SiC and GaN Power
Converter Analysis Kit
Instruction Guide
2
SIC AND GAN POWER
CONVERTER ANALYSIS KIT
1. 5 Series MSO: (1 GHz) Oscilloscope
2. 5-PWR Software: Power analysis software
3. TIVH08: (2.5 kV, 800 MHz) High voltage isolated
differential probes
4. TIVH05 (Optional): (2.5 kV, 500 MHz) High voltage
isolated differential probes
5. TIVM1 (Optional): (50 V, 1 GHz) High BW Isolated
differential probes
6. TPP1000 (Free): (1 GHz) High BW passive probe.
Comes standard with scope. One per channel.
7. MMCX Tip for TPP1000 (Optional): Passive probe
MMCX Tip for high BW performance.
8. GaN Half-bridge Demo Board Guide: Instruction
Guide for getting started.
* All products come standard with their own
accessories.
Index
3
SIC AND GAN POWER CONVERTER SWITCHING ANALYSIS
Topics
Page
Introduction
4
Evaluation Board Overview
5
Selecting the Right Sensor (Probe) Tips
6
Making Connections
8
Before Making Measurements
9
Powering Up the System
14
Tests:
Test 1: Analyzing dead
time and optimizing switching characteristics
16
Test 2: Making fast
-switching load/drain current measurements using a shunt
21
Test 3: Testing switching/conduction losses and magnetic properties
27
Specifications
34
Introduction
The SiC and GaN Switching Power Converter Analysis Kit
is the ONLY solution in the market that can accurately
characterize most of the critical parameters for optimizing
Power Electronics topologies that use ultra-fast, power
semiconductor switching technology such as SiC, GaN
and even some silicon-based MOSFET and IGBTs.
Characterize:
• VGS, VDSand IDmeasurements on high-side and low-
side switches.
• Dead time optimization, including accurate turn-on,
turn-off and gate-drive timing analysis.
• Switching and conduction loss measurements.
• Magnetic performance, losses and system efficiency.
4
GaN Half-bridge Evaluation Board Connections
USB Power
Main Power
Switch (S3)
MMCX Board
Power Switch (S1)
Square Pin Board
Power Switch (S2)
VGS_High Side (MMCX)
VDS_High Side (MMCX)
VGS_Low Side (MMCX)
VDS_Low Side (MMCX)
Shunt Current (MMCX)
VGS_High Side (Square Pin)
VDS_High Side (Square Pin)
VGS_Low Side (Square Pin)
VDS_Low Side (Square Pin)
Shunt Current (Square Pin)
• Two independent GaN-based half-bridge
circuits.
• Choose between MMCX connectors (top
half) or the Square pin connectors (bottom
half) for your evaluation.
• DC Bus Voltage 50 V; Gate Voltage 5 V
• USB Powered *
2X
*Use both ports of the provided dual-input USB cable. Using any other cable can cause serious damage to the oscilloscope’s USB port.
Selecting the Right Sensor Tip for TIVM
6
Note: Specifications are dependent on the probe tip cable.
ISOVU TIVH SERIES
Sensor Tip Cable
Connection to
DUT
Differential Voltage
Range
Offset Range Input Impedance
Most Sensitive V/div
Setting
Attenuation
SMA Input MMCX
IVTIP1X MMCX ± 1 V ± 2 V 50 Ω // <1 pF 1 mV/div 1X
IVTIP5X (Standard) MMCX ± 5 V ± 10 V 250 Ω // <1 pF 5 mV/div 5X
IVTIP10X MMCX ± 10 V ± 20 V 500 Ω // <1 pF 10 mV/div 10X
IVTIP25X (Standard) MMCX ± 25 V ± 50 V 1.25 kΩ // <1 pF 25 mV/div 25X
IVTIP50X (Standard) MMCX ± 50 V ± 100 V 2.5 kΩ // <1 pF 50 mV/div 50X
For this Demo, TIVM1 probe system is used to measure floating, high dv/dt Gate-Source (VGS) signal:
• Maximum dv/dt: 5 V/1 nS = 5 V/ns
• Maximum differential voltage at the test points: 7 V
pk-pk
• Minimum differential loading (input impedance) that the circuit can tolerate : 1 KΩ
• Required measurement sensitivity (V/div) <50 mV/div
• Sensor tip selected: IVTIP25X: ±25 V; 1.25 kΩ // <1 pF; 25 mV/div
Selecting the Right Sensor Tip for TIVH
7
Note: Specifications are dependent on the probe tip cable
