AND8019 Datasheet, PDF (2/12 Pages) ON Semiconductor – Offline Converter Provides 5.0 Volt, 1.0 Amp Output for Small Electronic Equipment

AND8019/D
Manufacturers Contact Data
Mfr.
Phone
Web
ON Semiconductor 800 282–9855 www.onsemi.com
Cooper Electronics 561 752–5000 www.cooperet.com
TDK
847 803–6100 www.component.tdk.com
Mallory
317 273–0090 www.nacc–doesit.com
Vishay/...
818 781–1642 www.vishay.com/index.html
Lumex
847 359–2790 www.lumex.com
Beau Interconnect 603 524–5101 www.beauint.com
Panasonic
–
www.panasonic.com
Board Evaluation
The following Power Supply Test Setup diagram and
description is designed to allow the board to be tested for all
parameters listed in the Converter Test Data table. This may
be used to confirm proper operation of the board, as well as
operating parameters of modified boards.
Scope
1A
500 mA
85 vac–265 vac
50 Hz–60 Hz
V
90 mA
Volt
or
Watt
Meter
UUT
55 W
12 W
10 W
Load Fixture
Figure 1. Power Supply Test Setup
Test Setup
The input power source needs to be variable over the range
of voltages and frequencies that you choose to test. This can
be either a variac or an electronic power source.
Connect it to a voltmeter or wattmeter. A wattmeter will be
required to measure efficiency. If none is available, use a
voltmeter. The output of the meter will be fed into the input
connector on the board. The polarity is not important as this
converter has an isolated output. Please keep in mind that the
input side of this circuit is hot – including the ground.
The output connector should be connected to an ammeter
in the high line, and then to a set of load resistors. The 12 W
and 10 W resistors should be rated at 10 watts, and the 55 W
at 2.0 watts.
Any lab scope with at least a 20 MHz bandwidth will be
adequate to observe ripple and switching waveforms.
The unit will not be damaged by input voltages below
85 volts, but may not operate properly. Do not exceed the
265 volt rating as this could damage the NCP1000 as well as
other components.
Measurement Techniques
To accurately measure the output voltage and ripple, the
voltmeter and oscilloscope probes should be connected as
close as possible to the output terminals of the board.
Measuring the output voltage at the load resistors will result
in errors due to the impedance of the ammeter and of the lead
wires.
Ripple measurements often contain large amounts of
common mode noise. Before taking measurements, connect
the scope probe to the ground lead at the negative output
terminal. Any spikes that are on the screen of the scope are
common mode noise that is being picked up by the scope
leads, and are not part of the output ripple. This phenomenon
may be reduced by using two scope probes in a differential
measurement mode.
Connect both ground leads to the negative output
terminal. Connect one scope probe to the negative terminal
also, and the other to the positive terminal. Set the scope up
to subtract the ground signal from the ripple signal, and the
resulting waveform will be a more accurate representation
of the ripple.
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