MAX25202EVKIT# Analog Devices

Click here to ask about the production status of specific part numbers. Evaluates: MAX25202 MAX25202 Evaluation Kit General Description Quick Start The MAX25202 evaluation kit (EV kit) is a fully assembled Required Equipment and tested application circuit that simplifies the evalu - MAX25202 EV kit ation of the MAX25202 400kHz, 36V boost controller. 30V, 25A DC power supply (PS1) All 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 MAX25202 Procedure (24V, 400kHz) and can also be used to evaluate other The EV kit is fully assembled and tested. Follow the steps MAX25202 variants with minimal component changes below to verify board operation. shown in the MAX25202 EV Kit Bill of Materials. Caution: Do not turn on the power supply until all Benefits and Features connections are completed. 4.5V to 36V 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 Boost Output Voltages Adjustable between 4.5V and PS1 output. 60V via External Resistors 3) Turn off the EL1 and preset the load to 8A. Boost Fixed Output Voltage Available with Minor 4) Connect the positive terminal of EL1 to the OUT Component Changes screw terminal connect the negative terminal of EL1 2% Output Voltage Accuracy to GND2 screw terminal. Frequency-Synchronization Input 5) Connect the positive terminal of PS1 to the SUP screw terminal connect the negative terminal of PS1 Enable Input to GND1 screw terminal. Voltage-Monitoring PGOOD Output 6) Connect the positive terminal of VM1 to the OUT test Jumpers and Test Points on Key Nodes for Simplified point loop connect the negative terminal of VM1 to Evaluation the GND2 test point loop. Proven PCB Layout 7) Enable the power supply output. Fully Assembled and Tested 8) Enable the electronic load EL1. 9) Verify that the voltmeter on OUT measures approxi- Ordering Information appears at end of data sheet. mately 24V. 319-100592 Rev 0 9/20Evaluates: MAX25202 MAX25202 Evaluation Kit Table 1. Default Jumper Settings JUMPER SHUNT POSITION FUNCTION J1 1-2 Boost controller enabled J2 1-2 FSYNC is pulled to VBIAS enabling forced-pulse-width modulation (FPWM) mode J3 Installed PGOOD is pulled up to VBIAS when OUT is in regulation J4 1-2 OUT is shorted around the 20 resistor in the feedback network used for frequency analysis PGOOD pulls low when the output voltage drops below Detailed Description 92.5% (typ) of its nominal regulated voltage. The MAX25202 EV kit provides a fully developed and proven layout for evaluating all variants of the MAX25202 To obtain logic signals, pull up PGOOD to BIAS by install- ing the shunt on jumper J3. family of current-mode-controlled boost controller ICs. The controller accepts supply voltages as high as 36V The EV kit also provides an LED to monitor PGOOD visu- and supply transients up to 42V. ally. 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 VOUT1 conditions. R9 R10 1 VFB The FSYNC pin can be used to synchronize the switch- ing frequency of the IC to an external clock source by Evaluating Other Variants applying an external clock signal ranging from 220kHz to 2.2MHz. The device is forced to operate in PWM mode The MAX25202EVKIT comes installed with the synchro- when FSYNC is connected to a clock source. nous boost variant (MAX25202ATEA/VY+). Maxim Integrated offers additional variations of the Boost Output Monitoring (PGOOD) MAX25202 including spread-spectrum options. See the The EV kit provides an output test point (PGOOD) to MAX25202 IC datasheet for part variant details and con- monitor the status of the boost output voltage at OUT. tact the factory to request any additional variants. The PGOOD pin goes to a state of high impedance and pulls high through a pullup resistor when the boost output voltage rises above 94.5% (typ) of its regulation voltage. Ordering Information PART TYPE MAX25202EVKIT 24V/400kHz EV Kit Denotes RoHS compliant. Maxim Integrated 2 www.maximintegrated.com =