AN10907
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© NXP B.V. 2010. All rights reserved.
Application note
Rev. 1 — 28 December 2010
19 of 82
NXP Semiconductors
AN10907
TEA1613T resonant power supply control IC
6.5.1 Block diagram of SUPREG regulator
6.5.2 SUPREG during start-up
SUPREG is supplied by SUPIC. SUPIC is the unregulated external power source that is
the input voltage for the internal voltage regulator that provides SUPREG.
At start-up SUPIC needs to reach a specific voltage level before SUPREG is activated:
•
When start-up is by the internal HV supply, SUPREG is activated when SUPIC
22 V.
•
When start-up is by an external (low voltage) supply, SUPREG is activated when
SUPIC
17 V.
6.5.3 Supply voltage for the output drivers: SUPREG
The TEA1613T has a powerful output stage for GATELS and GATEHS to drive large
MOSFETs. These internal drivers are supplied by SUPREG which provides a fixed
voltage.
It can be seen from the simplified model that current is taken from SUPREG when the
external MOSFET is switched on by charging the gate to a high voltage.
Fig 9.
Block diagram of internal SUPREG regulator
001aal434
10.9 V
5.5 mA
CSUPIC
CSUPREG
SUPIC
SUPREG
EnableSupReg
SUPHV SOURCE
V
aux
reduced
current
SupRegUvStart
startlevel = 10.7 V
SupRegUvStop
stoplevel = 10.3 V
Fig 10. Simplified model of MOSFET drive
001aal435
EXTERNAL
GATE CIRCUIT
SUPREG
RDS-ON
Cgs
V
gs
I
discharge
I
charge
RDS-ON
TEA1613
