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TEA1750_2
?NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02  15 December 2008
24 of 29
NXP Semiconductors
TEA1750
GreenChip III SMPS control IC
[1]   For a typical application with a compensation network on pin PFCCOMP, like the example in
Figure
3.
[2]   Typically 120 mV above V
stop(fb)
.
[3]   Minimum required voltage change time for valley recognition on pin PFCAUX.
[4]   Minimum required time between demagnetization recognition and V/t end.
[5]   Guaranteed by design.
11. Application information
Apower supply with the TEA1750 consists of a power factor correction circuit followed by
a yback converter. See
Figure
14.
Capacitor C
VCC
 buffers the IC supply voltage, which is powered via the high voltage
rectied mains during start-up and via the auxiliary winding of the yback 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
dene the maximum primary peak current in MOSFETs S1 and S2.
In the example given, the LATCH pin is connected to a Negative Temperature Coefcient
(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. For
applications with high transformer ringing frequencies (after the secondary stroke), the
PFCAUX pin should be connected via a capacitor and a resistor to the auxiliary winding. A
diode must than be placed from the ground connection to the PFCAUX pin.
Temperature protection
T
pl(IC)
IC protection level
temperature
130
140
150
癈
T
pl(IC)hys
hysteresis of IC protection
level temperature
-
10
-
癈
Table 5.
Characteristics &continued
T
amb
= 25 癈; V
CC
= 20 V; all voltages are measured with respect to ground (pin 2); currents are positive when owing into
the IC; unless otherwise specied.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
V
prot LATCH
(
)
I
O LATCH
(
)
--------------------------------    15.6 k&
=
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