Two series lithium battery charging and discharging boards,5V2A output, input 5V-24V charging

2023-05-12 14:57:46
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1 Circuit board PCB description

1.1  Name Two series lithium battery charging anddischarging boards,5V2A output, input 5V-24V charging

1.2  Applications:Convenient charging  devices, etc.

1.3  Battery pack: 7.4V lithium battery pack,multiple parallel or two series connection, full 8.4V

1.4  Input DC): 5-24VWhen charging, the light will be on, and when it is fully charged,the light will turn, and the light will flash without connecting the battery

1.5  OutputUSB2): 5V2.4A (Maximum 3A)

1.6  Introduction to Chip  Functions

1, B lithium battery charging circuit PW4584

PW4584 is a  lithium battery charging management chip, built-in MOS, up to output 8.4V 1Acharging, support 5V input boost two series lithium battery charging.

2 , DC-DC Buck chip PW2303

PW2303 is a DC-DCbuck chip, 130Khz operating frequency, its input and output no-load 0 voltagedifference. Features: adjustable current  limit, commonly used in 5V input 5Voutput, while the input will have higher than 5V voltage regulation. Up to 3Aoutput.

3 A lithium battery protection circuit PW7052

PW7052 is a two  series lithium battery overcharge, overdischarge, overcurrent detection  protection circuit chip, parallel MOS can increase the overcurrent protection  value.

4 Lithium battery output circuitPW2163

PW2163 is a DC-DCbuck constant voltage chip, input 4.5V-18V, adjustable constant voltage outputvoltage value, output up to 3A or 5A current.


2, Circuit diagram


PCB layout is divided into two parts: signal controlcircuit + power circuit

Note 1: Theblue  thick line is the power trace, the layout should  be wide,SW part (PW2303,PW4584,PW2163) is not only the power  output, but alsoit is a noise source, the layout should be wide and the area should be small.

Note 2: Thered  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 the ground.

2, PCB diagram and 3Ddisplay diagram

  

4 BOM Material List                                            .

Comment

Designator

Quantity

100uF 25V 6.3*7.7mm Electrolytic capacitance

C1

1

0603 50V 0.1uF

C2

2

470uF 16V 8*10mm Electrolytic capacitance

C3

1

0603 50V 220pF

C4

1

NC

C5, C8, C16

3

0805 25V 22UF

C6, C9, C12, C15, C19, C20

6

0603 0.1UF 16V

C7, C10, C11, C13, C14, C17, C18,

7

SS34 SMB Good quality

D1

1

Plug-in ring type iron-silicon aluminum 47UH,Wire diameter above 0.7

L1

1

PWCHIP 0850-6.8UH

L2

1

PWCHIP 0850- 3.3UH

L3

1

0603 LED Red

LED1

1

PW8205A8TS PWCHIP

Q1, Q2

2

0603 1% 100K

R1

1

0603 1% 24.9K

R2

1

0603 5% 10R

R3

1

0603 4.99R 1%

R4

1

0603 1% 6.8K

R5

1

0603 1% 1k

R6, R15

1

0603 1% 270k

R7

1

0603 1% 100K

R8

1

0603 330R 1%

R9, R10

3

0603 200K 1%

R13

1

0603 26K 1%

R14

1

PW2303 PWCHIP

U1

1

PW4584 PWCHIP

U2

1

PW7052 PWCHIP

U3

1

PW2163 PWCHIP

U4

1

PL515 USB Intelligent charging protocol

U5

1

USB A

USB1

1

Note: Materials for additional LDO circuit parts are notincluded.

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