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MAX17703EVKITA Datasheet(PDF) 3 Page - Maxim Integrated Products |
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MAX17703EVKITA Datasheet(HTML) 3 Page - Maxim Integrated Products |
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3 / 15 page  Maxim Integrated │ 3 www.maximintegrated.com Evaluates: MAX17703 in 4.2V Li-Ion Battery Charger Application MAX17703EVKITA# Evaluation Kit Testing with Preloaded Supply: 1) Set the first power supply (PS1) at a voltage be- tween 8.5V and 60V. Disable the power supply (PS1). 2) Set the second power supply (PS2) at a voltage of 3.5V and current limit of 13A. Disable the power sup- ply (PS2). 3) Set the electronic load (LOAD) at 12A in Constant Current (CC) mode and disable the load. 4) Connect PS1, PS2, and LOAD to the EV kit as shown in Figure 2. 5) Make sure that LOAD is connected across the PS2 terminals and the connection resistance from the EV kit to the preloaded supply is not greater than 50mΩ. 6) 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. 7) Connect the digital voltage meter (DVM1) between the ISMON PCB pad and the nearest SGND PCB pad for monitoring the charging current. 8) Connect DVM2 between the VOUT PCB pad and the nearest PGND PCB pad for measuring the charging voltage. 9) Connect DVM3 between FLG1 PCB pad and the nearest SGND PCB pad for monitoring the charger status. 10) Connect DVM4 between FLG2 PCB pad and the nearest SGND PCB pad for monitoring the charger status. See Table 5 for details. 11) Turn on LOAD and PS2. Verify that 12A load current is supplied by PS2 and adjust the PS2 voltage to maintain the EV kit terminal voltage at 3.5V. 12) Turn on the DC power supply (PS1). 13) The charger starts in CC state and the safety timer starts counting. Verify that the DVM1 displays 1.5V, proportional to the 10A charging current (ICHGMAX). 14) In CC state, observe that DVM3 and DVM4 displays 0V and 5.1V, respectively. 15) Increase the voltage on PS2 in steps of 10mV to maintain the DVM2 reading at 4.1V when the char- ger enters CV state, and the charging current starts to fall from 10A. Verify that when DVM2 displays above 4.1V, the voltage reading on DVM1 falls from 1.5V, proportional to charging current. 16) Increase the voltage on PS2 such that the charg- ing current falls below the taper current threshold, i.e.,1A. Verify that the DVM1 shows less than 0.15V, proportional to the charging current. The charger enters topup-charge state upon detecting the taper current threshold. 17) In topup-charge state, the charger resets the safety timer counter and starts the taper timer counter. 18) In the topup-charge state, the charger continues to regulate the charging voltage. After 63 minutes, the taper timer elapses, charging is terminated, and the charger enters the full-battery state. Observe that both DVM3 and DVM4 display 0V. 19) Reduce the PS2 voltage to less than the charger re- charge threshold of 4V and observe that the charger resumes charging automatically. Verify that DVM3 and DVM4 displays 0V and 5.1V, respectively. 20) After testing is completed, switch off PS1 and re- move the connection. 21) Switch off PS2 and LOAD. Carefully remove the preloaded supply connections from EV kit. Figure 2. Preloaded Supply Connection with EV Kit VOUT PGND + - DC ELECTRONIC LOAD + - MAX17703EVKITA# + - DCIN PGND DC POWER SUPPLY (PS1) DC POWER SUPPLY (PS2) PRELOADED SUPPLY |
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