PW2902 Buck Circuit board
- 2023-05-12 15:05:19
- lu Original
- 375
1， Circuit board PCB description：
1.1 Name ： PW2902 Buck Circuit board
1.2 Applications ： Voltage buck converter board
1.3 VIN input voltage ： 8V-85V
1.4 VOUT output voltage ： 5V， 24V， 12V（ TheVIN>VOUT+3 condition must be met）
1.5 Introduction to ChipFunctions ：
1， Buck chip：PW2902
PW2902 input voltage is 8V~90V, you can set the constant voltage output voltage value by R1,R2, current up to 2A, output can be set in the range of 5V-30V,package ESOP8.
2 ， Circuit diagram：
Note 1： CIN,CF2 input capacitor and COUT output capacitor must not be omitted. At the same time，CIN,CF2 should be placed next to 1 pins, as close as possible..
Note 2： The value of R5 is set according to the input voltage, calculated according to the current about 1mA, and the output false load resistance. Ifthe current is 2mA, for example, the output is 24V, then the false load resistance is 12K (R12).
3， PCB diagram and 3Ddisplay diagram
4 ， BOM Materia List .
|
Comment |
Designator |
Footprint |
Quantity |
|
4.7UF 25V 0805 |
C1, C2 |
0805C |
2 |
|
0.1uF 100V 1206 |
CF1 |
1206C |
1 |
|
0.1uF 50V 0603 |
CF2 |
0603A |
1 |
|
100uF 100V SMD Aluminum Capacitors 10mm*10mm |
CIN |
SMD |
1 |
|
330uF 35V SMD Aluminum Capacitors 8mm*10mm |
COUT |
SMD |
1 |
|
SS510 SMB |
D1 |
SMD |
1 |
|
SS1100 SMA |
D2 |
SMD |
1 |
|
BZT52C27 SOD123 |
D3 |
SMD |
1 |
|
SMBJ100A |
D4(TVS) |
SMD |
1 |
|
47uH 1050 Integrated molded inductor |
L1 |
SMD |
1 |
|
2PIN alignment |
ON1, ON2, ON3, ON4, ON5, ON6, ON7 |
DIP |
7 |
|
25.5K 1% 0805 |
R1, R3 |
0805R |
2 |
|
309K 1% 0805 |
R2, R4 |
0805R |
2 |
|
68K 1% 1206 |
R5 |
1206R |
1 |
|
80R 1% 1206 |
R6 |
1206R |
1 |
|
80mR 1% 1206 |
R7 |
1206R |
1 |
|
NC |
R8 |
1206R |
1 |
|
18K 1% 0805 |
R9, R10 |
0805R |
2 |
|
6K 5% 0805 |
R11 |
0805R |
1 |
|
12K 5% 0805 |
R12 |
0805R |
1 |
|
6.49K 1% 0805 |
R13, R14 |
0805R |
2 |
|
2.5K 5% 0603 |
R15 |
0603SL |
1 |
|
PW2902 PWCHIP |
U1 |
ESOP8 |
1 |
