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PDF AC20 Data sheet ( Hoja de datos )
| Número de pieza | AC20 | |
| Descripción | Cemented wirewound resistors | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AC20 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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BCcomponents
DATA SHEET
www.DataSheet4U.com
AC01/03/04/05/07/10/15/20
Cemented wirewound resistors
Product specification
Supersedes data of 17th November 1998
File under BCcomponents, BC08
2000 Oct 20
1 page  
BCcomponents
Cemented wirewound resistors
Product specification
AC01/03/04/05/07/10/15/20
PULSE 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
www.DataSheetg4rUap.chosmbelonging to AC-types with higher Pn.
2. If, contrary to the information above, the applied
peak-voltage and impulse times ti are known. Calculate
the pulse-energy (Ep) in Joules or Wattsec. by the use of
the following formula:
Ep =
-V----p----2
R
× ti (Vp = peak voltage; ti = impulse-time)
By dividing this result with the Rn-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 Rn-value to be used in the application. If this
Rn-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 Pn
or change the Rn-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 ti and
the repetition time tp of the pulses. The parameter is the
Resistance Value. If the pulse shape is known (impulse-time
ti and repetition time tp), draw a line vertically from the
X-axis at the mentioned ti 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 tp/ti.
If the vertical line from the X-axis crosses the applied tp/ti
before reaching the R-line, this tp/ti line gives the maximum
allowed pulse-energy at the Y-axis. If the applied
pulse-energy is known (in Watts) and the impulse-time ti
also, draw a line horizontally from the Y-axis to the crossing
with the pulse-line (ti) and find the possible R-value needed
in this application. The horizontal tp/ti 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.
2000 Oct 20
5
5 Page 
BCcomponents
Cemented wirewound resistors
Product specification
AC01/03/04/05/07/10/15/20
103
pulse
energy
(Ws/Ω)
102
10
1
10−1
www.DataSheet4U.c1o0m−2
10−3
10−4
10−1
AC05
CCB380
1
10
102
103
Rn (Ω)
104
Fig.12 Pulse capability; Ws as a function of Rn.
2500
Vˆ max
(V)
2000
1500
CCB381
1000
500
0
10−6
10−5
10−4
10−3
10−2
10−1
ti (s)
AC05
Fig.13 Pulse on a regular basis; maximum permissible peak pulse voltage (Vˆ max) as
a function of pulse duration (ti).
1
2000 Oct 20
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet AC20.PDF ] | |
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