AN10907
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Application note
Rev. 1 — 28 December 2010
51 of 82
NXP Semiconductors
AN10907
TEA1613T resonant power supply control IC
9.5 Choice of burst level and divider impedance
The power level at which burst mode is activated is set by a resistor divider on SNSFB.
The burst mode (V
BURST
= 3.5 V) is activated by the internal comparator on SNSBURST
at the SNSFB voltage level which can be chosen experimentally.
9.5.1 Basic design of an SNSBURST circuit
The SNSFB voltage level at which the converter enters burst mode can be chosen by a
resistor divider. This voltage value can be adapted to correspond with the internal preset
level of 3.5 V on the SNSBURST comparator.
Fig 38. Simultaneous HBC and PFC burst mode operation (and output voltage ripple)
001aal462
V
DRAIN.PFC
[100 V/div]
V
OUTPUT
[100 mV
AC
/div]
HB [100 V/div]
Fig 39. Designing the burst mode level using two resistor values
019aaa358
3.2 V
8 V
1.5
k
Ω
SNSFB
SNSBURST
RBURST1
RBURST2
RSBURST
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
