VND5E008MY-E Datasheet, PDF (22/35 Pages) STMicroelectronics – Double channel high-side driver with analog current sense for automotive applications

Application information
3
Application information
VND5E008MY-E
Note:
Figure 29. Application schematic
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Channel 2 has the same internal circuit as channel 1.
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3.1
Load dump protection
D_ld is necessary (Voltage Transient Suppressor) if the load dump peak voltage exceeds the
V_CCPK max rating. The same applies if the device is subject to transients on the V_CC line
that are greater than the ones shown in the ISO 7637-2: 2004(E) table.
3.2
MCU I/Os protection
When negative transients are present on the V_CC line, the control pin is pulled negative to
approximately -1.5 V. ST suggests to insert a resistor (R_prot) in line to prevent the
microcontroller I/O pins from latching-up.
The value of these resistors is a compromise between the leakage current of microcontroller
and the current required by the HSD I/Os (input levels compatibility) with the latch-up limit of
microcontroller I/Os.
Equation 1
-V_CCpeak / I_latchup ≤ R_prot ≤ (V_OHμC - V_IH) / I_IHmax
Calculation example:
For V_CCpeak = - 1.5 V; I_latchup ≥ 20 mA; V_OHμC ≥ 4.5 V
75 Ω ≤ R_prot ≤ 240 kΩ.
Recommended values: R_prot =10 kΩ, C_EXT =10 nF.
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