User's Guide
SLUU280B–May 2007–Revised July 2008
UCC28060EVM 300-W Interleaved PFC Pre-Regulator
The UCC28060 is a dual-phase, transition-mode Power Factor Correction (PFC) pre-regulator. The
UCC28060EVM is an evaluation module (EVM) with a 390-V, 300-W, dc output that operates from a
universal input of 85 VRMS to 265 VRMS and provides power-factor correction.
Throughout this document, the acronym EVM and the phrases evaluation board and evaluation module
are synonymous with the UCC28060EVM.
1
Description
provide power-factor correction. This device uses TI’s Natural Interleaving™ technology to interleave
boost phases.
This user’s guide provides the schematic, List of Materials list, assembly drawing for a single-sided printed
circuit board application, and test set-up information necessary to evaluate the UCC28060 in a typical
PFC application.
2
3
Thermal Requirements
This evaluation module will operate up to 300 W without external cooling in ambient tempatures of 25°C.
Electrical Characteristics
Table 1. UCC28060EVM Electrical Specifications
UCC28060EVM
PARAMETER
CONDITIONS
UNITS
MIN
TYP
MAX
RMS input voltage (ac line)
Output voltage, VOUT
Line frequency
85
265
63
VRMS
V
390
47
Hz
Power factor (PF) at maximum load
Output power
0.9
300
W
AC line = 115 V
AC line = 230 V
94%
97%
Full load efficiency
Natural Interleaving is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
SLUU280B–May 2007–Revised July 2008
UCC28060EVM 300-W Interleaved PFC Pre-Regulator
1
Submit Documentation Feedback
Schematics
+
Figure 2. Controller Circuitry
SLUU280B–May 2007–Revised July 2008
UCC28060EVM 300-W Interleaved PFC Pre-Regulator
3
Submit Documentation Feedback
Test Setup and Power-Up/Power-Down Instructions
5
Test Setup and Power-Up/Power-Down Instructions
WARNING
There are high voltages present on the pre-regulator. It should only
be handled by experienced power supply professionals. To
evaluate this board as safely as possible, the following test
configuration should be used:
• Connect an isolation transformer between the source and unit
• Attach a voltmeter and a resistive or electronic load to the unit
output before supplying power to the EVM.
A separate 13-V bias supply is required to power the UCC28060 control circuitry. The unit will start up
under no-load conditions. However, for safety, a load should be connected to the output of the device
before it is powered up. The unit should also never be handled while power is applied to it or when the
CAUTION
There are very high voltages on the board. Components can and will reach
temperatures greater than 100°C. Use caution when handling the EVM.
VM
0 to 300W Load
+
Isolation Transformer
13V Bias Supply
Figure 3. Test Setup
4
UCC28060EVM 300-W Interleaved PFC Pre-Regulator
SLUU280B–May 2007–Revised July 2008
Submit Documentation Feedback
Typical Performance Data
6
Typical Performance Data
Efficiency
100.0%
99.0%
98.0%
97.0%
96.0%
95.0%
94.0%
93.0%
92.0%
91.0%
90.0%
Efficency at Vin 85V RMS
Efficency at Vin = 265V RMS
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
% Output Power
Figure 4. Efficiency at 85VRMS and 265VRMS
The UCC28060 control device has phase management capability to improve light load efficiency. To
demonstrate the light load efficiency, the unit efficiency was measured with phase management enabled
and disabled at 115 VRMS and 230 VRMS input voltages. Phase management improved the light load
efficiency up to 3%. Refer to the UCC28060 data sheet for details on how to use the phase management
function of this device.
Efficiency at Vin = 115V RMS
98.0%
97.0%
96.0%
95.0%
94.0%
93.0%
With Phase Management
92.0%
Without Phase Management
91.0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
% Output Power
Figure 5. Efficiency at 115 VRMS, With and Without Phase Management
SLUU280B–May 2007–Revised July 2008
UCC28060EVM 300-W Interleaved PFC Pre-Regulator
5
Submit Documentation Feedback
|