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SSL4120T датащи(PDF) 22 Page - NXP Semiconductors

номер детали SSL4120T
подробное описание детали  Resonant power supply control IC with PFC
PDF  47 Pages
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производитель  NXP [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo NXP - NXP Semiconductors

SSL4120T датащи(HTML) 22 Page - NXP Semiconductors

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SSL4120T
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Objective data sheet
Rev. 1 — 21 June 2012
22 of 47
NXP Semiconductors
SSL4120T
Resonant power supply control IC with PFC
The MOSFET will be forced to switch on if the half-bridge slope fails to start and the
oscillator voltage reaches Vu(CFMIN).
The switching frequency is increased to eliminate the problems associated with
Capacitive mode operation. This is explained in Section 7.8.11.
7.8.5 HBC slope controlled oscillator (pins CFMIN and RFMAX)
The slope-controlled oscillator determines the switching frequency of the half-bridge. The
oscillator generates a triangular waveform between Vu(CFMIN) and Vl(CFMIN) at the external
capacitor Cfmin.
Figure 12 shows how the frequency is determined.
Fig 11. Adaptive non-overlap time function (capacitive operation)
0
t
014aaa939
delayed
oscillator
delayed switch-on
during capacitive mode
no HB slope
wrong polarity
GATEHS
GATELS
0
VBoost
HB
0
0
0
ITr(HBC)
CFMIN



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