Hi All
I bought 10 parts of B6287, (new sealed in tape), in the internet site from China, but in true, I bought the MT3608 and they shipped me this on.
I asked money back and got because item was not as described.
After some time, I did a test with it in my lab.
I did a PCB as need, I bought the parts need and mount the PCB as need.
In the net, people tell about it be the same as the part SY7208 and others tell be same as others.
In true, it looks be unique and no datasheet up in the internet for download.
It works fine if not load but lost voltage if get a load.
You can read the only one I found link below, after translate with the Google Chrome:
https://misoji-engineer.com/archives/6037806.html
If someone can try to solve the unexpected response, the no power, please, give us your contribution.
Annexed:
Schematic,
PCB,
Oscilloscope Print
PCB Pic x 3
Chip Pic x 3 (both side),
Tape Pic x 1
Condition:
2 x AA Alkaline,
1 x 1N4148 to protection,
1 x 62 ohms resistor load,
Information:
Chip print: B6287Z
Oscilloscope: OWON SDS7102V full band:
Chanel 1 Red: Tuned for -1V connected to input
Chanel 2 Yellow: Tuned for -1V Connected to output
Horizontal: 200us
Inductor: 22 uH CD43
Diode: SS310
Input caps: 3.000 uF Electrolytic + onboard 10 uF ceramic
Output caps: 2 x 10 uF
VOUT = VREF x (1+R1/R2)
Internal Vref = 0.6 V
Output without load, 5.1 V
Output power with load (62R): 47mA
Oscilloscope show 647.408 Hz in the output
Thank you in advance.
I bought 10 parts of B6287, (new sealed in tape), in the internet site from China, but in true, I bought the MT3608 and they shipped me this on.
I asked money back and got because item was not as described.
After some time, I did a test with it in my lab.
I did a PCB as need, I bought the parts need and mount the PCB as need.
In the net, people tell about it be the same as the part SY7208 and others tell be same as others.
In true, it looks be unique and no datasheet up in the internet for download.
It works fine if not load but lost voltage if get a load.
You can read the only one I found link below, after translate with the Google Chrome:
https://misoji-engineer.com/archives/6037806.html
If someone can try to solve the unexpected response, the no power, please, give us your contribution.
Annexed:
Schematic,
PCB,
Oscilloscope Print
PCB Pic x 3
Chip Pic x 3 (both side),
Tape Pic x 1
Condition:
2 x AA Alkaline,
1 x 1N4148 to protection,
1 x 62 ohms resistor load,
Information:
Chip print: B6287Z
Oscilloscope: OWON SDS7102V full band:
Chanel 1 Red: Tuned for -1V connected to input
Chanel 2 Yellow: Tuned for -1V Connected to output
Horizontal: 200us
Inductor: 22 uH CD43
Diode: SS310
Input caps: 3.000 uF Electrolytic + onboard 10 uF ceramic
Output caps: 2 x 10 uF
VOUT = VREF x (1+R1/R2)
Internal Vref = 0.6 V
Output without load, 5.1 V
Output power with load (62R): 47mA
Oscilloscope show 647.408 Hz in the output
Thank you in advance.
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