Author Topic: Unregulated lm2596  (Read 739 times)

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Offline conducteurTopic starter

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Unregulated lm2596
« on: August 20, 2019, 02:32:25 pm »
I have troubles with my lm2596 power supply. I have this circuit on a pcb and it doesn’t work. Tried different inductors, two types of diodes,... I soldered the components together with a few wires to know if there’s a problem with my pcb...  but the output voltage is also just below the supply voltage...
 
Output C = 680uF en load =39 OHM
« Last Edit: August 20, 2019, 02:34:15 pm by conducteur »
 

Offline thinkfat

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Re: Unregulated lm2596
« Reply #1 on: August 20, 2019, 03:55:25 pm »
You mixed up pin 1 and 2.

EDIT: but it's really hard to see with the tangled mess you have created there.
« Last Edit: August 20, 2019, 03:57:17 pm by thinkfat »
Everybody likes gadgets. Until they try to make them.
 

Offline mariush

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Re: Unregulated lm2596
« Reply #2 on: August 20, 2019, 04:26:03 pm »
you're dealing with a switching power supply IC, running at 50-100kHz ... at the very least put it on a prototyping board.
It won't work right with wires floating like that.
 

Offline conducteurTopic starter

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Re: Unregulated lm2596
« Reply #3 on: August 20, 2019, 05:46:12 pm »
 Thank you very much thinkfat! I made that mistake when creating the symbol for this part in EAGLE and used my schematic as a reference (bad idea when you're troubleshooting such problems).... Could search this circuit for hours to find that one!  |O Now I have to find out if I can mod the PCB...
« Last Edit: August 20, 2019, 05:54:08 pm by conducteur »
 


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