Lm2596-12 voltage drop with load and getting heat

Hello,

Would you please send us your schematic and the board layout? What package of the IC are you using?

Regards,
Akshay

hi,I am using the LM2596S-12/NOPB. the schematic is given below.

Hello Anand,

Somehow your attachments haven't come through. Would you please resend them? 

The LM2596S has an exposed tab that should be well soldered on to copper. This functions as heat sinking. If this is not well soldered then it could cause thermal runaway and limit the circuit performance with respect to the load. Please also send us your layout.

Thanks,
Akshay

hi,

can you give me the component value for vin=40v.

Hi Anand,

Can you specify what you mean by Component value? Have you tried using Webench first to design the schematic for your specific application?

Thanks,

Anston

Hello all

The Component value is as shown for 40 volts.

How many Ohm is your load? and how many Amp is your supply?

keep in mind that its easier to create voltage from amperage then amps from voltage.  

your supply amp rating should equal your load required amperage without exceeding the chips max amp rating.

I hope this helps.