SABRE-LL-I datasheet(70/141 Pages) STMICROELECTRONICS

70 / 141 page

Power bridges

SABRE-LL-I

70/141

Adjustable reference voltages values can be changed using a metal layer change in order to

adapt them to customer system.

Regardless of the CurrRef voltage, if the IREF_FB pin remains below the chosen threshold,

the internal current limitation will work (see DC motor paragraph, Bridge4 Ilimit).

Battery charge profile

The battery charge profile can be chosen by fixing the desired CurrRef and FBRef internal

reference voltages and by choosing the desired V=f(I) trans-characteristic of the external

differential amplifier.

The following is a typical Li-Ion battery charge profile:

Figure 20.

Li-ion battery charge profile

Table 48.

Battery charger control loop CurrRef specification

Aux3SwCfg1

Reference voltage (CurrRef)

Comments

SelCurrRef[1] SelCurrRef[0]

Min

Typ

Max

Unit

0.873

0.900

0.927

Default state

1.394

1.437

1.480

1.746

1.8

1.854

2.182

2.25

2.318

Rapid charge

phase

Time

Voltage or Current

Blue=Battery Voltage

Red=Battery Current

FBRef depending

CurrRef depending

End Of Charge

Precharge

phase

Ichrg

Iprechrg

Vchrg

Veochrg

Ieochrg

Constant V.

phase

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