2.5
ꢀ
ꢀ
ꢀ
ADJ input voltage
VIL
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
20
ꢀ
mV
mA
uA
mA
%
ADJ input current
Output leakage
IADJ
VADJ=5V, RADJ=4.8K
VADJ=0V, VOUT=24V,
RADJ=4.8K
1
IOL
ꢀ
0.5
ꢀ
Output current
IOUT
20
±2
±4
Current channel skew1
Current chip skew2
dIOUT1
dIOUT2
VOUT=1V,RADJ=4.8K
VOUT=1V,RADJ=4.8K
±3
±6
%
Line regulation3
IOUT vs. VDD
Load regulation4
IOUT vs. VOUT
5V < VDD < 15V, R1=2K
VOUT >1 V, RADJ=4.8K
%/dVDD
ꢀ
ꢀ
ꢀ
ꢀ
±1
±1
%/V
%/V
1V < VOUT < 4V,
IOUT=20mA, RADJ=4.8K
%/dVOUT
TH
TL
ꢀ
ꢀ
160
110
ꢀ
ꢀ
°C
°C
Thermal shutdown
Junction Temperature
1.
2.
3.
4.
Channel skew=(IOUTꢀIAVG)/IAVG, where IAVG=(IOUT(max)+ IOUT(min))/2
Chip skew=(IAVGꢀICEN) / ICEN*100(%), where ICEN is the statistics distribution center of output currents.
Line regulation=[IOUT(VDD=15V)ꢀIOUT(VDD=5V)] / {[IOUT(VDD=15V)+IOUT(VDD=5V)]/2} / (15Vꢀ5V)*100(%/V)
Load regulation=[IOUT(VOUT=4V)ꢀIOUT(VOUT=1V)] / {[IOUT(VOUT=4V)+IOUT(VOUT=1V)]/2} / (4Vꢀ1V)*100(%/V)
Test Circuit for Electrical Characteristics
VDD
R1
IDD
VOUT
VDD
1uF
OUT0
OUT1
VADJ
OUT2
IOUT
SCT2001
10uF
RADJ
ADJ
IADJ
GND
*Please add R1 during operation.
Page 4 of 13
3-Channel Constant Current Driver
SCT2001
Switching Characteristics (VDD=5ꢀ15V, R1=2K, TA=25°C unless otherwise noted)
Characteristic
Propagation delay time
Symbol
Conditions
Min.
Typ.
Max.
Unit
VLED = 5V
VIH = 5V
VIL= GND
VADJ= 5V
RADJ = 4.8Kꢁ
R1 = 2Kꢁ
C1 = 1uF
RL = 180ꢁ
CL = 10pF
CLED = 47uF
V
ADJ – VOUTn
VADJ ꢀ VOUTn
VADJ
tPLH
ꢀ
200
400
ns
(“L” to “H”)
Propagation delay time
(“H” to “L”)
tPHL
ꢀ
200
400
ns
Pulse width
tw
2
ꢀ
ꢀ
ꢀ
us
ns
Output rise time of IOUT
tOR
200
400
Output fall time of IOUT
tOF
ꢀ
200
400
ns
Test Circuit for Switching Characteristics
VDD
R1
IDD
VLED
VDD
C1
OUT0
OUT1
IOUT
VIH
VADJ
CLED
CL
RL
SCT2001
VIL
RADJ
IADJ
OUT2
tR = tF = 10 ns
ADJ
VOUT
GND
*Please add R1 during operation.
Timing Waveform
50%
50%
tW
VADJ
tPLH
tPHL
VOUTn
90%
90%
50%
10%
50%
10%
tOR
tOF
Page 5 of 13
3-Channel Constant Current Driver
SCT2001
Adjusting Output Current
The output current (IOUT) are set by one external resistor at pin ADJ. The relationship between IOUT
,
resistance RADJ and reference voltage VADJ is shown as the following figure. VADJ connected to a stable
reference voltage is suggested. Furthermore, IOUT could be estimated by ~ IOUT(A) = 20*VADJ / ( RADJ (ꢁ)
+ 200 ) (chip skew < ±6%, 1V < VOUT <4V).
SCT2001 IOUT vs. RADJ
70
VADJ=3.3V, VADJ=5V, VADJ=12V
60
50
40
1V<VOUT<4V
30
20
10
0
0
2
4
10
12
14
Ω 8
6RADJ(K )
Output Characteristics
The current characteristic of output curve is flat. The output current can be kept constant regardless of
the variations of LED forward voltage when VOUT > VDO(dropꢀout voltage). The relationship between IOUT
and VOUT is shown below. The output voltage should be kept as low as possible to prevent the SCT2001
from being overheated.
