AIC1802BCS datasheet(8/10 Pages) AIC

8 / 10 page

AIC1802

time TOI is tabulated as below.

VCS (V)

TOI (S)

150m

9.0m

200m

5.6m

300m

2.8m

360m

2.0m

540

290

270

Unbalanced Discharge after Overcharge

When either of the battery cells is overcharged,

the AIC1802 will automatically discharge the

overcharged cell at about 7.7mA until the voltage

of the overcharged cell is equal to the voltage of

the other cell. If the voltage of the other cell is

below VOCR, the internal cell-balance “bleeding”

will proceed until the voltage of the overcharged

cell decreases to VOCR.

DESIGN GUIDE

Adjustment

Overcharge

and

Overdischarge Delay Time

Both the overcharge and overdischarge delay

times default to 25mS and can be extended by

adding the external capacitors CTC and CTD,

respectively. Increasing the capacitance value will

increase the delay time. The relationship between

capacitance of the external capacitors and delay

time is tabulated as below:

CTC (F)

TOC (S)

25m

0.1

320m

0.3

890m

0.47

1.12

0.57

1.43

CTD (F)

TOD (S)

25m

0.1

320m

0.3

820m

0.47

1.08

0.57

1.39

Selection of External Control MOSFETs

Because the overcurrent protection voltage is

preset, the threshold current for

overcurrent

detection is determined by the turn-on resistance

of the discharge control MOSFET M1. The turn-

on resistance of the external control MOSFETs

can be determined by the equation: RON=VOIP/IT

(IT is the overcurrent threshold current). For

example, if the overcurrent threshold current IT is

designed to be 5A, the turn-on resistance of the

external control MOSFETs must be 30m

Ω. Users

should be aware that turn-on resistance of the

MOSFET changes with temperature variation due

to heat dissipation. It changes with the voltage

between gate and source as well. (Turn-on

resistance of a MOSFET increases as the voltage

between gate and source decreases). Once the

turn-on resistance of

the

external

MOSFET

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