Texas Instruments 600W Isolated PFC AVR Power Supply Evaluation Module UCC25600EVM-644 UCC25600EVM-644 数据表
产品代码
UCC25600EVM-644
Clip-Detect
VRail
25 V
50 V
time
Overall System Description
4.4
Standby
The UCC28600 supplies the bias power to the PFC and DC/DC converter. When the power consumption
on the ±15V rails falls below approx. 1.5W, the UCC28600 turns off the bias power to the main power
converters and enters low power/standby mode.
on the ±15V rails falls below approx. 1.5W, the UCC28600 turns off the bias power to the main power
converters and enters low power/standby mode.
During this mode the ±15V is "alive" but the main power rail (50V/25V) is off. When power consumption on
the auxiliary voltages goes up again the main power rail is turned on.
the auxiliary voltages goes up again the main power rail is turned on.
4.5
Switchable Rail Voltage
The power supply rail voltage has 2 different settings which are controlled by the clip-detect pin.
During low power situations where 25V rail voltage is sufficient, the system turns off the PFC converter
and only uses the DC/DC converter.
and only uses the DC/DC converter.
At high line (230VAC) and in this mode, the main DC/DC converter enters a burst mode operation to be
able to regulate the voltage down to 25V. Depending on power level this burst operation produces some
acoustical noise. At low line (110VAC) the DC/DC does not enter the burst mode, and therefore, no
acoustical noise.
able to regulate the voltage down to 25V. Depending on power level this burst operation produces some
acoustical noise. At low line (110VAC) the DC/DC does not enter the burst mode, and therefore, no
acoustical noise.
When the clip-detect is pulled high (12V), the PFC converter starts and the rail voltage is regulated up to
50V. If the clip-detect pin goes low again the rail voltage stays at 50V for a few seconds and then slowly
ramps down to 25V.
50V. If the clip-detect pin goes low again the rail voltage stays at 50V for a few seconds and then slowly
ramps down to 25V.
Figure 2. Correlation Between Rail Voltage and Clip-Detect Signal
9
SLOU293C – June 2010 – Revised September 2012
A 600-W, Isolated PFC Power Supply for AVR Amplifiers Based on the
TAS5630 and TAS5631
Copyright © 2010–2012, Texas Instruments Incorporated