MAX17843 datasheet(42/131 Pages) MAXIM

42 / 131 page

Maximum Cell-Balancing Current

The maximum balancing current is limited by package

power dissipation, average die temperature, average duty

cycle of the switch, and the number of switches conduct-

ing current at any one time.

The power dissipation must not exceed the absolute

maximum rating of the package, nor should the die tem-

perature go outside the range specified for the desired

level of measurement accuracy. Higher die temperatures

and higher average duty cycles increase the probability

of internal electromigration, so the maximum balancing

current is lowered accordingly, as shown in Table 13 for

an assumed 10-year device lifetime.

Cell-Balancing Watchdog

Even if the host fails to disable the cell-balancing mode, the

cell-balancing watchdog can automatically disable the cell-

balancing switches regardless of the BALSWEN configu-

ration. The cell-balancing watchdog does not modify the

contents of the BALSWEN register. Use the WATCHDOG

(64min), as shown in Table 14. The pre-divider configu-

ration CBPDIV[2:0] effectively sets the rate at which the

CBTIMER[3:0] counts down (see Figure 20).

Figure 20. Cell-Balancing Watchdog

Table 13. Maximum Allowed Balancing Current per Switch

Table 14. Cell-Balancing Watchdog Configuration

AVERAGE LIFETIME DUTY CYCLE

(10 YEARS)

TDIE = 85°C

TDIE = 105°C

TDIE = 125°C

15%

> 320mA

215mA

20%

> 320mA

320mA

161mA

25%

> 320mA

256mA

129mA

CBPDIV[2:0]

TIMER LSb PERIOD

RANGE OF CBTIMER[3:0]

MINIMUM

MAXIMUM

000b

Timer Disabled

001b

15s

010b

60s

011b

16s

240s

100b

64s

960s

101b

128s

1920s

110b

256s

3840s

32.768KHz

CBPDIV

CBTIMER

TIMER ZERO

FLAG

BIT 0

BIT 1

BIT 2

BIT 3

BALSWEN

CELL BALANCING

SWITCH ENABLE

CBTIMER ENABLE

CBPDIV1

CBPDIV0

CBPDIV2

MAX17843

12-Channel, High-Voltage Smart Sensor

Data-Acquisition Interface

www.maximintegrated.com

Maxim Integrated │ 42

MAX17843 датащи(PDF) 42 Page - Maxim Integrated Products

MAX17843 датащи(HTML) 42 Page - Maxim Integrated Products

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL