Summary:
The circuit design shown in the figure uses the LNK363DN to generate an isolated output of 5 V, 150 mA. The transformer designed here has sufficient inductance to enable the power supply to provide the required power. Even if someone uses a strong external magnetic field to saturate the core in an attempt to tamper with the meter, the power supply will not be affected.
design feature
- Low cost and low component count
- Enhanced tamper-proof protection with iron powder core material
- Can still work normally under the interference of external magnetic field
- Low working flux density (400 Gauss), reduced core loss (<40 mW)
- High efficiency (up to 58% at full load)
- Efficient use of the available power at the input (the limit of the IEC10362 standard is 2 W,
- 10 VA)
- Fully extend the maintenance time
- The time-consuming electrical energy is stored in the input capacitor
- No need for large output capacitors or a second higher output voltage
- Conforms to EN55022B conducted EMI limits, EMI margin >6 dBmV
See the PDF document for details (click on the PDF file to download)
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