80V DC/DC buck LED driver IC uses hybrid dimming technology

Based on a hybrid dimming mode technology, the ILD8150/E is an LED driver IC from Infineon Technologies. The dimming mode technology achieves 0.5 per cent of the target current, says Infineon. It has a supply voltage range from 8.0 to 80V DC to provide a high safety voltage margin for applications operating close to safe extra-low voltage (SELV) limits.

The ILD8150/E offers a deep dimming performance without flicker and prevents audible noise, continues Infineon. A PWM input signal between 250Hz and 20kHz controls the LED current in analogue dimming output mode from 100 to 12.5 per cent and from 12.5 to 0.5 per cent 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 match the ILD8150/E to microcontrollers. It also has a dim-to-off function and a pull-down transistor to avoid LED glowing in dim-to-off mode.

Infineon’s ILD8150/E drives up to 1.5A using a high-side integrated switch. The latter one with a low RDS(on) of 290 milli Ohm (ILD8150) enables high power designs with an efficiency of more than 95 per cent, says Infineon. It incorporates a soft-start function to protect the primary stage from abrupt current requests and a shunt resistor for adjustable maximum output current. Precise output current accuracy of typically three per cent 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. The IC also has under-voltage lockout (UVLO) for the bootstrap voltage and over temperature protection.

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, adds Infineon. Both variants can be ordered now.


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