In smart homes and other human-machine-interaction LED-driver applications, the performance demand for multi-channel RGB LED drivers is increasing to achieve great user experiences like blinking, breathing, and chasing LED-animation effects.
The LP50xx device is an 18- or 24-channel constant-current-sink LED driver. The LP50xx device improves the user experience in color mixing and brightness control, from both live effects and coding efforts. The optimized performance for RGB LEDs makes it a potential choice 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 brightness 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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