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L6924D 数据表(PDF) 18 Page - STMicroelectronics

部件名 L6924D
功能描述  Battery charger system with integrated power switch for Li-ION/Li-POLYMER
PDF  38 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L6924D 数据表(HTML) 18 Page - STMicroelectronics

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Applications information: charging process
L6924D
18/38
7.2
Pre-charge current
The L6924D allows pre-charging the battery with a low current when the battery voltage is
lower than a specified threshold (VPRETH). The Pre-charge current has a default value equal to
10% of the fast-charge current (see Chapter 7.2: Pre-charge current on page 18). However it
can be adjusted by connecting a resistor from the IPRE pin to GND or VREF Figure 10. When the
resistor is connected from IPRE pin and GND, the current is higher than the default value. The
RPRE value is given by:
Figure 10. IPRE pin connection
When RPRE is connected to VREF, the current is lower than the default value. VREF is the
external reference equal to 1.8V, VBG is the internal reference equal to 1.23V and KPRE is a
constant equal to 950.Figure 11
The relationship is shown in the equation 8.2:
Figure 11. IPRE pin connection
PRG
BG
PRE
PRECH
BG
PRE
R
V
K
I
V
R
−
=
Eq: 8-1
L6924D
I
PRE
L6924D
I
PRE
PRE
PRECH
PRG
BG
BG
REF
PRE
K
I
R
V
V
V
R
−
−
=
Eq: 8-2
V
REF
L6924D
I
PRE
V
REF
L6924D
I
PRE



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