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Comparison of eFuse IC performance with conventional fuses
Results of short circuit protection operation
|
eFuse IC (TCKE812NL) |
Polyfuse |
Chip fuse |
|---|---|---|---|
Rated current |
3 A (Setting) |
3.1 A (Rated) |
3 A (Rated) |
Interruption time |
2 μs |
2.9 S |
7 μs |
Protective operation review |
|
|
|
It was confirmed that a large current of 70A or more flowed momentarily in the poly fuse and chip fuse, and the chip fuse was broken.
The figure above shows the result of comparing the short circuit protection performance between the eFuse IC and the conventional fuse (poly fuse, chip fuse).
We were checking how long the output current turned off when the output is short-circuited to GND.
(For comparison, the overcurrent settings of the eFuse IC, poly fuses, and chip fuse ratings were unified around 3A.)
As a result, the off time of the eFuse IC on the left side was about 2 μs, while that of the poly fuse in the middle figure was about 3 seconds, and that of the chip fuse in the right figure was about 7 μs.
The peak current was also suppressed to about 35A by the eFuse IC.
On the other hand, conventional fuses did not fit in the measurement range, and a large current of 70A or more flowed.
Basics of eFuse ICs
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