VN820-B513TR(2003) データシートの表示（PDF） - STMicroelectronics

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VN820-B513TR
(Rev.:2003)

HIGH SIDE DRIVER

STMicroelectronics 

VN820 / VN820SO / VN820SP / VN820-B5 / VN820PT

APPLICATION SCHEMATIC

+5V

+5V

Rprot

STATUS

µC

Rprot

INPUT

VCC

Dld

GND

OUTPUT

VGND

RGND

DGND

GND PROTECTION NETWORK AGAINST

REVERSE BATTERY

Solution 1: Resistor in the ground line (RGND only). This

can be used with any type of load.

The following is an indication on how to dimension the

RGND resistor.

1) RGND ≤ 600mV / (IS(on)max).

2) RGND ≥ (−VCC) / (-IGND)

where -IGND is the DC reverse ground pin current and can

be found in the absolute maximum rating section of the of

the device’s datasheet.

Power Dissipation in RGND (when VCC<0: during reverse

battery situations) is:

PD= (-VCC)2/RGND

This resistor can be shared amongst several different

HSD. Please note that the value of this resistor should be

calculated with formula (1) where IS(on)max becomes the

sum of the maximum on-state currents of the different

devices.

Please note that if the microprocessor ground is not

common with the device ground then the RGND will

produce a shift (IS(on)max * RGND) in the input thresholds

and the status output values. This shift will vary

depending on many devices are ON in the case of several

high side drivers sharing the same RGND.

If the calculated power dissipation leads to a large resistor

or several devices have to share the same resistor then

the ST suggest to utilize Solution 2 (see below).

Solution 2: A diode (DGND) in the ground line.

A resistor (RGND=1kΩ) should be inserted in parallel to

DGND if the device will be driving an inductive load.

This small signal diode can be safely shared amongst

several different HSD. Also in this case, the presence of

the ground network will produce a shift (j600mV) in the

input threshold and the status output values if the

microprocessor ground is not common with the device

ground. This shift will not vary if more than one HSD

shares the same diode/resistor network.

LOAD DUMP PROTECTION

Dld is necessary (Voltage Transient Suppressor) if the

load dump peak voltage exceeds VCC max DC rating. The

same applies if the device will be subject to transients on

the VCC line that are greater than the ones shown in the

ISO T/R 7637/1 table.

µC I/Os PROTECTION:

If a ground protection network is used and negative

transient are present on the VCC line, the control pins will

be pulled negative. ST suggests to insert a resistor (Rprot)

in line to prevent the µC I/Os pins to latch-up.

The value of these resistors is a compromise between the

leakage current of µC and the current required by the

HSD I/Os (Input levels compatibility) with the latch-up limit

of µC I/Os.

-VCCpeak/Ilatchup ≤ Rprot ≤ (VOHµC-VIH-VGND) / IIHmax

Calculation example:

For VCCpeak= - 100V and Ilatchup ≥ 20mA; VOHµC ≥ 4.5V

5kΩ ≤ Rprot ≤ 65kΩ.

Recommended Rprot value is 10kΩ.

9/34

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