UCC2818A-Q1: VFF pin voltage

Gene Qiu

Part Number: UCC2818A-Q1

Hi team,

What is the maxium voltgae VFF pin can stand of UCC2818A-Q1, since i notice on datasheet, the VFF voltage only shows around 4.7V as below. Does this mean, the VFF voltage can not exceed 4.7V?

Best Regards,

Gene

over 5 years ago

0 John Griffin1 over 5 years ago

TI__Mastermind 34465 points

Hello Gene,

VFF is an output pin and its voltage value is a representation of the RMS input voltage.

It can never be above the internal 7.5V reference level.

Its operational range should vary from about about 1.4V to 4.7V as shown in the curve above.

Regards

John

0 Gene Qiu over 5 years ago in reply to John Griffin1

TI__Intellectual 1720 points

Hi John,

As I notice on datasheet figure 5, Typical Application Circuit, the Vline is 85-270Vac.

for customer requirements, if Vline ranges from 70-280Vac, can the Vff go beyond 4.7V? Or in this case how could customer adjust to use?

Best Regards,

Gene

0 John Griffin1 over 5 years ago in reply to Gene Qiu

TI__Mastermind 34465 points

Gene

This is a separate question and requires a separate posting.

If you feel the previous question was answered then please mark this posting as resolved.

Regards

John

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UCC2818A-Q1: VFF pin voltage