AN10881
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Application note
Rev. 2 — 26 September 2011
88 of 102
NXP Semiconductors
AN10881
TEA1713 resonant power supply control IC with PFC
11.2.2.2
Operational check with mains voltage
There is no simple step by step method of gradually increasing the mains voltage to start
PFC operation. So full mains voltage is applied to check PFC functionality. While doing
this, remove any external voltage source on SNSMAINS and SNSBOOST.
If a problem is expected of an output voltage that can be too high, the output
measurement resistor from SNSBOOST to ground can be (temporarily) increased in
value. This leads to a lower output voltage regulation setting.
Supply a DC voltage to the mains input instead of the usual AC voltage to be able to
observe proper PFC operation more easily with an oscilloscope. This results in more
stable signals for evaluation.
11.2.3 HBC and PFC operation
When both converters work properly independently, they can be checked working
simultaneously. Remove the additions used for start-up and debugging.
Remark:
A (normal) ripple voltage on V
BOOST
results in some continuous frequency
variations in the HBC for compensation. At high output power, the voltage ripple on
V
BOOST
is larger.
Fig 62. Typical GATEPFC signals without mains voltage
GATEPFC
GATEPFC
GATEPFC
lowering the external voltage on SNSBOOST and SNSMAINS
001aal103
