BD8381EFV-E2 Rohm Semiconductor, BD8381EFV-E2 Datasheet - Page 5

• Manufacturer Part Number: BD8381EFV-E2
• Description: LED Drivers AUTOMOTIVE GRADE LED DRIVER
• Manufacturer: Rohm Semiconductor

Specifications of BD8381EFV-E2

• Operating Supply Voltage: 5 V to 30 V
• Maximum Supply Current: 7 mA
• Maximum Power Dissipation: 1.45 W
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: HTSSOP-28
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

● 5V voltage reference (VREG)
●About the method of setting the output current
●About Dirating of the LED current that uses THM
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BD8381EFV-M
www.rohm.com
5V (Typ.) is generated from the VCC input voltage when the enable pin is set high. This voltage is used to power internal
circuitry, as well as the voltage source for device pins that need to be fixed to a logical HIGH.
UVLO protection is integrated into the VREG pin. The voltage regulation circuitry operates uninterrupted for output voltages
higher than 4.5 V (Typ.), but if output voltage drops to 4.3 V (Typ.) or lower, UVLO engages and turns the IC off.
Connect a capacitor (Creg = 10uF Typ.) to the VREG terminal for phase compensation. Operation may become unstable if
Creg is not connected.
ILED=min[THM / 5 V , 0.2V] / RISET [A]
As for min[THM / 5 V, 0.2V], small one is selected from among THM and VFB=0.2V.
Please input within the range of 0.05-0.2V when controlling the output current with THM. Please connect with VREG when
not using THM. There is a possibility that the LED GND short detection malfunctions when THM≦50mV.
As for PWM brightness, the control by the PWM signal from the outside and brightness with the CR timer are possible.
It is an ability to set the Dirating curve of the LED current to the temperature as one of the functions to use THM. As for LED,
because deterioration at the high temperature is fast, the maximum allowance LED currents and the curve of temperatures is
given to the data sheet of LED. The voltage with a negative temperature characteristic in THM the Thermistor resistance is
used is input, and the LED current is controlled when the LED current is controlled according to the temperature characteristic.
Moreover, external Tr is used, and two input composition is also possible.
Fig. 12
VTH
OUTL
ILED
5/20
FPWM=
TON_PWM=
Rcr1
Rcr2
Ccr
(R
CR
100000
1+2R
(R
20
10
1.44
CR
CR
R
1+2R
2)C
CR
kohm
kohm
pF
CR
2
CR
2)
2010.10 - Rev.0.11
×100
Technical Note