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.
Hi ,
1. I would like to know if Si8751 is suitable to drive large FET (IRFP7718) with gate charge of 552nC and CiSS = 29550 pF . ( as in the data sheet the gate capacitance is assumed to be 100pF_).
2. The switching frequency of the load is slow at 1Hz. The load is a 20,000uF capacitor . The Supply voltage is a 48v battery. will this cause stress on the FET ? as it will see the load as short circuit and stay in linear region for app 10ms ( my calculations for TT connected to GND)
3. I will use a 100pF capacitor from MCAP1 to FET Drain for miller clamp . Any comment on making circuit more robust and reliable ?
Hi,
i am using an SI8920 to observe a current over a shunt (what else..). The result is differentially amplified and is fed in a differential ADC. Now the ADC readings give some head ache since i am seeing some tones generated from the SI8920.
I have attached 2 images: one shows the base-line spectral noise of my system (via FFT on a 933kSPS signal stream) and one with the SI8920BC with shorted inputs.
Those tones are device-specific (85kHz in this example). That means, every SI8920 on my PCB (i am using 4 in parallel on 4 ADC-Channels) has a different noise-frequency peak and when desoldered and swapped around the specific tones follow the chip.
Those tones vary widely within the spectrum. I have a PCB where, by mere luck, all tones are so high, they are swallowed by the aliasing filter. Then i have a PCB where all are right in my spectrum of interest.
If anyone knows where this tone comes from and how to influence the frequency of this disturbance, i am all ears.
I have a question regarding the SI8271BB-IS gate drive (single gate drive with VO+ and VO- outputs). Our chip regularly burns down without any apparent reason. However, I connected both outputs (VO+ and VO-) directly together since I'm only using a common resistor for turn-on and turn-off. Could it be that there is a short overlap interval during the switching transient where both outputs are still driving their pin, thereby leading to a short circuit? Unfortunately the datasheet doesn't provide a lot of information about the output stage of the driver.
We need to confirm that this Silicon labs kit can drive this IGBT module opitmally
1 - The Si8275iso is rated at 4A output. what is the power supply requirement for this board to provide this current? can a 1 to 5 watt power supply, provide enough powwer for this driver board? would you please point me to the specifications of the required power supply for this board?
2 - can this board provide the required Gare charge for this IGBT module to operate?
Hi guys, I'm new in this forum and with Silicon Labs products. It is good to explore this company.
I'm interested in using the SI8661AB-B-IS1, and basically what I need is to convert logic levels from 0, 3.3V to -2.5V, 2.5V. graphically explained I need to do the connection I show in the figure below. Is it fine? can I use this IC in this way?
Hi guys, I'm new in this forum and with Silicon Labs products. It is good to explore this company.
I'm interested in using the SI8661AB-B-IS1, and basically what I need is to convert logic levels from 0, 3.3V to -2.5V, 2.5V. graphically explained I need to do the connection I show in the figure below. Is it fine? can I use this IC in this way?
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?
Forum
Question about si3402
Hello,
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: W5500
Ethernet Transceiver: H2019NL
Charging: BQ25601
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.
Thank you.
AT Command sequence For Voice Communication using Si2494-A-FM18-EVB
We were Evaluating Si2494-A-FM18-EVB for Voice communication. We have connected Handset(Speaker and Mic) and PSTN line.
Can you please tell us the sequence of AT commands to configure in Si2494 Using Ultracom software for Voice communication?
Thank you so much in advance.
Driving complementary mosfets
For a system we are designing, where we have to use a complementary mosfet pair, are there any silab isolated drivers that will work ?
Thanks
Steve
Using Si8751 for High power DC SSR
1. I would like to know if Si8751 is suitable to drive large FET (IRFP7718) with gate charge of 552nC and CiSS = 29550 pF . ( as in the data sheet the gate capacitance is assumed to be 100pF_).
