25VT6A5VGEVB
http://onsemi.com
4
Test Points Description
Monitoring the Input Voltage
The input voltage can be monitored by using the test
points at J9 and J10 on the 25VT6A5VGEVB evaluation
board. This allows the user to find out the exact value of
input voltage since there will be no losses from the cables or
connectors.
Monitoring the Output Voltage
The 25VT6A5VGEVB evaluation board provides two
test points for measuring the output voltage without any
losses from the cables or connectors. The output voltage can
be measured at the points J11 and J12 on the evaluation
board.
Monitoring the Switch Node Waveforms
The 25VT6A5VGEVB evaluation board provides the
opportunity to monitor the switch node waveforms. The
probe socket at test point JS8 provides the switch node
waveforms.
Monitoring the High Side and Low Side Waveforms
The high
side
waveforms can be obtained from the probe
socket at test point JS6 and the low side waveforms can be
obtained from the probe socket at test point JS10.
The probe sockets that are provided on the evaluation
board for monitoring the waveforms are such that the
oscilloscope probes can be inserted into the probe socket and
are held in place. The Test Point and the Probe Socket are
shown in Figure 3.
Monitoring the PWM Signal
The PWM signal from the controller to the driver can be
monitored from the probe socket provided at JS11.
Figure 3. Tektronix Test Point & Probe Socket
Part #: 700503100
TEST EQUIPMENT REQUIRED
Voltage Sources
(i) DC Supply Source for Input Voltage
The input voltage source should be a 0 to 20 V DC source.
The input voltage may be increased further depending on the
parts that are being used on the 25VT6A5VGEVB
evaluation board such that the part can withstand the applied
voltage. Hence, based on the required input voltage to be
applied, the requirement of the DC power supply varies.
(ii) DC Supply Source for Driver Voltage
The supply source for the driver should be a 0 to 10 V
source. The driver voltage should never exceed 6.5 V.
Electronic Load
The electronic load supplied to the 25VT6A5VGEVB
evaluation board ranges from 0 A to 25 A. Hence a DC
current source of 0 A to 30 A is needed for the evaluation
board.
Meters to Measure Voltages and Currents
In the 25VT6A5VGEVB Evaluation Board, the voltages
that are to be measured are
Vin, Vout and
Vdrv.
The set up for
measuring these voltages are shown in Figure 4. The
connecting wires from the output terminal to the electronic
load should be thicker in order to avoid losses and to
measure the exact voltage at the end of the terminals.
Oscilloscope
The oscilloscope is used to monitor the gate and switch
node waveforms. This should be an analog or digital
oscilloscope set for DC coupled measurement with 50 MHz
bandwidth. The resolution can be set at 5 V/division
vertically and 20ns/division horizontally. The oscilloscope
channels can be connected at various test points such as high
side gate (JS6), low side gate (JS10), switch node (JS8), the
driver PWM Signal (JS11), V
in (sense)
(J9 & J10) and V
out
(sense)
(J11 & J12).
