Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

L298N to control a 12V DC motor driver - problem

Status
Not open for further replies.
E

engkeat

Junior Member level 1
Joined
Aug 18, 2008
Messages
15
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,409
motor driver

i have tried using L298N to control a 12V DC motor which required to drive 1.44A, but i found that the output of L298N that generate to the motor tend to drops to half of the voltage that i supplied to input pin of L298N, and the maximum voltage that manage to supplied to the motor is only achieve around 3V, while i required 7~8V for the motor to lift certain load...anyone have any idea on it???
 

motor driver

My guess is that the resistor connected to the sense pin is too large. The motor is requiring more current that the sense pin resistor is permitting to flow through the circuit.

Does the motor run if it is connected without any load?

Note: The datasheet indicates that the gates within this part can be connected in parallel for more current. You may require a parallel connection.
 

Re: motor driver

the motor is running at free load, just but the voltage that supplied to the motor can reach around 3V, which the motor rotate at slow speed, and i try to increase the voltage at input pin but it only can reach 7V, i direct connect the sense pin to ground, i have tried 10 ohm for sensing resistor but the motor not rotate at all at that moment...
 

Re: motor driver

You didn't tell a word about the intended control method (PWM or simple on/off operation). Rsense would utilized in constant current PWM mode or possibly as an overcurrent sense. 10 ohms is a clear case of a too large resistor, as guessed by banjo. But there may be more faults in your circuit.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top