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TEA1751T_LT_2
?NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02  23 December 2009
25 of 29
NXP Semiconductors
TEA1751T; TEA1751LT
GreenChip III SMPS control IC
11. Application information
A power supply with the TEA1751(L)T consists of a power factor correction circuit
followed by a flyback converter. See Figure 16
.
Capacitor C
VCC
 buffers the IC supply voltage, which is powered via the high voltage
rectified mains during start-up and via the auxiliary winding of the flyback converter during
operation. Sense resistors R
SENSE1
 and R
SENSE2
 convert the current through the
MOSFETs S1 and S2 into a voltage at pins PFCSENSE and FBSENSE. The values of
R
SENSE1
 and R
SENSE2
 define the maximum primary peak current in MOSFETs S1 and S2.
In the example given, the LATCH pin is connected to a Negative Temperature Coefficient
 (NTC) resistor. When the resistance drops below
 (typ), the
protection is activated. A capacitor C
TIMEOUT
 is connected to the FBCTRL pin. For a
120 nF capacitor, typically after 10 ms the time-out protection is activated. R
LOOP
 is added
so that the time-out capacitor does not interfere with the normal regulation loop.
R
S1
 and R
S2
 are added to prevent the soft start capacitors from being charged during
normal operation due to negative voltage spikes across the sense resistors.
Resistor R
AUX1
 is added to protect the IC from damage during lightning events.
 
Fig 17.   Typical application diagram TEA1751(L)T
V
prot LATCH
(
)
I
O LATCH
(
)
-------------------------------
15.6 k?/SPAN>
=
12
11
9  16 13
8
6
7
3
2
10
4
1
TEA1751(L)T
014aaa302
?/DIV>
R
S2
R
SS2
C
SS2
D2
C
OUT
T2
R
AUX2
R
SENSE2
C
VCC
5
R
S1
C
bus
D1
S1
C
SS1
R
SS1
R
SENSE1
C
TIMEOUT
R
LOOP
COMPENSATION
R
AUX1
S2
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