|
|
PDF CN3722 Data sheet ( Hoja de datos )
| Número de pieza | CN3722 | |
| Descripción | Multi-Chemistry Battery Charger IC | |
| Fabricantes | CONSONANCE | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de CN3722 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
CONSONANCE
5A, Multi-Chemistry Battery Charger IC
With Photovoltaic Cell MPPT Function
CN3722
General Descriptions:
The CN 3722(Note 1) is a PWM switc h-mode
battery charger controller that ca n be powere d
by ph otovoltaic cell w ith maximum p ower
point tra cking fu nction. The CN 3722 is
specially designed for charging 1 or m ulti-cell
lithium ion batteries or LiFePO4 batteries with
constant current and constant voltage mode. In
constant v oltage mode, th e regulation v oltage
is set by the ex ternal res istor d ivider. The
constant c harging c urrent is pro grammable
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.
CN3722 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.
CN3722 is available in a space-saving 16-pin
TSSOP package.
Applications:
The Charger Powered by Photovotaic cell
Electric Tools
Battery-Backup Systems
Standalone Battery Chargers
Note 1: Patent Pending
Features:
Photovoltaic Cell Ma ximum Power
Point Tracking
Wide Input Voltage: 7.5V to 28V
Complete Ch arger C ontroller for 1
or multi-cell Lithium-ion Battery or
LiFePO4 Battery
Charge Current Up to 5A
High PWM Switching Fr equency:
300KHz
Constant Charging V oltage Se t By
the External Resistor Divider
Charging Current is programmed
with a sense resistor
Automatic C onditioning of Deeply
Discharged Batteries
Battery Temperature Monitoring
2 Status Indications
Soft Start
Battery Overvoltage Protection
Operating Ambient Temperature
－40℃ to ＋85℃
Available in 16 Pin TSSOP Package
Pb-free , RoHS Compliant,
and Halogen Free
Pin Assignment:
VG 1
PGND 2
GND 3
CHRG 4
DONE 5
TEMP 6
MPPT 7
COM1 8
CN3722
16 DRV
15 VCC
14 BAT
13 CSP
12 NC
11 COM3
10 FB
9 COM2
www.consonance-elec.com
Rev.1.1
1
http://www.Datasheet4U.com
1 page  
CONSONANCE
Electrical Characteristics:(Continued from last page)
Parameters
Symbol
Conditions
Min
DRV Pin
VDRV High (VCC－VDRV) VH IDRV＝－10mA 60
VDRV Low (VCC－VDRV)
VL I DRV＝0mA
5
Rise Time
Fall Time
tr Cload＝2nF, 10% to 90%
tf Cload＝2nF, 90% to 10%
30
30
Note 2: VREG is the regulation voltage at BAT pin in constant voltage mode
T yp Max
6 .5 8
4 0 65
4 0 65
Unit
mV
V
ns
ns
Detailed Description:
The CN3722 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.
To restart the charge cycle, just remove and reapply the input voltage. Also, a new charge cycle will
automatically begin if the battery voltage drops below the recharge threshold voltage of 95.8%×VREG.
When the input voltage is not present, the charger goes into sleep mode.
A 10kΩ NTC (negative temperature coefficient) thermistor can be connected from the TEMP pin to ground for
battery temperature qualification. The charge cycle is suspended if the battery’s temperature is outside of the
acceptable range.
An overvoltage comparator guards against voltage transient overshoots (>8% of regulation voltage). In this case,
P-channel MOSFET are turned off until the overvoltage condition is cleared. This feature is useful for battery
load dump or sudden removal of battery.
The charging profile is shown in Figure 2.
www.consonance-elec.com
Rev.1.1
5
5 Page 
CONSONANCE
diode and the pass transistor should also be kept as short as possible.
(2) The compensation capacitor connected at the COM1, COM2 and COM3 pins should return to the analog
ground pin of the IC. This will prevent ground noise from disrupting the loop stability.
(3) Since MPPT pin’s voltage is a function of ambient temperature, while designing the PCB, CN3722 should
be kept away from the heat source such as diodes, MOSFET, etc.
(4) Output capacitor ground connections need to feed into same copper that connects to the input capacitor
ground before tying back into system ground.
(5) Analog ground and power ground(or switching ground) should return to system ground separately.
(6) The ground pins also works as a heat sink, therefore use a generous amount of copper around the ground
pins. This is especially important for high VCC and/or high gate capacitance applications.
(7) Place the charge current sense resistor RCS right next to the inductor output but oriented such that the IC’s
CSP and BAT traces going to RCS are not long. The 2 traces need to be routed together as a single pair on the
same layer at any given time with smallest trace spacing possible.
(8) The CSP and BAT pins should be connected directly to the current sense resistor (Kelvin sensing) for best
charge current accuracy. See Figure 4 as an example.
Figure 4 Kelvin Sensing of Charge Current
www.consonance-elec.com
Rev.1.1
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet CN3722.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| CN3722 | Multi-Chemistry Battery Charger IC | CONSONANCE |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |