AN10907
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© NXP B.V. 2010. All rights reserved.
Application note
Rev. 1 — 28 December 2010
4 of 82
NXP Semiconductors
AN10907
TEA1613T resonant power supply control IC
2. TEA1613T highlights and features
2.1 Resonant conversion
Today’s market demands high quality, reliable, small, lightweight and efficient power
supplies.
In principle, the higher the operating frequency, the smaller and lighter the transformers,
filter inductors and capacitors can be. On the other hand, the core, switching and winding
losses of the transformer increases at higher frequencies and become dominant. This
effect reduces efficiency at high frequencies, which limits the minimum size of the
transformer.
The corner frequency of the output filter usually determines the bandwidth of the control
loop. A well-chosen corner frequency allows high operating frequencies for achieving a
fast dynamic response.
Pulse-Width Modulated (PWM) power converters, such as flyback, up- and down
converters, are widely used in low and medium power applications. A disadvantage of
these converters is that the PWM rectangular voltage and current waveforms cause
turn-on and turn-off losses that limit the operating frequency. The rectangular waveforms
also generate broadband electromagnetic energy that can produce ElectroMagnetic
Interference (EMI).
A resonant DC-DC converter produces sinusoidal waveforms and reduces the switching
losses, which allows it to operate at higher frequencies.
Recent environmental considerations have resulted in a need for high efficiency
performance at low loads. Burst-mode operation of the resonant converter can provide
this if the converter is to remain active as for adapter applications.
Resonant conversion provides the following benefits:
•
High power
•
High efficiency
•
EMI friendly
•
Compact
2.2 General features
•
Universal mains supply operation
•
High level of integration, resulting in a low external component count and a cost
effective design
•
Enable input
•
On-chip high-voltage start-up source
•
Stand-alone operation or IC supply from external DC supply
