|Output Voltage||Single Power Supply|
|IIN MIN||IIN MAX||VIN DIFF, MIN||VIN DIFF, MAX||VOUT DIFF, MIN||VOUT DIFF, MAX||VDD|
|–50 A||50 A||–50 mV||50 mV||-2.05 V||2.05 V||5 V|
This isolated single-supply bidirectional current sensing circuit can accurately measure load currents from –50 A to 50 A. The linear range of the input is from –50 mV to 50 mV with a differential output swing of –2.05 V to 2.05 V and an output common-mode voltage (VCM) of 1.44 V. The gain of the isolated amplifier circuit is fixed at 41 V/V. The design requires 1200-V working voltage to ensure operator safety in a high-voltage application.
DC Transfer Characteristics
The following plots show the simulated DC characteristics of the AMC3302 differential output. The plot shows that the output is linear with a ±50 A input.
Closed Loop AC Simulation Results
The AC sweep shows the AC transfer characteristics of the differential output. Since the AMC3302 has a gain of 41 V/V, the gain of 33.25-dB shown in the following image is expected.
Transient Simulation Results
The following transient simulation shows the output signals of the AMC3302 from –50 A to 50 A. The differential output of the AMC3302 is ±2.05 Vpk-pk as expected.
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Design Featured Isolation Amplifier
340 kHz TYP
Linear input voltage range
Design Alternate Isolation Amplifier
|Working voltage||1200 VRMS|
|Bandwidth||334 kHz TYP|
|Linear input voltage range||±250 mV|