Datasheet

EMI -
filtering
DualPhase
boostPFC
(UCC28061)
LLCresonant
DC/DCconverter
(UCC25600)
Standby&
auxiliarysupply
UCC28600
TIClassD
2x300W@4 W
TAS5630
+15V,200mA
-15V,200mA
Externalusee.g.
pre -amp
PowerControlUnit
Clipdetectfrom TAS5630
“DC” Powerlimit
Thermalwarning
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Overall System Description
4 Overall System Description
4.1 System Block Diagram
Figure 1. System Block Diagram
The system incorporates 3 power converters:
1. PFC Boost front end based on the UCC28061. This converter is a dual interleaved boost converter
operating in the Boundary Conduction Mode.
2. A DC/DC converter for the main power based on the UCC25600. This is a LLC-resonant half bridge
converter capable of both zero-current and zero-voltage switching.
3. An auxiliary converter with low power stand-by functionality based on the UCC28600. The converter
supplies both the primary side circuits as well as the amplifier module and furthermore, the ±15V
supply is made available for powering any preamp or other surrounding circuits supporting the audio
power system.
The basic functionalities of the system is:
1. Overcurrent protection 15 V and 50 V outputs)
2. Overtemperature indication (open collector output)
3. Automatic standby mode
4. Switchable output voltage (50V/25V the output voltage setting is controlled by the clip-detect pin)
7
SLOU293CJune 2010Revised September 2012 A 600-W, Isolated PFC Power Supply for AVR Amplifiers Based on the
TAS5630 and TAS5631
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