BD83732HFP-M_16 Datasheet, PDF (7/33 Pages) Rohm – 1ch Source Driver for Automotive

BD83732HFP-M / BD83733HFP-M
Functional Description
(Unless otherwise specified, Ta=25°C, VIN=13V, IOUT=6V and RVIN_F=0.47Ω. Numbers are "Typical" values.)
1. Output Current Setting
LED Current IOUT can be set by value of resistor RVIN_F.
IOUT  ^{(VIN VIN_F)}  ^VIN_F_REF [A]
RVIN_F
RVIN_F
where:
VIN_F_REF is 0.18V (Typ)
PWM_in
RVIN_F
VIN_F
VIN
IOUT
I_OUT
CIOUT
VREF
+B
VIN-0.180V
(Typ)
GND
Figure 13. Output Current Setting
2. Table of Operations
The PWM dimming mode switches to linear control depending on CRT terminal voltage.
When VCRT > VCRT_DIS2( Typ ~ 4.0V ), Dimming mode turns to Linear Control, and discharge resistance of DISC
terminal changes from RD1( Typ ~ 50 Ω ) to RD2 ( Typ ~ 5k Ω ).
When an LED open/short-circuit fault is detected, which depends on IOUT terminal voltage, the output current is turned
OFF.
Output current is also turned OFF when PBUS terminal is pulled LOW.
Operation Mode
Linear Control
CRT Terminal
4.0V(Typ)≤VCRT
IOUT Terminal
Voltage
(VIOUT)
-
Output Current
(IOUT)
50mA～500mA
PBUS
Terminal
Hi-Z
See Features
PWM dimming
Functional Description,
3. PWM Dimming
-
Operation
See Features
Functional Description,
3. PWM Dimming
Hi-Z
Operation
LED Current
De-rating
LED Open
See Features Description,
-
-
8. LED Current De-rating
PBUS<2.5V
Function
-
VIOUT ≥
1μA(Max)
Low Output
VIN - .050V(Typ)
LED Short
-
VIOUT ≤ 0.6V(Typ)
40μA(Max)
Low Output
PBUS Control OFF
-
-
1μA(Max)
Low Input
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TSZ02201-0G1G0C700310-1-2
2016.Aug.25 Rev.003