Click here to ask an associate for production status of specific part numbers. MAX25603 Evaluation Kit Evaluates: MAX25603 Quick Start General Description Required Equipment The MAX25603 evaluation kit (EV kit) provides a proven design to evaluate the MAX25603 automotive high- MAX25603 EV kit voltage, high-brightness LED buck-boost controller. The 12V, 5A DC power supply EV kit operates from a 5V to 60V DC supply voltage. The Signal generator EV kit is configured to deliver up to 1A to one or two strings Series-connected LED strings rated to at least 1.5A of 1 to 15 LEDs. The total voltage of each string can vary Oscilloscope with a current probe from 0V to 60V. The anode of the LED strings should go to Procedure LED1+ or LED2+ terminals and the cathodes to the GND The EV kit is fully assembled and tested. Use the following terminal. Shunting FETs are provided to emulate a combination headlamp in which a single LED string can steps below to verify board operation: contain the clearance lamp (CLL), low beam (LB), and high Caution: Do not turn on power supply until all beam (HB) all in one. Each can be independently turned connections are made. Be sure not to violate power on or off by shorting across the appropriate segments of ratings if modifying component values. the LED string. 1. Verify that all jumpers are in their default positions, as shown in Table 1. 2. Connect the positive terminal of the 12V supply to Features VINP1 and the negative terminal to the PGND. 5V to 60V Input Voltage Range 3. Connect the anode a LED string to LED1+ and the Demonstrates Use in Combination Headlamps and cathode to GND on the EV kit. Multistring, Time-Sharing Applications 4. Clip the current probe on the wire connected to the LED Analog and Digital Dimming Control string. Input Current Limit 5. Turn on the DC power supply. LED Current Clamp Function 6. Apply 5V to EN1. Output Discharge for Faster Transient Time 7. Verify that the LEDs turn on. LED Short and Open Protection 8. Adjust potentiometer R3 until the LED current is Proven PCB Layout approximately 1A. Fully Assembled and Tested Ordering Information appears at end of data sheet. EV Kit Photo 319-100847 Rev 0 12/21MAX25603 Evaluation Kit Evaluates: MAX25603 Table 1. Jumper Connection Guide JUMPER SHUNT POSITION FEATURE Apply an external DC voltage between 0.2V to 1.2V for setting the LED current. Open J1 Uses the resistive divider from VCC and the potentiometer R3 to set the LED current. Closed Uses the resistive divider from VCC and the potentiometer R3 to set the LED current. Open J2 1-2 R4 is placed in series with R3 to lower the LED current when EN2 is high. 2-3 R4 is placed in series with R3 to lower the LED current when EN1 is high. Open Apply an external 0 to 5V signal on the SHUNT pin. J3 1-2 SHUNT pin is tied to VCC. The error amplifier will always be connected to COMP2. SHUNT pin is tied to GND. The error amplifier will always be connected to COMP1. 2-3 Apply an external 0 to 5V PWM clock source for PWM dimming on Q6. Open EN2 pin pulled to VCC for 100% duty on Q6. J4 1-2 EN2 pin pulled to GND to turn off Q6. 2-3 Apply an external 0 to 5V PWM clock source for PWM dimming on Q5. Open EN1 pin pulled to VCC for 100% duty on Q5. J5 1-2 EN1 pin pulled to GND to turn off Q5. 2-3 Disconnects the source of shunting FET Q7 from LED2+. Open J6 Closed Connects the source of shunting FET Q7 to LED2+. Disconnects the drain of shunting FET Q7 from LB+. Open J7 Connects the drain of shunting FET Q7 to LB+. Closed Open Overvoltage protection threshold is set by the resistive divider from VOUTCAP. R49 is placed in parallel with R46 and lowered the overvoltage protection threshold when 1-2 EN2 is high. J8 R49 is placed in parallel with R46 and lowered the overvoltage protection threshold when 2-3 EN1 is high. Open LED2+ LEDs are driven through the Q6. J10 Closed Bypasses Q6. Use to compare performance without the LED current clamp. Open LED1+ LEDs are driven through Q5. J11 Closed Bypasses Q5. Use to compare performance without the LED current clamp. Default options appear in bold. Setup and Operation 1. Verify that all jumpers are in their default positions, as shown in Table 1. 2. Connect the positive terminal of the 12V supply to VINP1 and the negative terminal to the PGND. 3. Connect the anode a LED string to LED1+ and the cathode to GND on the EV Kit. 4. Clip the current probe on the wire connected to the LED string. 5. Turn on the DC power supply. 6. Apply 5V to EN1. 7. Verify that the LEDs turn on. 8. Adjust potentiometer R3 until the LED current is approximately 1A. Clearance Lamp (CCL), Low Beam (LB), High Beam (HB) Shunting FETs Q7, Q9, Q10, and Q11 are provided to emulate an application in which a single MAX25603 device can drive the clearance lamp, daytime running lamps, low beam, and high beam functions all from a single LED string. The following procedure describes how to configure this EV kit to drive the LED configuration shown in Typical Application Circuit. 19-XXXXXX Rev 0 MM/YY