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TEA1723DT Datasheet(PDF) 4 Page - NXP Semiconductors

No. de pieza TEA1723DT
Descripción Electrónicos  HV start-up flyback controller with integrated MOSFET for 11 W applications, 1270 Hz burst frequency
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Fabricante Electrónico  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
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TEA1723DT Datasheet(HTML) 4 Page - NXP Semiconductors

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TEA1723DT
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 2.1 — 7 June 2012
4 of 14
NXP Semiconductors
TEA1723DT
HV start-up flyback controller with integrated MOSFET for 11 W
4.
Pinning information
4.1 Pinning
4.2 Pin description
5.
Functional description
5.1 Start-up
The TEA1723 starts up by charging the VCC capacitor until the VCC(start) level. The
charging current flows from the high voltage DRAIN pin via an internal start-up current
source to the VCC pin.
Once the start level has been reached the start-up current source is switched off. During
switching operation, the start-up current source remains current-less and has zero
bleeder loss.
5.2 Primary sensing
The FB input senses the reflected secondary voltage on the primary side. The FB input
has a sample and hold function that samples the FB voltage on the secondary stroke to
control the output voltage.
The sampled VFBS voltage is the input for the TEA1723’s control loop and defines the
operating mode.
Fig 2.
Pinning top view
TEA1723
GND1
DRAIN
GND2
GND3
SOURCE
FB
VCC
001aao249
1
2
3
4
6
5
7
Pin
Pin name
I/O type
Pin description
1
GND1
ground
2
GND2
ground
3
GND3
ground
4
FB
I
feedback input for voltage sensing
5
VCC
I
supply input
6
SOURCE
O
source for power switch
7
DRAIN
I
drain of power switch
-
-
high voltage spacer


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