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PDF MBI1838 Data sheet ( Hoja de datos )
| Número de pieza | MBI1838 | |
| Descripción | 8-Channel All-Ways-On Constant Current LED Driver | |
| Fabricantes | Macroblock | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MBI1838 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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Macroblock
Preliminary Datasheet
MBI1838
8-Channel All-Ways-OnTM Constant Current LED Driver
Features
z Maximum 70V sustaining voltage
z 8 constant current output channels
z Adjustable 15~80mA 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.)
between chips: <±6% (max.)
z Integrated voltage regulator for 8~40V supply voltage
z Dimming control: 1:100@5KHz
z LED open-/short-circuit detection function and error flag ( ERR )
z Over voltage detection
z Thermal shutdown and thermal flag ( TH )
z Serial and parallel voltage feedback for DC/DC converter
z RoHS compliant packages with thermal pad
Thin Shrink SOP
GTS: TSSOP24L-173-0.65
Current Accuracy
Between Channels
Between ICs
< ±3%
< ±6%
Conditions
IOUT = 15 ~ 80mA
©Macroblock, Inc. 2010
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 - June 2010, V1.00
1 page  
MBI1838
8-Channel All-Ways-OnTM Constant Current LED Driver
Pin Description
Pin No.
GTS
24
1
22
23
2
3
4
5
8-11
14-17
20
21
-
6,7,12,13,18,19
Pin Name
Function
VDD
GND*
TH
EN
R-EXT
FBI
FBO
OVP
8V~40V supply voltage terminal
Ground terminal for control logic and current sink
Open drain thermal flag
When junction temperature is over 145ºC, TH is going to low.
Chip enable/disable terminal.
When EN is active (high), the chip is enabled; when EN is inactive (low),
the chip is turned off (blanked).
The terminal used to connect an external resistor for setting up output
current for output channel
Feedback control voltage input from another MBI1838.
Connected to FBO of the previous MBI1838 in the serial feedback method.
If the MBI1838 is the 1st one of the series, connect this pin to R-EXT.
Feedback control voltage to DC/DC converter.
The relationship between FBO, FBI, and minimum output voltage is
VFBO=minimum output voltage(FBI, VDS, min)
Connect this pin to the FBI of the next MBI1838. If the MBI1838 is the last
one of the series, connect this pin to the feedback input of DC-DC
converter.
Over voltage protection input
Connect this pin with appropriate voltage divider resistors to VLED to set
OVP detection criterion, VOVP, which compares with the internal voltage,
1.25V. If VOVP exceeds 1.25V, the fault condition, open-circuit will be
determined.
OUT0 ~ OUT7 Constant current output terminals
OE
ERR
Thermal Pad
NC
Output enable terminal
When OE is active (high), the output pins are enabled; when OE is inactive
(low), the output pins are turned off (blanked).
Open drain error flag
When any single output channel is determined as open-circuit or
short-circuit, ERR is going to low.
Power dissipation terminal*
No connection
*The desired thermal conductivity will be improved on condition that a heat-conducting copper foil on PCB is
soldered with thermal pad.
- 5 - June 2010, V1.00
5 Page 
MBI1838
8-Channel All-Ways-OnTM Constant Current LED Driver
Timing Waveform
A. Propagation Delay Time
tw(OE)
OE 50%
50%
OUTn
50%
50%
Fig. 5
tpLH
B. FBO Delay Time
tpHL
90%
90%
10% 10%
tof tor
VDS
50%
50%
FB
50%
50%
tFB tFB
Fig. 6
C. Short-Circuit Detection
EN
OVPS
OE
VDS
ERR
Fig. 7
5.6V
(VSD,TH)
tSLP
- 11 -
June 2010, V1.00
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet MBI1838.PDF ] | |
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