Fairchild FEB107-001 User Manual - page 5
© 2005 Fairchild Semiconductor
Page 5
of 14
Rev 2.0 March 2005
www.fairchildsemi.com
2. Test Procedure
Use the following procedure to safely operate the power supply.
1.
Connect a load (active or resistive) to the output terminals. Set the load to zero amps.
2.
Connect a DC voltmeter across the output terminals.
3.
Connect an isolated variable AC source (such as a Variac) to the AC input connector (Line and
Neutral), with the voltage initially set to zero.
4.
Adjust the AC input voltage within the range of 85 to 265VAC.
5.
The output voltage should read 12VDC ±1%.
6.
Increase the load to 19.5A. The output, as measured at the output terminals, should regulate
within ±0.1% of the nominal reading. The ripple voltage should read less than 30mV RMS.
7.
The input power factor should be greater than 0.95. Efficiency should be greater than 80%.
8.
Reduce the AC input to zero and verify that the output voltage drops to zero.
3. Test Results
3.1 Performance Data
To measure the Evaluation Board performance across the range of permissible input voltages use an isolated
Variac or adjustable AC source. A typical FEB107-001 Evaluation Board will have the performance characteris-
tics shown in Table 1 when operated under the test conditions listed.
Table 1: Performance data
3.2 Power Ratings
The FEB107-001 Evaluation Board is designed to deliver up to 240 Watts at 85VAC when used with a properly
rated and positioned cooling fan. The power rating without a fan is limited to 150 Watts. A 12V fan can be
placed as suggested in Figure 1 and operated from the evaluation board 12V output.
Caution
The FEB107-001 Evaluation Board contains voltage potentials capable of causing serious injur y, and
components which, if failing, may shatter or explode. Please use extreme caution when operating this
board. The use of protective wear is strongly recommended. To safely observe in-circuit waveforms
an isolation transformer should be inserted between the AC line and the Board. Do not operate this
Board with AC voltages outside the design limits. When replacing components on this Evaluation
Board use only those shown in the following parts list.
Input:
85VAC
120VAC
230VAC
265VAC
Units
Efficiency
63
81
68
82
%
P. F.
0.99
0.98
0.96
0.97
n.a.
Power
50
290
50
290
W