PRELIMINARY Click here for production status of specific part numbers. Evaluates: MAX25014 MAX25014 Evaluation Kit General Description Benefits and Features The MAX25014 evaluation kit (EV kit) demonstrates the Demonstrates Robustness of MAX25014 MAX25014, integrated 4-channel high-brightness LED Wide 2.5V to 36V Input Operating Range 2 driver with boost controller and I C interface for automo- (Up to 40V Load Dump) tive displays. Powers HB LEDs (Up to four strings) for Medium-to- The EV kit operates from a DC supply voltage between Large-Sized LCD Displays in Automotive and Display 2.5V and 36V and the switching frequency can be either Backlight Applications set at 2.2MHz or at 400kHz. The EV kit can only be 400kHz to 2.2MHz Resistor-Programmable Switching 2 configured to operate in I C mode. Spread-Spectrum Frequency with Spread-Spectrum option mode (SSM) is enabled by default for EMI improvement but it can be disabled by acting on a register bit. The EV Phase-Shift Dimming option kit demonstrates phase-shifted pulse-width modulation Demonstrates Cycle-by-cycle Current Limit and (PWM) dimming. Dimming can be performed either exter- Thermal-Shutdown Features nally using a PWM signal applied to the DIM PCB pad or Demonstrates Wide Dimming Ratio internally by programming the desired dimming frequency 2 Demonstrates Failsafe operation and individual duty cycle via I C. The hybrid dimming feature can also be enabled through a register bit to 2 I C Programmability reduce EMI. The EV kit also demonstrates short-LED, Dedicated GUI open-LED, Boost output Undervoltage and Overvoltage Proven PCB and Thermal Design and overtemperature-fault protection. LED current mea- surement, and boost output voltage measurement are Fully Assembled and Tested also demonstrated. For operation at switching frequencies other than 2.2MHz MAX25014 Ev Kit Files or 400kHz, the external components should be chosen according to the calculations in the MAX25014 IC data FILE DECRIPTION sheet. MAX25014GUISetupV01.exe Windows GUI Installer 2 The EV kit provides an I C interface that can operate in conjunction with the MINIQUSB+ adapter board 2 or a third-party I C master. The EV kit also includes Ordering Information appears at end of data sheet. Windows -compatible software that provides a simple graphical user interface (GUI) for exercising the features of the IC. 19-XXXX Rev 0 4/20PRELIMINARY Evaluates: MAX25014 MAX25014 Evaluation Kit 10) Connect the MINIQUSB+ interface boards P3 Quick Start header to the J24 header on the EV kit. Required Equipment 11) Connect the positive terminal of the power supply to MAX25014 EV kit the IN PCB pad. Connect the negative terminal of 2.5V to 36V, 16A DC power supply the power supply to a PGND PCB pad. Two digital voltmeters (DVMs) 12) Connect a DVM across the OUT1 and GND PCB pads. Four series-connected HB LED strings (9 LEDs each) rated to no less than 150mA 13) Connect the four LED strings from BOOST PCB pad to the OUT1, OUT2, OUT3 and OUT4 PCB pads. Current probe to measure the HB LED current 14) Clip the current probe across the channel 1 HB MINIQUSB+ interface board with USB cable LED+ wire to measure the LED current. Windows -compatible PC with a spare USB port 15) Turn on the power supply and set it to 12V. The Procedure green LED (DS1) should be on at this point. The EV kit is fully assembled and tested. Follow the steps 16) Launch the EV kit software application. below to verify board operation. 17) From the EV kit software toolbar, select Device Caution: Do not turn on the power supply until all 2 Scan for Address. The GUI scans the I C bus for connections are completed. available slave addresses on the bus and selects the 2 first one (in this case, the MAX25014 I C address). 1) Download the latest version of the EV kit software, 2 Press OK once the MAX25014 I C address has MAX25014GUISetupV01.exe, from the products been found. landing page at www.maximintegrated.com. 18) Verify that the status bar in the bottom-right corner 2) Install the EV kit software (GUI) on your PC by run- of the GUI displays EV Kit: Connected, as shown in ning the MAX25014GUISetupV01.exe program. The Figure 1. EV kit software application will be installed together with the required MINIQUSB+ drivers. 19) Uncheck the Max ISET box in the upper-left corner of the GUI window. 3) Verify that jumper J17 is closed and that jumper J22 is open (2.2MHz switching frequency selected). 20) In the 0x02 ISET register group box, select the desired OUT current value (45mA to 120mA in 5mA 4) Verify that jumper J1 is closed (DS1 green LED steps) by acting on the ISET slider bar, then click the connected). Refresh button. 5) Verify that jumper J23 is closed (FSEN function 21) In the 0x02 ISET register group box, check ENA to disabled). activate the driver. 6) Verify that jumper J11 is closed (FAULT signaling 22) Measure the voltage from each of the OUT PCB through DS2 red LED enabled). pads to PGND and verify the lowest voltage is ap- 7) Verify that jumper J9 is closed and that jumper J7 is proximately 1V. open (49.9k IREF resistor selected). 23) Measure the LED current using the current probe 8) Verify that a shunt is installed across pins 1-2 on and verify all channels. jumper J2 (device enabled). 24) For more details on how to use the GUI and all the 9) Verify that jumpers JMP3, JMP6-JMP7 and JMP9 features available, click on the GUI Help menu item. have shunts installed across pins 1-2 (bleed resistors connected, all current sinks enabled). Maxim Integrated 2 www.maximintegrated.com