BD8381EFV-E2 Rohm Semiconductor, BD8381EFV-E2 Datasheet - Page 11

• 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

●Operation in error circumstances of LED
① LED open detection
②LED short detection
③ LED anode/cathode land GND short detection
© 2010 ROHM Co., Ltd. All rights reserved.
BD8381EFV-M
www.rohm.com
PWMOUT
PWMOUT
OUTH
OUTL
OUTH
OUTL
SW
FB
SW
PWMOUT
OUTH
OUTL
SW
VCC
VCC
Fig.17
Fig.18
Fig.19
VCC
VOUT
VOUT
VOUT
Q1
Short
Q1
RSENSE
OPEN
RSENSE
1
N
11/20
Q1
RSENSE
Short
to GND
N
1
FB
OUTH/OUTL
VOUT/OVP
FAIL2
LEDR
VOUT
FB
OUTH/OUTL
FAIL2
1
VOUT
LEDR-LEDC
0V
OUTH/OUTL
FAIL2
It detects short, and after the timer of △T, error
is detected with FAIL2.
200mV
LED open detection when VOVP≧1.7 and VFB≦50mV
（When it achieves the detection condition, the FP latch is done. ）
50mV
It detects short, and after the timer of △T,
error is detected with FAIL2.
LED OPEN
Capacity dependence connected with CT
LED anode GND short
△T=32770×
0V
0V
0.2V
50mV
1.7V
Switching Duty extends.
Switching stop
fosc
It gets down by LED1 step.
fosc
1
Switching stop
Timer operation of CT after GND
short detection.
FAIL1 becomes Hi→Low.
Switching stop
0V
2010.10 - Rev.0.11
Technical Note