TLI4971
high precision coreless current sensor for industrial
applications in 8x8mm SMD package
Description
TLI4971 is a high precision miniature coreless
magnetic current sensor for AC and DC
measurements with analog interface and two fast
over-current detection outputs.
Infineon's well-established and robust monolithic
Hall technology enables accurate and highly linear
measurement of currents with a full scale up to
±120A. All negative effects (saturation, hysteresis)
commonly known from open loop sensors using
flux concentration techniques are avoided. The
sensor is equipped with internal self-diagnostic
feature.
Typical applications are electrical drives and
general purpose inverters.
The differential measurement principle allows
great stray field suppression for operation in harsh
environments.
Two separate interface pins (OCD) provide a fast
output signal in case a current exceeds a pre-set
threshold.
The sensor is shipped as a fully calibrated product
without requiring any customer end-of-line
calibration.
All user-programmable parameters such as OCD
thresholds, blanking times and output configuration
modes are stored in an embedded EEPROM
memory.
Features & Benefits
Integrated current rail with typical 220µΩ insertion
resistance enables ultra-low power loss
Less than 1nH parasitic inductance of integrated
current rail enables wide bandgap design
Bandwidth of 240kHz enables wide range of
applications
8x8mm form factor
Very low sensitivity error over temperature
Galvanic functional isolation up to 1150V
V
ISO
3500V RMS agency type-tested for 60 seconds
per UL1577
Differential sensing principle
Two independent ultrafast Over Current Detection
outputs
s
Coreless current sensor in PG-TISON-8 package
Order Information
Product Name
TLI4971-A120T5-U-E0001
TLI4971-A120T5-E0001
TLI4971-A075T5-U-E0001
TLI4971-A075T5-E0001
TLI4971-A050T5-U-E0001
TLI4971-A050T5-E0001
TLI4971-A025T5-U-E0001
TLI4971-A025T5-E0001
Product Type
120A measurement range, UL
certified device
1)2)
120A measurement range
1)2)
75A measurement range, UL
certified device
1)2)
75A measurement range
1)2)
50A measurement range, UL
certified device
1)2)
50A measurement range
1)2)
25A measurement range, UL
certified device
1)2)
25A measurement range
1)2)
Marking
H71I1A1UH
H71I1A1_H
H71I3A1UH
H71I3A1_H
H71I4A1UH
H71I4A1_H
H71I6A1UH
H71I6A1_H
Ordering Code
SP005272936
SP005344532
SP005446655
SP005446653
SP005446651
SP005446648
SP005446646
SP005446644
Package
PG-TISON-8
PG-TISON-8
PG-TISON-8
PG-TISON-8
PG-TISON-8
PG-TISON-8
PG-TISON-8
PG-TISON-8
1) Current sensor for industrial / consumer applications, qualified according to AEC Q100 grade 2
2) Semi-differential mode, non-ratiometric output sensitivity
Datasheet
www.infineon.com
Please read the Important Notice and Warnings at the end of this document
Rev. 1.30
01-12-2021
TLI4971
Datasheet
Pin Configuration
Pin configuration
I
PN
Pin No.
1
2
-
7
6
+
8
3 2
5 4
1
Symbol
VDD
GND
VREF
AOUT
OCD1
Function
Supply voltage
Ground
Reference voltage input or
output
Analog signal output
Over-current detection
output 1 (open drain
output)
Over-current detection
output 2 (open drain
output)
Negative current terminal
pin (current-out)
Positive current terminal
pin (current-in)
3
4
5
Figure 1 Pin layout PG-TISON-8-5
The current I
PN
is measured as a positive value
when it flows from pin 8 (+) to pin 7 (-) through the
integrated current rail.
6
7
8
OCD2
IP-
IP+
Target Applications
The TLI4971 is suitable for AC as well as DC current measurement applications:
Electrical drives
General purpose inverters
PV inverters
Chargers
Current monitoring
Overload and over-current detection
Due to its implemented magnetic interference suppression, it is extremely robust when exposed to external
magnetic fields. The device is suitable for fast over-current detection with a configurable threshold level.
This allows the control unit to switch off and protect the affected system from damage, independently from
the main measurement path.
Datasheet
2
Rev. 1.30
01-12-2021
TLI4971
Datasheet
General Description
The current flowing through the current rail on the primary side induces a magnetic field that is differentially
measured by two Hall probes. The differential measurement principle of the magnetic field combined with
the current rail design provides superior suppression of any ambient magnetic stray fields. A high
performance amplifier combines the signal resulting from the differential field and the internal compensation
information provided by the temperature and stress compensation unit. Finally the amplifier output signal is
fed into a differential output amplifier which is able to drive the analog output of the sensor.
Depending on the selected programming option, the analog output signal can be provided either as:
Single-ended
Fully-differential
Semi-differential
In single-ended mode, the pin VREF is used as a reference voltage input. The analog output signal is provided
on pin AOUT. In fully-differential mode, both AOUT (positive polarity) and VREF (negative polarity) are used
as signal outputs whereas VDD is used as reference voltage input. Compared to the single-ended mode, the
fully-differential mode enables doubling of the output voltage swing.
