AN10881
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© NXP B.V. 2011. All rights reserved.
Application note
Rev. 2 — 26 September 2011
9 of 102
NXP Semiconductors
AN10881
TEA1713 resonant power supply control IC with PFC
6
SUPIC
IC voltage supply input and output of the internal HV start-up source.
All internal circuits are directly or indirectly (via SUPREG) supplied from this pin, except for the
high-voltage circuit.
The buffer capacitor on SUPIC can be charged in several ways:
•
Internal High-Voltage (HV) start-up source
•
Auxiliary winding from HBC transformer or capacitive supply from switching half-bridge
node
•
External DC supply, for example a standby supply
The IC enables operation when the SUPIC voltage has reached the start level of 22 V (for
HV-start) or 17 V (for external supply). It stops operation below 15 V and a shutdown reset is
activated at 7 V.
7
GATEPFC
Gate driver output for PFC MOSFET.
8
PGND
Power ground. Reference (ground) for HBC low-side and PFC driver.
9
SUPREG
Output of the internal regulator: 10.9 V.
Internal IC functions such as the MOSFET drivers use the supply created by this function . It can
also be used to supply an external circuit.
SUPREG can provide a minimum of 40 mA.
SUPREG becomes operational after SUPIC has reached its start level.
The IC starts full operation when SUPREG has reached 10.7 V.
UVP: If SUPREG drops below 10.3 V after start, the IC stops operating and the current from
SUPIC is limited to 5.4 mA, to allow recovery.
10
GATELS
Gate driver output for low side MOSFET of HBC.
11
n.c.
Not connected, high-voltage spacer.
12
SUPHV
High-voltage supply input for internal HV start-up source.
In a standalone power supply application, this pin is connected to the boost voltage. SUPIC and
SUPREG are charged with a constant current by the internal start-up source. SUPHV operates
at a voltage above 25 V.
Initially the charging current is low (1.1 mA). When the SUPIC exceeds the short circuit
protection level of 0.65 V, the generated current increases to 5.1 mA. The source is switched off
when SUPIC reaches 22 V which initiates a start operation. During start operation, an auxiliary
supply takes over the supply of SUPIC. If the takeover is not successful, the SUPHV source is
reactivated and a restart is made (SUPIC below 15 V).
13
GATEHS
Gate driver output for high-side MOSFET of HBC.
14
SUPHS
High-side driver supply connected to an external bootstrap capacitor between HB and SUPHS.
The supply is obtained using an external diode between SUPREG and SUPHS.
15
HB
Reference for the high-side driver GATEHS.
It is an input for the internal half-bridge slope detection circuit for adaptive non-overlap
regulation and Capacitive mode protection. It is externally connected to a half-bridge node
between the MOSFETs of HBC.
16
n.c.
Not connected, high-voltage spacer.
Table 2.
Pinning overview
…continued
Pin
Name
Functional description
