tea1753lt NXP Semiconductors, tea1753lt Datasheet - Page 26

• Manufacturer Part Number: tea1753lt
• Description: Tea1753lt Greenchip Iii Smps Control Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
11. Application information
TEA1753LT
Objective data sheet
A power supply with the TEA1753LT consists of a power factor correction circuit followed
by a flyback converter. See
Capacitor C
rectified mains during start-up and via the auxiliary winding of the flyback converter during
operation. Sense resistors R
MOSFETs S1 and S2 into a voltage at pins PFCSENSE and FBSENSE. The values of
R
In the example given, the LATCH pin is connected to a Negative Temperature Coefficient
(NTC) resistor. The protection is activated when the resistance drops below a value as
calculated below.
A capacitor C
time-out protection is activated after 10 ms. R
does not interfere with the normal regulation loop.
R
normal operation due to negative voltage spikes across the sense resistors.
Resistor R
V
-------------------------------
Fig 17. Typical application diagram for the TEA1753LT IC
SENSE1
I
S1
prot LATCH
O LATCH

and R

and R

S2
AUX1

VCC
are added to prevent the soft start capacitors from being charged during
=
TIMEOUT
SENSE2
is added to protect the IC from damage during lightning events.
All information provided in this document is subject to legal disclaimers.
15.6 k
buffers the IC supply voltage, which is powered via the high voltage
is connected to the FBCTRL pin. For a 120 nF capacitor, the
define the maximum primary peak current in MOSFETS S1 and S2.
Rev. 01 — 4 March 2011
Figure
SENSE1
8
6
7
3
12
17.
and R
11
TEA1753LT
SENSE2
2
LOOP
9
convert the current through the
is added so that the time-out capacitor
16 13
10
4
1
5
GreenChip III SMPS control IC
TEA1753LT
© NXP B.V. 2011. All rights reserved.
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