MBR10H100CT
http://onsemi.com
5
MERCURY
SWITCH
VD
ID
DUT
10 mH COIL
+VDD
IL
S1
BVDUT
IL
ID
VDD
t0
t1
t2
t
Figure 10. Test Circuit
Figure 11. Current?Voltage Waveforms
The unclamped inductive switching circuit shown in
Figure 10 was used to demonstrate the controlled avalanche
capability of this device. A mercury switch was used instead
of an electronic switch to simulate a noisy environment
when the switch was being opened.
When S1
is closed at t
0
the current in the inductor I
L
ramps
up linearly; and energy is stored in the coil. At t1
the switch
is opened and the voltage across the diode under test begins
to rise rapidly, due to di/dt effects, when this induced voltage
reaches the breakdown voltage of the diode, it is clamped at
BVDUT
and the diode begins to conduct the full load current
which now starts to decay linearly through the diode, and
goes to zero at t2.
By solving the loop equation at the point in time when S1
is opened; and calculating the energy that is transferred to
the diode it can be shown that the total energy transferred is
equal to the energy stored in the inductor plus a finite amount
of energy from the VDD
power supply while the diode is in
breakdown (from t1
to t
2) minus any losses due to finite
component resistances. Assuming the component resistive
elements are small Equation (1) approximates the total
energy transferred to the diode. It can be seen from this
equation that if the VDD
voltage is low compared to the
breakdown voltage of the device, the amount of energy
contributed by the supply during breakdown is small and the
total energy can be assumed to be nearly equal to the energy
stored in the coil during the time when S1
was closed,
Equation (2).
BV
WAVAL
1
2LI
2
LPK
DUT
BVDUTV
DD
WAVAL
1
2LI
2
LPK
EQUATION (1):
EQUATION (2):
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