Datasheet

Description

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2 Description

The UCD3138LLCEVM-028 along with the UCD3138CC64EVM-030 demonstrates an LLC resonant half-

bridge DC-DC power converter with digital control using the UCD3138 device. The UCD3138 device is

located on the UCD3138CC64EVM-030 board. The UCD3138CC64EVM-030 is a daughter card with

preloaded firmware that provides the required control functions for an LLC converter. For details of the

firmware please contact TI. UCD3138LLCEVM-028 accepts a DC input from 350 V

to 400 V

, and

outputs a nominal 12 V

with full load output power of 340 W, or full output current of 29 A.

NOTE: This EVM does not have an input fuse and relies on the input current limit from the input

voltage source used.

2.1 Typical Applications

• Offline DC-to-DC Power Conversion

• Servers

• Telecommunication Systems

2.2 Features

• Digitally Controlled LLC Resonant Half-Bridge DC-to-DC Power Conversion

• DC Input from 350 V

to 400 V

• 12 V

Regulated Output from No Load to Full Load

• Full-Load Power 340 W, or Full-Load Current 29 A

• High Efficiency

• Constant Soft-Start Time

• Protection: Over Voltage, Over Current, Brownout and Output Short-Circuit Protection

• Test Points to Facilitate Device and Topology Evaluation

• Synchronous Rectification

• Automatic Mode Switching between LLC Mode and PWM Mode

• Cycle-by-Cycle Current Limiting with Duty Cycle Matching

• Constant Current and Constant Power Control Mode

• PMBUS Communication

• Current Sharing Capability (GUI Enable), Across Paralleled Units

Digitally Controlled LLC Resonant Half-Bridge DC-DC Converter SLUU979A–August 2012–Revised July 2013

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