Lumissil Launches 48-Channel LED Driver IC with 16-bit PWM and Programmable Current Adjustments

Lumissil Launches 48-Channel LED Driver IC with 16-bit PWM and Programmable Current Adjustments

Lumissil Microsystems, a division of Integrated Silicon Solution has announced the release of its latest 48-channel LED driver with a high-speed serial bus for RGB color tunning or single color brightness and contrast control. The IS31FL3248 can be used in LED displays to control individual pixels, allowing the creation of dynamic, high-resolution images. It enables displays to realize accurate local dimming and provides bright colors and ultra-high contrast that enhances the visual experience. It integrates EMI suppression circuitry and readback of LED diagnostics in case of fault conditions for robust designs. This device simplifies the design of message boards, LED status indicators, mini-LED backlights, and animation lighting.

“The demand for constant-current LED drivers that support an ever greater number of LEDs with consistent LED brightness and color accuracy continues to grow,” said Ven Shan, VP of Lumissil Marketing. “The IS31FL3248, with its high-speed serial bus and highly accurate LED current sinks, enables high brightness and contrast for the emerging mini-LED backlight displays providing a highly vivid and immersive experience.”

The IS31FL3248 is an ideal LED driver for applications with many LEDs to be controlled by a simple four-wire serial bus running at 33MHz. The SDI and SDO pins allow more than one device to be connected in a daisy chain for LED control using one serial interface. An external resistor sets the current for all 48 channels up to 33mA; software registers further adjust the three-channel grouping current and/or the individual channel current. An 8-bit register sets the brightness level for each grouping and a 6-bit register adjusts the brightness deviation between channels.

The IS31FL3248 uses proprietary programmable algorithms to minimize system noise generation and improve the overall EMI system performance. Applying PWM switching to the LED outputs can be particularly troublesome with regard to EMI. To optimize EMI performance, the IS31FL3248 includes a programmable spread spectrum function to lower the PWM clock’s peak electromagnetic energy by spreading it over a wide frequency range. In addition, a selectable 180-degree phase delay of the output channels reduces power supply inrush current which further helps reduce EMI.

The IS31FL3248 also has real-time LED open (LOD) and short (LSD) diagnostic capabilities. When enabled, the LED open or short condition can be detected in real-time with the status information stored in a system-readable register.

Typical applications for the IS31FL3248 include banks of 7-segment displays, single LED indicators as well as arrays of LEDs that form grids or panels for message boards or mini-LED backlighting. These usage examples are typically found on control panels for appliances or industrial applications. Simple signage displays composed of large LED dot arrays are also perfect applications for the IS31FL3248.

A soon-to-be-released automotive variant, the IS32FL3248 is designed to meet the strict AEC-Q100 qualification standards. The automotive grade IS32FL3248 allows cars to display rich animation information in the cabin as well as on the head and taillights. Automotive applications include animated taillights, welcome lighting, messaging displays, charge status indicator, and interior cabin ambient color lighting.

Click here to learn more about the IS32FL3248 LED driver IC.