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Accu-Guard ?
SMD Thin-Film Fuse
DESIGNING FOR CURRENT
PULSE SITUATIONS
1. Sine wave current pulse
The Joule integral for sine wave pulse is
[(I max. ) 2 x t]/2,
see Fig. 1a.
l max.
2. Triangular current pulse
The Joule integral for triangular pulse is
[(Imax.) 2 x t]/3,
see Fig. 2a.
t
l max.
t
Fig. 1a. Sine wave pulse parameters for Joule
integral calculation, example #1.
Thus, for the current pulse in Figure 1b, the Joule integral is
[(4.8A) 2 x 7.7 x 10 -6 sec]/2 = 8.9 x 10 -5 A 2 sec.
10 μ sec/div
1A/div
Fig. 1b. Sine wave pulse, example #1.
The pulse duration is 7.7μsec. We must find a fuse that can
absorb at least 8.9 x 10 -5 X 2 = 1.8 x 10 -4 A 2 sec Joule inte-
gral within 7.7 μsec without actuation. According to the I 2 t
graph on page 6, pre-arcing Joule integral is 2.3x10 -4 A 2 sec
for the 0.5A fuse, which is slightly more than needed. The
next lower rating (0.375A), has only 6x10 -5 A 2 sec, which is
not enough. Therefore, 0.5A fuse should be chosen for this
application, see Figure 1c.
Fig. 2a. Triangular pulse parameters for Joule
integral calculation, example #2.
Thus, for the current pulse in Figure 2b, the Joule integral is
[(1.5A) 2 x 3 x 10 -3 sec]/3 = 2.25 x 10 -3 A 2 sec.
2 msec/div
0.5A/div
Fig. 2b. Triangular pulse, example #2.
The pulse duration is 3 msec. In the I 2 t graph on page 6, pre-
arcing Joule integral for 3 msec pulse is 4 x 10 -3 A 2 sec for the
0.5A fuse (not enough) and 2 x 10 -2 for the 0.75A fuse (more
than enough). Therefore, 0.75A fuse should be chosen for
this application, see Figure 2c.
FUSE PRE-ARCING JOULE INTEGRALS
vs. PRE-ARCING TIME
FUSE PRE-ARCING JOULE INTEGRALS
vs. PRE-ARCING TIME
100
10
PRE-ARCING TIME l 2 t, A 2 sec
100
PRE-ARCING TIME
l 2 t,
A 2
sec
1
10 -1
10
1
10 -1
10 -2
10 -3
10 -4
0.75A
x
10 -2
10 -3
0.5A
10 -5
10 -7 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1
PRE-ARCING TIME, sec
1
10
10 -4
10 -5
x
Fig. 2c. Choice of 0.75A fuse, example #2.
10 -5 10 -4 10 -3 10 -2 10 -1
10
10
1
10
32
-7 -6
PRE-ARCING TIME, sec
Fig. 1c. Choice of 0.5A fuse, example #1.
Pre-arcing I 2 t
Maximum I 2 t design rule
I 2 t for sample current pulse
X
X
Pre-arcing I 2 t
Maximum I 2 t design rule
I 2 t for sample switch-on pulse
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