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BD8381EFV-M 데이터시트 PDF




ROHM Semiconductor에서 제조한 전자 부품 BD8381EFV-M은 전자 산업 및 응용 분야에서
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기능 LED Drivers
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BD8381EFV-M 데이터시트, 핀배열, 회로
Power Management ICs for Automotive Body Control
LED Drivers
for Automotive Light
BD8381EFV-M
No.11039ECT14
Description
BD8381EFV-M is a white LED driver with the capability of withstanding high input voltage (50V MAX).
A current-mode buck-boost DC/DC controller is also integrated to achieve stable operation against voltage input and also to
remove the constraint of the number of LEDs in series connection.
The brightness can be controlled by either PWM or linear. The PWM brightness signal generation circuit is built into, and
the control without microcomputer is also possible.
Features
1) Input voltage range 5.0 – 30 V
2) Integrated buck-boost current-mode DC/DC controller
3) Built-in CR timer for PWM brightness
4) PWM linear brightness
5) Built-in protection functions (UVLO, OVP, TSD, OCP, SCP)
6) LED error status detection function (OPEN/ SHORT)
7) HTSSOP-B28 package
Applications
Headlight and running (DRL) of night of daylight, etc.
Absolute maximum ratings (Ta=25)
Parameter
Symbol
Ratings
Unit
Power supply voltage
VCC
50
BOOT Voltage
VBOOT
55
SW,CS,OUTH Voltage
VSW, VCS, VOUTH
50
BOOT-SW Voltage
VBOOT-SW
7
VREG,OVP,OUTL,FAIL1,FAIL2,THM,SS,
COMP,RT,SYNC,EN,DISC,VTH,FB,LEDR,
LEDC,DRLIN, PWMOUT,CT Voltage
Power Consumption
VVREG,VOVP,VOUTL,VFAIL1,VFAIL2,VTHM,VSS,
VCOMP,VRT,VSYNCVEN,VDISC,VVTH,VFB,VLEDR,
VLEDC, ,VDRLIN,VPWMOUT VCT
Pd
-0.37 < VCC
1.451
Operating temperature range
Topr -40+125
Storage temperature range
Tstg -55+150
Junction temperature
Tjmax
150
1 IC mounted on glass epoxy board measuring 70mm×70mm×1.6mm, power dissipated at a rate of 11.6mW/at temperatures above 25.
2 A radiation is not designed.
V
V
V
V
V
W
Operating conditions (Ta=25)
Parameter
Symbol
Ratings
Power supply voltage
VCC 5.030
Oscillating frequency range
External synchronization frequency range 3 4
FOSC
FSYNC
200600
fosc600
External synchronization pulse duty range
FSDUTY
4060
3 Connect SYNC to GND or OPEN when not using external frequency synchronization.
4 Do not switch between internal and external synchronization when an external synchronization signal is input to the device.
Unit
V
kHz
kHz
%
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
1/23
2012.06 - Rev.C




BD8381EFV-M pdf, 반도체, 판매, 대치품
BD8381EFV-M
70
65 VCC=12V
60
55
50
45
40
35
30
-50
-25 0 25 50 75 100
TEMPERATURE:Ta []
125
Fig.13 LED open detection voltage
Temperature characteristic
400
VCC=12V
LEDR=2V
350
300
250
200
150
100
-50
-25 0 25 50 75 100
TEMPERATURE:Ta []
125
Fig.14 LED Short detection
Threshold voltage
Technical Note
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
4/23
2012.06 - Rev.C

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BD8381EFV-M 전자부품, 판매, 대치품
BD8381EFV-M
Technical Note
About time from EN turning on to PWM turning on and the start from PWM low Duty
The GND short protection detecting function (hereafter,
SCP) starts with EN=LowHi, and after the time of the
SCP timer detection starts
timer set with the external capacitor connected with CT, it
becomes latch off. (Above figure and )
EN
The charge with SS begins synchronizing with turning on
Time of SCP timer
EN. The PWM latch off function is built into when there is
not PWM turning on, and when the PWM latch off is
Time until turning on PWM
detected, (of SS and the SCP counter) is reset. (The PWM
time of the timer at latch OFF is calculated by oscillatory
frequency ×32770 counts of DC/DC. ) Therefore, the
following relations exist at time until PWM is turned on,
Time of PWM latch timer Time until switching starts after inputting PWM
time of PWM latch timer and SCP detection time after EN
is turned on at external brightness.
COUP
(However, after is turned on, <is deleted from
the sequence because doesn't operate. )
Each sequence
②<④<③⇒SCP is detected and No LED light.
OUTL
④<②<③⇒LED lighting
SS
④<③<②⇒LED lighting
About Dirating of the LED current that uses THM
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.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
7/23
2012.06 - Rev.C

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