Meeting The Standby Power Specification In LED TVs With A Single Power Supply
by Jean-Paul Louvel, ON Semiconductor, Toulouse, France, How2Power Today, Jun 15 2016
Focus:
The addition of new features is making it harder to meet requirements for low standby power
consumption in LED TVs, while using a single switched-mode power supply (with no separate
standby power supply.) However, new power supply controller ICs from ON Semiconductor
incorporate numerous features to help reduce standby power consumption. This article discusses
the benefits of these secondary- and primary-side controllers (NCP4328, NCP4352, NCP1249,
NCP1256, NCP1239, NCP4354/55 and NCP1399) to the flyback converters used in power supplies up
to 100 W (for screen sizes up to 42 inches) and in the LLC converters used at high power levels
(for larger screen sizes.) Features include Eco and off modes that allow for different levels
of voltage regulation in active and standby modes, active X2 capacitor discharge, high-voltage
startup, special skip modes and the ability to disable the PFC stage. Article begins with an
overview of the electrical and safety requirements in LED TV power supplies.
What you’ll learn:
- How to reduce standby power consumption in flyback and LLC converters used in LED TV power supplies
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