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ACT2823 Fiches technique(PDF) 17 Page - Active-Semi, Inc

No de pièce ACT2823
Description  Dual Cell Li-Ion Battery Charger and Power Bank Manager
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Fabricant  ACTIVE-SEMI [Active-Semi, Inc]
Site Internet  http://www.active-semi.com
Logo ACTIVE-SEMI - Active-Semi, Inc

ACT2823 Fiches technique(HTML) 17 Page - Active-Semi, Inc

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ACT2823
REV 1, 01-DEC-2016
Innovative PowerTM
ActiveSwitcherTM
is a trademark of Active-Semi.
17
The following equations calculate the proper external
resistor network to set the upper and lower charging
temperature thresholds.
)
8
(
hot
Rc
I
V
CHG
TCL
)
9
(
cold
R
I
V
CHG
TCH
)
10
(
R
Ra
R
Ra
Rb
hot
NTCh
NTCh
Rc
)
11
(
R
Ra
R
Ra
Rb
cold
NTCc
NTCc
R
From (7) (8) (9) and (10) calculate Ra and Rb in charge
mode, as the same method, the resistors in discharge
mode can be calculated.
For example, using an NXRT15XH103 NTC resistor
and a temperature charging range of 0
to 45 ,we
know RNTCC=27.219k and 4.917k at 0 and 45
respectively.
We
can
calculate
Ra=33kΩ
and
Rb=2.87kΩ based on the above formulas. Follow this
procedure for any other NTC and charging temperature
range. If temperature sensing is not used, connect TH
to ground through a 10kΩ resistor.
I2C Serial Interface
The ACT2823 provides the user with the ability to
change operating parameters via I2C commands. The
Customer Register Map section of the datasheet shows
the parameters that can be modified. All changes to I2C
registers are volatile. All registers reset to their default
settings when power is recycled.
The ACT2823 operates as a slave device, and is ad-
dressed using a 7-bit slave address of 0x5Ah, followed
by an eighth bit, which indicates whether the transaction
is a read-operation or a write-operation, 1011010x. “x”
is a 0 for write operation and 1 for a read operation. Use
address 0xB4h for write operations and 0xB5h for read
operations.
There is no timeout function in the I2C packet pro-
cessing state machine, however, any time the I2C state
machine receives a start bit command, it immediately
resets the packet processing, even if it is in the middle
of a valid packet.
APPLICATION INFORMATION
Inductor Selection
The ACT2823 uses current-mode control and a
proprietary internal compensation scheme to simplify
external component selection. It is optimized for
operation with 4.7μH inductors. Choose an inductor with
a low DC-resistance, and avoid inductor saturation by
choosing inductors with DC ratings that exceed the
maximum output current by at least 30%. Design for an
inductor ripple current that is approximately 30% of the
maximum output current. The following equation
calculates the inductor ripple current is
1
12
Where VOUT is the 5V output voltage, VBAT is the battery
voltage, FSW is the switching frequency, and L is the
inductor value.
Output Capacitor Selection
VOUT requires high quality, low-ESR, ceramic
capacitors. Three 22uF capacitors are typically suitable.
An additional smaller 0.1uF capacitor assists with high
frequency filtering. Smaller capacitors can be used with
smaller loads but the capacitance should not go below
44uF for stability reasons. Choose the capacitance to
keep the output ripple voltage less than approximately
50mV. The following equation calculates the output
voltage ripple.
VRIPPLE
8∗
13
Be sure to consider the capacitor’s DC bias effects and
maximum ripple current rating when using capacitors
smaller than 0805.
A capacitor’s actual capacitance is strongly affected by
its DC bias characteristics. The output capacitor is
typically an X5R, X7R, or similar dielectric. Use of Y5U,
Z5U, or similar dielectrics are not recommended due to
their wide variation in capacitance over temperature and
voltage ranges.
Input Capacitor Selection
The input capacitor on VIN requires a high quality, low-
ESR, ceramic input capacitor. A 22uF capacitor is
typically suitable, but this value can be increased
without limit. Smaller capacitor values can be used with
lighter output loads. Choose the input capacitor value to
keep the input voltage ripple less than 50mV.
Battery Capacitor Selection
The BAT pin requires high quality, low-ESR, ceramic
capacitors. Two 22uF capacitors are typically suitable.
An additional smaller 0.1uF capacitor assists with high
frequency filtering. Smaller capacitors can be used with
smaller loads but the capacitance should not go below
22uF. These capacitors are the output capacitors to the
charging boost converter and the input capacitors to a
discharging buck converter, so they must be placed as
close as possible to the BAT pin and be directly to the
PGND plane. Choose the capacitance to keep the
ripple voltage less than 50mV. Use the following
equation to calculate the minimum input capacitance.


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