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TEA1533AT データシート(PDF) 9 Page - NXP Semiconductors

部品番号 TEA1533AT
部品情報  GreenChipTMII SMPS control IC
Download  24 Pages
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メーカー  PHILIPS [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1533AT データシート(HTML) 9 Page - NXP Semiconductors

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2002 Aug 23
9
Philips Semiconductors
Product specification
GreenChipTMII SMPS control IC
TEA1533T; TEA1533AT
handbook, full pagewidth
drain
secondary
stroke
MGU235
secondary
ringing
primary
stroke
valley
BA
secondary
stroke
oscillator
A: Start of new cycle at lowest drain voltage.
B: Start of new cycle in a classical PWM system at high drain voltage.
Fig.8 Signals for valley switching.
OverCurrent Protection (OCP)
The cycle-by-cycle peak drain current limit circuit uses the
external source resistor to measure the current accurately.
This allows optimum size determination of the transformer
core (cost issue). The circuit is activated after the leading
edge blanking time, tleb. The OCP circuit limits the ‘sense’
voltage to an internal level.
OverPower Protection (OPP)
During the primary stroke, the rectified mains input voltage
is measured by sensing the current drawn from pin DEM.
This current is dependent on the mains voltage, according
to the following formula:
where:
The current information is used to adjust the peak drain
current, which is measured via pin Isense. The internal
compensation is such that an almost mains independent
maximum output power can be realized.
The OPP curve is given in Fig.9.
I
DEM
V
aux
R
DEM
---------------
NV
mains
×
R
DEM
--------------------------
≈≈
N
N
aux
N
p
------------
=


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