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PDF TEA1532BT Data sheet ( Hoja de datos )
| Número de pieza | TEA1532BT | |
| Descripción | (TEA1532BT / TEA1532CT) GreenChip II SMPS control IC | |
| Fabricantes | NXP Semiconductors | |
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TEA1532BT; TEA1532CT
GreenChip II SMPS control IC
Rev. 01 — 18 January 2007
Product data sheet
1. General description
The GreenChip II is the second generation of controller ICs intended for green flyback
Switched Mode Power Supplies (SMPS). Its high level of integration allows the design of a
cost effective power supply with a very low number of external components.
The TEA1532BT; TEA1532CT can also be used in fixed frequency, Continuous
Conduction Mode (CCM) converter designs for low voltage and 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 energy efficient way. A second low
voltage, Bipolar CMOS (BICMOS) IC is used for accurate, high speed protection functions
and control.
The TEA1532BT; TEA1532CT enables highly efficient and reliable supplies to be
designed easily.
2. Features
2.1 Distinctive features
I Universal mains supply operation (70 V to 276 V AC)
I High level of integration resulting in a very low external component count
I Fixed frequency Continuous Conduction Mode (CCM) operation capability
I Quasi-Resonant (QR) Discontinuous Conduction Mode (DCM) operation capability
2.2 Green features
I Valley or zero voltage switching for minimum switching losses in QR operation
I Cycle skipping mode at very low loads; input power < 300 mW at no-load operation for
a typical adapter application
I On-chip start-up current source
2.3 Protection features
I Safe restart mode for system fault conditions
I Zero current switch-on in QR mode
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
NXP Semiconductors
TEA1532BT; TEA1532CT
GreenChip II SMPS control IC
Vi
CVIN
CVCC
18
27
TEA1532BT
3 TEA1532CT 6
45
coa048
Fig 3. Basic configuration
The TEA1532BT; TEA1532CT can operate in multi modes; see Figure 4.
f
(kHz)
125
Cycle
skip
fixed
FF-CCM
QR
P (W)
coa049
Fig 4. 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.
TEA1532BT_TEA1532CT_1
Product data sheet
Rev. 01 — 18 January 2007
© NXP B.V. 2007. All rights reserved.
5 of 23
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
www.DataSheet.co.kr
NXP Semiconductors
TEA1532BT; TEA1532CT
GreenChip II SMPS control IC
protection is reset. The latch is reset as soon as VCC drops below 4.5 V (typical value)
(this only occurs when the mains has been disconnected). The internal
overtemperature protection will also trigger this latch; see also Figure 1.
For the TEA1532BT the IC always enters the latched mode protection independent of the
voltage on pin CTRL.
A voltage higher than 3 V on pin PROTECT will always latch the IC. This is independent of
the state or the version of the IC.
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 Vth(UVLO), capacitor CVCC
will be recharged to the Vstartup level, however switching will not restart. Subsequently, VCC
will drop again to Vth(UVLO), 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 Brown-out protection
During the so called brown-out test, the input voltage is slowly decreased. Since the
on-time depends on Vi, long on-times at low Vi can damage the (external) power device.
This is prevented by stopping the converter when the input voltage drops too low.
When the voltage on pin DEM drops below −50 mV during the on-time (QR mode), the
maximum on-time is set to 25 µs. The maximum on-time will be reached while Vi is low.
Subsequently, the IC stops switching and VCC drops below Vth(UVLO). Capacitor CVCC will
only be recharged and the supply will restart only when voltage VI is high enough
(Vmains(oper)(en), also see Section 7.1). In addition to this, a VI level at which the converter
has to enter a safe restart can be set with a demagnetization resistor. During the primary
stroke, the rectified mains input voltage is measured by sensing the current drawn from
pin DEM. This current depends on the mains voltage, according to the following equation:
I DEM ≈ -R-V---D-a--E-u---Mx-- ≈ -N------×R----DV----E-m--M--a--i--n---s
Where: N = -N--N--a---up---x (ratio of the number of auxiliary to the number of primary windings)
The latter function requires an on-time of at least 2 µs. This on-time ensures that a reliable
demagnetization current can be measured.
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.
7.17 Driver
The driver circuit to the gate of the power MOSFET has a current sourcing capability of
typically 170 mA and a current sink capability of typically 700 mA. This permits fast
turn-on and turn-off of the power MOSFET for efficient operation.
TEA1532BT_TEA1532CT_1
Product data sheet
Rev. 01 — 18 January 2007
© NXP B.V. 2007. All rights reserved.
11 of 23
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
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