Class 6, PoE PD Active Clamp Forward Converter(15 V, 3.3 A) Reference Design

Description

This reference design implements a Power-over-Ethernet (PoE) power device (PD) active clamp forward converter with 15-V and 3.3-A 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.

Features

IEEE802.3bt Type 3 compliant PoE PD
Integrated PWM controller for flyback or active clamp forward configuration
Frequency dithering for EMI reduction
Soft-start control with advanced start-up and hiccup mode overload protection
Soft-stop shutdown
Optional adapter input

Applications

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1 Test Prerequisites

1.1 Voltage and Current Requirements

Table 1-1 Voltage and Current Requirements

Parameter	Specifications
Input voltage	37 V–57 V (48-V nominal)
Output voltage	15 V
Output current	3.3 A
Nominal switching frequency	250 kHz