參數(shù)資料
型號(hào)： AC07
廠商： NXP Semiconductors N.V.
英文描述： Cemented wirewound resistors
中文描述： 硬質(zhì)合金線繞電阻
文件頁(yè)數(shù)： 5/24頁(yè)
文件大?。?/td> 144K
代理商： AC07
2000 Oct 20
5
BCcomponents
Product specification
Cemented wirewound resistors
AC01/03/04/05/07/10/15/20
P
ULSE
LOADING
CAPABILITIES
How to generate the maximum allowed pulse-load from the graphs composed for wirewound resistors of the AC-types.
Single pulse condition; see
Fig.3
1.
If the applied pulse energy in Joules or Wattseconds is
known and also the R-value to be used in the
application; take the R-value on the X-axis and go
vertically to the curved line. From this point go
horizontally to the Y-axis, this point gives the maimum
allowed pulse energy in Joules/ohm or Wattsec./ohm.
By multiplying this figure with -value in use gives the
maximum allowed pulse-energy in Joules or Wattsec. If
this figure is higher than the applied pulse-energy the
application is allowed. Otherwise take one of the other
graphs belonging to AC-types with higher P
n
.
2.
If, contrary to the information above, the applied
peak-voltage and impulse times t
i
are known. Calculate
the pulse-energy (E
p
) in Joules or Wattsec. by the use of
the following formula:
2
R
(V
p
= peak voltage; t
i
= impulse-time)
By dividing this result with the R
n
-value of the R in use,
gives the value Wattsec./ohm on the Y-axis. Draw a line
horizontally to the curved line and at the intersection
the vertical line to the X-axis gives the maximum
allowed R
n
-value to be used in the application. If this
R
n
-value is higher than the R-value to be used in the
application, the application is allowed. If not, take one
of the other graphs belonging to AC-types with higher P
n
or change the R
n
-value to be used.
Repetitive pulse condition; see
Fig.2
With these graphs we can determine the allowed
pulse-energy in Watts depending on the impulse- time t
i
and
the repetition time t
p
of the pulses. The parameter is the
Resistance Value. If the pulse shape is known (impulse-time
t
i
and repetition time t
p
), draw a line vertically from the
X-axis at the mentioned t
i
to the line of the involved R-value.
From the intersection the horizontal line to the Y- axis
indicates the maximum allowed pulse-load at a certain t
p
/t
i
.
If the vertical line from the X-axis crosses the applied t
p
/t
i
before reaching the R-line, this t
p
/t
i
line gives the maximum
allowed pulse-energy at the Y-axis. If the applied
pulse-energy is known (in Watts) and the impulse-time t
i
also, draw a line horizontally from the Y-axis to the crossing
with the pulse-line (t
i
) and find the possible R-value needed
in this application. The horizontal t
p
/t
i
lines give the
maximum allowed pulse-load till they reach the R-line, that
point indicates the maximum allowed impulse-time ti at the
horizontal axis.
Ep
Vp
t
i
×
=
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