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Rohm Semiconductor Electronic Components Datasheet

BD8381AEFV-M Datasheet

LED Drivers

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Datasheet
LED Drivers for Automotive Light
BD8381AEFV-M
General Description
BD8381AEFV-M is a white LED driver with the
capability of withstanding high input voltage (50V MAX).
It has also an integrated current-mode, buck-boost
DC/DC controller to achieve stable operation against
high input voltage and to remove the constraint of the
number of LEDs in series connection.
The LED brightness is controlled by either linear or
PWM signal and is also possible to be controlled even
without using a microcomputer, but instead, by means
of the built-in PWM brightness signal generation circuit.
Key Specifications
Input Supply Voltage Range:
Operating Temperature Range:
5.0V to 30V
-40°C to +125°C
Package
W(Typ) x D(Typ) x H(Max)
Features
Integrated buck-boost current-mode DC/DC
controller
Built-in CR timer for PWM brightness
PWM linear brightness
Built-in protection functions (UVLO, OVP, TSD, OCP,
SCP)
LED error status detection function (OPEN/
SHORT)
HTSSOP-B28
9.70mm x 6.40mm x 1.00mm
Applications
Headlight and Daytime Running Light etc.
Typical Application Circuit and Block Diagram
Vin VREG
FAIL1
VCC
VREG
UVLO TSD
OVP
OCP
OVP
CS
EN
SYNC
RT
COMP
VREG
SS
INP1 INP2
THM
DRLIN
VREG
DISC
VTH
PWM
Timer
Latch
Control Logic
OSC SLOPE
PWM
OCP OVP
SS
ERR AMP
-
+
+
DRV
CTL
VREG
SHORT
Det
BOOT
OUTH
SW
DGND
OUTL
GND
LEDR
LEDC
PWMOUT
FB
CR
TIMER
OPEN/ SHORT/ SCP Detect
Timer
Latch
Open Det
SCP Det
FAIL2
PGND
CT
COUT
Product structure: Silicon monolithic integrated circuit
.www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ22111 14 001
This product has no designed protection against radioactive rays
1/36
TSZ02201-0T1T0C700160-1-2
31.Oct.2014 Rev.001


Rohm Semiconductor Electronic Components Datasheet

BD8381AEFV-M Datasheet

LED Drivers

No Preview Available !

BD8381AEFV-M
Pin Configuration
Pin Descriptions
(TOP VIEW)
1 28
2 27
3 26
4 25
5 24
6 23
7 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
Pin Symbol
Function
1 COMP Error amplifier output
2 SS Soft start setting input
3 VCC Input power supply
4 EN Enable input
5 RT Oscillation frequency-setting resistance input
6 SYNC External synchronization signal input
7 GND Small-signal GND
8 THM Thermally sensitive resistor connection pin
9 FB ERRAMP FB signal input pin
10 DISC CR Timer discharge pin
11 VTH CR Timer threshold pin
12 DRLIN DRL switch pin (Pulse output setting pin)
13 FAIL1 Failure signal output
14 FAIL2 LED open/short detection signal output
15 OVP Over-voltage detection input
16 LEDC LED short detection pin (LED detection side)
17 LEDR LED short detection pin (Resistor detection side)
18 N.C.
-
19 PGND PWM brightness source pin
20 PWMOUT PWM brightness signal output pin
21 CT GND short protection timer setting pin
22 OUTL Low-side external FET Gate Drive out put
23 DGND Low-side FET driver source pin
24 SW High-side FET Source pin
25 OUTH High-side external FET Gate Drive out put
26 CS DC/DC output current detection pin
27 BOOT High-side FET driver source pin
28 VREG Internal reference voltage output
www.rohm.com
© 2014 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
2/36
TSZ02201-0T1T0C700160-1-2
31.Oct.2014 Rev.001


Part Number BD8381AEFV-M
Description LED Drivers
Maker ROHM
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BD8381AEFV-M Datasheet PDF





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