1

dc2374afa

DEMO MANUAL DC2374A

DESCRIPTION

LTC4013EUFD

60V Synchronous Buck

Multi-Chemistry Battery Charger

Demonstration circuit 2374A is a multi-chemistry battery

charger with maximum power point tracking (MPPT)

featuring the LTC®4013. The LTC4013 has 2 stage CC/CV

charge cycles, 3 stage and 4 stage lead acid and Li-Ion

battery algorithms.

The DC2374A is set up to operate from a 21.5V to 35V

supply or from a solar panel and charges a six cell lead

acid battery at 5A. There are optional input and output

capacitors plus large inductor pads and parallel top and

bottom FET pads to allow high power charging.

The LTC4013 is a 60V controller which makes it suitable

for large battery stacks with up to a 60V supply or solar

panelinput.AnMPPTburstmodefeatureallowsthedevice

to efficiently charge in low light levels. Since the LTC4013

is a controller, the power train can be sized from 1A to

L

, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

over 10A of charge current. The LTC4013 also has an NTC

temperature compensated float voltage to help increase

the battery life.

The operating frequency, charge voltage, low battery (LB)

voltage setting and timing are configurable with external

resistorsandacapacitor.Thedifferentchargingalgorithms

are set by two tri-state mode pins and the TIMER pin as

shown in Table 1.

Refer to the LTC4013 data sheet for more details on the

electrical and timing specifications.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2374A

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Input Supply Range

ENABLE (JP1) = UVLO

ENABLE (JP1) = ON, MPPT (JP2) = ON

21.5

5

24

35

35

V

V

MODE1 (JP4) = HI, MODE2 (JP3) = LO

MODE1 (JP4) = MID, MODE2 (JP3) = LO

MODE1 (JP4) = HI, MODE2 (JP3) = MID

MODE1 (JP4) = MID, MODE2 (JP3) = MID

13.6

13.2

14.2

14.4

V

V

V

V

MODE1 (JP4) = HI, MODE2 (JP3) = LO

MODE1 (JP4) = MID, MODE2 (JP3) = LO

14.2

14.4

V

V

MODE1 (JP4) = HI, MODE2 (JP3) = HI, TIMER (JP6) = CAP

MODE1 (JP4) = MID, MODE2 (JP3) = HI, TIMER (JP6) = CAP

16

15.6

V

V

MODE1 (JP4) = HI, MODE2 (JP3) = MID

MODE1 (JP4) = MID, MODE2 (JP3) = MID

13.77

13.77

V

V

10.4

V

MPPT (JP2) = ON

83.3

%

FBOC to DCIN Attenuation Ratio

MPPT (JP2) = ON

6.9

%