TEA1716T
NXP Semiconductors
Resonant power supply control IC with PFC
7.2 Power supply
The TEA1716 contains several supply-related pins.
7.2.1 Low-voltage supply input (pin SUPIC)
The SUPIC pin is the main low-voltage supply input to the IC. All internal circuits (other
than the high-voltage circuit) are directly or indirectly (via SUPREG) supplied from this pin.
SUPIC is connected externally to a buffer capacitor CSUPIC. This buffer capacitor can be
charged in several ways:
• from the internal high voltage start-up source
• from the auxiliary winding of the HBC transformer
• from the capacitive supply of the switching half-bridge node
• from an external DC supply, for example, a standby supply
The IC starts operating when the voltage on SUPIC reaches the start level, if the voltage
on SUPREG has also reached the start level. The start level depends on the condition of
the SUPHV pin:
• High voltage present on SUPHV, VSUPHV > Vdet(SUPHV)
.
This is the case with a stand-alone application where CSUPIC is initially charged from
the HV start-up source. The start level is Vstart(hvd)(SUPIC) (20 V typical). The wide
difference between the start and stop (Vuvp(SUPIC)) levels allows energy to be stored in
the SUPIC buffer capacitor. This energy is used to supply the IC until the output
voltage has stabilized.
• Not connected or no voltage present at SUPHV, VSUPHV < Vdet(SUPHV)
.
This is the case when the TEA1716 is supplied from an external DC source. The start
level is Vstart(nohvd)(SUPIC) (15 V typical). The IC is supplied from the DC supply during
start-up. To minimize power dissipation, the DC supply to pin SUPIC must be above,
but close to, Vuvp(SUPIC) (13 V typical).
The IC stops operating when VSUPIC drops below Vuvp(SUPIC). This is the SUPIC
UnderVoltage Protection (UVP) voltage (UVP-SUPIC; see Section 7.9). The PFC
controller stops switching immediately, but the HBC controller continues operating until
the low-side MOSFET becomes active.
The current consumption depends on the state of the IC. The TEA1716 operating states
are described in Section 7.3.
• Disabled IC state
When the IC is disabled via the SSHBC/EN pin, the current consumption is very low
(Idism(SUPIC)).
• SUPIC charge, SUPREG charge, Thermal hold, Restart and Protection shut-down
states
Only a small section of the IC is active while CSUPIC and CSUPREG are charging during
a restart sequence before start-up or during shutdown after a protection function has
been activated. The PFC and HBC controllers are disabled. Current consumption is
limited to Iprotm(SUPIC)
.
TEA1716T
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Objective data sheet
Rev. 1 — 27 January 2012
7 of 46
ETC [ ETC ]
