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TEA1533AT データシート(PDF) 8 Page - NXP Semiconductors

部品番号 TEA1533AT
部品情報  GreenChipTMII SMPS control IC
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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) 8 Page - NXP Semiconductors

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2002 Aug 23
8
Philips Semiconductors
Product specification
GreenChipTMII SMPS control IC
TEA1533T; TEA1533AT
OverVoltage Protection (OVP)
An OVP mode is implemented in the GreenChip series.
This works for the TEA1533 by sensing the auxiliary
voltage via the current flowing into pin DEM during the
secondary stroke. The auxiliary winding voltage is a
well-defined replica of the output voltage. Any voltage
spikes are averaged by an internal filter.
If the output voltage exceeds the OVP trip level, an internal
counter starts counting subsequent OVP events. The
counter has been added to prevent incorrect OVP
detections which might occur during ESD or lightning
events. If the output voltage exceeds the OVP trip level a
few times and not again in a subsequent cycle, the internal
counter will count down with twice the speed compared
with counting up. However, when typical 10 cycles of
subsequent OVP events are detected, the IC assumes a
true OVP and the OVP circuit switches the power
MOSFET off. Next, the controller waits until the UVLO
level is reached on pin VCC. When VCC drops to UVLO,
capacitor CVCC will be recharged to the Vstart level.
Regarding the TEA1533T, this IC will not start switching
again. Subsequently, VCC will drop again to the UVLO
level, etc. Operation only recommences when the VCC
voltage drops below a level of approximately 4.5 V
(practically when Vmains has been disconnected for a short
period).
Regarding the TEA1533AT, switching starts again (safe
restart mode) when the Vstart level is reached. This
process is repeated as long as the OVP condition exists.
The output voltage Vo(OVP) at which the OVP function trips,
can be set by the demagnetization resistor, RDEM:
where Ns is the number of secondary turns and Naux is the
number of auxiliary turns of the transformer.
Current I(OVP)(DEM) is internally trimmed.
The value of RDEM can be adjusted to the turns ratio of the
transformer, thus making an accurate OVP possible.
Valley switching
A new cycle starts when the power MOSFET is switched
on (see Fig.8). After the ‘on-time’ (which is determined by
the ‘sense’ voltage and the internal control voltage), the
switch is opened and the secondary stroke starts. After the
secondary stroke, the drain voltage shows an oscillation
with a frequency of approximately
where Lp is the primary self inductance of the transformer
and Cd is the capacitance on the drain node.
As soon as the oscillator voltage is high again and the
secondary stroke has ended, the circuit waits for the
lowest drain voltage before starting a new primary stroke.
This method is called valley detection. Figure 8 shows the
drain voltage together with the valley signal, the signal
indicating the secondary stroke and the oscillator signal.
In an optimum design, the reflected secondary voltage on
the primary side will force the drain voltage to zero. Thus,
zero voltage switching is very possible, preventing large
capacitive switching losses
and
allowing high frequency operation, which results in small
and cost effective inductors.
V
o OVP
()
N
s
N
aux
----------- I(OVP)(DEM) RDEM
×
V
clamp(DEM)(pos)
+
{}
=
1
2
π
×
L
p
C
d
×
()
×
-----------------------------------------------
P
1
2
---
CV
2
×
f
×
×
=




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