AN10881
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© NXP B.V. 2011. All rights reserved.
Application note
Rev. 2 — 26 September 2011
86 of 102
NXP Semiconductors
AN10881
TEA1713 resonant power supply control IC with PFC
The following list provides an association between pins and the protection states for which
they are being monitored:
•
SSHBC/EN:
When the TEA1713 lowers the voltage to this pin, it indicates a protection with
correction to high frequency.
•
RFMAX:
The voltage level on RFMAX indicates the oscillator frequency, which can cause a
high frequency protection.
•
CFMIN:
A (partially) slow oscillator signal cannot observe proper detection of HB slope or a
possible Capacitive mode detection.
•
PGND and SGND:
If the TEA1713 detects HB operation while there is zero input voltage, it indicates that
the connection between these pins at the IC is not present. Gate currents lead to false
HB-slope detection.
•
SNSCURHBC:
Any disturbances on this pin (voltage spikes) can lead to an increase of frequency
while the original measurement voltage/signal is OK.
Fig 60. Typical signals during a separate HBC start-up for an increase in V
BOOST
V
BOOST
= 100 V
HB slope is too slow for proper
detection -> High frequency
running
Increase output current -> HB slope
is fast enough for proper detection
-> Low frequency running by
"normal" SNSFB regulation
V
BOOST
= 0 V
V
BOOST
= 300 V
V
BOOST
= 40 V
V
BOOST
= 60 V
V
BOOST
= 100 V
V
BOOST
= 395 V
V
BOOST
= 350 V
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