UCC28070: About QVFF levels(circuit)

Hide

Guru 21045 points

Part Number: UCC28070

Hi Team,

We have two questions for QVFF levels(circuit).

[Q1]

We understand that QVFF levels is changed by VINAC peak.

When QVFF levels is changed (From level2 to level1), does any problem occur (for example, switching stops etc.)?

[Q2]

If we change "VIN" slowly (“From 85VAC to 265VAC” or “From 265VAC to 85VAC”),

Does the change of QVFF levels adversely affect UCC28070 operation (for example, switching stops etc.)?

Regards,

Hide

over 3 years ago

0 Peter Meaney over 3 years ago

TI__Mastermind 31580 points

Hi Hide,

The update of the QVFF table does not cause any disruption in the operation of the UCC28070 device.The update will also not be affect by slow varaitions in the input voltage from 85Vac to 265Vac.

Page 20, Section 7.3.10 of the datasheet describes the QVFF operation and the advantages it confers over a continuous VFF system.

Regards

Peter

0 Hide over 3 years ago in reply to Peter Meaney

Guru 21045 points

Hi Peter-san,

Thank you for your prompt reply.

I greatly appreciate your cooperation.

Regards,

Hide

Power management

Power management forum

UCC28070: About QVFF levels(circuit)