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PDF MBI1828 Data sheet ( Hoja de datos )
| Número de pieza | MBI1828 | |
| Descripción | 8-Channel All-Ways-On Constant Current LED Driver | |
| Fabricantes | Macroblock | |
| Logotipo |  |
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Macroblock
Preliminary Datasheet
MBI1828
8-Channel All-Ways-OnTM Constant Current LED Driver
Features
z Maximum 50V output sustaining voltage
z 8 constant-current output channels
z Adjustable 5 - 60mA output current per channel through an external resistor
z Constant output current invariant to load voltage change
z Excellent output current accuracy:
between channels: <±3% (max.), and
between ICs: <±6% (max.)
z Open-circuit detection mode to detect LED errors
z Integrated voltage regulator for 8 - 40V supply voltage
z Voltage feedback for DC/DC controller
z Package Type: “Pb-free & Green” package with thermal pad
Current Accuracy
Between Channels
Between ICs
< ±3%
< ±6%
Conditions
IOUT = 5 ~ 60mA
Thin Shrink SOP
GTS: TSSOP16-173-0.65
Quad Flat No-Lead
GFN: QFN24-4*4-0.5
Product Description
MBI1828 is an instant On/Off LED driver for lighting applications and exploits PrecisionDrive™ technology to
enhance its output characteristics. At MBI1828 output stage, 8 regulated current ports are designed to provide
uniform and constant current sinks for driving LEDs within a large range of VF variations.
MBI1828 provides users 8-channel constant current ports to match LEDs with equal current. Users may adjust the
output current from 5mA to 60mA 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, MBI1828 is built with thermal pad which enhances the heat dissipation.
Applications
z Automotive lighting
z Channel letter
z Decorative LED lighting
z LCD monitor
©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 - September. 2009, V 1.01
1 page  
MBI1828
8-Channel All-Ways-OnTM Constant-Current LED Driver
Electrical Characteristics
VDD=12V, GND =0V, Ta=25°C, unless otherwise specified.
Characteristic
Symbol
Condition
Supply Voltage
VDD
-
Input Voltage of “High” level
OE “Low” level
VOE,IH
V OE,IL
Ta= -40~85ºC
Ta= -40~85ºC
Output Voltage of ERR
V ERR ,OH
V ERR ,OL
IERR,OH = 1.0mA
IERR,OL= 1.0mA
Output Voltage of TH
V TH ,OH
V TH ,OL
ITH ,OH =1.0mA
ITH ,OL= 1.0mA
VOUT Feedback Report Voltage
VFB
VOUT(min)=0.8V
Supply
Current
OE=Low
OE=High
Standby Current
Output Current
IDD(off) 1 Rext= Open, OUT0 ~ OUT7 = Off
IDD(off) 2 Rext= 2.4kΩ, OUT0 ~ OUT7 = Off
IDD(off) 3 Rext= 1.3kΩ, OUT0 ~ OUT7 = Off
IDD(on) 1 Rext= 2.4kΩ, OUT0 ~ OUT7 = On
IDD(on) 2 Rext= 1.3kΩ, OUT0 ~ OUT7 = On
IDD(std) OE= low, OE waits for 825us
IOUT
Test Circuit for Electrical
Characteristics
Output Leakage Current
IOH VDS= 40.0V, OE=Low
Output Current 1
IOUT1
VDS= 0.6V, Rext= 2.4kΩ
Min.
8
2.8
GND
4.2
-
4.2
-
-
-
-
-
2.5
3.0
-
5
-
-
Current Skew 1
dIOUT1
IOUT1= 30.75mA, VDS= 0.6V,
Rext= 2.4kΩ
-
Output Current 2
IOUT2
VDS= 0.8V, Rext= 1.3kΩ
-
Current Skew 2
dIOUT2
IOUT2= 56.7mA, VDS= 0.8V
Rext= 1.3kΩ
Current Chip Skew
Output Current vs.
Output Voltage Regulation
Output Current vs.
Supply Voltage Regulation
%/dVDS
%/dVDD
VDS = 0.6V, IOL = 24.6mA,
Rext= 3kΩ
VDS within 1.0V and 3.0V
VDD within 8.0V and 40V
Pull-down Resistor of OE
ROE-IN
Junction Temperature
Threshold of Thermal flag
Tx
The Hysteresis Temperature of
Thermal Flag
Thys
*Each output current, IOUT, can be driven up to 60mA.
-
-
-
-
-
-
280
-
-
Typ.
-
-
-
-
-
-
-
1.25
0.57
Max.
40
VDD
0.7
5
0.5
5
0.5
-
2.5
0.57 3.5
0.57 4
3.17 5
3.55
0.57
5
1
- 60*
-
30.75
0.5
-
±1 ±3
56.7 -
±1 ±3
- ±6
±0.1 ±0.5
±0.1 ±0.5
400 520
155 -
35 -
Unit
V
V
V
V
V
V
V
V
mA
mA
mA
µA
mA
%
mA
%
%
%/V
%/V
KΩ
C
C
- 5 - September. 2009, V1.01
5 Page 
MBI1828
8-Channel All-Ways-OnTM Constant-Current LED Driver
Principle to Cooperate with DC/DC Converter (Boost converter)
MBI1828 can co-work with DC/DC converter through FB terminal. The voltage of FB terminal is VFB=1.56 x (VDS, min)
to make VDS reaching 0.8V. When the minimum VDS of MBI1828 in any single channel is lower than 0.8V, the VFB
will force DC/DC controller to boost VLED as shown in Figure 12.
VLED
L1 D1
VIN
LED LED LED LED LED LED LED LED
Figure 12
VCC DC/DC GD
Controller
GND
FB
Q1 C1
R1
R2
LED LED LED LED LED LED LED LED
R3 VDS
OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7
VDD
D2 C2
MBI1828GTS
FB
GND
The Scheme of FB Terminal
When OE is disabled, the FB becomes high impedance (also known as floating). When OE is enabled, the
minimum voltage selector will ignore to connect CHD and open-circuit output channels. The rest of output channels
will select the minimum voltage (Vmin) through the selector and increase to 1.56 times of Vmin as the voltage of FB.
The maximum voltage of FB terminal is 2.3V as shown in Figure 14. The output status of FB (VFB, MBI1828) will be
determined by IOUTn, max, the FB voltage of DC/DC converter (VFB, DC/DC), and ERR status shown in Table 1:
VOUT(min)
FB
Figure 13. The relationship between VFB and VDS of MBI1828
OE
Disable
IOUTn, max>0.9IREF
Don’t care
Enable
FALSE
Enable
TRUE
Enable
TRUE
Enable
TRUE
Table1. True Table of VFB, MBI1828
ERR is High
Don’t care
Don’t care
FALSE
FALSE
TRUE
VFB, DC/DC>1.19V
Don’t care
Don’t care
FALSE
TRUE
TRUE
VFB, MBI1828
High Impedance
High Impedance
High Impedance
1.56 x Vmin
1.56 x Vmin
- 11 -
September. 2009, V1.01
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet MBI1828.PDF ] | |
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