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Power Electronics Europe News
 
Infineon uses hybrid technology for DC/DC buck LED driver IC

The IC has a supply voltage range of 8.0 up to 80V DC and provides a high safety voltage margin for applications operating close to safe extra-low voltage (SELV) limits, claims the company. The driver IC is suitable for general and professional LED lighting applications with high dimming requirements.

The dimming performance is without flicker and prevents audible noise, continues the company. A PWM input signal between 250Hz and 20kHz controls the LED current in analogue dimming output mode from 100 to 12.5% and from 12.5 to 0.5% in hybrid dimming mode, with a flicker-free modulation frequency of 3.4kHz. The digital PWM dimming detection with high resolution and the low power shutdown matches the LED driver IC to microcontrollers. The device also has a dim-to-off function and a pull-down transistor to avoid LED glowing in dim-to-off mode.

The IC drives up to 1.5A using a high-side integrated switch, with a low RDS(on) of 290 milli Ohm (the ILD8150) enables high power designs with an efficiency of more than 95%. A soft-start function protects the primary stage from abrupt current requests and a shunt resistor for adjustable maximum output current. Precise output current accuracy of typical 3% from one device to another under all load and input voltage conditions makes the IC suitable for tunable white and flat panel designs where current must be identical. Additionally, under voltage lockout (UVLO) for the bootstrap voltage and over temperature protection functions are suitable for professional LED lighting solutions.

The LED driver IC is packaged in a DSO-8 housing which enables wave soldering. Higher thermal performance can be achieved with the ILD8150E in a DSO-8 package with an exposed pad, advises Infineon.



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