AN10881
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Application note
Rev. 2 — 26 September 2011
23 of 102
NXP Semiconductors
AN10881
TEA1713 resonant power supply control IC with PFC
The SUPREG has an UnderVoltage Protection. When the SUPREG voltage drops below
the 10.3 V two actions take place:
•
The IC stops operating to prevent unreliable switching due to too low gate driver
voltage. The PFC controller stops switching immediately, but the HBC continues until
the low-side stroke is active.
•
The maximum current from the internal SUPREG series stabilizer is reduced to
5.4 mA. In case of an overload at SUPREG in combination with an external DC supply
for SUPIC, this action reduces the dissipation in the series stabilizer.
It is important to realize that in principle, SUPREG can only source current.
The drivers of GATELS and GATEPFC are supplied by this voltage and draw current from
it during operation depending on the operating condition. Some change in value can be
expected due to current load and temperature:
Voltage characteristics for load
Voltage characteristics for temperature
Fig 9.
Typical SUPREG voltage characteristics for load and temperature
001aal002
SUPREG load current (mA)
0
60
40
20
10.905
10.895
10.915
10.925
SUPREG
voltage
(V)
10.885
SUPIC = 17 V
SUPIC = 20 V
Temperature (
°
C)
−
50
150
100
0
50
001aal021
10.85
10.90
10.80
10.95
11.00
SUPREG
voltage
(V)
10.75
