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TLE4971 데이터시트(PDF) 6 Page - Infineon Technologies AG

부품명 TLE4971
상세설명  TLE4971 high precision coreless current sensor for automotive applications in 8x8mm SMD package
PDF  23 Pages
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제조업체  INFINEON [Infineon Technologies AG]
홈페이지  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

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Datasheet
6
Revision 1.02
19-08-2022
TLE4971
Datasheet
Functional Output Description
The analog output signal depends on the selected
output mode:
• Single-ended
• Fully-differential
• Semi-differential
Single-Ended Output Mode
In single-ended mode VREF is used as an input pin
to provide the analog reference voltage, VREF. The
voltage on AOUT, VAOUT, is proportional to the
measured current IPN at the current rail:
������������������������������(������������������) = ������������������ + ������ ∙ ������������������
The quiescent voltage VOQ is the value of VAOUT
when IPN=0. VOQ tracks the voltage on VREF
������������������(������������������������) = ������������������������
The reference voltage can be set to different
values which allow either bidirectional or
uniderictional current sensing. The possible values
of VREFNOM are indicated in Table 3.
The sensitivity is by default non ratiometric to VREF.
If ratiometricity is activated the sensitivity
becomes as follows:
������(������������������������) = ������(������������������������������������������) ∙
������������������������
������������������������������������������
Fully-Differential Output Mode
In fully-differential output mode, both VREF and
AOUT are analog outputs to achieve double
voltage swing: AOUT is the non-inverting output,
while VREF is the inverting output:
������������������������������(������������������) = ������������������������������������ + ������ ∙ ������������������
������������������������(������������������) = ������������������������������ − ������ ∙ ������������������
The quiescent voltage is derived from the supply
pins VDD and GND and has the same value on both
AOUT and VREF:
������������������������������������(������������������) = ������������������������������(������������������) =
������������������
2
The sensitivity in the fully-differential mode can be
generally expressed as:
������(������������������)������������������������ = ������(3.3������)������������������������ ∙
������������������
3.3������
In this mode, the quiescent voltages and the
sensitivity are both ratiometric with respect to VDD
if ratiometricity is enabled.
Semi-Differential Output Mode
In semi-differential output mode, the sensor is
using a chip-internal reference voltage to generate
the quiescent voltage that is available on pin VREF
(used as output).
The analog measurement result is available as
single-ended output signal on AOUT. The
dependence of sensitivity and output offset on
reference voltage is the same as described in
single- ended output mode.
The quiescent voltage is programmable at 3
different values, VOQbid_1 and VOQbid_2 for
bidirectional current and VOQuni for unidirectional
current (see Table 5).



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