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TEA19162CT/1J

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
TEA19162T All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet Rev. 1 — 10 March 2016 7 of 30
NXP Semiconductors
TEA19162T
PFC controller
When V
SUPIC
<V
uvp(SUPIC)
, the PFC controller stops switching immediately.
7.3 Protections
Table 3 gives an overview of the available protections.
[1] At start-up, the PFC disables the LLC converter until the mains voltage exceeds the brownin level.
[2] Some protections also disable the LLC (see Section 7.5.1
).
7.3.1 Internal OverTemperature Protection (OTP)
An accurate internal temperature protection is provided in the circuit. When the junction
temperature exceeds the thermal shutdown temperature (T
pl(IC)
), the IC stops switching.
The internal overtemperature protection is a latched protection. It also disables the LLC
converter by pulling down the SNSBOOST pin.
Table 3. Protections overview
Protection Description Action LLC
[2]
UVP-SUPIC undervoltage protection
SUPIC
PFC = off;
restart when V
SUPIC
>V
start(SUPIC)
;
SNSBOOST pulled low, disabling the LLC.
off Section 7.2
OTP-internal internal overtemperature
protection
latched; SNSBOOST pulled low, disabling
the LLC.
off Section 7.3.1
OTP-external external overtemperature
protection
latched; SNSBOOST pulled low, disabling
the LLC.
off Section 7.3.2
brownout-mains undervoltage protection
mains
PFC = off; restart when I
SNSMAINS
>I
bi
[1]
- Section 7.3.2
SoftStop-OVP-
SNSBOOST
overvoltage protection boost
voltage followed by a soft stop
PFC = off via soft stop;
restart when V
SNSBOOST
<V
ovp(start)
- Section 7.3.3
OVP-
SNSBOOST
overvoltage protection boost
voltage
PFC = off; restart when
V
SNSBOOST
<V
ovp(SNSBOOST)
- Section 7.3.4
SCP-SNSBOOST short-circuit protection PFC = off;
restart when V
SNSBOOST
>V
scp(start)
- Section 7.3.5
OLP-PFC open-loop protection PFC = off;
restart when V
SNSBOOST
>V
scp(start)
- Section 7.3.5
OCP overcurrent protection PFC MOSFET switched off,
continue operation
- Section 7.3.6
TEA19162T All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet Rev. 1 — 10 March 2016 8 of 30
NXP Semiconductors
TEA19162T
PFC controller
7.3.2 Brownin/brownout and external overtemperature protection
On the TEA19162T, the mains measurement and external temperature are combined at
the SNSMAINS pin (see Figure 5
).
At t1, the voltage at the SNSMAINS pin is internally regulated to V
regd(SNSMAINS)
(250 mV).
The current into the SNSMAINS pin is a measure of the system input mains voltage. The
TEA19162T continuously measures the SNSMAINS current and waits until it detects a
peak in the measured current (t2). This peak current value is internally stored and used as
an input for the brownout/brownin detection and the mains compensation.
When, at t3, the current into the SNSMAINS pin is well below the brownin level
(< I
en(NTC)
), the controller starts to measure the value of the external NTC. The external
NTC is measured by sourcing a current (I
o(SNSMAINS)
) out of the SNSMAINS pin. When,
after a maximum measuring time of t
det(NTC)max
(1 ms), the voltage remains below
V
det(SNSMAINS)
during four consecutive NTC measurements, the OTP protection is
triggered (t5).
To prevent the PFC from operating at very low mains input voltages, the PFC stops
switching when the measured peak current drops to below I
bo
. When the measured
current exceeds I
bi
, the PFC restarts with a soft start.
7.3.3 Soft stop overvoltage protection (SNSBOOST pin)
When the SNSBOOST voltage is between the V
det(L)SNSBOOST
and V
det(H)SNSBOOST
, the
TEA19162T stops switching via a soft stop. The TEA19161T uses this function to force
the TEA19162T to operate in burst mode with a specific duty cycle (see Section 7.5.2
).
Audible noise is avoided because at the end of a switching period, the PFC stops via a
soft stop. After an OVP event, the system always starts via a soft start.
Fig 5. Mains and external OTP measurement
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TEA19162T All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2016. All rights reserved.
Product data sheet Rev. 1 — 10 March 2016 9 of 30
NXP Semiconductors
TEA19162T
PFC controller
7.3.4 Overvoltage protection (SNSBOOST pin)
To prevent output overvoltage during load steps and mains transients, an overvoltage
protection circuit is built in.
When the voltage on the SNSBOOST pin exceeds the V
ovp(stop)
level and is outside the
V
det(L)SNSBOOST
and V
det(H)SNSBOOST
window for a minimum period of t
d(ovp)
(100 s),
switching of the power factor correction circuit is inhibited. When the SNSBOOST pin
voltage drops to below the V
ovp(start)
(V
ovp(stop)
V
hys(ovp)
) level again, the switching of the
PFC recommences. The IC always restarts with a soft start (see Section 7.4.1
).
7.3.5 PFC open-loop protection (VOSENSE pin)
The PFC does not start switching until the voltage on the SNSBOOST pin exceeds
V
scp(start)
. This function acts as short circuit protection for the boost voltage
(SCP-SNSBOOST; see Table 3
).
7.3.6 Overcurrent protection (PFCSENSE pin)
Sensing the voltage across an external sense resistor, R
sense
, on the source of the
external MOSFET, limits the maximum peak current cycle-by-cycle. The voltage is
measured via the SNSCUR pin.
7.3.7 Fast latch reset
The restart of the system after a protection is triggered depends on the type of protection.
In a safe restart protection (only applicable for the LLC), the system typically restarts after
the restart delay time (1 sec).
It is different for latched protections. Typically, in a latched protection, the SUPIC must
reach the undervoltage protection level to release the protection mode and to restart the
system. The release/restart can only be achieved by disconnecting the mains.
In the protection mode, the TEA19161T/TEA19161CT regulates the voltage of the SUPIC
pin to its start level. The PFC output capacitor supplies the SUPIC pin via the SUPHV pin
of the TEA19161T/TEA19161CT. So it takes a long time before the voltage of the SUPIC
pin drops below its undervoltage level after the mains is disconnected. To prevent this
delay, a special fast latch reset function is implemented in the TEA19162T, which also
releases the protection mode when the mains is reconnected.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30

TEA19162CT/1J

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Buy TEA19162CT/1J
Manufacturer:
NXP Semiconductors
Description:
Power Factor Correction - PFC TEA19162CT/SO8//1/REEL 13 Q1 NDP
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