12V-24V input two series lithium battery 2A charging management board
- 2023-05-12 15:10:26
- lu Original
- 197
1 Circuit board PCB description：
1.1 Name ： 12V-24V input twoseries lithium battery 2A charging management board
1.2 Applications:Convenient charging devices, etc.
1.3 Battery pack: 7.4Vlithium battery pack, multiple parallel or two series connection, full 8.4V
1.4 Input voltage: 5V-12V（ When charging, the light will be on, and when it is fully charged, thelight will turn）
1.5 Max charging current： 2A
1.6 Introduction to Chip Functions ：
1， Lithium battery charging circuit：PW4242
PW4242 battery charge management chip， Up to 3.5A charging current， switching typehigh efficiency, support two series lithium battery charging.
2， Circuit diagram ：
PCB layout is divided into two parts: signal controlcircuit + power circuit
Note 1： The blue thick line is the power trace, the layout should be wide,； SW part (Q1, D1, L1 three devices connected) is not only the poweroutput, but also it is a noise source, the layout should be wide and the area shouldbe small.
Note 2： The red thick line is the power ground, the main points of the drawing board: to bewide, the shorter the distance between the connecting loops at each point, themore holes are punched in the ground.(input, D1, C3, C1,C4,C7 and batteryground)
3
，
PCB diagram and 3D display diagram
4 ， BOM Material List .
|
Comment |
Designator |
Footprint |
Quantity |
|
0.1uF 50V 0603 |
C1 |
0603A |
1 |
|
0805 50V 10uF |
C2 |
0805C |
1 |
|
100UF 35V Electrolytic capacitance 6.3mm |
C3 |
6.3mm |
1 |
|
0805 25V 22uF |
C4, C7 |
0805C |
2 |
|
1uF 50V 0603 |
C5 |
0603A |
1 |
|
0.22uF 25V 0603 |
C6 |
0603A |
1 |
|
SS34 SMB |
D1 |
SMB |
1 |
|
Integrated molded inductor 1050 47uH |
L1 |
SMD |
1 |
|
0603 LED灯 Red |
LED1, LED2 |
0603A |
2 |
|
PW4435 PWCHIP MOS tube |
Q1 |
SOP8 |
1 |
|
0805 4.7R 5% |
R1 |
0805R |
1 |
|
60mR 1% 1210 |
R3 |
1206R |
1 |
|
1K 5% 0603 |
R4 |
0603SL |
1 |
|
120R 5% 0603 |
R5 |
0603SL |
1 |
|
100R 1% 0603 |
R5, R6 |
0603SL |
2 |
|
0R 1% 0603 |
R7 |
0603SL |
1 |
|
PW4242 PWCHIP charge chip |
U1 |
SSOP10 |
1 |
