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부품번호 | CN3722 기능 |
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기능 | Multi-Chemistry Battery Charger IC | ||
제조업체 | CONSONANCE | ||
로고 | |||
전체 12 페이지수
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
CONSONANCE
Electrical Characteristics:
(VCC=15V, TA=-40℃ to 85℃, unless otherwise noted)
Parameters
Symbol
Conditions
Input Voltage Range
VCC
Undervoltage lo
Threshold
ckout
UVLO
Operating Current
Feedback Voltage
FB Pin Bias Current
Current Sense Voltage
(VCSP-VBAT)
Current into BAT Pin
Precharge Threshold
Recharge Threshold
Overvoltage Trip Level
Overvoltage Clear Level
IVCC
VFB
IFB
VCS
IBAT
VPRE
VRE
Vov
Vclr
No switching
FB pin,Constant voltage mode
VFB=2.4V
VBAT>66.7%×VREG
VBAT<66.7%×VREG
VBAT=12V
VBAT rising
VBAT falling
VBAT rising
VBAT falling
MPPT Pin
MPPT Regulation Voltage
VMPPT TC
MPPT Pin Bias Current
VMPPT
TCMPPT
IMPPT
Maximum power point tracking
Maximum power point tracking
TEMP Pin
Pull up Current
High Threshold
Iup
Vthh
TEMP Voltage Rising
Low Threshold
Vthl TEMP Voltage Falling
CHRG Pin
CHRG Pin Sink Current
CHRG Leakage Current
DONE Pin
DONE Sink Current
DONE Leakage Current
Oscillator
Switching Frequency
Maximum Duty Cycle
ICHRG
ILK1
VCHRG=1V, charge mode
VCHRG=25V,termination mode
IDONE
ILK2
VDONE=1V, termination mode
VDONE=25V, charge mode
fosc
Dmax
Sleep Mode
Sleep Mode Threshold
(measure VCC-VBAT)
Sleep mode Release
Threshold
(measure VCC-VBAT)
VSLP V CC falling
VSLPR VCC rising,
VBAT=8V
VBAT=12V
VBAT=18V
VBAT=8V
VBAT=12V
VBAT=18V
Min T yp Max
Unit
7.5 28 V
4.2 6
7.3 V
1
2.392
190
18
5
1.06
0.98
1.55
2 .416
50
200
30
10
66.7%
95.8%
1 .08
1
2.1
2.44
3 00
21 0
42
15
1. 1
1.0 2
mA
V
nA
mV
uA
VREG
(Note2)
1.0
-100
1.04 1 .08 V
-0.4%
/℃
0 +100 nA
41
1.57
0.145
50
1. 61
0 .175
65
1.65
0.205
uA
V
V
7 1 2 18 mA
1 uA
7 1 2 18 mA
1 uA
240 30 0
94
360 kHZ
%
0.06 0. 1
0.14
0.1 0.14 0.18 V
0.18 0. 23 0.28
0.26 0. 32 0.39
0.32 0. 42 0.52 V
0.38 0. 47 0.58
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Rev.1.1
4
4페이지 CONSONANCE
CN3722 Powered By Both AC Adaptor and Photovoltaic Cell
Both AC adaptor and photovoltaic cell can be used to power CN3722. The charge current can be set based on
AC adaptor’s capability which is generally larger than that of photovoltaic cell. When photovoltaic cell is used,
CN3722 can automatically adjust the charge current to the photovoltaic cell’s maximum power point current. It
should be noted that AC adaptor’s output voltage should be no less than the photovoltaic cell’s MPPT voltage.
Trickle Charge Mode
At the beginning of a charge cycle, if the battery voltage is below 66.7%×VREG, the charger goes into trickle
charge mode with the charge current reduced to 15% of the full-scale current.
Charge Current Setting
The full-scale charge current, namely the charge current in constant current mode, is decided by the following
formula:
Where: I CH is the full scale charge current
RCS is the resistor between the CSP pin and BAT pin
Charge Termination
In constant voltage mode, the charge cycle will be terminated once the charge current decreases to 9.5% of the
full-scale current.
Automatic Battery Recharge
After the charge cycle is completed and both the battery and the input power supply (wall adapter) are still
Connected, a new charge cycle will begin if the battery voltage drops below 95.8%×VREG due to self-discharge
or external loading. This will keep the battery capacity at more than 90% at all times without manually restarting
the charge cycle.
Battery Temperature Monitoring
A negative temperature coefficient (NTC) thermistor located close to the battery pack can be used to monitor
battery temperature and will not allow charging unless the battery temperature is within an acceptable range.
Connect a 10kΩ thermistor from the TEMP pin to ground. Internally, for hot temperature, the low voltage
threshold is set at 175mV which is equal to 50℃(RNTC≈3.5kΩ). For cold temperature, the high voltage
threshold is set at 1.61V which is equal to 0℃(RNTC≈32kΩ) with 50uA of pull-up current.
Once the temperature is outside the window, the charge cycle will be suspended, and the charge cycle resumes if
the temperature is back to the acceptable range.
The TEMP pin’s pull up current is about 50uA, so the NTC thermistor’s resistance should be 10kΩ at 25℃,
about 3.5kΩ at hot temperature threshold, and about 32kΩ at cold temperature threshold. The NTC thermistor
such as TH11-3H103F, MF52(10 kΩ), QWX-103 and NCP18XH103F03RB can work well with CN3722. The
above mentioned part numbers are for reference only, the users can select the right NTC thermistor part number
based on their requirements.
If battery temperature monitoring function is not needed, just connect a 10KΩ resistor from TEMP pin to GND.
Status Indication
The CN3722 has 2 open-drain status outputs:
and .
is pulled low when the charger is in
charging status, otherwise
bec omes high impedance.
is pulled low if the charger is in charge
termination status, otherwise
becomes high impedance.
When the battery is not present, the charger charges the output capacitor to the regulation voltage quickly, then
the BAT pin’s voltage decays slowly to recharge threshold because of low leakage current at BAT pin, which
results in a ripple waveform at BAT pin, in the meantime,
pin outputs a pulse to indicate that the
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Rev.1.1
7
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부품번호 | 상세설명 및 기능 | 제조사 |
CN3722 | Multi-Chemistry Battery Charger IC | CONSONANCE |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |