LED Driver 17 Click Board™

Product Code: MIKROE-5565

How Does The LED Driver 17 Click Board™ Work? The LED Driver 17 Click Board™ is based on the LT3755, a highly efficient DC/DC controller from Analog Devices. This Click board™ is designed as a Buck mode LED driver with the ability to output 500mA, offering, in addition, PWM dimming functionality. The LTR3755, a highly efficient DC/DC controller, operates as a constant-current source, features onboard low-side external N-channel power MOSFETs, which are driven from an internal regulated supply, and it is capable of driving high-power 16V LEDs. Due to its high efficiency and reliable protection features, this board can be used in applications that require consistent and precise LED lighting control. It can also be used in applications that demand high power output, such as commercial and industrial lighting. In terms of connectivity, this solution is designed to be controlled via the PWM pin of the mikroBUS™ socket to provide LED dimming control with ratios of up to 3000:1. In addition, the LT3755 also has a frequency adjust pin that allows the user to program the switching frequency from 100kHz to 1MHz.

This feature is performed via an onboard R5 resistor, with the 800kHz set as the default value to optimize efficiency and performance. Besides the PWM pin, this Click board™ also features a fault pin labelled FLT, which is routed to the default interrupt INT position of the mikroBUS™ socket. This fault pin indicates any fault conditions to an external system, including overvoltage and overcurrent protection. Besides information via the mikroBUS™ socket, the fault signal is visually indicated via a red LED labelled LD2. This LED Driver 17 Click supports an external power supply for the driver, which can be connected to the input terminal labelled VIN and should be within the range of 22V to 36V. The LED Driver 17 Click Board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development. SPECIFICATIONS Type LED Drivers Applications It can be used for applications that demand high power output, such as commercial and industrial lighting On-board modules LTR3755 - DC/DC controller from Analog Devices Key Features Buck mode LED driver, 500mA, PWM dimming, wide input voltage supply, output voltage suitable for 16V high power LEDs, protection features, adjustable switching frequency, fault detection and indication, and more Interface PWM Compatibility mikroBUS Click board size L (57.15 x 25.4 mm) Input Voltage 3.3V or 5V PINOUT DIAGRAM This table shows how the LED Driver 17 Click Board™ pinout corresponds to the pinout on the mikroBUS™ socket (the latter is shown in the two middle columns). Notes Pin Pin Notes NC 1 AN PWM 16 PWM PWM Signal NC 2 RST INT 15 FLT Fault Signal NC 3 CS RX 14 NC NC 4 SCK TX 13 NC NC 5 MISO SCL 12 NC NC 6 MOSI SDA 11 NC Power Supply 3.3V 7 3.3V 5V 10 5V Power Supply Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS Label Name Default Description LD1 PWR - Power LED Indicator LD2 LD2 - Fault LED Indicator JP1 VCC SEL Left Logic Level Voltage Selection 3V3/5V: Left position 3V3, Right position 5V LED DRIVER 17 CLICK ELECTRICAL SPECIFICATIONS Description Min Typ