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5.3 Circuit with filters
Running a simulation with input filters. A 100mVp-p noise signal (1MHz sine wave) was
superimposed onto Vin1. The added filters were as follows:
Primary-side input line:
Anti-aliasing LPF frequency: 230kHz
LPF resistor: R1＝R2=68Ω
Input bypass capacitor C1 = 0.01μF
Secondary-side output line:
Noise filter frequency: 230kHz
Amplitude adjustment gain: 0 dB
Input series resistors: 10 kΩ
Input bypass capacitors: C4 = C5 =68 pF
Figure 5.5 shows the simulation circuit.
Vin
Figure 5.6 provides the simulation results, which show that the filters removed a noise from the
output waveform. The output is a 10kHz sine wave with 1.64Vp-p, which has x8.2 as large an
amplitude as the input signal (10kHz sine wave) with 0.2Vp-p. This is equal to the specified typical
gain of x8.2 of the TLP7820, indicating that simulation ran properly.
© 2018
Toshiba Electronic Devices & Storage Corporation
Filter
Figure 5.5 Circuit with filters simulated
14 / 19
RD014-RGUIDE-01
Filter
2018-03-15
Vout
Rev. 1
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