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TLE7184F Datasheet, PDF (15/35 Pages) Infineon Technologies AG – System IC for B6 motor drives
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TLE7184F
Shunt Signal Conditioning
6
Shunt Signal Conditioning
The TLE7184F incorporates a fast and precise operational amplifier for conditioning and amplification of the
current sense shunt signal. The gain of the OpAmp is adjustable by external resistors within a range higher than 5.
The usage of higher gains in the application might be limited by required settling time and band width.
It is recommended to apply a small offset to the OpAmp, to avoid operation in the lower rail at low currents.
The output of the OpAmp ISO is not short-circuit proof.
In addition to the integrated operational amplifier, the TLE7184F incorporates a comparator to detect over current
situations. The output voltage VISO is compared to a reference voltage VOCTH close to the upper rail of the 5V
OpAmp supply (VDD). If VISO reaches this level an error is set.
V DD
Rshunt
RS1
RS2
Rfb3
external
Rfb2
ISP
ISN
VDD
ASIC
+
internal
ISO
-
ERR
+
- VOCTH
Rfb1
Figure 4 Shunt Signal Conditioning Block Diagram and Over Current Limitation
Over current shut down see Chapter 9.2.13.
6.1
Electrical Characteristics
Electrical Characteristics - Current sense signal conditioning
VS = 6.0 to 33 V, Tj = -40 °C to +150 °C, gain = 5 to 75, all voltages with respect to ground, positive current flowing
into pin (unless otherwise specified)1)
Pos. Parameter
Symbol
Limit Values
Unit Conditions
Min. Typ. Max.
6.1.1 Series resistors
RS
100 500 1000 Ω
–
6.1.2 Feedback resistor
Rfb
2000 7500 –
Limited by the output voltage
Ω
–
dynamic range
6.1.3
6.1.4
Resistor ratio (gain ratio)
Steady state differential input
voltage range across VIN
Rfb/RS
5
–
VIN(ss) -400 –
–
–
–
400 mV –
6.1.5
6.1.6
6.1.7
Input differential voltage (ISP - ISN) VIDR
Input voltage (Both Inputs - GND) VLL
(ISP - GND) or (ISN -GND)
Input offset voltage of the I-DC link VIO
OpAmp, including temperature drift
-800 –
-800 –
–
–
800 mV –
2000 mV –
+/-2 mV RS=500Ω; VCM=0V;
VISO=1.65V;
Data Sheet
15
Rev. 1.0, 2008-12-04
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