Texas Instruments TMCS1100, User Manual, Page: 8 / 18

+
±
Hot-Sup ply
”
600 V
Electronic Load
+
±
cold-supply
3 V to 5 V
Shu nt to G ND
+
±
Hot Su pply
”
600 V
Electronic Load
+
±
VREF S upply
0 V to VCC
+
±
Cold Supp ly
3 V to 5 V
Exte rnal Supp ly
Or
Buffered Voltage Divider
Operation
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8 SBOU209A – August 2019 – Revised March 2020
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TMCS1100EVM
4 Operation
The following are instructions to set up and use the TMCS1100EVM. For the following instructions, x = A
to D for the A1 to A4 gain variants, respectively.
Figure 1 shows an example of a simple, low-side,
unidirectional setup on the A1 (50 mV/A) gain variant (x = A). For bidirectional measurements, the user
can either connect jumper J1x to the buffer with a custom voltage divider set by the user, or connect an
additional external supply to the
VREF SOURCE and GND test points, as shown in Figure 2 . This device
has isolation; external supplies are distinguished by hot for load, cold for DUT supply, and REF for VREF
supply. Short the GND terminals for the cold and REF supplies together. The hot supply can be isolated
and at a different potential.
Figure 1. Low-Side Unidirectional Setup Figure 2. Low-Side Bidirectional Setup
Step 1. For greater maneuverable flexibility, break apart the EVM sub boards along the score lines.
Otherwise, the board can be left intact.
Step 2. Attach the high-current lug connectors to IS+ and IS– of the gain version to be tested.
Step 3. Connect the terminals of an external cold supply to the GND and VCC test points on the EVM
gain variant of choice. Be sure to connect GND first and make sure that the external cold
supply is between 3 V and 5.5 V.
Step 4. To set the VREF voltage, use an external REF supply, use a buffered voltage divider, or
short VREF to GND. When VREF is supplied by the buffered voltage divider, set the jumper
to short VREF to the buffer pin on connector J1x. When the VREF voltage is supplied by an
external REF supply, remove the jumper short from J1x, and apply a supply to the VREF
SOURCE and GND test points with a voltage set between GND and VCC.
Step 5. Connect the input per Section 4.1 .