Datasheet

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Description

2.1 Typical Applications

Isolated telecom 48-V input systems requiring high efficiency and high power density for very low output

voltage, high current converter applications, including:

• Server Systems

• Datacom

• Telecom

• DSP’s, ASIC’s, FPGA’s

2.2 Features

• ZVS transformer reset using active clamp technique in forward converter.

• All surface mount components, double sided half brick (2.2” x 2.28” x 0.5”).

• Low-side active clamp with programmable dead time for ZVS.

• Current-Mode Control with bi-directional sync function.

• Internal PWM slope compensation.

• Start up directly from telecom input voltage.

• Synchronous rectifier output stage allows high efficiency operation.

• Programmable soft start.

• Up to 30 A

output current.

• Regulation to zero load current.

• Non-latching, cycle-by-cycle over-current and short circuit protection.

• Non-latching, Input under-voltage protection.

• Non-latching, Input over-voltage protection.

• 1500-V isolation primary to secondary.

SLUU357–November 2009 48-V to 3.3-V Forward Converter with Active Clamp Reset —Using the

UCC2897A Active Clamp Current Mode —PWM Controller

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