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PDF MBI1804 Data sheet ( Hoja de datos )
| Número de pieza | MBI1804 | |
| Descripción | All-Ways-On High-Power LED Driver | |
| Fabricantes | Macroblock | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MBI1804 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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Macroblock
Datasheet
MBI1804
All-Ways-OnTM High-Power LED Driver
Features
z 4 constant-current output channels
z Constant output current invariant to load voltage change
z Maximum output constant current per channel: 240mA
z Excellent output current accuracy:
between channels: <±3% (max.), and
between ICs: <±6% (max.)
z Output current adjusted through an external resistor
z Schmitt trigger input
z 5V supply voltage
z Package type: “Pb-free & Green” SOP8 with thermal pad
Small Outline Package
GDGD: :SSOOPP88-1L5-01-15.027-1.27
Current Accuracy
Between Channels
Between ICs
< ±3%
< ±6%
Conditions
IOUT = 40 ~ 240 mA
Product Description
MBI1804 is an instant On/Off LED driver for high power LED applications and exploits PrecisionDrive™ and
All-Ways-On™ technology to enhance its output characteristics. At MBI1804 output stage, four regulated current
ports are designed to provide uniform and constant current sinks for driving LEDs within a large range of VF
variations.
With All-Ways-On™, MBI1804 provides users 4-channel constant current ports. Users may adjust the output
current from 40 mA up to 240mA through an external resistor, Rext, which gives users flexibility in controlling the
light intensity of LEDs. In addition, users can precisely adjust LED brightness from 0% to 100% via output enable
( OE ) with Pulse Width Modulation.
Additionally, to ensure the system reliability, MBI1804 is built with TP (Thermal Protection) function and thermal
pad. The TP function protects IC from over temperature (165°C). Also, the thermal pad enhances the power
dissipation. As a result, a large amount of current can be handled safely in one package.
©Macroblock, Inc. 2009
Floor 6-4, No.18, Pu-Ting Rd., Hsinchu, Taiwan 30077, ROC.
TEL: +886-3-579-0068, FAX: +886-3-579-7534 E-mail: [email protected]
-1-
Jan. 2009, VA.00
1 page  
MBI1804
All-Ways-OnTM High-Power LED Driver
Electrical Characteristics
Characteristic
Supply Voltage
Sustaining Voltage at
OE =High
Output Current
Input Voltage
“H” level
“L” level
Output Leakage Current
Output Current 1
Symbol
VDD
VDS
IOUT
VIH
VIL
IOH
IOUT1
Condition
-
OUT0 ~ OUT3
DC Test Circuit
Ta= -40~85ºC
Ta= -40~85ºC
VDS =17V, OE =High
VDS= 0.6V
Rext=2.4kΩ
Min.
4.5
Typ.
5.0
Max.
5.5
Unit
V
- - 17.0 V
40 - 240* mA
0.7×VDD
-
VDD V
GND
- 0.3×VDD V
- - 0.5 µA
- 122 - mA
Current Skew 1
dIOUT/IOUT
IOL= 122mA
VDS= 0.6V
Rext=2.4kΩ
-
±1 ±3 %
Output Current 2
IOUT2
VDS= 0.8V
Rext=1.3kΩ - 225 - mA
Current Skew 2
dIOUT/IOUT
IOL= 225mA
VDS= 0.8V
Rext=1.3kΩ
-
±1 ±3 %
Regulation of Output
Current vs. Sustaining
Voltage
Regulation of Output
Current vs. Supply Voltage
%/dVDS VDS within 1.0V and 3.0V
%/dVDD VDD within 4.5V and 5.5V
- ±0.1 - % / V
- ±1 - % / V
OE Pull-up Resistor
Threshold Junction
Temperature of Thermal
Shutdown
RIN(up)
Tx
OE
When Tj approaches Tx and
OUT is shut off.
250 500 800 KΩ
- 165 -
°C
IDD(off) 1 Rext=Open, OUT0 ~ OUT3 = Off - 5 9
Supply
Current
“OFF”
IDD(off) 2
IDD(off) 3
Rext=2.4kΩ, OUT0 ~ OUT3 = Off
Rext=1.3kΩ, OUT0 ~ OUT3 = Off
-
-
6 10
8 12 mA
“ON”
IDD(on) 1
IDD(on) 2
Rext=2.4kΩ, OUT0 ~ OUT3 = On
Rext=1.3kΩ, OUT0 ~ OUT3 = On
-
-
6 10
7 10
* Each output current, IOUT, can be driven up to 360mA, but the total output current should be smaller than 1A.
Test Circuit for Electrical Characteristics
IDD
VDD
C1
Function
Generator
Logic input
waveform
VIH
VIL
VDD OUT0
OE
OUT3
R-EXT GND
IR-EXT
Rext
IOUT
VDS
C2
Figure 2
- 5 - Jan. 2009, VA.00
5 Page 
MBI1804
All-Ways-OnTM High-Power LED Driver
Package Power Dissipation (PD)
The maximum power dissipation, PD(max) = (Tj,max – Ta) / Rth(j-a), decreases as the ambient temperature increases.
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
Max. Power Dissipation at Various Ambient Temperature
SOP-8(GD) Type: Rth(j-a)= 125(°C/W)*
Safe Operation Area
25 50 75
Ambient Temperature (°C)
100
Figure 7
The maximum allowable package power dissipation is determined as PD(max) = (Tj,max – Ta) / Rth(j-a). When 4
output channels are turned on simultaneously, the actual package power dissipation is PD(act) = (IDD x VDD) + (IOUT
x Duty x VDS x 4). 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 / 4,
where Tj = 125°C;
Duty= tON / T;
tON: the time of LEDs turning on; T: OE signal period
tON
OE
T
*Note: The empirical thermal resistor Rth(j-a) =125 °C/W is based on the following structure.
Copper foil
L2 L1
W1
W2
The PCB area L2xW2 is 4 times of the
IC’s area L1xW1.
The thickness of the PCB is 1.6mm,
copper foil 1 Oz. The thermal pad on the
IC’s bottom has to be mounted on the
copper foil.
- 11 -
Jan. 2009, VA.00
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MBI1804.PDF ] | |
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