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Installation and Operation
FIGURE 2-5:
MCP1640 12V/50 mA Two Cells Input Boost Converter
Reference Design Test Points (SWH, SWL), Inductor (I L ) and Load Current (I OUT )
Waveforms for 60 mA Load and 2.4V Input in Continuous mode.
2.2.3
How Does the MCP1640 12V/50 mA Two Cells Input Boost
R T = R B × ? ------------- – 1 ?
? V FB
Converter Reference Design Works?
The board was designed to boost low voltage from two alkaline cells or NiCd/NiMH
cells to high voltage. The topology used in this reference design is adapting a
low-voltage boost converter into a high-voltage boost converter using a single inductor,
instead of using a flyback topology that requires a more expensive flyback transformer.
Another advantage is that the switching voltage spikes are kept below the safe value,
6V, for MCP1640 device’s SW pin.
The converter is configured as nonsynchronous; an external diode, D, is connected
between the inductor and the high-voltage output (V OUT ).
The two sense resistors, R T and R B , set the output (V OUT ) at 12.0V according to the
following equation:
EQUATION 2-1:
V OUT
?
Where:
V FB
V FB
V OUT
R B
=
=
=
=
1.21V
Reference voltage of the FB pin
12.0V
Resistor ’s value is selected by the designer
Note:
? 2011 Microchip Technology Inc.
The reference board is tested up to 24V output with a maximum load of
20 mA. The internal error amplifier is a transconductance type; its gain is
not related to the feedback resistors’ values.
DS51999A-page 17
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