MBI5026CF [ETC]
16-bit Constant Current LED Sink Driver; 16位恒流LED驱动器
| 型号： | MBI5026CF |
| 厂家： | 
ETC |
| 描述： | 16-bit Constant Current LED Sink Driver |
| 文件： | 总17页 (文件大小：375K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MBI5026
Preliminary Datasheet
Macroblock
16-bit Constant Current LED Sink Driver
Features
MBI5026CNS
· 16 constant-current output channels
· Constant output current invariant to load voltage change
· Excellent output current accuracy:
between channels: ±3% (max.), and
between ICs: ±6% (max.)
MBI5026CF
· Output current adjusted through an external resistor
· Constant output current range: 5-90 mA
· Fast response of output current, OE (min.): 200 ns
· 25MHz clock frequency
· Schmitt trigger input
· 5V supply voltage
MBI5026CP
Current Accuracy
Conditions
IOUT = 10 mA ~ 60 mA
Between Channels
Between ICs
< ±3%
< ±6%
Product Description
MBI5026 is designed for LED displays. As an enhancement of its predecessor, MBI5016,
MBI5026 exploits PrecisionDrive™ technology to enhance its output characteristics. MBI5026
contains a serial buffer and data latches which convert serial input data into parallel output
format. At MBI5026 output stage, sixteen regulated current ports are designed to provide
uniform and constant current sinks for driving LEDs within a large range of Vf variations.
MBI5026 provides users with great flexibility and device performance while using MBI5026 in
their system design for LED display applications, e.g. LED panels. Users may adjust the output
current from 5 mA to 90 mA through an external resistor, Rext, which gives users flexibility in
controlling the light intensity of LEDs. MBI5026 guarantees to endure maximum 17V at the
output port. The high clock frequency, 25 MHz, also satisfies the system requirements of high
volume data transmission.
ÓMacroblock, Inc. 2003
Floor 6-4, No.18, Pu-Ting Rd., Hsinchu, Taiwan 30077, ROC.
TEL: +886-3-579-0068, FAX: +886-3-579-7534 E-mail: info@mblock.com.tw
- 1 -
MBI5026
16-bit Constant Current LED Sink Driver
Block Diagram
OUT0 OUT1
OUT14 OUT15
IO Regulator
R-EXT
VDD
16-bit Output Driver
OE
LE
16
16-bit Output Latch
16
GND
16-bit Shift Register
SDO
SDI
CLK
Terminal Description
Pin Configuration
Pin No.
Pin Name
Function
24
23 R-EXT
SDO
21 OE
GND
SDI
CLK
LE
OUT0
OUT1
OUT2
OUT3
OUT4
1
2
3
4
5
6
7
8
9
VDD
Ground terminal for control logic and current
sink
1
GND
22
2
3
SDI
Serial-data input to the shift register
20
19
OUT15
OUT14
Clock input terminal for data shift on rising
edge
CLK
18 OUT13
17 OUT12
OUT11
OUT10
OUT9
16
15
14
13
Data strobe input terminal
OUT5 10
OUT6 11
OUT7
Serial data is transferred to the output latch
when LE is high. The data is latched when
LE goes low.
4
LE
12
OUT8
5~20
21
Constant current output terminals
Output enable terminal
OUT0 ~OUT15
OE
When (active) low, the output drivers are
enabled; when high, all output drivers are
turned OFF (blanked).
