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PDF TEA1532AT Data sheet ( Hoja de datos )

Número de pieza TEA1532AT
Descripción GreenChip SMPS control IC
Fabricantes NXP Semiconductors 
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TEA1532(A)P; TEA1532(A)T
GreenChipII SMPS control IC
Rev. 02 — 4 February 2005
Product data sheet
1. General description
The GreenChip™II is the second generation of green Switched Mode Power Supply
(SMPS) controller ICs. Its high level of integration allows the design of a cost effective
power supply with a very low number of external components.
The TEA1532(A)P; TEA1532(A)T can also be used in fixed frequency, Continuous
Conduction Mode (CCM) converter designs for low voltage, high current applications. At
low power (standby) levels, the system operates in cycle skipping mode which minimizes
the switching losses during standby.
The special built-in green functions allow the efficiency to be optimum at all power levels.
This holds for quasi-resonant operation at high power levels, as well as fixed frequency
operation with valley switching at medium power levels. At low power (standby) levels, the
system operates in cycle skipping mode with valley detection.
The proprietary high voltage BCD800 process makes direct start-up possible from the
rectified universal mains voltage in an effective and green way. A second low voltage
BICMOS IC is used for accurate, high speed protection functions and control.
The TEA1532(A)P; TEA1532(A)T enables highly efficient and reliable supplies to be
designed easily.
2. Features
2.1 Distinctive features
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s Universal mains supply operation (70 V to 276 V AC)
s High level of integration, resulting in a very low external component count
s Fixed frequency Continuous Conduction Mode (CCM) operation capability
s Quasi-Resonant (QR) Discontinuous Conduction Mode (DCM) operation capability.
2.2 Green features
s Valley or zero voltage switching for minimum switching losses in QR operation
s Cycle skipping mode at very low loads; input power < 300 mW at no-load operation for
a typical adapter application
s On-chip start-up current source.
2.3 Protection features
s Safe restart mode for system fault conditions
s Zero current switch-on in QR mode

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TEA1532AT pdf
Philips Semiconductors
TEA1532(A)P; TEA1532(A)T
GreenChipII SMPS control IC
Vi
CVIN
CVCC
18
2 TEA1532T 7
TEA1532AT
3 TEA1532P 6
TEA1532AP
45
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Fig 4. Typical configuration
coa015
The TEA1532(A)P; TEA1532(A)T can operate in multi modes; see Figure 5.
f
(kHz)
63
Cycle
skip
fixed
coa017
FF-CCM
QR
9397 750 14319
Product data sheet
P (W)
Fig 5. Multi mode and FF-CCM operation
In QR mode, the next converter stroke is started only after demagnetization of the
transformer current (zero current switching), while the drain voltage has reached the
lowest voltage to minimize switching losses (green function). The primary resonant circuit
of primary inductance and drain capacitor ensures this quasi-resonant operation. The
design can be optimized in such a way that zero voltage switching can extend over most of
the universal mains range.
To prevent very high frequency operation at lower loads, the quasi-resonant operation
changes smoothly in fixed frequency Pulse Width Modulation (PWM) control.
Rev. 02 — 4 February 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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TEA1532AT arduino
Philips Semiconductors
TEA1532(A)P; TEA1532(A)T
GreenChipII SMPS control IC
When pin DEM is grounded (CCM), the brown-out protection is disabled. In this case the
duty cycle is limited to 0.7, so at low mains voltage the on-time is limited and therefore the
dissipation in the FET is limited.
7.15 OverTemperature protection (OTP)
The IC provides accurate OTP. The IC will stop switching when the junction temperature
exceeds the thermal shutdown temperature. When VCC drops to VUVLO, capacitor CVCC
will be recharged to the Vstart level, however switching will not restart. Subsequently, VCC
will drop again to VUVLO, etc.
Operation only recommences when VCC drops below a level of about 4.5 V (typically,
when Vmains is disconnected for a short period).
7.16 Soft start-up (pin SENSE)
To prevent transformer rattle at start-up or during hiccup, the transformer peak current is
slowly increased by the soft start function. This can be achieved by inserting a resistor
and a capacitor between pin SENSE (pin 6) and sense resistor Rsense. An internal current
source charges the capacitor to Vsense = Iss × Rss (about 0.5 V maximum).
The start level and the time constant of the increasing primary current level can be
adjusted externally by changing the values of Rss and Css.
I primary(max)
=
V-----o--c--p---------(--I---s--s---×-----R----s--s--)-
Rsense
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τ = Rss × Css
During the start-up phase, the charging current Iss will flow as long as the voltage on
pin SENSE is below approximately 0.5 V. If the voltage on pin SENSE exceeds 0.5 V, the
soft start current source will start limiting current Iss. At Vstart, the Iss current source is
completely switched off; see Figure 9.
Since the soft start current Iss is subtracted from pin VCC charging current, the Rss value
will affect VCC charging current level by a maximum of 60 µA (typical).
0.5 V
Fig 9. Soft start-up
Iss
start-up
6 SENSE Rss
Vocp
Css
Rsense
mgu237
9397 750 14319
Product data sheet
Rev. 02 — 4 February 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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