ISOVU TIVH SERIES
Sensor Tip Cable
Connection to
DUT
Differential Voltage
Range
Offset Range Input Impedance
Most Sensitive V/div
Setting
Attenuation
Direct Connection into SMA Input of the Sensor Head
SMA Input MMCX ± 1 V ± 25 V 1 MΩ // 20 pF 1X
Requires MMCX Style female connectors on the DUT
MMCX10X MMCX ± 10 V ± 250 V 10 MΩ // 6 pF 10mV 10X
MMCX50X (Standard) MMCX ± 50 V ± 250 V 10 MΩ // 3 pF 50mV 50X
MMCX250X MMCX ± 250 V ± 250 V 10 MΩ // 2 pF 250mV 250X
Requires 0.100” Pitch (2.54 mm) Square Pins on the DUT
SQPIN100X Square pin ± 100 V ± 600 V 10 MΩ // 3.5 pF 100mV 100X
SQPIN500X (Standard) Square pin ± 500 V ± 600 V 10 MΩ // 3.5 pF 500mV 500X
Requires 0.200” Pitch (5.08 mm) Square Pins on the DUT
WSQPIN1000X Square pin ± 1000 V ± 1000 V 40 MΩ // 3 pF 1.0V 1000X
WSQPIN2500X Square pin ± 2500 V ± 1000 V 40 MΩ // 3 pF 2.5V 2500X
For this Demo, TIVH probe system is used to measure floating, high dv/dt Drain-Source (VDS) signal:
• Maximum dv/dt: 50 V/5ns = 10 V/ns
• Maximum differential voltage at the test points: 50 V
pk-pk
• Minimum differential loading (input impedance) that the circuit can tolerate: 10 kΩ
• Required measurement sensitivity (V/div): 10 V/div
• Sensor tip selected: MMCX50X: ±50 V; 10 MΩ // <3 pF; 50 mV/div
Make Connections – V
DS
and V
GS
Measurements
8
Channel 1: Low Side VGS- TPP1000 and MMCX adapter tip.
Channel 2: High Side VGS- TIVM1 and MMCX25X sensor tip.
Channel 3: High Side VDS- TIVH08 and MMCX50X sensor tip.
Channel 4: Low Side VGS- TPP1000 and MMCX adapter tip.
*Do not use TPP1000 passive probe for any high-side, floating measurements. This can cause serious damage to the oscilloscope input.
Vgs_hi
Vgs_lo
Vds_hi
Vds_lo
Before Making Measurements
1. Once all the connections are made, turn on the
oscilloscope by pushing the power button in the lower
left corner of the front panel.
2. Press ‘Default Setup’ button on the oscilloscope.
3. Turn on Ch1, Ch2, Ch3, Ch4 on the oscilloscope by
double-clicking on the respective channels’ badges on
the bottom ribbon.
4. Before turning the GaN evaluation board ON or making
any measurements, run following settings on all active
channels. (Details on the following pages):
• Self Calibration (IsoVu only)
• Auto Zero (IsoVu only)
• Deskew
• Probe Compensation (passive probes only)
9
Self Calibration for IsoVu Probes
The SELF CAL sequence should always be run on an IsoVu probe after it is
first powered on and has warmed up for 20 minutes.
1. Make sure there is no differential signal present at the sensor tip cable.
2. Press the SELF CAL button on the controller to adjust the operating
point of the measurement system.
3. The indicator blinks orange during the self calibration process; it turns
solid green when the operation completes or solid red when the
operation fails.
• Always run Self Calibration in following situations:
• The measurement system is first attached to the oscilloscope.
• Changes are made to the range (1X|2X), internal compensation or
clamp (ON|OFF) setting.
• The temperature in the sensor head changes more than 10°C.
• The sensor tip cable is changed.
10
Auto Zero for IsoVu Probes
Run Autozero on start or when the displayed waveform is
not centered correctly (for example, due to a small DC
offset error).
1. Make sure there is no differential signal present at
the sensor tip cable.
2. Press the MENU button on the IsoVu controller to
view the Probe Setup menu* on the oscilloscope.
3. Press the Autozero button in the Probe Setup menu
of the oscilloscope.
4. Repeat this for all the connected IsoVu probes.
11
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