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UM1693 Folha de dados(PDF) 21 Page - STMicroelectronics

Nome de Peças UM1693
Descrição Electrónicos  M0-7 standard high-side drivers hardware design guide
PDF  196 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM1693 Folha de dados(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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