I am very, very new to electronics. I do understand some, but I lack any real foundation and am hoping someone can answer this.
Here is what I want to achieve. I have a motor driver (LMD18200). The chip can handle 3 amps continuous, and 6 amps peak. I have the chip driving a DC motor. The DC motor may draw up to 7 or 8 amps when the motor is stalled. Running, it only draws about 2 to 2.5. The problem is that my mechanical system relies on the motor stalling when it has reached a hard limit. This is a normal condition for this mechanism. That 7 or 8 amps can burn up my motor driver....
After reading some stuff online, I though that I could connect a GIANT 2 ohm resistor between the power source (12 volt car battery) and the input to the motor driver circuit. Using ohms law, I = 12v / 2 ohm, I = 6 amps. So that means at MOST only 6 amps will reach my motor driver? Am I missing something - or is it really that simple? I understand cars really put out more than 12 volts, and perhaps I want to tweak the resistor value to NOT be so close to the limit of the chip. Any input would be helpful. THanks so much,
Does that effect current flow under regular conditions? In other words, am I goign to be starving my motor under normal conditions?
Here is what I want to achieve. I have a motor driver (LMD18200). The chip can handle 3 amps continuous, and 6 amps peak. I have the chip driving a DC motor. The DC motor may draw up to 7 or 8 amps when the motor is stalled. Running, it only draws about 2 to 2.5. The problem is that my mechanical system relies on the motor stalling when it has reached a hard limit. This is a normal condition for this mechanism. That 7 or 8 amps can burn up my motor driver....
After reading some stuff online, I though that I could connect a GIANT 2 ohm resistor between the power source (12 volt car battery) and the input to the motor driver circuit. Using ohms law, I = 12v / 2 ohm, I = 6 amps. So that means at MOST only 6 amps will reach my motor driver? Am I missing something - or is it really that simple? I understand cars really put out more than 12 volts, and perhaps I want to tweak the resistor value to NOT be so close to the limit of the chip. Any input would be helpful. THanks so much,
Does that effect current flow under regular conditions? In other words, am I goign to be starving my motor under normal conditions?