SCT2001 IOUT vs. VOUT
50
45
40
35
30
25
20
15
Drop-out voltage(VDO) is current dependent, e.g. VDO=0.3V@IOUT=20mA
10
5
0
0
1
2
3
4
5
VOUT(V)
Page 6 of 13
3-Channel Constant Current Driver
SCT2001
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(jꢀa) where TJ(max): maximum chip junction
temperature is usually considered as 150°C, TA: ambient temperature, RTH(jꢀa): 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 SCT2001.
SCT2001 PD(max) vs. TA
2.5
2
DFN6 : RTH(jꢀa) = 57.77 °C/W
1.5
1
SOTꢀ236 : RTH(jꢀa) = 195 °C/W
0.5
0
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(jꢀa))ꢀ(VDD*IDD))/VOUT/Duty/N Where TJ(max)=150°C, N=3(all ON)
SCT2001 IOUT(max) vs. Duty
50
VDD=12V, VOUT =4V, TA=85°C
DFN6
40
SOTꢀ236
30
20
0
10
20
30
40
50
60
70
80
90
100
Duty(%)
Page 7 of 13
3-Channel Constant Current Driver
SCT2001
Load Supply Voltage (VLED
)
The SCT2001 can be operated very well when VOUT ranges from 1V to 4V. However, it is recommended
to use the lowest possible supply voltage or set a voltage reducer to reduce the VOUT voltage, at the
same time reduce the power dissipation of the SCT2001. Follow the diagram instructions shown below
to lower down the output voltage. This can be done by adding additional resistor or zener diode, thus
VOUT=VLEDꢀVDROPꢀVF.
VLED
VLED
VDROP
VDROP
VF
VF
IOUT
IOUT
VOUT
VOUT
SCT2001
SCT2001
Over Temperature Shutdown
The SCT2001 contains thermal shutdown scheme to prevent damage from overꢀheating. The internal
thermal sensor turns off all outputs when the die temperature exceeds +160°C. The outputs are enabled
again when the die temperature drops below +110°C. During the thermal shutdown process, the LEDs
look blinking since it is turned OFF then ON periodically.
Page 8 of 13
3-Channel Constant Current Driver
SCT2001
Typical Application Circuits
(1) Typical lighting application
VDD
RDROP
R1
RADJ
CLED
VF
SCT2001
ADJ
GND
VDD
OUT0
OUT1
OUT2
1
2
3
6
5
4
IDD
C1
SOTꢀ236
The SCT2001 can operate with wide supply input range by shunting a resistor R1 to setup reference
current of internal shunt regulator. The shunt regulator like structure can diminish negative influence of
power bouncing or impact of instantly hot plug to system power. The calculation of R1 is approximately
expressed by: R1 ~ (VDDꢀ5V)/IDD(max)(2mA), the R1 at least 2K from supply input to the SCT2001 is
required. For example, if VDD=24V, set R1 ~ (24Vꢀ5V)/IDD(max)(2mA)=9.5K, a higher R1 e.g. 10K is
recommended; if VDD=12V, set R1 ~ (12Vꢀ5V)/IDD(max)=3.5K; however, if VDD=5V, set R1=2K directly.
(2) Typical lighting application (Zener diode as reference voltage)
VDD
RDROP
R1
IL
IZ
VADJ
IDD
C1
CLED
IADJ
VF
RADJ
SCT2001
ZD1
ADJ
GND
VDD
OUT0
OUT1
OUT2
1
6
5
4
2
3
SOTꢀ236
Since output current of SCT2001 is VADJ dependent, to have a constant output with the most economic
solution is by using zener diode as reference voltage VADJ. An adaptive value of R1 ~ (VDDꢀVZ)/IL is
needed, where IL = IZ + IDD + IADJ. If IZ ~ 1mA, VZ = 5.6V is selected, and VDD=12V, IOUT=20mA is
intended current, typically IADJ ~ IDD ~ 1mA in this case (VZ = 5.6V), thus R1 ~ (12Vꢀ5.6V)/3mA = 2.1K, a
lower R1 e.g. 2K is recommended.
