L6460 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L6460' PDF : 139 Pages View PDF
L6460
Power bridges
the regulated current: the voltage provided at the IREF_FB pin will be compared to the
internal reference. L6460 has the possibility to choose between four voltage references
using the serial interface, writing the SelCurrRef[1:0] bits in the Aux3SwCfg1 register.
Regardless of the CurrRef voltage, if the IREF_FB pin remains below the chosen threshold,
the internal current limitation will work (typical Ilimit current 4A).
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.
In the Figure 22 is shown a typical Li-Ion battery charge profile.
Figure 22. Li-ion battery charge profile
Voltage or Current
Veochrg
Vchrg
Ichrg
Iprechrg
Ieochrg
Precharge
phase
Blue=Battery Voltage
FBRef depending
Red=Battery Current
CurrRef depending
Rapid charge
phase
Constant V. End Of Charge
phase
Time
The battery charge loop control can be used to implement a buck type switching regulator.
The regulated output voltage will be externally set by a resistor divider network connected to
VREF_FB pin, as already described and the current protection will be the one implemented
internally in the Bridge4 section.
Doc ID 17713 Rev 1
77/139
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