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TEA1533P View Datasheet(PDF) - Philips Electronics

Part Name
Description
Manufacturer
TEA1533P
Philips
Philips Electronics Philips
TEA1533P Datasheet PDF : 24 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Philips Semiconductors
GreenChipTMII SMPS control IC
Product specification
TEA1533P; TEA1533AP
handbook, full pagewidth
CTRL
1.5 V VCTRL current
comparator
DRIVER
X2
DRIVER
Isense
Vx
150 mV
V
OSCILLATOR
I
fosc
fmax
fmin
dV2
cycle
skipping
1
0
dV1
Vx (mV)
150
Vx (mV)
MGU510
The voltage levels dV1 and dV2 are fixed in the IC to 50 mV (typical) and 18 mV (typical) respectively.
Fig.7 The cycle skipping circuitry.
Demagnetization
The system will be in discontinuous conduction mode all
the time. The oscillator will not start a new primary stroke
until the secondary stroke has ended.
Demagnetization features a cycle-by-cycle output
short-circuit protection by immediately lowering the
frequency (longer off-time), thereby reducing the power
level.
Demagnetization recognition is suppressed during the first
tsuppr time. This suppression may be necessary in
applications where the transformer has a large leakage
inductance, at low output voltages and at start-up.
If pin DEM is open-circuit or not connected, a fault
condition is assumed and the converter will stop operating
immediately. Operation will recommence as soon as the
fault condition is removed.
If pin DEM is shorted to ground, again a fault condition is
assumed and the converter will stop operating after the
first stroke. The converter will subsequently enter the safe
restart mode. This situation will persist until the
short-circuit is removed.
Minimum and maximum ‘on-time’
The minimum ‘on-time’ of the SMPS is determined by the
Leading Edge Blanking (LEB) time. The IC limits the
‘on-time’ to 50 µs. When the system desires an ‘on-time’
longer than 50 µs, a fault condition is assumed (e.g.
removed Ci in Fig.11), the IC will stop switching and enter
the safe restart mode.
2002 Aug 23
7
 

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