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200W digital-power solution for LED televisions

STMicroelectronics' STEVAL-NRG011TV board is intended to help designers build 200W digital power supplies and adapters for LED and OLED televisions that are able to exceed the toughest energy-efficiency and standby regulations.

Based on ST’s STNRG011 digital PFC (power-factor correction) and resonant LLC converter, the STEVAL-NRG011TV combines a reliable topology with the ability to configure and fine-tune the operating parameters for optimal performance. No coding is needed as the digital control algorithms are permanently programmed in the controller’s ROM and the board comes with a complete set of sample parameters stored in programmable non-volatile memory (NVM).

The STEVAL-NRG011TV provides a 12V/4A regulated output to power the television’s controller and audio subsystem and a 65V/2.5A output for LED backlighting. The wide AC input-voltage range, from 90V to 264V, allows use in power supplies and adapters to be marketed worldwide. The performance is claimed to go beyond today’s highest eco-design specifications, achieving full-load efficiency over 91% at 115V and 230V AC and no-load mains consumption below 120mW.

The STNRG011 provides a highly integrated solution for power-factor-corrected, high-efficiency converters. Included on-chip is an 8-bit CPU subsystem, control logic including PFC and LLC event-driven state machines (SMEDs), an analogue-to-digital converter (ADC), high-voltage startup circuitry, power management, and protection.

A two-wire interface handles communication with the external EEPROM as well as remote monitoring and software updates.

Housed in a 20-pin SO20 power package, this device enables a simplified board layout and compact dimensions.

Author
Neil Tyler

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