H Bridge for 12V @ 16mA

Thread Starter

AlbertHall

Joined Jun 4, 2014
12,345
I need an H bridge to power a motor. The power should always be applied to the motor in one direction or the other. The voltage should be 12V and the maximum current is 16mA.
Is there a small simple solution for this?
 

Ya’akov

Joined Jan 27, 2019
9,070
If you did want to build one, the L9110 motor control chip on these boards looks like what you need.

Here’s a schematic for the board:

919C4D3D-6676-4F7C-9886-19988E52FE9C.jpeg
 

Thread Starter

AlbertHall

Joined Jun 4, 2014
12,345
I looked at the L9110 but I would be using it at the maximum specified voltage and then there is the extra 0.7V from the inductive back emf. How reliable is it going to be?
I could add two diodes in series with supply but that would reduce the motor power which I would rather avoid.
 

Thread Starter

AlbertHall

Joined Jun 4, 2014
12,345
No 'off' setting?
No, the motor should always be powered. You may gather from the stall current, 16mA, that this is not a powerful motor so sudden reversal is not a problem. The motor is designed to cope with being permanently stalled.
 

LowQCab

Joined Nov 6, 2012
4,023
Use 1 each of these ....... MCP1406/07
~20-Volts, 1.3-Amps continuous,
available in SMD, PDIP, and To-220 packages, DigiKey has tons of them.
Put a 1uf Ceramic-Capacitor across the Motor-Terminals,
and a 10-Ohm Resistor in each Motor-Lead to the Chip(s) to kill any RFI that may destroy the FETs,
and to reduce the turn-on Current-Spike created by the Capacitor.
.
.
.
 

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Thread Starter

AlbertHall

Joined Jun 4, 2014
12,345
Use 1 each of these ....... MCP1406/07
~20-Volts, 1.3-Amps continuous,
available in SMD, PDIP, and To-220 packages, DigiKey has tons of them.
Put a 1uf Ceramic-Capacitor across the Motor-Terminals,
and a 10-Ohm Resistor in each Motor-Lead to the Chip(s) to kill any RFI that may destroy the FETs,
and to reduce the turn-on Current-Spike created by the Capacitor.
So two 8 pin chips and not much else - not a bad solution.
Digikey UK have no'1407 and are quoting dates in 2022, but RS have them so all is well.
 

Thread Starter

AlbertHall

Joined Jun 4, 2014
12,345
I have also come across the SN754410.
" The SN754410 is a quadruple high-current half-H driver designed to provide bidirectional drive currents up to 1 A at voltages from 4.5 V to 36 V. "
 
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