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UM1693 bảng dữ liệu(PDF) 21 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  M0-7 standard high-side drivers hardware design guide
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UM1693 bảng dữ liệu(HTML) 21 Page - STMicroelectronics

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UM1693
Reverse battery protection
195
Dimensioning of the GND resistor
The GND resistor is recommended in case of a high inductive load. To determine if the
resistor is needed or not, we need to know the demagnetization time (TDEMAG). The resistor
is recommended if TDEMAG is higher than the standby delay time (tD_STBY).
A typical tD_STBY value of 350 µs is considered in this comparison.
TDEMAG can be determined by either measurement (Figure 6, RGND = 4.7 kΩ, Load: Relay
270 mH/ 90
Ω alternatively Bulb on a typical wire harness with 6 µH stray inductance) or
calculation, using Equation 1 and Equation 2.
Figure 4. Negative GND shift (TDEMAG > tD_STBY)
Equation 1
Equation 2
V
DEMAG
V
BAT
V
CLAMP
–
=
T
DEMAG
L
R
----
ln
V
DEMAG
I
0 R
⋅
+
V
DEMAG
-----------------------------------------------



⋅
=



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