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TNY290PG - OUTPUT LOADING ISSUE

Posted by: anurag lokhande on Mon, 08/23/2021

HI,

SMPS designed for 12V 2A.  ( Output waveform for voltage is clean at 0.7A load)

Please see results

Input AC Output
Vin I Vout R load Iout W
160 0.07 12.23 20 0.6115 7.478645
160 0.1 12.25 17.8 0.688202 8.430478

Used reference from

--> Application note

Reference Design Report for a 20 W Standby
Power Supply Using TinySwitchTM-4
TNY290PG

 

Following are observation

1. At input voltage 160V, output voltage goes into hiccup mode when I increase load further

2. If Input voltage increase above 160V at constant load of 0.7A, the output voltage goes into hiccup mode

Please give your advice. Please let me know for any input required for further analysis. 

 

Comments

Submitted by PI-BERJ on Mon, 08/30/2021

Hi,

TNY290PG might have gone into overload. Details are in the Auto-Restart section in the datasheet. Is the hiccup duration every 2.5s?

Regards,