Time (
P
s)
Am
plitude
(V
or
A)
-20
-10
0
10
20
30
40
50
60
70
80
0
4
8
12
16
20
24
28
32
36
40
D006
Voltage (V)
Current (A)
Board Setup
3
SLVUBJ8 – October 2018
Copyright © 2018, Texas Instruments Incorporated
Flat Clamp TVS Evaluation Module—Adaptor Boards
To install the EVM, remove the existing surge protection solution, cut out the adapter board needed for
your applications and place the adaptor board in the existing footprint. If there is no existing surge
protection solution in the system, the EVM can still be tested by soldering the bottom plates of the adaptor
board over the protected line and a ground plane. In the unidirectional configuration, pin 1 of the adapter
board must be installed pointing towards ground, pin 1 can be seen by the silkscreen bar on one side of
the unidirectional adaptor boards. In the bidirectional configuration either pin can be connected to ground
or input signal. Each adapter board has solder pads on the bottom extending to the edge allowing the
board to be soldered down.
2.1
Surge Testing
The adaptor provides an easy way to test the TVSxx0x surge protection as defined in IEC 61000-4-5.
Evaluate the TVSxx0x surge protection by exposing the protected line to a surge event. The event must
be created by a combinational waveform generator (CWG) in series with a 40-
Ω
coupling resistor as
shown in
. Test at different surge current levels and observe that the voltage on the line is
clamped to a safe level for the protected system. After the surge event, post-test the system to ensure that
no damage or shift in leakage currents occurred.
Figure 3. Surge Test Setup Unidirectional Configuration
The waveform in
shows the response of the TVSxx0x Unidirectional adaptor board to a 30-A
surge waveform created by a similar setup as in
. Despite the 35 A of current over a IEC 61000-4-
5 surge waveform, the TVS3300 holds the voltage on the line to a maximum of 37 V, robustly protecting
the downstream components.
Figure 4. TVS3300 35-A Surge Clamping Waveforms
This is just one of the 6 different voltage level devices on the adapter board with all of them having
superior clamping for their node.