Single stage architecture increases efficiency of display power supplies

March 21, 2019 //By Nick Flaherty
Single stage architecture increases efficiency of display power supplies
Power Integrations has launched a single stage chipset for LED backlight power supplies that increases efficiency to over 91 percent.

The Innomax power architecture reduces losses in display applications by increasing overall efficiency in constant-voltage and constant-current LED backlight driver stages by 50% compared to conventional solutions. This also cuts the component count of TV and monitor designs by half, reducing manufacturing cost and providing an associated improvement in board reliability.

The chipset consists of an InnoMux controller IC partnered with an InnoSwitch3-MX isolated flyback switcher that combines the primary FET, primary-side controller, a secondary-side controller for synchronous rectification. The switcher also includes FluxLink high-speed communications technology, which eliminates the need for an optocoupler. 

The InnoSwitch3-MX receives control information from the InnoMux IC, which independently measures the load requirements of each output and directs the InnoSwitch3-MX switcher to deliver the right amount of power to each of the outputs to maintain accurate regulation of current or voltage; this eliminates the load and cross-regulation challenges seen with conventional multi-output power supplies, making post-regulators unnecessary. Overall power conversion efficiency increases by 10%, removing the need for heatsinks and eliminating hotspots while easing compliance with the upcoming ENERGY STAR 8.0 display specification and the new CEC power-consumption standard scheduled to take effect in July 2019.

InnoMux supports both accurately regulated constant-current and constant-voltage outputs simultaneously, supplying one to four channels of constant-current and up to two constant-voltage outputs. This flexibility supports the logic, audio and LED requirements typically seen in TV and monitor displays. The IC provides overload protection for each output. InnoMux technology also supports sophisticated dimming on the LED CC output - analog, PWM, interleaved and hybrid dimming are controlled via dedicated analog and PWM control pins, allowing accurate dimming down to 1.5%.

“Developers can leverage InnoMux’s power conversion efficiency in two ways: they can develop highly efficient monitors and TVs to meet manufacturer targets and regional regulatory mandates, or they can downgrade the efficacy, and therefore the cost, of their display panel by using less expensive LEDs and simpler, cheaper, diffusers while still meeting upcoming ENERGY STAR 8.0 rules,” said Edward

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