In smart homes and other human-machine-interaction applications for LED drivers, users want more performance for multi-channel RGB LED drivers. The goal is to get good user experiences with LED-animation effects such as flashing, breathing, and chasing.
The LP50xx device is an 18- or 24-channel constant-current-sink LED driver. The LP50xx device makes the user experience better in color mixing and intensity control. Persons at one time knew intensity control as brightness control. The user experience is better for live effects and for the work to write code. The optimization of performance for RGB LEDs makes it a possible alternative for human-machine-interaction applications.
The LP50xx device controls each LED output with a 12-bit PWM resolution at 29-kHz switching frequency, which helps achieve a smooth dimming effect and eliminates audible noise. The independent color mixing and intensity control registers make the software coding straightforward. When targeting a fade-in, fade-out type breathing effect, the global R, G, B bank control reduces the microcontroller loading significantly. The LP50xx device also implements a PWM phase-shifting function to help reduce the input power budget when LEDs turn on simultaneously.
The LP50xx device implements an automatic power-saving mode to achieve ultralow quiescent current. When channels are all off for 30 ms, the device total power consumption is down to 10 µA, which makes the LP50xx device a potential choice for battery-powered end-equipments.
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|LED Current Per Channel (mA)|
|Vin (Min) (V)|
|Vin (Max) (V)|
|Vout (Min) (V)|
|Vout (Max) (V)|
|Iout (Max) (A)|
|Iq (Typ) (mA)|
|Shutdown Current (Typ) (uA)|
|Operating Temperature Range (C)|
Power Save Mode
Power Save Mode
Analog/PWM Mixed Dimming
|-40 to 125||-40 to 85||-40 to 85|
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