BD83732HFP-M_16 Datasheet, PDF (15/33 Pages) Rohm – 1ch Source Driver for Automotive

BD83732HFP-M / BD83733HFP-M
6. PBUS Function
The PBUS terminal is an input/output terminal for outputting trouble and inputting trouble detection.
When an LED open/short-circuit occurs, the PBUS terminal output is pulled LOW ^(Note1).
It is possible to turn output current OFF by pulling the PBUS terminal Low.
(Note1) PBUS terminal is an open drain terminal. It should always be pulled up(10kΩ) to power supply voltage.
When multiple ICs are used to drive multiple LEDs, as shown in the drawing below, it is possible to turn off all rows of LEDs
if only some LEDs are short/open-circuited by connecting PBUS terminal of each IC.
VIN_F
CRT
VIN
IOUT
CH1
PBUS
LED
OPEN
+B
PBUS
Hi-Z ⇒Low
OPEN
異^T常^ro発^ub生^le
Occurs
VIN_F
CRT
VIN
IOUT
CH2
PBUS
LED
OFF
VIN_F
CRT
VIN
IOUT
CH3
PBUS
LED
OFF
PROTECT　BUS
Conne^各c^Ct^HのP^PB^BU^USS^を接o^続f ^すea^るch CH
Figure 24. PBUS Function
▼Example of Protective Operation due to LED Open Circuit
LLEEDDオOーpプeンn
Poss一i括blしeてtLoEDtuOFrFn制O御FがF可能all LEDs
CH1
CH2
CH3
Connect PBUS of each CH
V_IOUT
I_OUT
V_PBUS
Hi-Z
Low
V_IOUT
VIN
VIOUT_OPEN
Output voltage is brought up
①_wL_hE_eD_nオ_Lー_EDプン_Oに_peな_nる_oこ_ccと_urで_s.
出力電圧が持ち上がる
GND
IOUT
②LLEDD電c流urがreOnFtFtすurるns OFF.
OFF
Hi-z
Low
COlFaFm時pはt1o.41V.に4V
クdラuンrinプgすOるFF
GND
 P_③B_PU_BS_USo_がu_Ltp_ou_wt_出b_力ec_とo_なm_るe Low.
 T④u他rnCsHOのFLFEDL電ED流をcuOrFreFnすtるof
other IC.
I_OUT
V_IOUT
IOUT
OFF _{COlFaFm時pはt1o.41V.に4V}
ク^dラ^uン^rinプ^gす^Oる^FF
GND
I_OUT
IOUT
OFF
Figure 25. Example of Protective Operation
If LED OPEN occurs, PBUS of CH1 is switched from Hi-Z to Low output. As PBUS becomes Low, LED drivers of
other CH detect the condition and turns OFF their own LEDs. VIOUT clamps to 1.4V (Typ) during the OFF period, in
order to prohibit ground fault detection.
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TSZ22111・15・001
15/29
TSZ02201-0G1G0C700310-1-2
2016.Aug.25 Rev.003