MAX17691AEVKIT# Analog Devices

Click here for production status of specific part numbers. Evaluates: MAX17691A in 5V MAX17691A Evaluation Kit Output-Voltage Application General Description Features The MAX17691A evaluation kit (EV kit) provides a proven 18V to 36V Input Range design to evaluate the performance of MAX17691A IC. Isolated Output: 5V/1.5A DC This fully assembled and tested circuit is implemented Compact Design with High Frequency (150kHz) using the MAX17691A, the No-Opto Flyback converter Switching with an integrated 76V nMOSFET, available in a 12-pin 87% Peak Efficiency TDFN package with an exposed pad. The IC data sheet provides a complete description of the part and should Resistor Programmable Input Enable/UVLO be read in conjunction with this EV kit data sheet prior to Protection operating the EV kit. Resistor Programmable Input Overvoltage Protection The MAX17691A EV kit output is configured for an iso - Internal Loop Compensation Reduces External lated +5V and provides up to 1.5A of output current over a Components 18V to 36V input range. The device switches at a 150kHz 5mS Internal Soft-Start Time switching frequency. The EV kit regulates the output voltage within 5% over the line, load, and temperature Temperature Compensated Output Voltage Over by sensing the output voltage on the primary side. The -40C to +125C Operating Temperature converter does not need an optocoupler for the isolated Provision to External Clock Synchronization and output voltage sensing. Frequency Dithering V Overdrive to Improve Efficiency CC Minimum Number of External Components CISPR22 (EN55022) Class B Compliant Ordering Information appears at end of data sheet. Proven PCB Layout Fully Assembled and Tested 319-100564 Rev 2 5/21MAX17691A Evaluation Kit Evaluates: MAX17691A in 5V Output-Voltage Application 3) Connect a DMM configured in voltmeter mode Quick Start across the VOUT PCB pad and the nearest GND0 Recommended Equipment PCB pad. MAX17691AEVKIT 4) Verify that shunt is installed across pins 1-2 on jump- er JU1 for proper operation. See Table 1 for details. One 18V to 36V DC, 1.5A power supply 5) Verify that shunts are not installed for pins 1-2 on 7.5W resistive load with 1.5A sink capacity jumpers JU2 and JU3. See Table 2 and Table 3 for Four digital multimeters (DMM) details. 6) Enable the power supply. Warning: 7) Verify that the output voltmeter displays 5V and if Do not turn on the power supply until all connections required, measure the output current using a DMM in are completed. ammeter mode. Do not touch any part of the circuit with bare hands 8) If required, vary the input voltage from 18V to 36V, or conductive materials when powered up. the load current from 3mA to 1.5A, and verify that Make sure all high-voltage capacitors are fully dis- output voltage is 5V. charged before handling. Allow 5 minutes after dis- Detailed Description connecting the input power source before touching The MAX17691A EV kit provides a proven design to circuit parts. evaluate the MAX17691A high-efficiency DC-DC flyback Equipment Setup and Procedure converter. The device use a novel sampling technique 1) Set the power supply to +24VDC. Disable the power to eliminate the optocoupler in sensing and regulating supply output. the isolated output voltage. The device integrates a 76V 2) Connect the positive terminal of the power supply to nMOSFET and reduces the external component count. the VIN PCB pad and the negative terminal to the The transformer design, as well as the selection of differ- nearest PGND PCB pad. Connect the positive termi- ent components, are detailed in the MAX17691A IC data nal of the electronic load to the VOUT PCB pad and sheet. All passive components selected for this EV kit are the negative terminal to the nearest GND0 PCB pad. available from multiple component vendors. Table 1. Converter SYNC Jumper (JU1) Settings SHUNT POSITION SYNC/DITHER PIN MAX17691A OPERATION 1-2* Connected to GND SYNC/DITHER function disabled Need to connect JU1 to external clock for external External clock synchronization or Not installed synchronization or implement dithering on SYNC/DITHER pin frequency dithering *Default position Table 2. Converter EN/UVLO Jumper (JU2) Settings SHUNT POSITION EN/UVLO PIN MAX17691A 1-2 Connected to VIN Converter is always enabled UVLO level is set by the resistor divider Not installed* Connected to the center node of resistor divider R2 and R3 between VIN and GND *Default position Table 3. Converter OVI Jumper (JU3) Settings SHUNT POSITION OVI PIN MAX17691A OPERATION 1-2 Connected to GND OVI function is disabled OVI level is set by the resistor divider Not installed* Connected to the center node of resistor divider R3 and R10 between VIN and GND *Default position Note: Refer to MAX17691A data sheet equations for calculating appropriate R2, R3, and R10 based on the preferred setting for JU2 and JU3. Maxim Integrated 2 www.maximintegrated.com