Serial-data output to the following SDI of
next driver IC
22
SDO
Input terminal used to connect an external
resistor for setting up output current for all
output channels
23
24
R-EXT
VDD
5V supply voltage terminal
April 2003, V0.8-4
- 2 -
MBI5026
16-bit Constant Current LED Sink Driver
Equivalent Circuits of Inputs and Outputs
LE terminal
terminal
OE
VDD
VDD
IN
IN
CLK, SDI terminal
SDO terminal
VDD
VDD
OUT
IN
April 2003, V0.8-4
- 3 -
MBI5026
16-bit Constant Current LED Sink Driver
Timing Diagram
N = 0
1
2
3
4
5
6
7
8
9
10 11 12
13
14 15
CLK
SDI
LE
OE
OFF
ON
OUT0
OFF
ON
OUT1
OFF
ON
OUT2
OUT3
OFF
ON
OFF
ON
OUT15
SDO
: don’t care
Truth Table
CLK
LE
H
L
SDI
Dn
SDO
Dn-15
Dn-14
Dn-13
Dn-13
Dn-13
OE
L
OUT0 … OUT 7… OUT15
Dn ….. Dn - 7 ….Dn - 15
L
Dn+1
Dn+2
Dn+3
Dn+3
No Change
H
X
L
Dn + 2 ….Dn - 5 ….Dn - 13
L
Dn + 2 ….Dn - 5 ….Dn - 13
X
H
Off
April 2003, V0.8-4
- 4 -
MBI5026
16-bit Constant Current LED Sink Driver
Maximum Ratings
Characteristic
Symbol
VDD
Rating
0~7.0
-0.4~VDD + 0.4
+90
Unit
V
Supply Voltage
Input Voltage
VIN
V
Output Current
Output Voltage
Clock Frequency
GND Terminal Current
IOUT
mA
V
VDS
-0.5~+20.0
25
FCLK
IGND
MHz
mA
1440
CNS – type
CF – type
CP – type
CNS – type
CF – type
CP – type
1.52
Power Dissipation
(On PCB, Ta=25°C)
PD
W
1.30
1.11
82
Thermal Resistance
(On PCB, Ta=25°C)
Rth(j-a)
°C/W
96
112
Operating Temperature
Storage Temperature
Topr
Tstg
-40~+85
-55~+150
°C
°C
April 2003, V0.8-4
- 5 -
MBI5026
16-bit Constant Current LED Sink Driver
Recommended Operating Conditions
Characteristic
Supply Voltage
Output Voltage
Symbol
VDD
VDS
IOUT
IOH
Condition
Min.
Typ.
Max.
5.5
Unit
V
-
4.5
5.0
-
-
-
-
-
-
-
-
17.0
60
V
OUT0 ~ OUT15
DC Test Circuit
5
mA
mA
mA
V
Output Current
Input Voltage
SDO
SDO
-
-
-1.0
IOL
1.0
VIH
0.8VDD
-0.3
40
VDD+0.3
0.3VDD
-
CLK, OE , LE and SDI
CLK, OE , LE and SDI
VIL
V
tw(L)
ns
LE Pulse Width
CLK Pulse Width
tw(CLK)
tw(OE)
tsu(D)
th(D)
tsu(L)
th(L)
20
-
-
-
-
ns
ns
200
OE Pulse Width
Setup Time for SDI
Hold Time for SDI
Setup Time for LE
Hold Time for LE
Clock Frequency
VDD=4.5~5.5V
5
10
15
15
-
-
-
-
-
-
-
-
-
-
-
ns
ns
-
ns
-
ns
FCLK
Cascade Operation
Ta=85°C (CNS type)
Ta=85°C (CF type)
Ta=85°C (CP type)
25.0
0.79
0.67
0.57
MHz
-
Power Dissipation
PD
W
-
-
April 2003, V0.8-4
- 6 -
MBI5026
16-bit Constant Current LED Sink Driver
Electrical Characteristics
Characteristic
Symbol
Condition
Min.
Typ.
Max.
Unit
“H” level
“L” level
VIH
VIL
Ta = -40~85ºC
Ta = -40~85ºC
0.8VDD
GND
-
-
VDD
V
V
Input Voltage
0.3VDD
Output Leakage Current
IOH
VOH=17.0V
-
-
0.5
μA
VOL
VOH
IOL=+1.0mA
IOH=-1.0mA
-
-
-
0.4
-
V
V
SDO
Output Voltage
4.6
IOUT1
dIOUT1
IOUT2
VDS=0.6V
Rext=720 Ω
Rext=720 Ω
Rext=360 Ω
Rext=360 Ω
-
-
-
-
25.0
±1
-
mA
%
Output Current 1
IOL=25mA
VDS=0.6V
±3
-
Current Skew
VDS=0.8V
50.0
±1
mA
%
Output Current 2
Current Skew
IOL=50mA
VDS=0.8V
dIOUT2
±3
Output Current vs.
Output Voltage Regulation
%/dVDS
%/dVDD
VDS within 1.0V and 3.0V
VDD within 4.5V and 5.5V
-
-
±0.1
±1
-
-
% / V
% / V
Output Current vs.
Supply Voltage Regulation
Pull-up Resistor
RIN(up)
RIN(down)
IDD(off) 1
IDD(off) 2
IDD(off) 3
IDD(on) 1
IDD(on) 2
250
500
500
9
800
KΩ
KΩ
OE
Pull-down Resistor
250
800
LE
-
-
-
-
-
-
-
-
-
-
Rext=Open, OUT0 ~OUT15 =Off
Rext=720 Ω, OUT0 ~ OUT15 =Off
Rext=360 Ω, OUT0 ~ OUT15 =Off
10
11
10
11
“OFF”
Supply
Current
mA
Rext=720 Ω, OUT0 ~ OUT15 =On
Rext=360 Ω, OUT0 ~ OUT15 =On
“ON”
Test Circuit for Electrical Characteristics
IDD
IOUT
VDD
OUT0
OE
.
