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PDF ACE4722 Data sheet ( Hoja de datos )
| Número de pieza | ACE4722 | |
| Descripción | Multi-Chemistry Battery Charger IC | |
| Fabricantes | ACE Technology | |
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ACE4722
5A, Multi-Chemistry Battery Charger IC With Photovoltaic Cell MPPT Function
Description
The ACE4722(Note 1) is a PWM switch-mode battery charger controller that can be powered by
photovoltaic cell with maximum power point tracking function. The ACE4722 is specially designed for
charging 1 or multi-cell lithium ion batteries or LiFePO4 batteries with constant current and constant
voltage mode. In constant voltage mode, the regulation voltage is set by the external resistor divider. The
constant charging current is programmable with a single current sense resistor.
Deeply discharged batteries are automatically trickle charged at 15% of the programmed constant
charging current until the cell voltage exceeds 66.7% of the regulation voltage. In constant voltage mode,
the charging current decreases gradually, the charge cycle will be terminated when the charging current
drops to 9.5% of the full-scale current, and a new charge cycle automatically restarts if the battery voltage
falls below 95.8% of the regulation voltage in constant voltage mode.
ACE4722 will automatically enter sleep mode when input voltage is lower than battery voltage. Other
features include undervoltage lockout, battery temperature monitoring and status indication, etc.
Features
Photovoltaic Cell Maximum Power Point Tracking
Wide Input Voltage: 7.5V to 28V
Complete Charger Controller for 1 or multi-cell Lithium-ion Battery or LiFePO4 Battery
Charge Current Up to 5A
High PWM Switching Frequency: 300KHz
Constant Charging Voltage Set By the External Resistor Divider
Charging Current is programmed with a sense resistor
Automatic Conditioning of Deeply Discharged Batteries
Battery Temperature Monitoring
2 Status Indications
Soft Start
Battery Overvoltage Protection
Operating Ambient Temperature -40℃ to ＋85℃
Application
The Charger Powered by Photovotaic cell
Electric Tools
Battery-Backup Systems
Standalone Battery Chargers
Note 1: Patent Pending
VER 1.2 1
1 page  
ACE4722
5A, Multi-Chemistry Battery Charger IC With Photovoltaic Cell MPPT Function
DONE Sink Current
DONE Leakage Current
IDONE
ILK2
DONE Pin
VDONE=1V, termination
mode
VDON=25V, charge mode
Oscillator
Switching Frequency
fosc
Maximum Duty Cycle
Dmax
Sleep Mode
Sleep Mode Threshold
(measure VCC-VBAT)
Sleep mode Release Threshold
(measure VCC-VBAT)
VSLP
VSLPR
VCC falling
VCC rising
DRV Pin
VBAT=8V
VBAT=12V
VBAT=18V
VBAT=8V
VBAT=12V
VBAT=18V
VDRV High (VCC-VDRV)
VDRV Low (VCC-VDRV)
Rise Time
Fall Time
VH IDRV=-10mA
VL IDRV=0mA
tr Cload=2nF, 10% to 90%
tf Cload=2nF, 90% to 10%
Note 2: VREG is the regulation voltage at BAT pin in constant voltage mode
7
240
0.06
0.1
0.18
0.26
0.32
0.38
5
30
30
12
300
94
0.1
0.14
0.23
0.32
0.42
0.47
60
6.5
40
40
18
1
360
0.14
0.18
0.28
0.39
0.52
0.58
8
65
65
mA
uA
kHZ
%
V
V
mV
V
ns
ns
Detailed Description
The ACE4722 is a constant current, constant voltage battery charger controller that can be powered by
the photovoltaic cell with maximum power point tracking function, the device is specially designed for 1 or
multi-cell Li-Ion battery or LiFePO4 batteries. The charge current is set by an external sense resistor
(RCS) across the CSP and BAT pins. The final battery regulation voltage VREG in constant voltage mode is
set by the external resistor divider.
A charge cycle begins when the following 3 conditions are met:
(1) The voltage at VCC pin rises above the UVLO level
(2) The voltage at VCC pin is greater than the battery voltage by sleep mode release threshold VSLPR
(3) The voltage at VCC pin is no less than the maximum power point voltage set by the external resistors
At the beginning of the charge cycle, if the battery voltage is less than 66.7%*VREG, the charger goes into
trickle charge mode. The trickle charge current is internally set to 15%(Typical) of the full-scale current.
When the battery voltage exceeds 66.7%*VREG, the charger goes into the full-scale constant current
charge mode. In constant current mode, the charge current is set by the external sense resistor RCS and
an internal 200mV reference, so the charge current equals to 200mV/RCS. When the battery voltage
approaches the regulation voltage, the charger goes into constant voltage mode, and the charge current
will start to decrease. In constant voltage mode, the charge cycle will be terminated once the charge
current decreases to 9.5% of the full-scale current. During the charge termination status, the DRV pin is
pulled up to VCC, and an internal comparator turns off the internal pull-down N-channel MOSFET at the
pin, another internal pull-down N-channel MOSFET at the pin is turned on to indicate the termination
status.
VER 1.2 5
5 Page 
ACE4722
5A, Multi-Chemistry Battery Charger IC With Photovoltaic Cell MPPT Function
Diode Selection
The diodes D1 and D2 in Figure 1 are schottky diode, the current rating of the diodes should be at least
the charge current limit, the voltage rating of the diode should exceed the maximum expected input
voltage.
The diode that is much larger than that is sufficient can result in larger transition losses due to their larger
junction capacitance.
Disable Charging with TEMP Pin
The charging can be disabled with TEMP pin, as shown in Figure 3：
ACE4722
Note：M1 is N-Channel MOSFET
Figure 3 Disable Charging With TEMP Pin
When control signal is high, N-channel MOSFET M1 is turned on, the voltage at TEMP pin is pulled
down to GND, which will disable the charging;
When control signal is low, N-channel MOSFET is turned off, the voltage at TEMP pin is determined by
NTC thermistor, which performs normal battery temperature monitoring function.
About Battery Current In Sleep Mode
In the typical application circuit shown in Figure 1, when input voltage is powered off or lower than
battery voltage, ACE4722 will enter sleep mode. In sleep mode, the battery current includes:
(1) The current into BAT pin and CSP pin, which is about 10uA(VBAT＝12V).
(2) The current from battery to VCC pin via diode D1, which is determined by D1’s leakage current.
The current will charge capacitance C1 at VCC pin, which will make VCC voltage a bit higher. To avoid
erratic operation, a resistor in parallel with C1 can be needed to discharge the capacitance, the
resistor value is determined by diode D1’s leakage, generally speaking, a 20KΩ resistor can achieve
the task.
(3) The current from battery to GND via diode D2, which is also determined by D2’s leakage current.
VER 1.2 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet ACE4722.PDF ] | |
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