SBAA783 January   2026 ISOM8600 , ISOM8610

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Digital Output in PLC/DCS, Motor Drives and Robotics
    1. 1.1 Sink and Source Outputs: Supports Bidirectional Operation
    2. 1.2 PLC/DCS
    3. 1.3 Motor Drives
    4. 1.4 Robotics
  5. 2Design Procedures for Driving a Relay (Inductive Load)
    1. 2.1 Introduction to a Mechanical Relay
    2. 2.2 ISOM8600 Design Example
    3. 2.3 Test Results based on ISOM8600 and relay
      1. 2.3.1 Test 1: No Protection
      2. 2.3.2 Test 2: Capacitive Filter
      3. 2.3.3 Test 3: Zener Active Clamping Diode
  6. 3ISOM86x0 Advantages
    1. 3.1 Isolation Technology
    2. 3.2 Opto-Emulator Signal Chain
  7. 4Summary
  8. 5References

2.3.2 Test 2: Capacitive Filter

The second test utilizes a 1μF capacitor to filter out the transient. The capacitive filter (Figure 2-3) succeeds in lowering the high level of the transient, however, the time that the transient is above 40V extended from 4ms to 10ms. The capacitive filter increases the duration of the transient and does not actively clamp the pulse. This may not be possible for certain applications.

Test Circuit 2 – Capacitive Filter Figure 2-3 Test Circuit 2 – Capacitive Filter
Back EMF for Circuit 2 Figure 2-4 Back EMF for Circuit 2