Description

This reference design implements a Power-over-Ethernet (PoE) power device (PD) active-clamp forward converter with 24V and 3A output. A TPS23730 PD with integrated pulse-width modulator (PWM) controller provides all the necessary functions to implement the PoE PD control and the PWM control for the active-clamp forward converter. This design uses secondary-side regulation (SSR) with an optocoupler feedback. An external hot swap is added to enable Class-7,8 PD applications. INA237 is used on the primary side to monitor the DC/DC input voltage and current, and the power information is sent to the secondary side by either I2C isolator or optocoupler-based circuits.