Compatible with PD fast charging high voltage two series 8.4V lithium battery 1A charging board
- 2023-05-12 15:10:41
- lu Original
- 244
The nominal voltage of the two stringsof lithium battery is 7.4V lithium battery pack, but the actual voltage is 6Vdischarge to 8.4V full charge, so the output power supply voltage is 6V-8.4V.Our usual management control for the two strings of lithium battery is to use5V pure boost mode, and the charger can output 5V. However, the voltage of thefast-charging device is 5V,9V,12,20V, etc., if it needs to be compatible withthe high-voltage input of the fast-charging device, such as the input of 5V and9V, it needs the voltage lifting charge management chip. At present, the costof the voltage lifting product is high. you canfirst use the following way to use, you can also use the collection chip withboost function PW4000 products.
1 Circuit board PCB description：
1.1 Name ： Compatible with PD fast charging high voltagetwo series 8.4V lithium battery 1A charging board
1.2 Battery pack: 7.4Vlithium battery pack, multiple parallel or two series connection, full 8.4V
1.3 Input voltage: 5V-12V Max charging current ： 1A（ When charging, the light will be on, and when it is fully charged, thelight will turn）
1.4 Introduction to Chip Functions ：
1， Lithium battery charging circuit：PW4202
PW4202 Lithium battery charge management chip， Up to 3.5Acharging current， switching type high efficiency, support two series lithium batterycharging.
2， DC-DC synchronous step-down circuit：PW2303
PW2303 Synchronous Buck Chip， Input 30V-5V, output5V, up to 3A, characterized by voltage step-down voltage difference is verylow, and high efficiency.
3， USB C port PD fast charge Protocol chip： PW6603
PW6603 is a PD fast charge protocol chip, SINK terminal, responsiblefor protocol communication PD charger to output its specified voltage
2， Circuit diagram ：
PCB layout is dividedinto two parts: signal controlcircuit + power circuit
Note 1： The blue thick line is the power trace, the layout should bewide； SW part (The connection point of L2,D1 and Q1 ofPW4202) is not only the power output, but also it is a noise source, the layoutshould be wide and the area should be small.
Note 2： The red thick line is the power ground,the main points of the drawing board: to be wide, the shorter the distance between the connecting loops at each point, the more holes are punched in theground. (Input, C1, C2, PW2303 pin 7/8, C3, C7, C6, C8, C9, Q1 and the batteryground)
3， PCB diagram and 3Ddisplay diagram
4 ， BOM Material List .
|
Comment |
Designator |
Footprint |
Quantity |
|
100uF 25V 6.3*7.7mm Electrolytic capacitance |
C1 |
6.3*7.7mm |
1 |
|
0603 25V 0.1uF |
C2, C7 |
0603A |
2 |
|
330uF 16V 8*10mm Electrolytic capacitance |
C3 |
8*10mm |
1 |
|
0603 50V 220pF |
C4 |
0603A |
1 |
|
0603 25V 1uF |
C5, C10 |
0603A |
2 |
|
0805 25V 22UF |
C6, C8, C9 |
0805C |
3 |
|
SS34 SMB |
D1 |
SMB |
1 |
|
Plug-in ring type iron-silicon aluminum 47UH，Wire diameter above 0.7 |
L1 |
DIP |
1 |
|
Integrated molded inductor 0650-6.8UH |
L2 |
SMD |
1 |
|
0603 LED Red |
LED2 |
0603A |
1 |
|
0603 LED Green |
LED1 |
0603A |
1 |
|
PW4406 PWCHIP MOS tube |
Q1 |
SOP8 |
1 |
|
0603 1% 100K |
R1 |
0603SL |
1 |
|
0603 1% 24.9K |
R2 |
0603SL |
1 |
|
0603 5% 10R |
R4 |
0603SL |
1 |
|
0603 1% 30K for input 9V，or 120K for input12V |
R5 |
0603SL |
1 |
|
1210 1% 60mR |
R7 |
1206R |
1 |
|
0603 1% 220k |
R8 |
0603SL |
1 |
|
0603 5% 1k |
R9, R10 |
0603SL |
2 |
|
0603 1% 0R |
R11 |
0603SL |
1 |
|
0603 1% 20R |
R12 |
0603SL |
1 |
|
PW2303 PWCHIP Buck chips |
U1 |
SOP8 |
1 |
|
PW6603 PWCHIP Fast Chips |
U2 |
SOT23-6 |
1 |
|
PW4202 PWCHIP charge chip |
U3 |
SOP8 |
1 |
|
USB TYPE C 16PIN |
USB1 |
USB |
1 |
