LM2675 12V to 3.3V Conversion Circuit Check with PJ-006A-SMT-TR Jack Compatibility

Hi.,

we select the wall adapter EMSA120150-P5P-SZ for 12v and 1.5mA then choose the jack(PJ-006A-SMT-TR) for this 12v adapter.
we convert the 12v to 3.3v for my project using the LM2675.
Please check the Circuit Connection is correct or Not?
Normally power chips recommends what their chip need to work.
Please check this and add if required.



Thanks&Regards..,
K.Manochitra.

Pin 2 and Pin 3 should be grounded "Easy to find out " Isolate the supply pin out first (disconnect the center pin from the circuit ) then use a multi meter and check btw PCB ground and center pin see if you have the correct supply if no supply or very low then answer is faulty connector More like the answer

“ I’m designing equipment but I cant use a DVM , hmmm , doesent sound to clever to me ”

This type of power input socket has a third contact to automatically change over from battery power to external power when the power supply plug is inserted. Effectively, a normally closed (NC) switch is opened when the plug is inserted.

On the diagram: (Typical arrangement, most (but not all), have the centre pin positive.)

Pin 1 is the central pin of the socket.
Pin 2 is the contact for the outer sleeve.
Pin 3 is the contact for the equipment's internal battery.

When the power plug is inserted, it disconnects the negative battery terminal.
(Breaks the connection between pin 2 and 3.)

If you have no battery in the equipment, you can just leave pin 3 unconnected.

See datasheet

Your supply in doesent sound to clever either 12 volts at 1.5 ma Nope dont think so !!

I think frank is correct on this if I remember but Im not sure now long time since ive had to replace one easy answer is USE A DVM to find out and isolate center pin hot side from the rest of the circuit


Looking at the datasheet quiesant is 20ma no load
so input in at 12 volts 1.5ma isnt even enough to keep this circuit on !!

Thats acc what your telling us so far

If your really in doubt connect both pin3 and two
permanent ( Short them together Wont hurt ) That will tell you if you have another problem 9/10 you find the track broken around these pins which can be invisbile at times so do a continuity check between pins and pcb copper track as well Also common fault


What else can i think off barrel plug breaks internally causing intermittent supply can also cause problems buit it would help if you took some measurements with a dvm recorded your answers and showed us where on the schematic you are finding these voltages and with reference to what ground


DVM = Digital Volt Meter , "not Domain Map Value " and (Not Digital Movie File as in PC ) in this case, just in case as one never knows these days

Incredible !! Just Incredible Im sure im becomming Victor Meldrew , No blairy golden wonder these IPHONE convertors dont work "


http://www.ti.com/lit/ds/symlink/lm2675.pdf

Thanks for your Explanation.
How can i connect the PJ006A with the LM2675 IC Pin VIN.
please suggest me.Because now i connect the Pin 1 to the VIN of LM2675.

Pin2 to GND
Pin3 NC(No Connection)
This connection produce any issues please guide me.



Best Regards.,
Manochitra.k

Hi.

Thanks for your Explanation. How can i connect the PJ006A with the LM2675 IC Pin VIN. please suggest me.Because now i connect the Pin 1 to the VIN of LM2675.
Pin2 to GND Pin3 NC(No Connection) This connection produce any issues please guide me.

Best Regards.,
Manochitra.k