104Embedded Modules
© Tibbo Technology Inc.
Notes:
·
U1 (MC35063) is a very popular power IC manufactured by ON Semiconductor.
·
R1 is very important. It is just 1 (one!) Ohm, but we really do not recommend the
user to omit it.
·
R2 and R3 are "1% tolerance" (high-precision) because they define the output
voltage of the power supply.
·
C1 and C3 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. R1 can be adjusted to achieve a better (cleaner) square
wave signal on a particular PCB layout. There are no recipes here -- just try
and see what works for your circuit.
Mechanical Dimensions
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