I am using a DC-DC converter(Schematic below) which converts +15V to -15V which is used to drive a 6W DC motor.




-15V_IN rail is connected to the motor. Whenever the motor is drawing the power from the converter i see a disturbance as shown in the image below(Blue trace is -15V_IN)


and when the motor is trying to drive against the gravity i see a dip in the voltage as shown in the image below.(Blue trace is -15V_IN)


Can anyone help me understand the problem and suggest a solution to it?

 

Is the yellow trace, the input voltage?
It would appear the motor current is too high for the converter.
What is the motor voltage rating?
Have you measured the motor current?

 

Is the yellow trace, the input voltage?
It would appear the motor current is too high for the converter.
What is the motor voltage rating?
Have you measured the motor current?

Is the yellow trace, the input voltage?--> No, Its some other signal on the system
It would appear the motor current is too high for the converter.
What is the motor voltage rating? 12V/6W Stall Current is around 2.17A
Have you measured the motor current? No

 

You have to design DC DC converters to output the necessary current at the necessary voltage. Anytime you see voltage sag when a current device is drawing current, it means too much current is being drawn. Ohm's Law.

 

Hello,

As said, the converter might sag as it can deliver 1.5 A max.



The given stall current of 2.17 A is to much for the converter.

Bertus

 

Why are you trying to put 15V into a 12V motor?