onsemi EVBUM2901 Hotplate and Double Pulse Generator Evaluation Board Owner’s Manual
- July 25, 2024
- onsemi
Table of Contents
onsemi EVBUM2901 Hotplate and Double Pulse Generator Evaluation Board Owner’s Manual
Hotplate and Double Pulse Generator Description
A Hotplate and Double pulse generator extension board is designed to provide
HOT temperature testing conditions and variable 10pulse PWM generation for a
Discrete double pulse tester.
The Extension board together with the Discrete Double pulse tester supports
HOT temperature testing of all onsemi’s discrete packages (SiC, Si) within
1200 V breakdown voltage using Daughter cards.
The purpose of the Extension board is integrating laboratory PWM generator,
heat source and +5 V output into a compact solution powered from a single 12 V
adapter (Included).
This document provides a user’ manual for using the Extension board together
with discrete Double pulse tester. Details of layout, schematics and bill of
materials are included in the user’s manual.
Evaluation Board Operation
The board is designed as RoHS compliant. Design of the board was not qualified
for manufacturing. No tests were made on whole operating temperature range. No
lifetime tests were performed. The board must be used in laboratory
environment only and must be operated by skilled personal trained on all
safety standards. Further details of used components are in their respective
datasheets. PWM resolution and value of sensed temperature are indicative.
Features
- Hotplate PCB with Low Thermal Resistance
- Hotplate Temperature Regulation (OFF, 125°C, 150°C, 175°C)
- 10pulse PWM Generator (5 V, Freq. 30 kHz, Pulse Width from 0.2 s to 10 s)
- Fully Compatible with Discrete Double Pulse Tester
- Power Adapter Included
- Intuitive Interface Using LED Indicators and Display
Discrete double pulse tester user’s manual: EVBUM2897
Figure 1. Hotplate and Double Pulse Signal Generator Board
APPLICATIONS INFORMATION
Controlling Board
The control board is powered from AC/DC 12 V 40 VA adapter (included). The
power supply part contains a linear LDO source +8 V, +8 Vref. for powering the
NUCLEO F303K8 control processor. Power Source +5 V 1 A is intended for
external discrete DPT power supply (+VCC connector).
The Controlling board can be used simultaneously for generating a PWM signal −
SMA connector signal OUT and controlling heat for hotplate module (connector
HOTPLATE).
Generator control and hotplate control are separated. The buttons can be used
to select functions (START generation, Pulse width length, temperature
selection) LEDs indicate the set hotplate temperature.
Figure 2. Controlling Board
HOTPLATE Board
Hotplate PCB is a 1−layer IMS PCB adapted for mounting to discrete daughter
cards. The PCB is assembled with two heating resistors R1, R2 in series
connection. The NTC thermistor senses actual temperature on the hotplate.
Thermal conducting pad is included. For better heat distribution on the DUT
transistors, it is recommended to stick it on the HOTPLATE module.
Figure 3. Hotplate Board, Thermal Conducting Pad
Temperature Regulation
The temperature is regulated by a regulation loop using Anti−WindUp
Proportional−Sumation Controller. The output of this controller is a variable
duty cycle (generated using 30 kHz switching frequency), which controls
heating resistors on the Hotplate. Power switching of the heating resistors is
ensured by onsemi’s 47 m N−Channel Logic Level Power MOSFET, controlled
directly from +5 V/0 V logic. Temperature sensing is ensured using 4.7 k NTC
on a Hotplate. Measured temperature range is limited by 200°C upper limit and
100°C lower limit (non−linear properties of NTC). The regulation loop
schematic is shown on Figure 4.
Figure 4. Regulation Loop Block Schematic
Figure 5. Describes User’s Controlling of the Hotplate
There is only single button which switches between 4 states when pressed.
Double Pulse Generating
10pulse generation includes 3 seconds delay before the generation and also 2
seconds delay after the generation. This is implemented because of safety and
user’s comfort. START button is disabled when 10pulse generation (including
delay) is in progress.
Figure 6. Timing Waveform Double Pulse Generating
Protective Functions
10pulse generation feature of the board can be simply excluded by user’s
controlling or disconnecting signal output. Heat generation feature using
Hotplate can be also simply excluded by user’s controlling or disconnecting
Hotplate from a connector. Software in microcontroller includes feature for
detection of Hotplate’s disconnection. Figure 8 shows Hotplate’s disconnected
status shown on a display. Status of set temperature is set to default off
state when every disconnection is detected.
Figure 8. HOTPLATE Connector Disconnected and Connected Display Status
Figure 9. Hotplate Board Connection Schematic
Measurement Process
Turning on procedure Discrete DPT together with Hotplate.
- Ensure that all power sources are turned off
- Ensure that setup is fully prepared (check connection of a High Voltage power source, used gate resistors, used Daughter cards, using thermal conducting pad between Hotplate and tested devices, probes connection according to Figure 12 etc.)
- Plug 230 VAC/12 VDC Adapter into controlling board, then into 230 VAC Grid
- Make sure that all power supply indication LEDs glow
- Verify that high side and low side gate to source voltages are equal to VEE (VEE defined by used insulated DC/DC)
- Do a testing 10pulse generation using START button and check corresponding between measured Gate to Source signal and information showed on a display
- Make sure that Pulse Width is set to 0.2 s
- Turn on High voltage power supply
- Do a Double Pulse Testing with respect to limits of tested devices
ATTENTION : Touch only user buttons when using with the powered controlling board, connecting or disconnecting hotplate from its connector must be done before powering the controlling board.
CAUTION : Do not touch HOTPLATE board and daughter card during operation. The temperature reaches up to 175°C. Risk of burns! Wait a few minutes after turning off the heating.
Figure 10. Mounting Hotplate on the Daughter Card TOLL and TO247−4L Package
Recommended mounting to the daughter card is using set high temperature nylon
screws M3x15 mm (included)
Recommended mounting torque ≈ 0.05 − 0.2 Nm
Figure 11. Measurement Setup − Discrete DPT + Extension Board Hotplate and Double Pulse Signal Generator
Figure 12. Double Pulse Test Setup for HOT Temperature
Application Test
Figure X shows thermal camera measurements for 150°C set temperatures. The
measurements show that NTC’s temperature corresponds to a set temperature.
Temperature at the tested device’s package is very similar to a set
temperature, because of a designing NTC into the middle of the hotplate and
designing heating resistors as close as possible to the tested device’s
package. The purpose of the heat generation using the hotplate is providing
very similar testing conditions for a testing device with very similar
package.
Figure 15 shows Double pulse test waveforms VDS, I D , VGS in hot temperature 150°C. Measurement setup was used according to Figure 11 and 12. The waveforms do not show any large oscillations during switching.
Figure 13. onsemi Safety Box for Double Pulse Testing
Figure 14. Thermal Camera Measurements
Figure 15. Double Pulse Test Waveforms in Hot Temperature TO247−4L NTH4L022N120M3S
Waveforms: blue − VGS, green − ID, red − VDS
DPT conditions: V DC = 800 V, I D ≈ 70 A, R G = 3R9, T j = 150°C, VGS = 18/−3 V, PW = 1.4 s
Controlling Board Schematic
Figure 16. Controlling Board Schematic
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