BD8622EFV_09 ROHM [Rohm], BD8622EFV_09 Datasheet - Page 12

• Manufacturer Part Number: BD8622EFV_09
• Description: Built-in 1ch FET Light Load Type DC / DC converters
• Manufacturer: ROHM [Rohm]

© 2009 ROHM Co., Ltd. All rights reserved.
BD8622EFV
www.rohm.com
Protecting BUS function with terminal PDET
The terminal PDET (3 pins) monitors whether IC is normal or not. When IC becomes abnormal, the PDET output is reduced
at "L" level with the output voltage fixed “L” level at the same time. Moreover, it is possible to make the output fix in a low
level by compulsorily reducing the terminal PDET at "L" level from the outside.
When two or more BD8622EFV is used in the application, this function prevents the IC from destroying, because one IC
error transmits all other ICs by PDET line in the condition that PDET terminals are connected each other.
Error detection (off latch) release method
BD8622EFV enters the state of an off latch when the protection function operates.
To release the off latch state, EN terminal voltage should be changed to low level once time.
※Please give the terminal PDET as OPEN when you do not use protecting BUS function.
170kΩ
IC_A
VIN
Fig.10 Protecting BUS communication
PDET
12/15
PDET
VIN
170kΩ
IC_B
Technical Note
2009.05 - Rev.A