Hi, how to check if the L298 is damaged?
I’ve applied In1, In2, In3, In,4 EnA, and EnB all low. Vs 24V, Vss 5V.
In output I’ve about 6.5V 6.5V 6.5V 6.5V, Always, even if I change input values. It’s really damaged? L298 damage easily without exploding?
Thanks.
The only way to be certain of proper function is to have a load on the outputs (10-100 ohm resistor or similar) and apply all combinations of high and low to the inputs. Check the results against the truth table in the L298 data sheet.
Just about any motor driver can be destroyed instantly, by disconnecting the motor leads while it is powered up.
I’d rather test it with a 24 volt lightbulb than a resistor. You should be able to measure the voltage across the resistor with a multimeter, and that would indicate current flow and proper operation if the driver. But a light bulb would show it more directly.
Nothing… I think L298 damaged.
Tried with an other board, that is (L297+298) without load:
1: L297+L298 Vss 5v; L297 en 0v; L298 Vs 0v → Output 0v 0v 0v 0v
2: L298 Vs 24v → Output 6v 6v 6v 6v (why this 6v?)
3: L297 en 5v → Output 0v 24v 0v 24v (one step)
4: L297 en 0v → Output 6v 6v 6v 6v
5: L298 Vs 24v → Output 0v 0v 0v 0v
before this sequence readed from l298 datasheet, I’ve applied at the power on all voltages, so I think that in this case, the L298 will damaged.
In the damaged L298, I see:
1: L297+L298 Vss 5v; L297 en 0v; L298 Vs 0v → Output 0v 0v 0v 0v
2: L298 Vs 24v → Output 6v 6v 6v 6v
3: L297 en 5v → Output 6v 6v 6v 6v (no change!)
4: L297 en 0v → Output 6v 6v 6v 6v
5: L298 Vs 24v → Output 0v 0v 0v 0v
Let me try this once before I totally lose interest. Did you apply a load to the output like everyone is telling you to?