tea1553t NXP Semiconductors, tea1553t Datasheet - Page 22

• Manufacturer Part Number: tea1553t
• Description: Tea1553t Greenchip Ii Smps Control Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
11. Application information
TEA1553T_1
Product data sheet
Fig 14. Application diagram of TEA1553T with controlled PFC
(1) The LOCK pin is used in this example for an additional external overtemperature protection. If this pin is not used, it must be
tied to ground.
V MAINS
A converter using the TEA1553T consists of an input filter, a transformer with a third
winding (auxiliary), and an output stage with a feedback circuit.
Capacitor C
high voltage rectified mains during start-up and via the auxiliary winding during operation.
A sense resistor converts the primary current into a voltage at pin ISENSE (pin 3). The
value of this sense resistor defines the maximum primary peak current.
10
11
12
13
14
15
16
9
VCC
VCC
n.c.
GND
VCC5V
LOCK
CTRL
CSTART
DEM
(at pin 9) buffers the supply voltage of the IC, which is powered via the
TEA1553T
OVPFCAP
VCOADJ
DRIVER
ISENSE
STDBY
DRAIN
HVS
HVS
Rev. 01 — 3 July 2007
R DEM
8
7
6
5
4
3
2
1
RS2
PFC
CSS
RSS
POWER
MOSFET
R SENSE
GreenChip II SMPS control IC
TEA1553T
014aaa013
OUTPUT
© NXP B.V. 2007. All rights reserved.
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