SD4950 is an Ethernet powered device and DC/DC controller IC compatible with IEEE 802.3af standard. It provides powered devices (PD) with functions of detection, classification and inrush current limit.
SD4950 integrates a 100V power MOSFET with on-resistance of 0.6Ω, and features built-in current limit, undervoltage protection and over temperature protection.
The DC/DC controller integrates a 150V power MOSFET with PSR control. It is suitable for Flyback topology, providing accurate CV control loop. Working in PWM+PFM, it features high system efficiency and good EMI characteristic.
PD controller
IEEE 802.3af Compliant
100V 0.6Ω On-chip MOSFET
Undervoltage lockout
Over temperature protection
180mA inrush current limit
960mA operating current
Fault automatic retry
DC/DC controller
PSR mode
Light load frequency reduce mode
Leading-Edge Blanking
Peak current mode
Cycle by cycle current limit
Undervoltage lockout
Soft startup
VCC over voltage protection
Short-circuit protection
Over voltage protection
Over current protection
Over temperature protection