.
.
.
IIH,IIL
CLK
LE
OUT15
SDI
SDO
GND
R -EXT
VIH, VIL
Iref
April 2003, V0.8-4
- 7 -
MBI5026
16-bit Constant Current LED Sink Driver
Switching Characteristics
Characteristic
Symbol
Condition
Min.
Typ.
Max.
Unit
-
-
50
50
100
100
100
-
ns
ns
ns
ns
ns
ns
ns
tpLH1
tpLH2
tpLH3
tpLH
CLK - OUTn
LE - OUTn
Propagation Delay Time
(“L” to “H”)
-
20
OE - OUTn
CLK - SDO
15
-
20
VDD=5.0 V
VDS=0.8 V
VIH=VDD
VIL=GND
Rext=300 Ω
VL=4.0 V
RL=52 Ω
CL=10 pF
100
100
50
150
150
150
tpHL1
tpHL2
tpHL3
CLK - OUTn
LE - OUTn
-
Propagation Delay Time
(“H” to “L”)
-
OE - OUTn
CLK - SDO
15
20
20
200
5
20
-
-
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tpHL
tw(CLK)
tw(L)
CLK
LE
-
-
-
Pulse Width
-
-
tw(OE)
OE
Hold Time for LE
-
-
t
h(L)
Setup Time for LE
Maximum CLK Rise Time
Maximum CLK Fall Time
Output Rise Time of Iout
Output Fall Time of Iout
5
-
-
t
su(L)
-
-
500
500
200
120
tr**
-
-
tf**
tor
-
70
40
-
tof
※If the devices are connected in cascade and t or t is large, it may be critical to achieve the timing required for
r
f
data transfer between two cascaded devices.
Test Circuit for Switching Characteristics
IDD
IOUT
VDD
VIH, VIL
OUT0
OE
.
.
CLK
Function
.
Generator
LE
OUT15
RL
CL
SDI
SDO
GND
R -EXT
Logic input
waveform
VL
VIH = 5V
VIL = 0V
CL
Iref
tr = tf =10 ns
April 2003, V0.8-4
- 8 -
MBI5026
16-bit Constant Current LED Sink Driver
Timing Waveform
tW(CLK)
50%
50%
50%
CLK
SDI
tsu(D)
th(D)
50%
50%
50%
SDO
LE
tW(L)
tpLH, tpHL
50%
50%
th(L)
tsu(L)
LOW = OUTPUTS ENABLED
OE
HIGH = OUTPUT OFF
LOW = OUTPUT ON
50%
OUTn
tpLH1, tpHL1
tpLH2, tpHL2
tW(OE)
50%
OE
50%
tpLH3
tpHL3
90%
50%
10%
90%
50%
10%
OUTn
tor
tof
April 2003, V0.8-4
- 9 -
MBI5026
16-bit Constant Current LED Sink Driver
Application Information
Constant Current
To design LED displays, MBI5026 provides nearly no variations in current from channel to
channel and from IC to IC. This can be achieved by:
1) The maximum current variation between channels is less than ±3%, and that between ICs is
less than ±6%.
2) In addition, the current characteristic of output stage is flat and users can refer to the figure
as shown below. The output current can be kept constant regardless of the variations of LED
forward voltages (Vf). This performs as a perfection of load regulation.
100.00
90.00
80.00
70.00
60.00
50.00
40.00
30.00
20.00
10.00
0.00
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
1
1.1 1.2 1.3 1.4 1.5
2
2.5
VDS (V)
April 2003, V0.8-4
- 10 -
MBI5026
16-bit Constant Current LED Sink Driver
Adjusting Output Current
The output current of each channel (IOUT) is set by an external resistor, Rext. The relationship
between Iout and Rext is shown in the following figure.
IOUT (mA)
100
90
80
70
VDS = 1.0V
60
50
40
30
20
10
0
0
500
1000
1500
2000
2500
3000
3500
4000
Resistance of the external resistor, Rext, in Ω
Also, the output current in milliamps can be calculated from the equation:
IOUT is (625 / Rext) x 28.8, approximately,
where Rext, in Ω, is the resistance of the external resistor connected to R-EXT terminal.
The magnitude of current (as a function of Rext) is around 50mA at 360Ω and 25mA at 720Ω.
