I am using the SI3402 chip to use POE.
But it does not work properly.
The circuit I have constructed is as follows.
POE: SI3402 (non-isolated)
Ethernet Transceiver: H2019NL
When POE cable is plugged in, it charges for the first time but it becomes impossible to charge soon. I think that the POE side circuit is a problem because I operate normally when only 5V is applied to the charge IC.
Since it is confirmed that 5V is output from the output terminal, it is not a voltage problem.
I attach the schematic that I composed with PDF.
Please make sure that there is something strange in my circuit.
I created a design for a simple MOSFET driver using the Si8261BCC-IS. The schematic and Gerber files are available here: https://drive.google.com/file/d/1OrVLv4VfJS-6A83AF7Kemexxz-GgUZdO/view?usp=sharing
When I connect the input control signal, the chip blows up. There is proper smoke and stuff. The supply voltage on the MOSFET side is 24V. Why would this be happening?
According to Si838x datasheet, section 3.4.1, page 7:
"To enhance the robustness of a design, the user may also include resistors (50–300 Ω) in series with the outputs if the system is excessively noisy."
My application is a PLC, so customers can use the PLC in noisiest environments.
Because high-energy pulses are filtered by device "optocoupler", my question: Is really necessary the series resistors on output side?. What is the purpose?. Avoid EMI or meet EMC?. Could you explain why?.
I'm using the parallel device, but, this is apply to serial devices with SPI also?.
I just wanted to know whether both output channel of Si8273/4/5 are isolated from each other if we provide isolated power supply to each of (VDDA-VSSA) and (VDDB-VSSA)?
For example, can we use Si8273/4/5 to drive two switches of "two-switch forward converter"?
I am using SI8900 ADC with UART communication.
Auto Baud rate process:-
Master transmit 0xAA command frequently. Si8900 have to reply 0x55 command for successful communication establish. But i have not received 0x55 value . Si8900 replies 0xAB and 0x02 frequently. i have tried with 9600 baud rate to maximum baud rate value with serial Emulator. Kindly support us for establish the successful communication. i have attached the excel sheet with the sample data's which we received for your reference.
I cannot find it in the datasheet: can the voltage driving VO by a resistor be significantly higher than VDD, provided that they are both within the 30V limit? In other words, how open collector is this open collector output depicted on the schematic?
Best regards, Piotr
I have a question about the opto-Coupler SI8710CC，in the datasheet I can't find the parament “CTR”, I want to know the reason.
In addition I have a project of switching power supply, I want to use this opto-Coupler and TL431 as the feedback sectioln, if SI8710CC is not the solution, pls recommend a proper opto-Coupler, thanks.