BD183x7EFV Advantage | Energy Sharing
Function with External Resistors
Rather than dissipating all of the LED power in the driver IC, as competitor devices do,
ROHM's new products include a pin that allows the power to be dissipated in the external
thermal resistors. So, instead of requiring two driver ICs to reduce the power dissipated in
each, these external power resistors reduce the design's size and cost
ROHM Company A Company B
Total BOM
0 pcs compared to Company A
-7 pcs compared to Company B
Total Area
-30.1% compared to Company A
-50.0% compared to Company B
image of the area size
Figure 4: Example of BOM and Board Space Savings with BD183x7EFV
The PBUS function reduces the need for additional control circuitry by integrating
the control function between multiple driver ICs to turn off all LEDs when an open
or short is detected on any LED channel. This function is currently required in
automobiles in the European Union, and it can be accomplished without additional
components when using a BD183x7EFV driver IC.
VINRES
VIN
CRT
GND
OUT1
OUT2
OUT3
OUT4
SET1
SET2
SET3
SET4
DISC
MSET1
MSET2
PBUS
VINRES
VIN
CRT
GND
OUT1
OUT2
OUT3
OUT4
SET1
SET2
SET3
SET4
DISC
MSET1
MSET2
PBUS
VINRES
VIN
CRT
GND
OUT1
OUT2
OUT3
OUT4
SET1
SET2
SET3
SET4
DISC
MSET1
MSET2
PBUS
BD18337EFV-M
BD18347EFV-M
U1
BD18337EFV-M
BD18347EFV-M
U1
BD18337EFV-M
BD18347EFV-M
U1
LED ON LED OFF LED OFF
1 OUT all OUT when IC detect LED open/short
Figure 5: PBUS Function
BD183x7EFV Advantage | PBUS Function
7
