Battery Charger. CN3768 Datasheet

CN3768 Charger. Datasheet pdf. Equivalent

CN3768 Datasheet
Recommendation CN3768 Datasheet
Part CN3768
Description 12V Lead-Acid Battery Charger
Feature CN3768; CONSONANCE 4A, 12V Lead-Acid Battery Charger IC CN3768 General Descriptions: The CN3768 is a PWM sw.
Manufacture CONSONANCE
Datasheet
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CONSONANCE CN3768
CONSONANCE
4A, 12V Lead-Acid Battery Charger IC
CN3768
General Descriptions:
The CN3768 is a PWM switch-mode battery
charger controller for 12V lead-acid battery in a
small package using few external components.
The CN3768 is specially designed for charging
12V lead-acid battery with trickle charge, constant
current charge, over-charge and float charge mode.
In over-charge and float charge mode, the
regulation voltage is internally set. The constant
charge current is programmable with a single sense
resistor.
Deeply discharged batteries are automatically
trickle charged at 17.5% of the programmed
constant charge current until the cell voltage
exceeds 75% of the regulation voltage in
over-charge mode. The over-charge is terminated
once the charging current drops to 38% of the
constant charge current, then CN3768 will enter
float charge mode. A new charge cycle
automatically restarts if the battery voltage falls
below 83.95% of the over-charge voltage in
float-charge mode. CN3768 will automatically
enter sleep mode when input voltage is lower than
battery voltage.
Other features include undervoltage lockout and
status indication, etc.
CN3768 is available in a space-saving 8-pin SOP
package.
Applications:
Mobile Loadspeaker
Lead-Acid Battery Charger
UPS
Portable Industrial and
Medical Equipment
Standalone Battery Chargers
Features:
Wide Input Voltage: 6.6V to 30V
Complete Charger Controller for 12V
Lead-Acid Battery
Charge Current Up to 4A
High PWM Switching Frequency:
300KHz
Fixed Over-Charge Voltage
Charging Current is programmed
with a sense resistor
Automatic Conditioning of Deeply
Discharged Batteries
Automatic Recharge
Charger Status Indication
Soft Start
Battery Overvoltage Protection
Operating Ambient Temperature
40to 85
Available in 8 Pin SOP Package
Pb-free , RoHS Compliant,
and Halogen Free
Pin Assignment:
VG 1
GND 2
CHRG 3
COM 4
CN3768
8 DRV
7 VCC
6 CSP
5 BAT
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Rev.1.0



CONSONANCE CN3768
CONSONANCE
Typical Application Circuit:
Input Supply
C1
C2
100nF
M1
D1
*
18
VG
7 VCC
DRV
R1 CSP 6
BAT 5
D3 CN3768
3 CHRG
COM 4
GND
2
L
D2
R2
120
C4
220nF
RCS
C3 BAT
*: D1 can be omitted, refer to section Diode Selectionon Page 9
Figure 1 Typical Application Circuit
Ordering Information:
Part No.
CN3768
Package Type and Packing
SOP8, Tape and Reel, 2500/Reel
Operating Ambient Temperature
40to 85
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Rev.1.0



CONSONANCE CN3768
CONSONANCE
Pin Description:
Pin No.
1
2
3
4
5
6
7
8
Name
VG
GND
COM
BAT
CSP
VCC
DRV
Descriptions
Internal Voltage Regulator. VG internally supplies power to gate driver,
connect a 100nF capacitor between VG pin and VCC pin.
Ground. Negative terminal of input supply.
Open-Drain Charge Status Output. This pin is pulled low by an internal switch
if CN3768 is in trickle charge, constant current and over charge mode. In this pin
is in high impedance state.
Loop Compensation Input. Connect a 220nF capacitor in series with an 120Ω
resistor from this pin to GND.
Negative Input for Charge Current Sensing. This pin and the CSP pin measure
the voltage drop across the sense resistor RCS to provide the current signals
required. Battery voltage is also sensed through BAT pin.
Positive Input for Charge Current Sensing. This pin and the BAT pin measure
the voltage drop across the sense resistor RCS to provide the current signals
required.
External DC Power Supply Input. VCC is also the power supply for internal
circuit. Bypass this pin with capacitors.
Gate Drive Pin. Drive the gate of external P-channel MOSFET.
Absolute Maximum Ratings
Voltage from VCC, CHRG to GND…………………………………..…………….…0.3V to 33V
Voltage from DRV, VG to VCC…………………………………...……………8V to VCC0.3V
Voltage from CSP, BAT to GND……………………………………………..…..……0.3V to 28V
Voltage from COM to GND………………………………………………….…………….…….6.5V
Storage Temperature………………………………………….………..……..…...…65---150
Operating Ambient Temperature…………………………….…………..……….……40---85
Lead Temperature(Soldering, 10 seconds)……………………….…………………..…………260
Stresses beyond those listed under ‘Absolute Maximum Ratings’ may cause permanent damage to the device. These are stress
ratings only and functional operation of the device at these or any other conditions above those indicated in the operational
sections of the specifications is not implied. Exposure to Absolute Maximum Rating Conditions for extended periods may affect
device reliability.
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Rev.1.0







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