LNK304 Output Voltage drops
Hello everyone,
hope someone can help me on this one.
I am using the Power Integrations LNK304DN-TL at 5V output voltage. When the microcontroller is not utilized and unprogrammed (powered at 3V via a LDO), the voltage is stable at 5.0V.
However, if I programm the microcontroller and let it operate (consuming circa 80mA, <120mA as specified in the datasheet), the voltage drops to 4.5V.
Is this normal? Can you give me some details on the voltage swing/tolerance? I would be thankful if you could provide me with a spice model and/or some hints, as to whether this is normal and what should be considered.
I would be willing to share my circuit with a FAE, not publicly as this is a commercial project.
I am waiting for a reply, as we are expecting to start qualification by the end of this month.
Kind regards
J.
Comments
What is your lowest input voltage? does it have substantial ripple? does the 4.5Vout have substantial ripple? try a bigger link switch, or a cap on the HV to bring up the min valley voltage...
Hi,
If you have still problem, please let us know.
Thanks.
Hi,
Output voltage regulation should be within 5%.
To check your component values/design you may want to visit our online design guideline below.
https://piexpertonline.power.com/site/login
Regards.