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TEA1751T_LT_2
?NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02  23 December 2009
18 of 29
NXP Semiconductors
TEA1751T; TEA1751LT
GreenChip III SMPS control IC
subsequent OVP events are detected, the IC assumes a true OVP and the OVP circuit
switches the power MOSFET off. As the protection is latched, the converter only restarts
after the internal latch is reset. In a typical application the mains should be interrupted to
reset the internal latch.
The output voltage V
o(OVP)
 at which the OVP function trips, can be set by the
demagnetization resistor, R
FBAUX
:
where N
s
 is the number of secondary turns and N
aux
 is the number of auxiliary turns of the
transformer. Current I
ovp(FBAUX)
 is internally trimmed.
The value of R
FBAUX
 can be adjusted to the turns ratio of the transformer, thus making an
accurate OVP detection possible.
7.3.9   Overcurrent protection (FBSENSE pin)
The primary peak current in the transformer is measured accurately cycle-by-cycle using
the external sense resistor R
sense2
. The OCP circuit limits the voltage on pin FBSENSE to
an internal level (see also Section 7.3.3
). The OCP detection is suppressed during the
leading edge blanking period, t
leb
, to prevent false triggering caused by switch-on spikes.
 
7.3.10   Overpower protection
During the primary stroke of the flyback converter the input voltage of the flyback
converter is measured by sensing the current that is drawn from the pin FBAUX.
The current information is used to adjust the peak drain current of the flyback converter,
which is measured via pin FBSENSE. The internal compensation is such that an almost
input voltage independent maximum output power can be realized.
The OPP curve is given in Figure 16
.
V
o OVP
(
)
N
s
N
aux
----------- I
ovp FBaux
(
)
R
FBaux
?/DIV>
V
clamp FBAUX
(
)
+
(
)
=
Fig 15.   OCP leading edge blanking
LEB (t
leb
)
OCP LEVEL
V
FBSENSE
t
014aaa022
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