Application Circuit (Current sensing) of the TLP7920 Isolation Amplifier

This reference design provides design guide and example of simulation waveform for phase current detection with optical isolation amplifier for motor control of servo and inverter.

Application block diagram of application circuit (current sensing) of the TLP7920 isolation amplifier.
Applicatoin Circuit Diagram of application circuit (current sensing) of the TLP7920 isolation amplifier.


  • Optically coupled isolation amplifier
  • Common mode noise imunity : 15kV/μs(Min)
  • Low comsumption current : Primary side 8.6mA(typ.), Secondary side 6.2mA(typ.)


  • Description of TLP7920 signature functions and features, especially common mode transient immunity, nonlenearity feature and low cosumption current
  • Design guide for the typical application circuit, current sensing circuit
  • Operation confirmation by Spice simulation

Design Documents

Design Documents contain the documents below.

Design Data

Design Data contains the contents listed below.

Used Toshiba Items

Part Number Device Category Portion Usage Description
Photocoupler(Isolation Amplifier) signal amplifier・1 Photocoupler(Isolation Amplifier), Analog output, 5000 Vrms, DIP8

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