AN10881
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© NXP B.V. 2011. All rights reserved.
Application note
Rev. 2 — 26 September 2011
24 of 102
NXP Semiconductors
AN10881
TEA1713 resonant power supply control IC with PFC
5.5.1 Block diagram of SUPREG regulator
5.5.2 SUPREG during start-up
SUPREG is supplied by SUPIC. SUPIC is the unregulated external power source that
provides the input voltage for the internal voltage regulator that provides SUPREG.
At start-up SUPIC must reach a specific voltage level before SUPREG is activated:
•
Using the internal HV supply, SUPREG is activated when SUPIC
22 V
•
Using an external low voltage supply, SUPREG is activated when SUPIC
17 V
5.5.3 Supply voltage for the output drivers: SUPREG
The TEA1713 has a powerful output stage for GATEPFC and GATELS to drive large
MOSFETs. These internal drivers are supplied by SUPREG that provides a fixed voltage.
It can be seen from
that current is taken from SUPREG when the external
MOSFET is switched on by charging the gate to a high voltage.
Fig 10. Block diagram of internal SUPREG regulator
001aal022
11 V
5.4 mA
CSUPIC
CSUPREG
SUPIC
SUPREG
SupReg
EnableSupReg
SUPHV SOURCE
V
AUXILIARY
reduced
current
SupRegUvStart
startlevel = 10.7 V
SupRegUvStop
stoplevel = 10.3 V
Fig 11. Simplified model of MOSFET drive
001aal023
EXTERNAL
GATE CIRCUIT
SUPREG
RDS-ON
Cgs
Vgs
I
discharge
I
charge
RDS-ON
TEA1713