Page 9 of 13
3-Channel Constant Current Driver
(3) Lighting with dimming control
VDD
SCT2001
VLED
R1 ref. circuit (1), (2)
RDROP
PWM Pulse
CLED
VF
RADJ
SCT2001
C1
ADJ
GND
VDD
OUT0
OUT1
OUT2
1
6
2
3
5
4
SOTꢀ236
Page 10 of 13
3-Channel Constant Current Driver
SCT2001
PCB Design Considerations
Use the following general guideꢀline when designing printed circuit boards (PCB) :
Decoupling Capacitor
Place a decoupling capacitor C1 e.g. 1uF between VDD and GND pins of the SCT2001. Locate the
capacitor as close to the SCT2001 as possible. The necessary capacitance depends on the LED load
current and dimming frequency. Inadequate VDD decoupling can cause timing problems, and very noisy
LED supplies can affect LED current regulation.
VLED
VDD
R1
RADJ
PWM
dimming
signal
VDD
ADJ
CLED
C1
SCT2001
SCT2001
Power and Ground
Maximizing the width and minimizing the length of VDD and GND trace improves efficiency and ground
bouncing by effect of reducing both power and ground parasitic resistance and inductance. An adaptive
value of resistor R1 in power input of the SCT2001 in conjunction with decoupling capacitor shunting the
IC is required. Separating and feeding the LED power from another stable supply terminal VLED
,
furthermore adding a capacitor CLED greater than 10uF beside the LED are recommended. Please adapt
CLED according to total system current consumption.
Page 11 of 13
3-Channel Constant Current Driver
SCT2001
Package Dimension
SOTꢀ236(check upꢀtoꢀdate version)
D
DETAIL A
b
6
5
4
1
2
3
c
e
e1
GAUGE PLANE
SEATING PLANE
θ
L
DETAIL A
L1
Dimension (mm)
Dimension (mil)
Symbol
Min.
ꢀ
0.00
0.90
0.30
0.08
Nom.
Max.
1.45
0.15
1.30
0.50
0.22
Min.
ꢀ
0.0
35.4
11.8
3.2
Nom.
Max.
57.1
5.9
51.2
19.7
8.7
A
A1
A2
b
ꢀ
ꢀ
ꢀ
ꢀ
1.15
ꢀ
ꢀ
45.3
ꢀ
ꢀ
c
D
E
E1
e
e1
L
2.90 BSC
2.80 BSC
1.60 BSC
0.95 BSC
1.90 BSC
0.45
114.2 BSC
110.2 BSC
63.0 BSC
37.4 BSC
74.8 BSC
17.7
0.30
0°
0.60
8°
11.8
0°
23.6
8°
L1
θ
0.60 REF
4°
23.6 REF
4°
Page 12 of 13
3-Channel Constant Current Driver
SCT2001
DFN6ꢀ2x2(check upꢀtoꢀdate version)
b
e
6
5
4
5
6
4
PIN1 ID AREA
PIN 1 ID
1
2
3
3
2
1
D
D1
e1
y
c
SEATING PLANE
Dimension (mm)
Nom.
Dimension (mil)
Nom.
Symbol
Min.
0.70
0.00
Max.
0.80
0.05
Min.
27.6
0.0
Max.
31.5
2.0
A
A1
A3
b
D
D1
E
E2
e
e1
L
0.75
0.02
0.20 REF
0.30
29.5
0.8
7.9 REF
11.8
78.7
47.2
78.7
23.6
25.6 BSC
51.2 BSC
15.7 REF
ꢀ
0.20
1.9
0.00
1.9
0.40
2.10
1.25
2.10
0.65
7.9
74.8
0.0
74.8
0.0
15.7
82.7
49.2
82.7
25.6
2.00
1.20
2.00
0.60
0.00
0.65 BSC
1.30 BSC
0.40 REF
ꢀ
y
ꢀ
0.08
ꢀ
3.1
Revision History (check upꢀtoꢀdate version)
Data Sheet Version
Remark
Add R1 to VDD pin at testing & application circuit
V02_03
Information provided by StarChips Technology is believed to be accurate and reliable. Application circuits shown, if
any, are typical examples illustrating the operation of the devices. Starchips can not assume responsibility and any
problem raising out of the use of the circuits. Starchips reserves the right to change product specification without
prior notice.
StarChips Technology, Inc.
4F, No.5, Technology Rd.,ScienceꢀBased Industrial Park, HsinꢀChu,Taiwan, R.O.C.
www.starchips.com.tw
Tel: +886ꢀ3ꢀ577ꢀ5767 # 555
Page 13 of 13
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