Texas Instruments UCC25230 12V to 105V Input, 0.2A Output Switching Converter Evaluation Module UCC25230EVM-662 UCC25230EVM-662 Hoja De Datos
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UCC25230EVM-662
User
'
s Guide
SLUU863
–
February 2012
Biased Half-Bridge Converter with UCC28250
Secondary-Side Control for 48-V Telecom Applications
1
Introduction
This EVM is used to evaluate bias power supply with UCC25230 used in the UCC28250, based on a
secondary-side controlled, half-bridge DC-to-DC converter. The UCC25230EVM-662 is actually a
combination of two released EVMs, UCC28250EVM-564 and UCC25230EVM-754. The
UCC28250EVM-564 is an EVM of secondary-side controlled symmetrical half-bridge DC-to-DC converter.
The UCC25230EVM-754 is used to bias the UCC28250EVM-564 and allow for stand-alone operation in
the UCC28250EVM-564. The targeted application is telecom module design with nominal 48-V input.
UCC28250 is a PWM controller that can be used for primary-side control or secondary-side control. In this
EVM, the UCC28250 is placed at the secondary side to make secondary-side control. The UCC25230 is a
highly integrated PWM controller operating as an isolated Forward-Flyback, or Flybuck
secondary-side controlled, half-bridge DC-to-DC converter. The UCC25230EVM-662 is actually a
combination of two released EVMs, UCC28250EVM-564 and UCC25230EVM-754. The
UCC28250EVM-564 is an EVM of secondary-side controlled symmetrical half-bridge DC-to-DC converter.
The UCC25230EVM-754 is used to bias the UCC28250EVM-564 and allow for stand-alone operation in
the UCC28250EVM-564. The targeted application is telecom module design with nominal 48-V input.
UCC28250 is a PWM controller that can be used for primary-side control or secondary-side control. In this
EVM, the UCC28250 is placed at the secondary side to make secondary-side control. The UCC25230 is a
highly integrated PWM controller operating as an isolated Forward-Flyback, or Flybuck
™
controller. It has
integrated high-side and low-side power switches and a control circuit with all the key converter functions
included.
included.
2
Description
The EVM is a 100-W symmetrical half-bridge DC-to-DC converter that converts 36 V to 72 V DC to a
regulated output voltage of 3.3 V and a maximum of 30-A load current. The EVM is designed in
stand-alone operation without additional external auxiliary power sources.
regulated output voltage of 3.3 V and a maximum of 30-A load current. The EVM is designed in
stand-alone operation without additional external auxiliary power sources.
2.1
Typical Applications
•
48-V Telecom Modular Applications With Secondary-Side Control
•
Server Systems
•
Datacom
•
DSP
’
s, ASIC
’
s, and FPGA
’
s
2.2
Features
•
Start Up Directly from Telecom Input Voltage 36 V to 72 V DC
•
Regulated Output Voltage 3.3 V (with maximum 30-A load current)
•
Smooth and Monotonic Output Voltage Turn On (with Up to 90% pre-biased output voltage)
•
Output Voltage Regulation (from no load to full load, and from low line to high line)
•
Primary-Side Enable ON/OFF Function and Manual Switch for Line-Under Voltage On or Off
•
Secondary-Side Control
•
Control-Driven Synchronous Rectifier
•
Non-Latching Output Over-Voltage Protection and Hiccup Over-Current Protection
•
Telecom Isolation from Primary-to-Secondary 1500 V
DC
•
Test Points to Facilitate the Device Evaluation
2
Biased Half-Bridge Converter with UCC28250 Secondary-Side Control for 48-V
SLUU863
–
February 2012
Telecom Applications
Copyright
©
2012, Texas Instruments Incorporated