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Silan Microelectroni

Silan Microelectronics Power over Ethernet (POE) circuit SD4954B

SD4954B is a PD and DC/DC controller compatible with IEEE 802.3af standard. The PD controller part of the chip provides detection, classification and surge current limiting functions for the powered equipment in the Power over Ethernet (PoE) system. It integrates a 100V withstand voltage and a 0.6Ω conduction resistance. Power MOSFET with built-in current limiting protection, undervoltage protection and overheating protection. The DC/DC controller part has built-in 200V switching MOSFET, adopts secondary side control (SSR) method, is suitable for Flyback topology and buck topology, provides accurate constant voltage control loop, has high system efficiency and good EMI characteristics.

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Merchant qualification:

angzhou Silan Microelectronics Co., Ltd. is located in Hangzhou High-tech Industrial Development Zone. It is a high-tech enterprise specializing in integrated circuit chip design and production of semiconductor microelectronics related products. The company was established in September 1997 and is headquartered in Hangzhou, China.

Product Introduction&Application Fields

product details

1.PD controller part

  • Complete power interface based on IEEE 802.3af powered devices

  • On-chip 100V, 0.68Ω power MOSFET

  • Under voltage protection

  • Overheating protection

  • 180mA surge current limit

  • 850mA operating current·

  • Automatic retry on failure

2.DC/DC controller part

  • Fixed switching frequency control

  • Built-in error amplifier

  • leading edge blanking

  • Maximum duty cycle limit

  • No load sleep mode

  • soft start

  • Built-in 200V switching MOSFET

  • VCC overvoltage protection

  • VCC undervoltage lockout

  • Over temperature protection

  • Overload protection

  • Cycle-by-cycle throttling

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