MAX17690EVKITB# Analog Devices

Evaluates: MAX17690 MAX17690B No-Opto Flyback Evaluation Kit General Description Quick Start The MAX17690B evaluation kit (EV kit) is a fully assembled Recommended Equipment and tested circuit board that demonstrates the operation One 18V36V DC, 1A power supply of an isolated 5W no-opto flyback DC-DC converter. This 5W resistive load with 1A sink capacity circuit uses a MAX17690 in a 16-pin TQFN package with an exposed pad. The data sheet must be read in conjunction Four digital multimeters (DMM) with this quick start guide for demo circuit. MAX17690EVKITB The EV kit output is configured for an isolated +5V and provides Warning: up to 1A of output current. The device switches at a 180kHz Do not turn on the power supply until all connections switching frequency. The transformer provides the galvanic are completed. isolation between input and output, up to 1875VAC. Wear protective eye gear at all times. Features Do not touch any part of the circuit with bare hands 18V to 36V Input Range or conductive materials when powered up. Isolated Output: 5V/1A DC Make sure all high-voltage capacitors are fully Compact Design with High-Frequency (180kHz) Switching discharged before handling. Allow 5 minutes after Minimum Number of External Components disconnecting the input power source before touching circuit parts. 85.8% Peak Efficiency Low-Cost Flyback Design Equipment Setup and Test Procedure Galvanic Isolation up to 1875VAC 1) Set the power supply to +24VDC. Disable the power Proven PCB Layout supply output. 2) Connect the positive terminal of the power supply to the Fully Assembled and Tested V PCB pad and the negative terminal to the nearest IN PGND PCB pad. Connect the positive terminal of the electronic load to the V PCB pad and the negative OUT terminal to the nearest GND0 PCB pad. Ordering Information appears at end of data sheet. 3) Connect the resistive load across the output terminals. 4) Connect a DMM configured in voltmeter mode across the V PCB pad and the nearest GND0 OUT PCB pad. 5) Enable the power supply. 6) Verify that the output voltmeter displays 5V and, if required, measure the output current using a DMM in Ammeter mode. 7) If required, vary the input voltage from 18V to 36V, the load current from 0mA to 1A, and verify that output voltage is 5V. 19-8451 Rev 2 1/17toc02 toc01 Evaluates: MAX17690 MAX17690B No-Opto Flyback Evaluation Kit well as the selection of different components, are detailed Detailed Description in the MAX17690 IC data sheet. The MAX17690B EV kit provides a proven design to This EV kit provides the programmable soft-start time evaluate the MAX17690 high-efficiency DC-DC flyback converter. The device uses a novel sampling technique to limit the inrush current. The IC has overcurrent and thermal protection. to eliminate the optocoupler in the output voltage sensing across the isolation boundary. The transformer design, as EV Kit Performance Report EFFICIENCY vs. LOAD CURRENT OUTPUT VOLTAGE vs. LOAD CURRENT 90 5.200 80 5.180 70 V = 18V IN V = 18V V = 24V IN IN 60 5.160 V = 24V IN 50 5.140 40 V = 36V IN 30 5.120 V = 36V IN 20 5.100 10 0 5.080 0 100 200 300 400 500 600 700 800 900 1000 0 100 200 300 400 500 600 700 800 900 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD TRANSIENT RESPONSE, (LOAD CURRENT STEPPED SOFT-START, FULL LOAD toc04 FROM 500mA to 1A) toc03 5V/div V EN/UVLO V OUT 100mV/div 2V/div (AC) FIGURE6 APPLICATION CIRCUIT V =5V OUT V OUT 500mA/div I OUT 500mA/div 1.0ms/div 2ms/div Component Suppliers SUPPLIER WEBSITE Wurth Electronik www.we-online.com Murata Americas www.murata.com Panasonic Corp. www.panasonic.com Note: Indicate that you are using the MAX17690B when contacting these component suppliers. Maxim Integrated 2 www.maximintegrated.com EFFICIENCY (%) OUTPUT VOLTAGE (V)