Hi team，
IINDPM on customer board is out of the accuracy. And I let them test the voltage of sense resistor (ACP/ACN) and the IDAPT pin voltage to make a compare.
The test data is as below(their setting is 20X):
|
Iout (A) |
Iin (A) |
DC Source V/A |
Vsense_dif (mV) |
IADPT (mV) |
Gain |
|
1 |
0.555 |
19.99 / 0.557 |
5.6 |
166 |
29.6429 |
|
2 |
1.041 |
19.99 / 1.045 |
10.7 |
269 |
25.1402 |
|
3 |
1.56 |
19.99 / 1.568 |
16 |
376 |
23.5 |
|
4 |
2.063 |
19.99 / 2.077 |
21.3 |
480 |
22.5352 |
|
5 |
2.593 |
19.99 / 2.613 |
26.7 |
590 |
22.0974 |
|
5.44 |
2.837 |
20 / 2.862 |
29.1 |
638 |
21.9244 |
It shows that the Gain will drift with the input current. I have test by EVM. The IINDPM error is around 60~100mA at different input current. The gain don’t drift.
Could you please provide some suggestions on this problem?
Thanks!
