23
This configuration allows one HCSMU to connect to the base terminal of the power
BJT instead of HPSMU and allows to drive the base with more than 1 A. This con-
figuration is useful for using less than 500 µs pulse to the base, which is limited to
minimum 500 µs in the case of HPSMU, though the minimum 50 µs pulse is effec-
tive in a collector even with the HPSMU connected to the base.
This configuration is also effective where the hFE of the power BJT is less than 10
at Ic=20 A. In this case, the base HCSMU can drive more than 1 A base current
which is necessary to drive the collector to the maximum 20 A limit of one HCSMU
connected to the collector.
The 40 A configuration by connecting two HCSMU in parallel is introduced in the
appendix A3 section, and HPSMU has to be used to drive the base in this configura-
tion. This configuration is most effective for the power BJT, the hFE of which is lar-
ger than 40 at Ic=40 A, because the base HPSMU, the maximum output current of
which is 1 A, can drive the base sufficiently to fully swing the collector of the power
BJT.
Connect the cables between the B1505A and the N1259A as shown in figure 2-9 by
following the step number 1 to 7.
The breakdown of each steps with cable figures and the connector locations are
shown in figure 2-10.
2-4-2. 1 x HPSMU and 2 x HCSMU 20 A configuration
Back side of the B1505A
Back side of the N1259A
1
3
5
4
B1513A
HVSMU
B1512A
HCSMU
B1510A
HPSMU
B1520A
MFCMU
GNDU
B1512A
HCSMU
2
Leave it open
Triax
7
6
Coax
Figure 2-9. Connections for 1x HPSMU and 2x HCSMU 20 A Configuration.
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