MAX17823B datasheet(32/121 Pages) MAXIM

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MAX17823B

12-Channel High-Voltage Data Acquisition System

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Maxim Integrated | 32

Cell Balancing

Cell-Balancing Switches

Cell balancing may be performed using any of the twelve internal cell-balancing switches to discharge cells. The

cell-balancing current is limited by the external balancing resistors and the internal balancing switch resistance (RSW).

Enabling adjacent balancing switches simultaneously may increase the balancing current significantly so care must

be taken to not exceed the device’s maximum operating conditions. Fault detection is described in the Diagnostics

section.

Balancing

Switch (n)

To ALTMUX

SWn

SWn-1

AGND

Cn-1

BALSWEN

Rfilter

Rbalance

Cfilter

Cell n

Rfilter

Rbalance

Cfilter

Rbalfilter

To HVMUX

To Cell n-1

To Cell n+1

Sense Wire

Figure 15. Internal Cell-Balancing

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 conducting current at any one time.

The power dissipation must not exceed the absolute maximum rating of the package nor should the die temperature

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 and so the maximum balancing current is

lowered accordingly as shown in Table 11 for an assumed 10-year device lifetime.

Table 11. Maximum Allowed Balancing Current per Switch

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

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