Thin Film Chip Fuse

Document No

TCH-XXOS001A

Issued date

2012/06/28

Page

10/13

TA-I TECHNOLOGY CO., LTD

█ Derating ratio for different ambient Temperature

◎ Referring to bottom figure and select the appropriate derating ratio :

e.g., Ambient temperature is 60 degree C

the derating ratio ≒ 0.95

█

Calculating the required rating of fuse needed .

◎ Safety coefficient : 70 % is safety coefficient from practical experience

◎

< rating current of fuse

e.g.,

Condition :

Normal operating current =1.5 A

Ambient temperature 40 ℃ : Derating ratio ≒ 0.95

< rating current of fuse

Normal Operating Current

0.7 x derating ratio

1.5

0.7 x 0.95

105

2.255 < rating current of fuse

Ambient temperature

Safety coefficient