[SOLVED] Problems with using LM2575HVT-5 to step down 54VDC to 5V

[prasad70]

I want to use LM2575HVT-5 regulator to step down 54VDC to 5V. Required current is around 300mA. I tested circuit but evry time IC became faulty just after power was given. IC was very hot at that time. I used 680 micrH Muratta inductor and MBR160 diode .
Can some one pls help me on this.

 

[ud23]

Re: LM2575HVT-5 problems

I want to use LM2575HVT-5 regulator to step down 54VDC to 5V. Required current is around 300mA. I tested circuit but evry time IC became faulty just after power was given. IC was very hot at that time. I used 680 micrH Muratta inductor and MBR160 diode .
Can some one pls help me on this.

why you are using 680uh inductor??

see atteched file try with 100uh inductor and for just 300ma requirement you have many other choice step down ICS

 

[prasad70]

Re: LM2575HVT-5 problems



According inductor selection criteria, it's value should be 680 microH for 60V input.

thk

 

[prasad70]

Re: LM2575HVT-5 problems

I tested circuit again using new components but i used new board this time. I found that problem was the distance between IC and input filter cap. Once I placed the capacitor closer the IC , problem dissapeared. Now circuit is working well.

thks