DEMO MANUAL DC1621A LTM8062: 32V, 2A Module Power Tracking Battery Charger DESCRIPTION Demonstration circuit 1621A features the LTM 8062, a easy selection of C/10 or timer charge termination. The 32V, 2A Module power tracking battery charger. The LTM8062 data sheet must be read in conjunction with this demonstration circuit is designed to operate from a 9.75V quick start guide for working on or modifying the demo to 32V input source, and to charge a 2-cell battery pack circuit 1621A. to a oat voltage of 7.2V. The oat voltage can easily be Design les for this circuit board are available at changed to a higher or lower voltage by adjusting the DEMO MANUAL DC1621A QUICK START PROCEDURE Demonstration circuit 1621A is easy to set up to evaluate 5. Increase PS2 until V is 7.4V. Verify the battery BAT the performance of the LTM8062. charging current, I , is less than 5mA and that the BAT CHRG LED is off. Using short twisted pairs of leads for any power connection, with all loads and power supplies off, refer to Figure 1 for 6. Decrease PS2 until V is 6.8V. Verify the battery BAT the proper measurement and equipment setup. current, I , is between 1.775A and 2.225A and that BAT the CHRG LED is on. Follow the procedure below: 7. Set JP1 to off. Verify the charging current, I , is less BAT 1. Jumper and Power Supply Setting: than 5mA and that the FAULT LED and the CHRG LED JP1 = ON PS1 = OFF are off. JP2 = C/10 PS2 = OFF 8. Set JP1 to on. Connect a jumper from the NTC pin to ground. Verify the charging current, I , is less than 2. Turn on PS2 and slowly increase the voltage to 4.5V BAT 5mA and that the FAULT LED and the CHRG LED are while monitoring the current into the BAT pin. If the on. current is less than 5mA, turn on PS1. Increase the voltage on PS1 to 8V while monitoring the input cur- 9. Remove the jumper from NTC to ground. Verify the rent. If the current is less than 5mA, increase PS1 to charging current, I , is between 1.775A and 2.225A BAT 12V. and that the FAULT LED is off and the CHRG LED is on. 3. Verify that the battery charging current, I , is between BAT 250mA and 350mA. The CHRG LED should be on and 10. At this point, vary PS1 between the 9.75V to 32V range the FAULT LED should be off. if desired, and verify the charging current is between 1.775A and 2.225A and that the CHRG LED is on. 4. Increase PS2 until V is 6.3V. Verify the input current, BAT I , is between 1A and 1.5A, the battery current, I , IN BAT 11. This concludes the test. Turn off PS1 and PS2. is between 1.775A and 2.225A and that the CHRG LED is on. dc1621af 2