AN10907
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© NXP B.V. 2010. All rights reserved.
Application note
Rev. 1 — 28 December 2010
48 of 82
NXP Semiconductors
AN10907
TEA1613T resonant power supply control IC
9.2 PFC burst mode operation control by SNSOUT/PFCON
The PFC can be made to burst simultaneously with the HBC in burst mode. By doing this,
the converters operate for a limited time, followed by a time of no-operation. Burst mode
operation increases the efficiency in low-load conditions.
The SNSOUT/PFCON provides an on/off switching signal that can be used to stop and
start the PFC. This signal switches between the voltage level for output voltage monitoring
(2.35 V < V
SNSOUT/PFCON
< 3.5 V) and ground. An internal switch makes this voltage low
when the HBC is put on hold by the SNSBURST function.
The behavior and interfacing circuit of this system for synchronous burst mode depends
on the properties of the PFC-control circuit.
Fig 33. Burst mode application
001aal457
3.2 V
8 V
1.5
k
Ω
SNSFB
SNSBURST
RBURST1
RBURST2
TEA1613
CONTROL
HOLDHBC
3.5 V
0.1 V
compensation of burst
voltage level by boost voltage
SNSBOOST
SPIKE
FILTER
4
1
1.7
SNSBOOST [V]
I
cmp
[
μ
A]
2.5
