Analog Devices DC2374B Demo Manual page 5

24V SUPPLY QUICK START PROCEDURE
6. Set PS1 to 17V and then turn on.
7. Slowly increase PS1 until the STAT0 LED illuminates.
DCIN is now above the UVLO rising threshold.
NOTE: PS1 can be increased from this voltage up to 35V.
Make sure that the input voltage does not exceed 40V.
8. Observe that the battery charger current is only about
1A, 20%, and the voltage on the ISMON terminal
measures about 0.2VDC. This is because the battery
voltage is below the LB threshold. If the battery voltage
remains below low bat for 25 minutes then the charge
cycle is terminated.
9. Slowly increase PS2 until the battery current jumps up
to about 5A, full load. ISMON reads close to 1V. The
battery voltage is now above the low battery threshold.
10. Slowly increase PS2 until the battery current decreases
to 4.5A. If the STAT0 LED is on and the STAT1 LED is
off then the battery voltage is now approaching the
absorption voltage and the charge timer has started.
The battery will charge for about 3.3hrs before switch-
ing to float mode.
11. When the LTC4013 switches to float mode, the charge
current will drop to 0A until the battery voltage is
decreased below 13.6V.
To observe equalization mode, follow steps 12 thru 18.
Otherwise skip to step 19.
NOTE: Equalization mode will not enable more than one
time during a power on event. If an equalization cycle has
already completed, power will need to be cycled in order
to run a second equalization cycle.
DEMO MANUAL DC2374B
12. Make sure PS1 is set above UVLO rising threshold and
set PS2 to about 12V.
13. Make sure JP6, the TIMER jumper, is still in the CAP
position. Set JP3, the MODE2 jumper, to the HI posi-
tion. The STAT0 LED should be on and the STAT1 LED
should be off. If not, power PS1 down, set JP3 to LO,
turn PS1 back on, then set JP3 back to HI.
14. Increase PS2 until the battery voltage approaches the
absorption voltage as done in step 10.
15. Continue increasing PS2 until the battery current drops
below 500mA.
16. In about 3.33 hours the charge current will increase
to about 1A. This is equalization mode.
17. Increase PS2 until the battery current starts to decrease.
The battery voltage is approaching the equalization
voltage.
18. After about 25 minutes in equalization mode the charge
current will return to about 0A until the battery voltage
is reduced below the float voltage of about 13.6V.
19. When done, turn off and disconnect all loads and
power supplies.
NOTE: To evaluate the MPPT function, see the MPPT Quick
Start Procedure section.
Rev. 0
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