Chipown AC/DC Converter Selection Guide
This technical reference document provides detailed information about chipown product specifications, characteristics, and performance parameters. Use this information to support your design and analysis activities.
Electrical characteristics are specified over the operating temperature range unless otherwise noted. Parameters are guaranteed by design, testing, or statistical analysis. Typical values is the most likely parametric norm at 25°C.
Thermal characteristics require careful attention during system design. The junction-to-ambient thermal resistance depends on the mounting configuration, PCB copper area, and airflow conditions. Use thermal simulation tools to predict operating temperatures under actual conditions.
Reliability data is based on accelerated life testing and field failure analysis. Mean time between failures (MTBF) calculations follow industry-standard methodologies. Contact BeiLuo for detailed reliability reports and qualification data.
💡 FAE Insights
📋 Customer Cases
Power Supply Manufacturer
Power Supplies
Challenge
Needed to select AC/DC converter for new 24W adapter design with strict efficiency requirements
Solution
Used this selection guide to evaluate options and selected PN8148 with PN8307 SR controller
Customer Feedback
"Customer reported significant performance improvement and design optimization."
Results
The guide helped us quickly identify the right solution. We achieved 89% efficiency and passed all certifications on the first attempt.
Frequently Asked Questions
1. What is the main difference between PN8147 and PN8148?
PN8148 has a higher current rating MOSFET (4A vs 3A), allowing up to 36W output compared to 24W for PN8147. Both share the same control features and pinout. For detailed specifications and application support on chipown products, refer to the datasheet or contact our team.
2. When should I use synchronous rectification?
Use SR for output voltages below 12V where diode losses are significant. The efficiency improvement is most noticeable at 5V output (3-5% improvement). For detailed specifications and application support on chipown products, refer to the datasheet or contact our team.
3. What transformer core size do I need?
General guidelines: EE16 for <15W, EE19 for 15-25W, EE22 for 25-40W, RM8/RM10 for higher power or high-density designs. For detailed specifications and application support on chipown products, refer to the datasheet or contact our team.
4. How do I calculate the transformer turns ratio?
N = (VIN_min × D_max) / (VOUT + VF), where D_max is typically 0.45-0.5 for flyback converters. Add margin for voltage drops and regulation. For detailed specifications and application support on chipown products, refer to the datasheet or contact our team.
5. What is the maximum switching frequency?
Chipown AC/DC converters typically operate at 65kHz with frequency dithering. This provides a good balance of efficiency, EMI, and component size. For detailed specifications and application support on chipown products, refer to the datasheet or contact our team.