The L6203 circuit diagram is very simple to build and could be constructed using
screw terminals, and wires cut to size. The IC mounts on an aluminium block with
lengths of wires soldered to its terminals.
Almost any kind of terminal blocks will work where you can insert wires from either
ends and tighten the screw to join the wires together. As you can see from the
diagram above, you can easily build the whole circuit using these types of blocks.
Since there is no PCB in this build, I decided to use an in-line fuse holder for the
fuse. These are cheaply available from most good electronics stores and eBay.
For the circuit to work, pin 11 requires a feed from a 3.3 V rail. The "Enable" pin
can accept voltage between 3.3 V and a maximum of 7 V.
Power Supply
The minimum operating voltage is 12 V; however, a pair of PP3 9V dry cells in
series produces 18 V, could work for testing purposes. Alternatively, a 12 V adapter
could work as well. This type of circuit will drain the current from the battery very
fast, and therefore alkaline dry cells are the best for testing it.
Do not use any kind of rechargeable battery packs for testing this circuit, especially
if you are not a qualified electronic engineer, as this circuit will drain the power at
an enormous rate. Always take safety precautions when handling any kind of power
source.
This Article Continues...
Raspberry Pi Motor Controller L6203
L6203 Chip Mounting
Raspberry Pi Motor Controller L6203 Circuit
L6203 PWM: Pulse Width Modulation
PWM: Pulse Width Modulation Principle
Back Electro-Motive Force (EMF)
Raspberry Pi GPIO PWM Pin
L6203 Datasheet