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Author Topic: Problem with lm2576 in the circuit?  (Read 1495 times)

Offline Vickysong

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  • Posts: 8
Problem with lm2576 in the circuit?
« on: June 07, 2017, 08:14:27 AM »
As shown in the above, the output voltage of lm2576 is a stable adjustable voltage.
Fault phenomenon: voltage falls sharply after the connection to the load, and the motor can not run.
My testing work: (1) when the load is connected, I open. The input voltage is only 2.56 V, and output is 1.56 V, which is unable to drive the motor (normally input is 7.56 V and output is 5-12 V adjusted by potentiometer). The datasheet of LM2576 is here
(2) after I replace the new battery, it is the same.
(3) I disconnect the load, the the 2576 works normally (input normally, and the output is adjustable)
(4) the resistance of motor is 0.8 ohm. unknown inductance is 2.7 ohm.
(5) the circuit diagram is incomplete because it is based on my drawing line followed circuit boards
(6) entity is a flow adjustable vacuum pump

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Offline Jeg

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Re: Problem with lm2576 in the circuit?
« Reply #1 on: June 09, 2017, 12:50:46 PM »

(5) the circuit diagram is incomplete because it is based on my drawing line followed circuit boards

Hallo Vickysong :)
Don't expect much help when there is not any circuit drawing. Have you implemented the circuit as per data sheet? Look at page 14 of the attached datasheet.


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