TEA1716T
NXP Semiconductors
Resonant power supply control IC with PFC
Enable detection
l
pu(EN)
V
pu(EN)
Enable supply
signal (0 to > 2 V)
SSHBC/EN
Disable supply
V
en(IC)(EN)
EnableIc
C
ss(HBC)
V
en(PFC)(EN)
EnableIcPfc
To soft start
circuit
TEA1716
aaa-000769
Fig 4. Circuit configuration around pin SSHBC/EN
7.5 IC protection
7.5.1 IC restart and shut-down
In addition to the protection functions that influence the operation of the PFC and HBC
controllers, a number of protection functions are provided that disable both controllers.
See the protection overview in Section 7.9 for details on which protections trigger a restart
or a protection shut-down.
• Restart
When the TEA1716 enters the Restart state, the PFC and HBC controllers are
switched off. After a period, defined by the Restart timer, the IC automatically restarts
following the normal start-up cycle.
• Protection shut-down
When the TEA1716 enters the Protection shut-down state, the PFC and HBC
controllers are switched off. The Protection shut-down state is latched, so the IC does
not start up again automatically. It can be restarted by resetting the Protection
shut-down state in one of the following ways:
– by lowering VSUPIC and VSUPHV below their respective reset levels, Vrst(SUPIC) and
Vrst(SUPHV)
– via a fast shut-down reset (see Section 7.5.3).
– via the enable pin (see Section 7.4)
• Thermal hold
In the Thermal hold state, the PFC and HBC controllers are switched off. The Thermal
hold state remains active until the IC junction temperature drops to about 10 C below
Totp (see Section 7.5.6).
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
12 of 46
ETC [ ETC ]
