Texas Instruments UCC28060EVM User Manual
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 V
Throughout this document, the acronym EVM and the phrases evaluation board and evaluation module
are synonymous with the UCC28060EVM.
1 Description
The pre-regulator uses the UCC28060 PFC interleaved controller to shape the input current wave to
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 Thermal Requirements
This evaluation module will operate up to 300 W without external cooling in ambient tempatures of 25 ° C.
to 265 V
RMS
and provides power-factor correction.
RMS
3 Electrical Characteristics
Table 1 summarizes the electrical specifications of the UCC28060EVM.
Table 1. UCC28060EVM Electrical Specifications
PARAMETER CONDITIONS UNITS
RMS input voltage (ac line) 85 265 V
Output voltage, V
Line frequency 47 63 Hz
Power factor (PF) at maximum load 0.9
Output power 300 W
Full load efficiency
OUT
AC line = 115 V 94%
AC line = 230 V 97%
MIN TYP MAX
UCC28060EVM
RMS
390 V
Natural Interleaving is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
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Schematics
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4 Schematics
Figure 1 and Figure 2 show the schematics for this EVM. See the List of Materials for specific values.
To evaluate inductor ripple currents, Jumpers JP8 and JP9 can be removed and replaced with current
loops.
Figure 1. Interleaved PFC Power Stage
2 UCC28060EVM 300-W Interleaved PFC Pre-Regulator SLUU280B – May 2007 – Revised July 2008
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Schematics
Figure 2. Controller Circuitry
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Isolation Transformer
0 to 300W Load
VM
+
13V Bias Supply
Test Setup and Power-Up/Power-Down Instructions
5 Test Setup and Power-Up/Power-Down Instructions
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
output voltage is above 50-V dc. Refer to Figure 3 for a recommended test setup diagram.
There are very high voltages on the board. Components can and will reach
temperatures greater than 100 ° C. Use caution when handling the EVM.
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WARNING
CAUTION
UCC28060EVM 300-W Interleaved PFC Pre-Regulator4 SLUU280B – May 2007 – Revised July 2008
Figure 3. Test Setup
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Efficiency
90.0%
91.0%
92.0%
93.0%
94.0%
95.0%
96.0%
97.0%
98.0%
99.0%
100.0%
10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
% Output Powe r
Efficiency (%)
Efficency at Vin 85V RMS
Efficency at Vin = 265V RMS
Efficiency at Vi n = 115V RMS
91.0%
92.0%
93.0%
94.0%
95.0%
96.0%
97.0%
98.0%
10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
% Output Powe r
Efficiency (%)
With Phase Manage ment
Without Phas e Manage ment
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6 Typical Performance Data
Figure 4 through Figure 7 present characteristic performance data for the UCC28060EVM.
Typical Performance Data
Figure 4. Efficiency at 85V
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 V
RMS
and 230 V
efficiency up to 3%. Refer to the UCC28060 data sheet for details on how to use the phase management
function of this device.
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Figure 5. Efficiency at 115 V
and 265V
RMS
input voltages. Phase management improved the light load
RMS
, With and Without Phase Management
RMS
RMS
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