參數(shù)資料
型號(hào)： ADP2291
廠商： Analog Devices, Inc.
英文描述： Compact, 1.5 A Linear Charger for Single-Cell Li+ Battery
中文描述： 結(jié)構(gòu)緊湊，1.5 A的單線性充電器，電池鋰電池
文件頁(yè)數(shù)： 12/20頁(yè)
文件大?。?/td> 388K
代理商： ADP2291
ADP2291
APPLICATION INFORMATION
SETTING THE MAXIMUM CHARGE CURRENT
The maximum charge current is set by choosing the proper
current sense resistor, RS, and the voltage on the ADJ input. The
charger nominally regulates its output current at the point
where the voltage across the current sense resistor V
IN
–V
CS
(defined as V
RS
) is 150 mV. This setpoint voltage can be adjusted
by pulling down on the ADJ input, which is internally attached
through a 100 k
pull-up resistor to 3 V. Each volt of pull-down
from 3 V will reduce V
RS
by 67 mV during fast charge. A
minimum of 50 mV is reached when a 100 k
resistor is
attached between ADJ and ground. During slow charge the
voltage across the current sense resistor is 15 mV with no
connection to ADJ and drops to 10 mV with a 100 k
resistor
attached to ground. Therefore the maximum charge rate I
MAX
can be calculated as
Rev. 0 | Page 12 of 20
)
mΩ
(
)
mV
(
S
RS
MAX
R
V
I
=
(1)
where 50 mV ≤ V
≤ 150 mV
After determining suitable values for V
RS
and R
S
, the value of
V
ADJ
and R
ADJ
can be calculated as
V
V
V
RS
ADJ
mV
7
66
mV
50
)
mV
(
+
=
(2)
R
ADJ
= 100 k ×
ADJ
ADJ
V
V
V
3
(3)
Examples of resistor combinations are shown in Table 4.
Table 4. Examples of R
S
and R
ADJ
Selection
I
MAX
R
S
1.5 A
100 m
1 A
100 m
750 mA
100 m
500 mA
100 m
750 mA
200 m
500 mA
200 m
375 mA
200 m
250 mA
200 m
500 mA
300 m
333 mA
300 m
250 mA
300 m
167 mA
300 m
V
RS
150 mV
100 mV
75 mV
50 mV
150 mV
100 mV
75 mV
50 mV
150 mV
100 mV
75 mV
50 mV
V
ADJ
3 V
2.25 V
1.87 V
1.5 V
3 V
2.25 V
1.87 V
1.5 V
3 V
2.25 V
1.87 V
1.5 V
R
ADJ
Open
300 K
167 K
100 K
Open
300 K
167 K
100 K
Open
300 K
167 K
100 K
SETTING THE MAXIMUM CHARGE TIME
The maximum charge time is intended as a safety mechanism to
prevent the charger from trickle charging the cell indefinitely. It
does not terminate charging under normal charging conditions,
but only when there is a failure to reach end-of-charge. A typical
cell charges at a 1 C rate in about 1.5 hours, depending on the
cell type, temperature, and manufacturer. Generally, a three
hour time limit is sufficient to prevent a normal charge cycle
from being interrupted by the charge timer. It is recommended
that the cell manufacturer be consulted for timing details.
The maximum charge time is set by selecting the value of the
CTIMER capacitor. Calculate the timer capacitance using
CTIMER = t
CHG
(minutes) ×
minutes
1800
1
F
μ
(4)
The precharge and end-of-charge periods are 1/6 the duration
of the fast charge time limit. The charge timers are completely
disabled by connecting the TIMER pin to ground. If the timers
are disabled, the FAULT and TIMEOUT states are never
reached, so the timers should only be disabled if charging is
monitored and controlled externally.
EXTERNAL CAPACITORS
Use an input supply capacitor (CIN) with a value in the
1 μF to 10 μF range and place it close to the ADP2291. This
should provide adequate input bypassing, but the selected
capacitor should be checked in the actual application circuit.
Check that the input voltage does not droop or overshoot
excessively during the start-up transient.
Use a battery output capacitor (COUT) with a value of at least
10 μF. This capacitance provides compensation when no battery
load is present. In addition, the battery and interconnections
appear inductive at high frequencies and must be accounted for
when the charger is operated with a battery load. Therefore, a
small amount of output capacitance is necessary to compensate
for the inductive nature of the battery and connections. Use a
minimum output capacitance value of 1 μF for applications
where the battery cannot be removed.
REVERSE INPUT PROTECTION
The diode, D1, shown in Figure 22 through Figure 25 is
optional. It is only required if the input adapter voltage can
be applied with a reverse polarity.
If the adapter voltage is high enough, a Schottky diode is recom-
mended to minimize the voltage difference from the adapter to
the charger input and the power dissipation. Choose a diode
with a continuous current rating high enough to handle battery
charging current at the maximum ambient temperature. Use a
diode whose voltage rating is greater than the maximum
adapter voltage.
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