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High-accuracy CV/CC operation

A family of safety-isolated LED-driver ICs for smart lighting applications has been launched by Power Integrations.

The LYTSwitch-6 range aims to deliver flicker-free output up to 65W. According to Power Integrations, the devices also feature up to 94% efficiency and 15mW standby power, with configuration options for two-stage or single-stage PFC support.

Power Integrations adds that the ICs exhibit fast transient response, which facilitates excellent cross regulation performance of parallel LED strings without additional regulator hardware and allows easy-implementation of a pulse-width-modulation dimming interface.

LYTSwitch-6 ICs includes constant-voltage (CV) and constant-current (CC) operation. The ICs are said to be protected by an advanced thermal foldback system, which is designed to prevent overheating while delivering as much light as thermally possible in any circumstance or installation.

Featuring a built-in 650 V or 725 V MOSFET and secondary-side FluxLink, need for an optocoupler is eliminated. This should also provide accurate output with better than 3% CV and CC over line, load and temperature.

Power Integrations claims the power conversion for the flyback stage is more than 94% efficient, which is achieved by using synchronous rectification and quasi-resonant switching. This is said to enable high power output without a heatsink.

The devices also should offer low standby power, even with line voltage sensing.

Bethan Grylls

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