SDAA115 November 2025 INA190

3 Results

To test the PCB layouts, first the Device Under Test (DUT) was connected to a DC supply (Xantrex XHR 7.5-80), electronic load (Kikusui PLZ1205W) and a precision resistor as shown below in Figure 3-1. The shunts used in bench test were all 300µΩ, hence R_effective is calculated to be 100µΩ. TL-BR spade connector combination was used to flow current through the DUT.

Figure 3-1 Bench Test Setup Schematic

The precision resistor of 0.01Ω used in the bench test was to accurately determine the load current flowing in the circuit. A Keysight 3458A digital multimeter was used here to determine voltage drop across the precision resistor (V_shunt), then this value is divided by the resistance (0.01Ω) to calculate the load current (I_load Real). Another Keysight 3458A was connected across the OUT pin of DUT and ground to measure V_out.

The results are listed in Table 3-1 and the Error% against load current is plotted in Figure 3-2.

E r r o r % = ((| E x p e c t e d V o u t - M e a s u r e d V o u t |) / E x p e c t e d V o u t) \times 100

Table 3-1 Bench Test Results

	Layout 1			Layout 2			Layout 3			Expected
I_load (A)	DUT V_out (V)	V_shunt (mV)	I_load Real (A)	DUT V_out (V)	V_shunt (mV)	I_load Real (A)	DUT V_out (V)	V_shunt (mV)	I_load Real (A)	DUT Vout (V)
5	0.1042879	50.03929	5.003929	0.089697	50.02368	5.003966	0.1013517	50.03966	5.002368	0.100
10	0.2095919	100.0095	10.00095	0.180312	100.0349	10.004928	0.2036846	100.04928	10.00349	0.200
15	0.3148474	150.0678	15.00678	0.27096	150.0546	15.0068	0.3061003	150.068	15.00546	0.300
20	0.4200059	200.0935	20.00935	0.361594	200.0807	20.00913	0.4085625	200.0913	20.00807	0.400

Figure 3-2 Layout Comparison Plot