94Embedded Modules
© Tibbo Technology Inc.
Notes:
·
U1 (AP1501-33) is a popular power IC manufactured by Anachip (now Diodes
Incorporated, www.diodes.com)
·
C1 and C2 capacitors: Do not use SMD capacitors -- use regular through-hole
aluminum capacitors. This really helps reduce noise produced by the power supply.
·
This is an analog circuit, so layout matters. Apply reasonable "good layout" effort.
Ideally, one should use an oscilloscope to see what sort of "square wave" the
power supply generates, both at low and high input voltages, as well as light
and heavy loads. There are no recipes here -- just try and see what works for
your circuit.
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