National Instruments ISO5851, User Manual

Page: 5 / 16

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Example Measurements
2.2.3 DESAT
The EVM comes populated with a 220-pF DESAT capacitance. Pin1 on JMP3 can be used to apply a
signal directly to the DESAT pin.
For evaluation with the default 1-nF load, when actual IGBT is not connected as load, the desaturation
function should be disabled by connecting the DESAT pin to GND2 by shunting pin 1 to pin 2 on JMP3.
2.2.4 CLAMP
By default, the CLAMP pin is connected to the output via a 0-
Ω
resistor (R6). The CLAMP feature can be
disabled by removing R6. CLAMP can be monitored via TP14, and a signal can be applied directly to the
CLAMP pin via JMP4.
3 Example Measurements
Figure 4 illustrates measurements performed under the default EVM configuration. For these
measurements, V
IN-
is connected to GND1.
Figure 4. ISO5851 EVM Input and Output With Unipolar Output Supply
Figure 4 shows the input and output of the ISO5851 EVM for a 100-kHz clock with R
G
= 10 Ω (R3) and
R12 = 10 Ω and a unipolar output supply (V
CC2
= 15-V, V
EE2
= GND2). The output is measured at TP12.
5 SLLU218 – June 2015 ISO5851 Evaluation Module
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