65W notebook adapter designed with TOP258EN, with circuit diagram, bill of materials, specification file, printed circuit board layout

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM
Single chip microcomputer STM32L151CCU6
1206RGB (single)
Photocoupler

working principle

Circuit diagram of a flyback notebook adapter power supply designed with Power Integrations® TOPSwitch-HX TOP258EN offline switch IC. The power supply provides 19 V, 65 W output in a universal input range and is capable of operating in a hermetic enclosure with an ambient temperature of up to 40 °C.

design feature

  • Very compact design with few components
  • Internal current limit point reduction eliminates secondary side current limiting circuit
  • Primary side overvoltage protection (OVP) eliminates secondary optocouplers
  • 700 V MOSFET reduces solution cost
  • Replace 100 V, 40 A diodes with low cost (60 V, 20 A) Schottky diodes
  • 132 kHz operating frequency reduces transformer size
  • Low MOSFET capacitance allows operation at higher frequencies without reducing efficiency
  • Extremely energy efficient
  • No-load input power is very low: <200 mW at 265 VAC input
  • High load efficiency: >87%
  • High average efficiency: >86%
  • Excellent transient no-load response
  • Hysteresis overload thermal protection
  • Overload protection provides automatic recovery
  • Latch fault protection

65W notebook adapter PCB physical map

65W notebook adapter circuit diagram

65W notebook adapter PCB layout

65W notebook adapter component list

See the PDF document for details (click on the PDF file to download)

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