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Motor control 8*16mm 3.7v coreless motors

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Ramila

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Hi,
I'm making a small drone with 8*16mm coreless 3.7v motors. It controls by a node mcu (A development bored with wifi). When controling the speed of motors nodemcu's output signal ranges from 0v to 3.3v then the supply to a motor should be range from 0v to 3.7v at 2A (may be less but I want to be secure) current (for a one motor).
I used one d313 transistor (only transistor) with my 3.7v battery then at highest speed it gives output of 2.5v or less.
Can anyone help?
 

Hi,

Did you read the datasheet?
It says 1V VCE with 2A ... but this is with 0.2A of base current, which I assume you dont have.
Less base current, higher dropout voltage.

For less dropout voltage you should consider to use a MOSFET.

choose one with
* Low V_GS_Th, much less than 3.3V, they are often called "logic level" Mosfet
* low R_DS_ON. It should be less than expected_dropout_voltage / expected current.

Almost any MOSFET manufacturer and any distributor provides interactive selection guides for choosing a suitable MOSFET.

Klaus
 

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