AN3222 Datasheet, PDF (10/18 Pages) STMicroelectronics – Demonstration board user guidelines

Theoretical and practical measurements
Figure 6. Case 1: Rshunt = 3 mΩ, Rg = 100 Ω, Rf = 150 kΩ, Imax = 1 A
AN3222
Vout vs Isense/Imax
10
1
1
0.1
10
100
0.01
part0
part1
Isense/Imax (%)
part2
part3
part4
Vout_min
Vout_max
Absolute error on Vout vs Isense/Imax
1000
100
10
1
1
0.1
Err_max
10
Isense/Imax (%)
err0
err1
err2
err3
100
err4
Figure 7. Case 2: Rshunt = 10 mΩ, Rg = 100 Ω, Rf = 47.5 kΩ, Imax = 1 A
10
1
1
0.1
0.01
Vout_max
Vout vs Isense/Imax
10
Vout_min
Isense/Imax (%)
part0
part1
part2
100
part3
part4
Absolute error on Vout vs Isense/Imax (%)
100
10
1
0.1 ¹
0.01
0.001
0.0001
10
100
Isense/Imax (%)
Err_max
err0
err1
err2
err3
err4
Figure 8. Case 3: Rshunt = 30 mΩ, Rg = 100 Ω, Rf = 16.2 kΩ, Imax = 1 A
Vout vs Isense/Imax
10
1
1
0.1
10
100
0.01
part0
part1
Isense/Imax (%)
part2
part3
part4
Vmax
Vmin
Absolute error on Vout vs Isense/Imax
100
10
1
1
0.1
10
100
0.01
Isense/Imax (%)
err0
err1
err2
err3
err4
err_max
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Doc ID 17551 Rev 1