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L6924U bảng dữ liệu(PDF) 20 Page - STMicroelectronics

tên linh kiện L6924U
Giải thích chi tiết về linh kiện  USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer
PDF  38 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L6924U bảng dữ liệu(HTML) 20 Page - STMicroelectronics

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Applications information: charging process
L6924U
20/38
Figure 12.
IUSB pin connection
Regardless of the operation mode (AC adapter or USB), during the fast-charge phase the
battery voltage increases until it reaches the programmed output voltage (4.2 V). A safety
timer is also present. If the Fast-charge phase does not finish within the programmed time
(see Chapter 7.8: Maximum charging time on page 22), a fault is given.
7.5
End-of-charge current
When the charge voltage approaches the battery regulated voltage (internally set to 4.2 V),
the voltage regulation phase takes place. The charge current starts to decrease until it goes
below a programmable termination current, IENDTH. This current can be selected by an
external resistor connected between the IEND pin and GND Figure 13, whose value can be
calculated as:
Equation 8
Figure 13.
IEND pin connection
Where KEND is 1050; and VMIN is 50 mV.
When the charge current goes below IENDTH, after a deglitch time, the status pins notify the
end of charge and the charge process ends.
This de-glitch time is expressed as:
Equation 9
where TMAXCH is the maximum charging time. (Chapter 7.8 on page 22)
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
×
=
ENDTH
END
MIN
END
I
K
V
R
E
220
MAXCH
DEGLITCH
T
T
=



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