BD8372EFJ-M ROHM [Rohm], BD8372EFJ-M Datasheet - Page 12

• Manufacturer Part Number: BD8372EFJ-M
• Description: LED Drivers for Automotive Light
• Manufacturer: ROHM [Rohm]

●PROTECT BUS (PBUS)
BD8372HFP-M,BD8372EFJ-M
© 2011 ROHM Co., Ltd. All rights reserved.
www.rohm.com
+B
PUBS is an I/O terminal that outputs error and the terminal that detects error. When error occurs because of open/short of
external parts etc. , Low is output from Hi(Hi-Z) with PBUS terminal, and it is possible to detect error from the outside. The
output current can be turned off by controlling. PUBS to Hi→Low from outside. LED of all rows can control turning off even if
open/short circuit of LED occurs because it connects the terminal PUBS of each CH as shown in following figure when
driving two or mode LED by useing two or mode this IC.
・Example of operating protection by LED open
PBUS becomes LOW from Hi-Z because of the LED open. Turning off the LED driver of another CH detects error and LED is
controlled by PUBS becomes Low. VIOUT clamps to 1.4V and prevents GND short detection in the matrix at turning off.
CH1
CH2
CH3
VIOUT
VIOUT
VIOUT
IIOUT
PBUS
PBUS=Hi-Z ⇒ LOW
IIOUT
IIOUT
PBUS
STOP
VIN
0
0
0
0
0
0
Hi-Z
IOUT
LED Open
OPEN
LOW
LED
PROTECT BUS
Hi-Z
VIN
STOP
PBUS
12/16
clamps to 1.4V
IOUT
LED
OFF
VIOUT-OPEN
VIOUT_SHORT
VIOUT_SHORT
STOP
VIN
PBUS
IOUT
Technical Note
2011.04 - Rev.A
LED
OFF