BD8381EFV-M 查看數據表（PDF） - ROHM Semiconductor

零件编号

产品描述 (功能)

生产厂家

BD8381EFV-M

LED Drivers for Automotive Light

ROHM Semiconductor 

BD8381EFV-M

Technical Note

●Error all condition

Protection

UVLO

Detecting Condition

[Detect]

VREG<4.3V

[Release]

VREG>4.45V

TSD

Tj>175℃

Tj<150℃

OVP

VOVP>2.0V

VOVP<1.45V

OCP

SCP

LED open

LED short

VCS≦VCC-0.6V

VFB<0.05V

(150ms delay when CT=0.1µF)

VFB<0.05V & VOVP>1.7V

lVLEDR-VLEDCl>0.2V

(100ms delay when FOSC=300kHz)

VCS>VCC-0.6V

EN or UVLO

EN or UVLO

EN or UVLO

Operation after detect

All blocks (but except REG)

shut down

All blocks (but except REG)

shut down

SS discharged

SS discharged

Counter starts and then latches off

all blocks (but except REG)

Counter starts and then latches off

all blocks (but except REG)

Counter starts and then latches off

all blocks (but except REG)

●Protection sequence

Vcc

EN

①

VREG

UVLO

THM

(Input by the

resistance division

of VREG. )

SYNC

DRLIN

SS

OUTL

VOUT

4.5V

Release

②

②

②

Fig.17

Power supply turning on sequence

① Please turn on EN with Vcc≧4.5V or more after impressing Vcc.

② Please fix the potential of DRLIN and THM before turning on EN.

③ A soft start operates at the same time as turning on EN, and the switching is output.

④ After turning on VCC, the order is not related to other input when inputting external PWM from VTH.）

※It leads to the destruction of IC and external parts because it doesn't error output according to an external constant of

adjacent pin 24pin SW terminal, 25pin OUTH terminal, 26pin CS terminal and 27pin BOOT terminal.

www.rohm.com

© 2011 ROHM Co., Ltd. All rights reserved.

9/20

2011.04 - Rev.A

Share Link: