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UM1556 Datasheet(PDF) 30 Page - STMicroelectronics

Part # UM1556
Description  VIPower M0-5 and M0-5Enhanced
PDF  87 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM1556 Datasheet(HTML) 30 Page - STMicroelectronics

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Analogue current sense
UM1556
30/87
Doc ID 023520 Rev 2
Figure 29.
Switchable current sense resistor – example
2.7.3
K-factor calibration method
In order to reduce the VSENSE spread, it is possible to reduce the K spread and eliminate the
RSENSE variation by adding a simple test (calibration test) at the end of the module
production line.
How the calibration works
“To calibrate” on a specific device soldered in a module signifies measuring the K ratio at a
given output current by a VSENSE reading. Since the relation of IOUT =ISENSE × K is known,
it is straightforward to calculate the K ratio. However, even if the K ratio measured at a single
point eliminates the parametric spread, it doesn't eliminate the VSENSE variation due to the K
variation produced by the output current variation.
This variation can be eliminated given the following considerations:
Table 7 and Figure 30 show a VSENSE measurement in a random VND5E025AK with
RSENSE =1.8 kΩ.
Table 7.
VSENSE measurement
IOUT[A]
VSENSE[V]
10.64
21.29
31.99
42.69
53.39



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