TNY285DG design smps generate low voltage then rated

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irfan.sciter@gm...

TNY285DG design smps generate low voltage then rated

Hi,

We have design smps using TNY285DG .which generate low voltage then rated specification.

smps have 03 output 3.3V/0.1A  ,24V/0.15A and 3.3V/0.25A.

3.3V/0.1A- give 2.9V no load and with 20mA load 2V ,

24V/0.15A-give 22.3V no load and with 20mA load 13V ,

3.3V/0.25A-give 1.72V no load and with 20mA load 1.2V .

Please guide us.

 

 

 

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Fri, 07/22/2016 - 05:18

irfan.sciter@gm...

Waiting for reply

We are waiting for your reply.

Actualy we want to use this smps in our street light product and product in end stage .every thing is ready accept smps.

Thanks & Regards 
Irfan Memon 
Sr.Hardware Engineer 
SciTER Technologies Pvt. Ltd. 
4th Floor, Bhikhubhai Chambers, 
Opp. Dipak Petrol Pump, 
Ellisbridge, Ahmedabad - 380006 
Gujarat, INDIA 
+91 79 26585857, Ext: 205 
www.sciter.in 
irfan.memon@sciter.in 
Skype: irfan.sciter 

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Fri, 07/22/2016 - 16:15

PI-YY

Follow up

Hello Irfan,

 

Thank you for considering using Power Integrations porducts.

 

As this is multioutput design. Can you share the schematic. I think the problem is caused by the cross regulation. You may need to add some pre-load on each output.

 

Best Regards

 

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Fri, 07/22/2016 - 20:50

irfan.sciter@gm...

Share Schematic for reference

Hi,

Attached is the schematic of smps which are support 90-277VAC as well as 480VAC.some components need to connect when use as 480VAC.currently by pass 480VAC components using connect R10.

 

Thanks,

Irfan

Title Size
 PSEM-01.01.01_2.pdf 66.32 KB

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Fri, 07/22/2016 - 22:35

irfan.sciter@gm...

Connect pre load resistor on each output

Hi,

Connect Pre-load resistor 1mA/5mA on each output but output are still low as below,

3.3V/0.1A- give 2.4V no load  with 5mA pre load ,

24V/0.2A-give 18.3V no load with 5mA pre load  ,

3.3V/0.25A-give 1.72V no load with 5mA pre load  

meanwhile also share the transformer details with you.

 

Thanks,

Irfan

Title Size
 ED22V1R1_01.01.03_70316.png 144.75 KB

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Sun, 07/24/2016 - 20:16

irfan.sciter@gm...

Waiting for reply

Hi,

Please reply asap.

Thanks,

Irfan

첨부 파일Size
PSEM-01.01.01_2.pdf66.32 KB
ED22V1R1_01.01.03_70316.png144.75 KB