AN10881
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Application note
Rev. 2 — 26 September 2011
48 of 102
NXP Semiconductors
AN10881
TEA1713 resonant power supply control IC with PFC
CMR of the TEA1713 can be recognized by the typical slowing of the oscillator in
combination with the discharging of SSHBC/EN.
Fig 25. Capacitive/Inductive HBC operating frequencies
001aal035
load independent point
(series resonance)
f0
@ Vimax
@ Qmax
@ Qnom
@ Qmin
@ Vinom
@ Vimin
Mmin
Mnom
1
Mmax
resistive
inductive
capactive
fl
fr
fmax
f
M =
V
i
a·V
o
Oscilloscope traces contain normal time-base (top) and zoomed view (bottom)
Fig 26. Typical protection and regulation behavior in Capacitive mode (during bad start-up)
001aal036
Typical behavior at capacitive
mode protection/regulation
Frequency increaseby capacitive
mode protection/regulation
(notice voltage drop on SSHBC/EN)
HB
HB
SNSCURHBC
SSHBC/EN
Voutput
CFMIN
SSHBC/EN
Voutput