In semi-differential mode a chip-internal reference voltage is used and provided on VREF (output). The
current sensing information is provided in a single-ended way on AOUT.
For fast over-current detection, the raw analog signal provided by the Hall probes is fed into comparators
with programmable switching thresholds.
A user-programmable deglitch filter is implemented to enable the suppression of fast switching transients.
The open-drain outputs of the OCD pins are active “low” and they can be directly combined into a wired-AND
configuration on board level to have a general over-current detection signal.
All user-programmable parameters such as OCD thresholds, deglitching filter settings and output
configuration mode are stored in an embedded EEPROM memory.
Programming of the memory can be performed in the application through a Serial Inspection and
Configuration Interface (SICI). The interface is described in detail in the programming guide which can be
found on the Infineon website. Please contact your local Infineon sales office for further documentation.
Standard Product Configuration
The pre-configured full scale range is either set to ±120A, ±75A, ±50A or ±25A depending on the choosen
product variant.
The pre-configured output mode is set to semi-differential mode.
The quiescent voltage is set to 1.65V.
The OCD threshold of channel 1 is set to the factor 1.25 of the full scale range.
The OCD threshold of channel 2 is set to the factor 0.82 of the full scale range.
The pre-defined setting of the OCD deglitching filter time is set to 0µs.
The sensor is pre-configured to work in the non-ratiometric mode.
The sensitivity and the derived measurement range (full scale) can be reprogrammed by user according
to the sensitivity ranges listed in Table 4.
The sensor can be reprogrammed into single-ended operating mode or fully-differential mode by user
without any recalibration of the device.
The OCD thresholds and filter settings can be reprogrammed by the user according to the values listed in
Table 6 and Table 7.
For semi-differential uni-directional mode or ratiometric output sensitivity, please contact your local
Infineon sales office.
Datasheet
3
Rev. 1.30
01-12-2021
TLI4971
Datasheet
Block Diagram
The current flowing through the current rail on the primary side induces a magnetic field, which is measured
by two Hall probes differentially. The differential measurement principle provides superior suppression of any
ambient magnetic stray fields. A high performance amplifier combines the signal resulting from the differential
field and the compensation information, provided by the temperature and stress compensation unit. Finally
the amplifier output signal is fed into a differential output amplifier, which is able to drive the analog output
of the sensor.
IP+
Integrated
current rail
Infrastructure
(power, clk, references)
VDD
GND
Bias signal f or
Diagnosis Mode
EEPROM
Referen ces
OCD1
OCD2
AOUT
Differential
Hall plate
Diff.
Hall
Signal
Cond itioning
VREF
Temp
MUX
Stress
Output
Offset
IP-
Figure 2 Block Diagram
Datasheet
4
Rev. 1.30
01-12-2021
TLI4971
Datasheet
Absolute Maximum Ratings
Table 1 Absolute Maximum Ratings
General conditions (unless otherwise specified): V
DD
= 3.3V; T
S
= -40°C … +105°C
Note /
Parameter
Symbol Min Typ
Max
Unit
Test Condition
Supply voltage
V
DD
-0.3
3.3
3.6
V
Primary nominal rated
current LF
1)
Primary nominal rated
current HF
1)
Primary current
Voltage on interface pins
VREF, OCD1, AOUT
Voltage on Interface pin
OCD2
ESD voltage
2)
ESD voltage
3)
Voltage slew-rate on
current rail
Maximum junction
temperature
Storage temperature
Life time
1)
2)
3)
I
PNRLF
I
PNRHF
I
PNS
V
IO
V
IO_OCD2
V
ESD_HBM
V
ESD_SYS
ΔV/dt
T
j_max
T
A_STORE
LT
-70
-70
-250
-0.3
-0.3
-2
-16
-
-
-40
15
-
-
-
-
-
-
-
-
-
-
-
70
70
250
V
DD
+ 0.3
21
2
16
10
130
130
-
A
A
A
V
V
kV
kV
V/ns
°C
°C
Peak, frequency < 10Hz
RMS, frequency ≥ 10Hz
Single peak for 10µs,
10 assertions per lifetime
In the application circuit
Full voltage range
Considering continuous
Years operation with T
S
= 70°C
and I = 30 A
RMS
Tested with primary nominal rated current of 70A peak on Infineon reference PCB at Low Frequency (LF).
Thermal equilibrium reached after 2 min.
Human Body Model (HBM), according to standard AEC-Q 100-002
According to standard IEC 61000−4−2 electrostatic discharge immunity test
Stress above the limit values listed here may cause permanent damage to the device. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability. Maximum ratings are absolute
ratings. Exceeding only one of these values may cause irreversible damage to the integrated circuit.
Datasheet
5
Rev. 1.30
01-12-2021
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