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ACT2813 数据表(PDF) 13 Page - Active-Semi, Inc

部件名 ACT2813
功能描述  5V/2.4A Power Bank Solution
PDF  23 Pages
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制造商  ACTIVE-SEMI [Active-Semi, Inc]
网页  http://www.active-semi.com
标志 ACTIVE-SEMI - Active-Semi, Inc

ACT2813 数据表(HTML) 13 Page - Active-Semi, Inc

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Rev 2, 19-May-15
Innovative PowerTM
- 13 -
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
ACT2813/ACT2813C
Boost Output Constant Current
Boost output current is set by a resistor connected
from IOST pin to AGND as shown in Figure 8. The
boost output current is estimated as the following
equation:
Figure 9 gives out boost output current with various
RIOST.
The IOST pin voltage is proportional to output
current until output current is limited, as shown in
Figure 10.
Battery Impedance Compensation
An
external resistor is used to set the impedance
from 40mΩ to 500mΩ as shown in Figure 11. RIMC
is corresponding to battery impedance. Higher RIMC
gives higher compensation voltage which is
positively proportional to battery charge/discharge
current.
Select RIMC based on battery impedance:
The battery impedance as shown in the table 4
according to the RIMC and Rcs:
Table 4: Battery Impedance
Boost Output Plug-in Auto Detection
Figure 12 provides a solution for auto plug-in
detection.
External Input Over Voltage Protection
Considering the maximum voltage rating at VIN pin,
the external OVP circuit as shown in Figure 13 is
recommended if input voltage may go higher than
7V. With the enhanced OVP circuit, the design can
pass UN38.3.
)
(m
s
Rc
)
(k
R
)
A
(
3
2
(A)
I
OST
I
IOST
Ω
Ω
×
=
(3)
Figure 8.
Boost output current setting circuit
Figure 9.
Boost output current setting
2.5
2.0
1.5
1.0
0.5
0
3.0
RIOST (kΩ)
0
20
40
60
80
120
100
VBAT = 3.7V
CVout=4.5V
750
600
450
300
150
0
900
Output Current(A)
0
0.4
0.8
1.2
1.6
2.0
2.4
2.8
Figure 10.
VIOST VS. output current
VBAT = 3.7V
RIOST=100kΩ
)
(m
cs
R
)
(m
R
25
)
(k
RIMC
Ω
Ω
Ω
×
=
(5)
(4)
Figure 11.
Battery impedance compensation setting circuit
3
-
BAT
BAT
10
)
m
(
R
)
A
(
I
)
V
(
BAT
)
V
(
V
×
×
−
=
Ω
RIMC(KΩ)
50
100
200
Battery
Impedance
R(mΩ)
Rcs=25mΩ
50
100
200
Rcs=50mΩ
100
200
400
Figure 12.
Boost output auto detection circuit
Figure 13.
Input over voltage protection



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