April 2003, V0.8-4
- 11 -
MBI5026
16-bit Constant Current LED Sink Driver
Package Power Dissipation (PD)
The maximum allowable package power dissipation is determined as PD(max) = (Tj – Ta) / Rth(j-a)
.
When 16 output channels are turned on simultaneously, the actual package power dissipation is
PD(act) = (IDD x VDD) + (IOUT x Duty x VDS x 16). Therefore, to keep PD(act) ≤ PD(max), the
allowable maximum output current as a function of duty cycle is:
IOUT = { [ (Tj – Ta) / Rth(j-a) ] – (IDD x VDD) } / VDS / Duty / 16,
where Tj = 150°C.
(A) Iout = 90mA, VDS = 1.0V, 16 output channels active
For CNS type package, the thermal resistance is Rth(j-a) = 82 (°C/W)
Iout vs. Duty Cycle at Rth = 82 (°C/W)
100
90
80
70
60
50
40
Ta = 25°C
Ta = 55°C
30
20
10
0
Ta = 85°C
Duty Cycle
For CF type package, the thermal resistance is Rth(j-a) = 96 (°C/W)
Iout vs. Duty Cycle at Rth = 96 (°C/W)
100
90
80
70
60
50
Ta = 25 ℃
40
30
Ta = 55 ℃
20
10
Ta = 85 ℃
0
Duty Cycle
April 2003, V0.8-4
- 12 -
MBI5026
16-bit Constant Current LED Sink Driver
For CP type package, the thermal resistance is Rth(j-a) = 112 (°C/W)
Iout vs. Duty Cycle at Rth = 112 (°C/W)
100
90
80
70
60
50
Ta = 25°C
40
30
Ta = 55°C
20
10
Ta = 85°C
0
Duty Cycle
(B) Iout = 60mA, VDS = 0.8V, 16 output channels active
For CNS type package, the thermal resistance is Rth(j-a) = 82 (°C/W)
Iout vs. Duty Cycle at Rth = 82 (°C/W)
70
60
50
40
Ta = 25°C
30
Ta = 55°C
20
10
Ta = 85°C
0
Duty Cycle
April 2003, V0.8-4
- 13 -
MBI5026
16-bit Constant Current LED Sink Driver
For CF type package, the thermal resistance is Rth(j-a) = 96 (°C/W)
Iout vs. Duty Cycle at Rth = 96 (°C/W)
70
60
50
40
30
20
10
0
Ta = 25°C
Ta = 55°C
Ta = 85°C
Duty Cycle
For CP type package, the thermal resistance is Rth(j-a) = 112 (°C/W)
Iout vs. Duty Cycle at Rth = 112 (°C/W)
70
60
50
40
Ta = 25°C
30
Ta = 55°C
20
10
0
Ta = 85°C
Duty Cycle
April 2003, V0.8-4
- 14 -
MBI5026
16-bit Constant Current LED Sink Driver
The maximum power dissipation, PD(max) = (Tj – Ta) / Rth(j-a), decreases as the ambient
temperature increases.
Max. Power Dissipation at Various Ambient Temperature
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
CNS Type: Rth = 82
CF Type: Rth = 96
CP Type: Rth = 112
-40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
Ambient Temperature
Load Supply Voltage (VLED
)
MBI5026 are designed to operate with VDS ranging from 0.4V to 1.0V considering the package
power dissipating limits. VDS may be higher enough to make PD(act) > PD(max) when VLED = 5V
and VDS = VLED – Vf, in which VLED is the load supply voltage. In this case, it is recommended to
use the lowest possible supply voltage or to set an external voltage reducer, VDROP
A voltage reducer lets VDS = (VLED – Vf) – VDROP
Resistors or Zener diode can be used in the applications as shown in the following figures.
.
.
VLED
VLED
VDROP
VDROP
Vf
Vf
VDS
VDS
MBI5026
MBI5026
April 2003, V0.8-4
- 15 -
MBI5026
16-bit Constant Current LED Sink Driver
Package Outlines
MBI5026CNS Outline Drawing
SDIP-24-P-300-1.78
Units: mm
Weight: 1.11g (typ)
MBI5026CF Outline Drawing
SOP-24-P-300-1.00
Units: mm
Weight: 0.28g (typ)
April 2003, V0.8-4
- 16 -
MBI5026
16-bit Constant Current LED Sink Driver
MBI5026CP Outline Drawing
SSOP24-P-150-0.64
Units: mm
Weight: 0.11g (typ)
April 2003, V0.8-4
- 17 -
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