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TEA1623P датащи(PDF) 7 Page - NXP Semiconductors

номер детали TEA1623P
подробное описание детали  STARplug switched mode power supply controller IC
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производитель  NXP [NXP Semiconductors]
домашняя страница  http://www.nxp.com
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TEA1623P датащи(HTML) 7 Page - NXP Semiconductors

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TEA1623P_TEA1623PH
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 3 — 30 August 2010
7 of 20
NXP Semiconductors
TEA1623P; TEA1623PH
STARplug switched mode power supply controller IC
8.5 Demagnetization
The system operates in discontinuous conduction mode all the time. As long as the
secondary stroke has not ended, the oscillator will not start a new primary stroke. During
the suppression time tsuppr, demagnetization recognition is suppressed. This suppression
may be necessary in applications where the transformer has a large leakage inductance
and at low output voltages.
A: Start of new cycle with valley switching.
B: Start of new cycle in a classical PWM system.
Fig 5.
Signals for valley switching
Reflected voltage at N
× V
o =80V.
Fig 6.
Typical phase of drain ringing at switch-on
col007
drain
valley
secondary
ringing
secondary
stroke
primary
stroke
secondary
stroke
RC
oscillator
regulation level
A
B
f (kHz)
0
800
600
200
400
001aaa311
0
−20
20
40
phase
(
°)
−40


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