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MAX17703EVKITA Datasheet(PDF) 2 Page - Maxim Integrated Products |
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MAX17703EVKITA Datasheet(HTML) 2 Page - Maxim Integrated Products |
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2 / 15 page  Maxim Integrated │ 2 www.maximintegrated.com Evaluates: MAX17703 in 4.2V Li-Ion Battery Charger Application MAX17703EVKITA# Evaluation Kit Quick Start Recommended Equipment ● MAX17703EVKITA# ● 60V, 10A DC input-power supply (PS1) ● 4.2V, 45Ahr Li-ion battery with 15mΩ battery charging resistance (or) 25A DC power supply (PS2) and 12A DC electronic load (LOAD) ● Four digital voltmeters (DVM) Equipment Setup and Test Procedure The EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. Carefully make the con- nections to avoid the battery short circuit at the output. Do not operate the EV kit without battery or preloaded supply. The battery charger can be tested in two different ways, either with a battery or preloaded supply (power supply with electronic load). Testing with Battery: 1) Set the power supply at a voltage between 8.5V and 60V. Disable the power supply (PS1). 2) Make sure that the battery has an open circuit volt- age of 3.5V. 3) Connect PS1 and Li-ion battery to the EV kit as shown in Figure 1. 4) Verify that the shunts are installed across pins 1–2 on all jumpers: charger enable/disable jumper (J1), CC mode charging current jumper (J2), TEMP fea- ture jumper (J3), and safety timer jumper (J4). See Table 1, Table 2, Table 3, and Table 4 for details. 5) Connect the digital voltage meter (DVM1) between the ISMON PCB pad and the nearest SGND PCB pad for monitoring the charging current. Connect DVM2 between the VOUT PCB pad and the nearest PGND PCB pad for measuring the charging voltage. 6) Connect the DVM3 between the FLG1 PCB pad and the nearest SGND PCB pad for monitoring the charger status. 7) Connect the DVM4 between the FLG2 PCB pad and the nearest SGND PCB pad for monitoring the charger status. See Table 5 for details. 8) Turn on the DC power supply. 9) The charger starts in CC state and the safety timer starts counting. Verify that the DVM1 displays 1.5V, proportional to a 10A charging current (ICHGMAX). 10) In CC state, observe that DVM3 and DVM4 displays 0V and 5.1V, respectively. 11) When the charging voltage reaches above 4.1V, the charger enters CV state, and the charging current starts to fall from 10A. Verify that when DVM2 dis- plays above 4.1V, the voltage reading on DVM1 falls from 1.5V, proportional to the charging current. 12) When the charging current falls below 1A within the default safety timer timeout of 10.4 hours, the char- ger enters the topup-charge state from the CV state. Verify that DVM1 shows less than 0.15V, proportion- al to the charging current of less than 1A. 13) When the charger enters the topup-charge state, the safety timer counter is reset, and the taper timer counter starts. 14) If the charging current does not fall below 1A within the safety timer timeout of 10.4 hours, the charger enters a latched-fault state. In latched-fault state, DVM3 and DVM4 displays 5.1V and 0V, respectively. 15) In the topup-charge state, the charger continues to regulate the charging voltage. After 63 minutes, the taper timer counter elapses, charging is terminated, and the charger enters full-battery state. Verify that both DVM3 and DVM4 displays 0V. 16) After testing is completed, switch off the power sup- ply and remove the connections from the EV kit. 17) Carefully remove the battery connection from the EV kit. Figure 1. Battery Connection with EV Kit VOUT PGND MAX17703EVKITA# + - DCIN PGND DC POWER SUPPLY (PS1) + - LI-ION BATTERY |
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