Rich technology introduced digital pulse dimming LED driver

Rich technology (RichTek Technology) launched series white LED driver RT9285 innovative design for white LED driver before, RT9285 provides the pulse dimming technology is simple, the system only needs to provide a wide and narrow different digital pulse, easy to realize the output brightness adjustment. It also integrates the Schottky diode (Diode), so that the number of external components of the system is less, less RF interference. While simplifying the circuit and software design of the whole system, it also provides the excellent performance of the electromagnetic interference.

The backlit LCD screen of portable electronic products are mainly white LED, white LED brightness with the current is proportional to the RT-9285 series of LED structure, the highest 5 white LED series can provide the required voltage, and can be connected in series with a resistor to set the maximum LED current function, including all the small size LCD screen and backlight. To ensure the consistency of LED brightness. In order to meet the needs of backlight with different brightness, RT-9285 provides pulse dimming technology, simplifies the design of the circuit, and provides the characteristics of the electromagnetic interference.

In addition to providing white LED drive current, the RT-9285 can also be used as an organic light emitting diode (OLED) power supply, through the resistance voltage setting, RT-9285 can provide rated voltage output as the OLED power supply.

The conversion efficiency of RT-9285 is up to 85%, which can reduce the current consumption and prolong the battery life. The built in Schottky diode reduces the components and the complexity of the system. Built in soft activation (Soft start) function can reduce current (Inrush) current, over voltage protection (OVP) and over current protection (OCP) can determine the system working in normal condition.

RT9285 using WDFN2x2-8L and TSOT-23-6 package, has now begun to provide samples.