Click here to ask about the production status of specific part numbers. Evaluates: MAX25510, MAX25512 Evaluation Kit MAX25511, MAX25512 compatible software that provides a simple graphical General Description user interface (GUI) for exercising the features of the IC The MAX25512 evaluation kit (EV kit) demonstrates the (MAX25512 only). MAX25512 integrated 4-channel high-brightness LED 2 driver with I C interface for automotive displays, and its Note: The MAX25512 EV kit schematic and bill of materi- als (BOM) show only the MAX25512 (MAX25512ATG/V+) stand-alone mode counterparts, namely the MAX25510 and MAX25511. The EV kit operates from a DC supply as U2, but there are no other differences if the MAX25512 is replaced by the MAX25510 (MAX25510ATGA/V+) or voltage between 3V and 36V, and the switching frequency can be either set at 2.2MHz or at 400kHz. The EV kit MAX25511 (MAX25511ATGA/V+). can be configured to operate in stand-alone mode or in 2 Features I C mode. Spread-spectrum mode (SSM) is enabled by default for electromagnetic interference (EMI) improve- Demonstrates Robustness of the MAX25510, ment, but it can be disabled either by acting on a register MAX25511, and MAX25512 bit (MAX25512) or by properly choosing the resistor to be Wide 3V to 36V Input Operating Range (up to 40V connected to the SET pin (MAX25510 and MAX25511). Load Dump) The EV kit demonstrates phase-shifted pulse-width- Powers High-Brightness (HB) LEDs (up to Four modulation (PWM) dimming. Dimming can be performed Strings) for Medium-to-Large-Sized LCD Displays in either externally using a PWM signal applied to the DIM Automotive and Display Backlight Applications PCB pad or internally by programming the desired dim- 400kHz to 2.2MHz Resistor-Programmable Switching 2 ming frequency and individual duty cycle through I C Frequency with Spread-Spectrum Option (MAX25512 only). The hybrid dimming feature can be enabled through a register bit to reduce EMI (MAX25512 Phase-Shift Dimming Option only). The EV kit features a LED current foldback option Demonstrates Cycle-by-Cycle Current Limit and either as a function of the temperature, by means of a Thermal-Shutdown Features negative temperature coefficient (NTC) sensor (not pro- Demonstrates Wide Dimming Ratio 2 vided), or through analog dimming. I C-programmable Demonstrates Hybrid Dimming for Better EMI and (MAX25512) or resistor-programmable (MAX25510 and MAX25511) automatic fading functionality is also avail- Acoustic Performance and Higher Dimming Ratio able. Demonstrates Fade In/Out for Smooth Brightness Transition Finally, the EV kit demonstrates short-LED, open-LED, LED short to ground, boost output short to ground/under- Designed to Show Thermal Foldback Function voltage and overvoltage, and overtemperature-fault pro- 2 I C Programmability (MAX25512 only) tection. For operation at switching frequencies other than Dedicated GUI 2.2MHz or 400kHz, the external components should be chosen according to the calculations in the IC data sheet. Proven PCB and Thermal Design 2 The EV kit provides an I C interface that can operate in Fully Assembled and Tested conjunction with the MINIQUSB+ adapter board or a third- 2 Ordering Information appears at end of data sheet. party I C master. The EV kit also includes Windows- MAX25512 EV Kit Files FILE DESCRIPTION MAX25512GUISetupV01.exe Windows GUI Installer Windows is a registered trademark of Microsoft Corporation. 319-100757 Rev 1 6/21Evaluates: MAX25510, MAX25512 Evaluation Kit MAX25511, MAX25512 11) Verify that jumpers JMP3, JMP6, JMP7, and JMP9 Quick Start have shunts installed across pins 1-2 (bleed resistors Required Equipment connected, all current sinks enabled). MAX25512 EV kit 12) Connect the MINIQUSB+ interface boards P3 3V to 36V, 10A DC power supply header to the J24 header on the EV kit. Two digital voltmeters (DVMs) 13) Connect the positive terminal of the power supply to the IN PCB pad. Connect the negative terminal of Four series-connected HB LED strings (9 LEDs the power supply to a PGND PCB pad. each) rated to no less than 120mA 14) Connect a DVM across the OUT1 and GND PCB Current probe to measure the HB LED current pads. MINIQUSB+ interface board with USB cable 15) Connect the four LED strings from BOOST to the (MAX25512 only) OUT1, OUT2, OUT3, and OUT4 PCB pads. Windows-compatible PC with a spare USB port 16) Clip the current probe across the channel 1 HB (MAX25512 only) LED+ wire to measure the LED current. Procedure 17) Turn on the power supply and set it to 12V. The The EV kit is fully assembled and tested. To verify board green LED (DS1) should be on at this point. operation, follow these steps: 18) Launch the EV kit software application. Caution: Do not turn on the power supply until all 19) From the EV kit software toolbar, select Device connections are completed. 2 Scan for Address. The GUI scans the I C bus for 2 available slave addresses on the bus and selects the I C Mode (MAX25512) 2 first one (in this case, the MAX25512 I C address). 1) Visit www.maximintegrated.com to download the 2 Press OK once the MAX25512 I C address has latest version of the EV kit software, MAX25512GUI- been found. SetupV01.exe, from the products landing page. 20) 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 MAX25512GUISetupV01.exe program. The Figure 1. EV kit software application is then installed together 21) Check ENA to activate the driver in the 0x02 ISET with the required MINIQUSB+ drivers. register group box. 3) Verify that jumper J21 is closed (2.2MHz switching 22) Measure the voltage from each of the OUT PCB frequency selected). pads to PGND and verify the lowest voltage is 4) Verify that jumper J1 is closed (DS1 green LED approximately 0.7V. connected). 23) Measure the LED current using the current probe 5) Verify that jumpers J28 and J29 have shunts in- and verify all channels. stalled across pins 1-2 (SDA and SCL PCB pads 24) For more details on how to use the GUI and all the connected to SDA and SCL IC pins). features available, click on the GUI Help menu item. 6) Verify that jumpers J23 and J27 have shunts in- stalled across pins 1-2 and 2-3, respectively (5V Stand-Alone Mode (MAX25510 and MAX25511) external regulator enabled). 1) Verify that jumper J21 is closed (2.2MHz switching 7) Verify that jumpers J10 and J20 have shunts in- frequency selected). stalled across pins 1-2 (RSDT and TEMP IC pins 2) Verify that jumper J1 is closed (DS1 green LED both connected to V18). connected). 8) Verify that jumper J17 is closed (FAULT signaling 3) Verify that jumpers J28 and J19 have shunts in- through DS2 red LED enabled). stalled across pins 2-3 and 1-2, respectively (SET 9) Verify that a shunt is installed across pins 1-2 on IC pin connected to V18) and that jumper J29 has a jumper J2 (device enabled). shunt installed across pins 2-3 (ADIM PCB pad con- nected to ADIM IC pin). 10) Verify that a shunt is installed across pins 1-3 on jumper JMP1 (100mA current per channel selected). 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