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GreenChip Low-Power SMPS Controllers
(Power Electronics Technology Via Acquire Media NewsEdge) The NXP TEA172x
family is a series of small, low-cost module SMPS controller ICs
that operate directly from the rectified universal mains input and
are tailored for low-power applications up to 5, 8, or 11 W. Each
device is equipped with a high-voltage power MOSFET switch (700 V)
and is optimized for flyback, buck, and buck-boost converter
topologies. The result is high efficiency over the entire load
range. Power consumption in the no-load condition below 10 mW at 5
W, which exceeds the EPA 2.0 rating and the 5-star rating defined
by EnergyStar.
The architecture includes several features that serve to reduce
total component count, minimize the design footprint, and lower
overall cost. Primary side-sensing, which eliminates the need for a
power-consuming opto-coupler. The architecture meets EMI
specification without an external Y-cap, and integrated active HV
start-up eliminates resistor bleeder circuitry. Fewer than 30
external components are required for a complete bill of materials.
Advanced control modes enable very high average efficiency (above
77%) over the entire load range, and compliance with USB 1.1 and
1.2 makes them well suited for use in mobile phone charger
applications. Switching losses are kept low with a burst frequency
of 420 Hz, and a variety of protection features ensure reliable
operation under a wide range of conditions.
Design tools for the TEA172x family include a range of demo
boards, extensive application notes, and an online calculator that
helps predict real-world performance. the entire load range.
The TEA1721 supports operation up to 5 W and is ideally suited
for use in mobile USB chargers, major home appliances, and
industrial systems. The TEA1722, in development, supports
applications up to 8 W and is intended for smartphones and personal
consumer products. The TEA1723 runs at up to 11 W and targets
tablet PCs, e-readers, and set-top boxes (STBs). All three TEA172x
devices have the same feature set but use a different power MOSFET,
tailored for operation up to 5, 8, or 11 W, respectively.
The TEA172x architecture provides a circuit for start-up
directly from the rectified mains voltage without any external
bleeder circuits. The converter operates as a regulated voltage
source from no-load up to the maximum output current and operates
as a current source that delivers the maximum current over a broad
output voltage range.
© 2012 Penton Media
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