米6体育平台手机版

TIDT328 april 2023

1
Description
Features
Applications
1Test Prerequisites
2Testing and Results
3Waveforms
A Modulating the Output Voltage
1. A.1 Revision B
  1. A.1.1 Bode Plot
  2. A.1.2 Simulation
  3. A.1.3 Measured Waveforms
    1. A.1.3.1 Sinus 40 Hz
    2. A.1.3.2 Sinus 100 Hz
    3. A.1.3.3 Sawtooth 1
    4. A.1.3.4 Sawtooth 2
    5. A.1.3.5 Pure Triangle
    6. A.1.3.6 Conclusion
2. A.2 Revision C
  1. A.2.1 Bode Plot
  2. A.2.2 Measured Waveforms
    1. A.2.2.1 Sinus 120 Hz
    2. A.2.2.2 Sawtooth 1
    3. A.2.2.3 Sawtooth 2
    4. A.2.2.4 Pure Triangle
  3. A.2.3 Analysis Capacitor 1 µF, 100 V, X7R, 1206
    1. A.2.3.1 DC-Bias
    2. A.2.3.2 Resistance (ESR)
    3. A.2.3.3 Reactance
    4. A.2.3.4 Impedance

A.2.2.1 Sinus 120 Hz

10 V / div

2 ms / div

full bandwidth

Figure 4-9 Modulation Sinusoidal (5 V_PP + 2.5 V) 120 Hz, 12 V_IN, 200-Ω Load

Modulation set to 120 Hz, sinusoidal output voltage looks promising, but the output ripple voltage is increased by lowering output impedance.

Ripple reduction – instead of using a single output capacitor 2.2 µF,100 V, X7R, 1210, a small improvement can be achieved by using several smaller capacitors in parallel ⇒ 3 × 1 µF, 100 V, X7R, 1206, that is, Murata GCJ31CR72A105KA01.