PD70201 Isolated Flyback Converter Evaluation Board

The PD70201 is an integrated Powered Device Interface and PWM controllers for a DC-DC converter used in IEEE802.3af and IEEE802.3at applications. The PD70201 can be used for IEEE802.3af/IEEE802.3at Type 1 applications, and in IEEE802.3at Type 2 applications. A single PD70201 can be used in 4-pair applications which consumes up to 47.7W. This device has a number of features designed to improve efficiency and reliability: Detection and Classification: The front end interface includes detection and classification circuitry. The detection signature resistor is disconnected upon completion of the detection phase. The system then begins the classification phase. Classification can be configured for Classes 0 to 4 via an external resistor.

• IEEE802.3af and IEEE802.3at Compliant
• Less Than 10 µA (typical) Offset Current During Detection
• SignatureResistor is Disconnected upon Detection
• Programmable Classification Setting with a Single Resistor
• Integrated 0.6 Ohm Isolating MOSFET Switch With Inrush Current Limit
• Power Off DC-DC Input Capacitor Discharge
• 100 kHz to 500 kHz Adjustable DC-DC Switching Frequency
• DC-DC Frequency Can Be Synchronized to External Clock
• Supports Low Power Mode Operation for Higher Efficiency 50% Maximum Duty Cycle
• Soft-start Circuit to Control The Output Voltage Rise Time
• Two out-of-phase driver stages for efficient synchronous rectification or active clamp
• PoE Port Input UVLO with Programmable Threshold and Hysteresis
• Internal Differential Amplifier Simplifying Non-isolated Step Down Converter
• Over Load and Short Circuit Protection & Pb-Free