MAX25201EVKIT# Analog Devices

Click here for production status of specific part numbers. Evaluates: MAX25200, MAX25201 MAX25201 Evaluation Kit General Description Quick Start The MAX25201 evaluation kit (EV kit) is a fully assembled Required Equipment and tested application circuit that simplifies the evaluation MAX25201 EV kit of the MAX25201 400kHz, 36V boost controller. All 30V, 25A DC power supply (PS1) installed components are rated for the automotive temperature range. Various test points and jumpers are One voltmeter (VM1) included for evaluation. One electronic load, 200W capable (EL1) The standard EV kit comes with the installed MAX25201 Procedure (24V, 400kHz) and can also be used to evaluate other The EV kit is fully assembled and tested. Follow the steps MAX25201 variants with minimal component changes below to verify board operation. shown in the MAX25201 EV Kit Bill of Materials. Caution: Do not turn on the power supply until all Benefits and Features connections are completed. 4.5V to 42V Input Supply Range 1) Verify that all jumpers are in their default positions as Input Voltage Range Extended down to 2V after shown in Table 1. Initial Startup 2) Preset the output voltage of PS1 to 14V. Disable PS1 output. Boost Output Voltages Adjustable Between 4.5V and 3) Turn off the EL1 and preset the load to 4A. 60V via External Resistors 4) Connect the positive terminal of EL1 to OUT connect Boost Fixed Output Voltage Available with Minor the negative terminal of EL1 to GND2. Component Changes 5) Connect the positive terminal of PS1 to the SUP 2% Output Voltage Accuracy connect the negative terminal of PS1 to GND1. 6) Connect the positive terminal of VM1 to OUT Frequency-Synchronization Input connect the negative terminal of VM1 to GND6. Enable Input 7) Enable the power supply output. Voltage-Monitoring PGOOD Output 8) Enable the electronic load EL1. 9) Verify that the voltmeter on OUT measures Jumpers and Test Points on Key Nodes for Simplified approximately 24V. Evaluation Proven PCB Layout Fully Assembled and Tested Ordering Information appears at end of data sheet. 319-100422 Rev 0 8/19Evaluates: MAX25200, MAX25201 MAX25201 Evaluation Kit Table 1. Default Jumper Settings JUMPER SHUNT POSITION FUNCTION J1 1-2 Boost controller enabled J2 1-2 FSYNC is pulled to V enabling FPWM mode BIAS J3 Installed PGOOD is pulled up to V when OUT is in regulation BIAS J4 1-2 OUT is shorted around the 20 resistor in the feedback network used for frequency analysis voltage drops below 92.5% (typ) of its nominal regulated Detailed Description voltage. The MAX25201 EV kit provides a fully developed and To obtain logic signals, pull up PGOOD to BIAS by proven layout for evaluating all variants of the MAX2501 family of current-mode-controlled boost controller ICs. installing the shunt on jumper J3. The controller accepts supply voltages as high as 36V The EV kit also provides an LED to monitor PGOOD and supply transients up to 40V. visually. The LED illuminates when PGOOD is low, implying the converter has fallen out of regulation. Switching Frequency and External Synchronization Setting the Output Voltage in the The IC can operate in two modes: forced-PWM or skip Boost Converter mode. Skip mode offers improved efficiency over PWM The EV kit comes assembled to provide 24V regulation during light-load conditions. When FSYNC is pulled low, on OUT. To adjust the output voltage, remove and replace the device operates in skip mode for light loads, and in appropriate resistors in positions R9 and R10 according PWM mode for larger loads. When FSYNC is pulled high, to the following equation: the device is forced to operate in PWM across all load V conditions. OUT1 R9 =R10 1 V The FSYNC pin can be used to synchronize the switching FB frequency of the IC to an external clock source by where V = 1V (typ) and R10 = 5k. FB applying an external clock signal ranging from 220kHz to 2.2MHz. The device is forced to operate in PWM mode Evaluating Other Variants when FSYNC is connected to a clock source. The MAX25201EVKIT comes installed with the synchronous boost variant (MAX25201ATEA/VY+). Boost Output Monitoring (PGOOD) Maxim Integrated offers additional variations of the The EV kit provides an output test point (PGOOD) to MAX25201 that include spread-spectrum options. See monitor the status of the boost output voltage at OUT. The the MAX25201 IC Datasheet for part variant details and PGOOD pin goes to a state of high impedance and pulls contact the factory to request any additional variants. high through a pullup resistor when the respective boost output voltage rises above 94.5% (typ) of its regulation See the MAX25201 EV Kit Bill of Materials to select voltage. PGOOD pulls low when the respective output components for evaluating higher frequency configurations. Ordering Information PART TYPE MAX25201EVKIT 24V/400kHz EV Kit Denotes RoHS compliant. Maxim Integrated 2 www.maximintegrated.com