Dear Sir,
We are developing a 1.2kW Battery Charger which is based on UC3846 IC, TI make. We are facing problems in this design. We are seeking TI support to resolve the problems.
The detailed Specifications sheet is attached for your reference. For your immediate reference,
- Topology : Half Bridge
- Input Operating Voltage : 180V to 270V AC
- Output Rating : 60A@20A
- Operating frequency : 70kHz
Observations
The following are the few details on the circuit operation,
- The feedback regulation is coming into picture at 200V AC and above. This phenomenon is the same in both No Load and Load conditions.
- It is delivering 80W power at 200V AC and 100W power at 240V AC. If we try to increase the load the unit is going into over power mode.
Please find the attached images of Gate, MOSFET, Secondary waveforms sending for your reference.
PCB schematic and PCB Gerber files are also attached herewith.
Best Regards,
J.V. Siva Rama Rao,
Bhagyashree Industries,
Hyderabad,
India.
