Quick question, Im designing a proto-board for a mcp1640 dc-dc converter, can someone check if the design will work?
The DPDT switch is for between normal mode and "power saving mode", where the enable pin and feedback resistors are controlled from a remote mcu.
If in "power saving mode", the mcu will control the enable pin and mosfet gate pin.
In normal mode, the feedback resistors are always in circuit, and the enable pin is connected to the input voltage.
The jumper is for selecting between 3.3V and 5V.
Anyone see any major problems?
*not the final design of course, just a overview of the functionality of the design.
What voltage is generated when the changeover switch is in the middle and connects to neither side? Does that matter?
ah i meant its a SPDT switch, so there is no "middle" My mistake.
Only problem that i can see is that if the switch is in "low-power" mode initially, and the micro-controller doesnt start up, the enable pin will not be set.
So on the first-startup, it must be in normal mode to start the mcu and set the enable pin. Then a user can change it to "low power".