2. The switching frequency of the load is slow at 1Hz. The load is a 20,000uF capacitor . The Supply voltage is a 48v battery. will this cause stress on the FET ? as it will see the load as short circuit and stay in linear region for app 10ms ( my calculations for TT connected to GND)
3. I will use a 100pF capacitor from MCAP1 to FET Drain for miller clamp . Any comment on making circuit more robust and reliable ?
SI8920BC noise tones
Hi,
i am using an SI8920 to observe a current over a shunt (what else..). The result is differentially amplified and is fed in a differential ADC. Now the ADC readings give some head ache since i am seeing some tones generated from the SI8920.
I have attached 2 images: one shows the base-line spectral noise of my system (via FFT on a 933kSPS signal stream) and one with the SI8920BC with shorted inputs.
Those tones are device-specific (85kHz in this example). That means, every SI8920 on my PCB (i am using 4 in parallel on 4 ADC-Channels) has a different noise-frequency peak and when desoldered and swapped around the specific tones follow the chip.
Those tones vary widely within the spectrum. I have a PCB where, by mere luck, all tones are so high, they are swallowed by the aliasing filter. Then i have a PCB where all are right in my spectrum of interest.
If anyone knows where this tone comes from and how to influence the frequency of this disturbance, i am all ears.
Lead finish/Plating
Reliability Si88342EC-IS and Si8621BT-IS
Hi,
where can i find the MTBF/Fit rates for Si88342EC-IS and Si8621BT-IS?
Kind Regards Rolf
Connect VO+ and VO- of SI8271 gate driver
I have a question regarding the SI8271BB-IS gate drive (single gate drive with VO+ and VO- outputs). Our chip regularly burns down without any apparent reason. However, I connected both outputs (VO+ and VO-) directly together since I'm only using a common resistor for turn-on and turn-off. Could it be that there is a short overlap interval during the switching transient where both outputs are still driving their pin, thereby leading to a short circuit? Unfortunately the datasheet doesn't provide a lot of information about the output stage of the driver.
SI8275ISO-KIT to drive IGBT modules
Hi,
We are considering using the SI8775ISO-KIT to drive MG12400D IGBT module from littlefuse
here is a link to the IGBT module: https://www.digikey.com/product-detail/en/littelfuse-inc/MG12400D-BN2MM/F6484-ND/5034239
We need to confirm that this Silicon labs kit can drive this IGBT module opitmally
1 - The Si8275iso is rated at 4A output. what is the power supply requirement for this board to provide this current? can a 1 to 5 watt power supply, provide enough powwer for this driver board? would you please point me to the specifications of the required power supply for this board?
2 - can this board provide the required Gare charge for this IGBT module to operate?
SI3404 burned
Hi,
We are using the SI3404 chip to use POE, When we used the standard PoE injectors, it works perfectly.
But when we used the non-standard PoE injectors, the chip would burn out occasionally.
Our design is a reference of Si3404-Buck EVB board. Is the SI3404 not support the non-standard PoE injectors ?
Thank you for your Help.
using SI8661AB-B-IS1 to translate from 3.3V to 2.5V and -2.5V
Hi guys, I'm new in this forum and with Silicon Labs products. It is good to explore this company.
I'm interested in using the SI8661AB-B-IS1, and basically what I need is to convert logic levels from 0, 3.3V to -2.5V, 2.5V. graphically explained I need to do the connection I show in the figure below. Is it fine? can I use this IC in this way?
Thank you
using SI8661AB-B-IS1 to translate from 3.3V to 2.5V and -2.5V
Hi guys, I'm new in this forum and with Silicon Labs products. It is good to explore this company.
I'm interested in using the SI8661AB-B-IS1, and basically what I need is to convert logic levels from 0, 3.3V to -2.5V, 2.5V. graphically explained I need to do the connection I show in the figure below. Is it fine? can I use this IC in this way?
Thank you
Why would this design (Si8261BCC-IS) blow the chip?
Hi,
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?
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