Power management

Hello,LED1202 Can we use over 5V for VLED?For example, We plan to use  5V power supply. It's maximum voltage is 5.25V.It is my understanding that we can use maximum VLED voltage is  VCS_MAX plus VF of used LED.Is that right?Thanks, 

Hello,I am having trouble measuring current with the L99615C STEVAL kit and wanted to check if I might be doing something wrong. My jumper settings are as follows: J19, J20, J13, and J14 are shorted, while J15, J16, J17, and J18 are set to position 1-2.I connected a 22Ω resistor between CH+ and CH-, but when I measure the current, it seems that no current is flowing through the resistor. Is there anything additional that needs to be done, or could there be a mistake in my setup?I also read that for the HS setup, some jumpers need to be removed, but I assumed this only applies when a charger is present. Since I am using power supplies instead of batteries and do not need to use the MOSFET section, I shorted it instead.I am attaching a picture of my setup and a wiring diagram for reference.

Hello,I’m encountering an issue where I’m unable to fully understand the behavior of the GUI in relation to the commands being transmitted via serial USB to the NUCLEO. I’ve figured out that there is a CRC at the end of the raw data being transmitted through USB. However, despite trying several online calculators to generate the same CRC, I haven’t been able to match the CRC present in the raw data. Is there a specific algorithm used to calculate the CRC? I am attaching two pictures that show the result of calculating the CRC and the CRC generated by the DEMO GUI. Perhaps I’m misunderstanding how the GUI operates, but I assumed the GUI was responsible for generating the CRC in this case.Thanks in advance for your help.Best regards,Dominik Limber 

Hi Everybody,In the case of a LEDs tubes dimmer, I'm using a TD352.It works very well. But in some case (and for the moment, I don't know why), my IGBT and the resistor wich controls the gate of the IGBT burn.I just replace these two components and after it works well. It happens very rarely, but it happens.IGBT can drive up to 80A (@ 25°C), and Vce is ok up to 650VAC, and the maximum inrush current that I measure is 35A, and the peak voltage, it's around 450VAC.The value of the resistor is 51R in 0805 case.The IGBT that I use is an IK40N65WR5.If you have some suggestions to try to understand what happens, I'll be very happy.   

Hi everyone, I am looking for s low-side driver that will last more than 5 years, preferably 10. For functionality, L9822E and L9823 are good candidates, and I would like to know their expected EOL. Thanks Insu

Hello!I am new to circuit design so please treat me patiently :relieved_face:I am building a receiver circuit based on STWLC98 and following the design guides from STEVAL-WLC98RX wireless power receiver evaluation board manual. My question is what tool can I use to test the circuit without assembling it? I worked with LTspice XVII before, but it does not have all the necessary components. Maybe there is a simmilar tool for STM MPU?Thank you for any useful reference!

Posted on March 27, 2017 at 18:51 I'm using STM32F303 which operates on 3.3V  how can I communicate with the L9823 SPI which runs via 5V? thank you

Hello team, I'm using this L9823 for driving a 24v, 0.24A DC motor, but sometimes when i try to turn on the Fan it is not working and after some 3rd attempt it is turning on. The output is capable of driving upto 2A right. I monitored the current and during the turn on time i get a current spike of 1.3A for 80us. Does the cureent spike making the output to turn off? I also observe the same spike during the fan working condition also , but the duration of  spike is less. Can anyone give a solution.    

Hi there,My question is if there is a way to enable or disable the Viper26K with for example an optocoupler.In the isolated flyback topology this is done cycle by cycle. But we want to enable/disable it in the high voltage buck configuration. Can we short-circuit the comp network for long periods of time? How is the internal startup circuit designed? Thanks in advance!

Hi. Looking to use E-L9823 as a replacement in a legacy design.The datasheet states pin 21 is not connected. Looking to confirm it is a true "no connect" internally on the part.  On our existing PCB it will be tied to +24V. Thanks.

If the resistance value of RLimit is set to 14Ω to 22Ω, how do you calculate the heat generation of the resistor?Is 0.1W OK for other resistors?Also, can you provide the BOM for the evaluation board (STEVAL-EFUSE01)?

I'm using the vnf1048f chipset.k value is required for current sensing, but it is not specified in the data sheet.Can you tell me what the k value is?

Hello,   I am trying to find the ESD ratings for this SCTW100N65G2AG. Usually its given in datasheet where its talking mostly about electrical stress data showing the ESD HBM and ESD  CDM, but I can't find this information in this MOSFET's data sheet.      

Hello, So I recently received the dev board STEVAL-WBC86TX and was quite impressed with the features. Accidentally the wrong config ID was written to the board. Now I cannot connect to it again using the Windows utility. The USB to I2C appears to be working normally, but there is an error in the log and the device never connects successfully in the GUI, thus, I cannot flash the original config and nvm patch files from the website, provided as STSW-WBC86FWBPP. [TX]WBC86 connection ex: Wrong config id 0xDA06 and patch id 0x0000 for TX" I thought I could edit WBC86.json.enc, which probably contains which ID and such... I'm guessing this is encrypted json. Is there a way to hard reset this chip to restore connectivity to the dev board?  

Hi  , I've a question regarding the EVB in the subject , in the Data brief the Deadtime , with the pot in the center , is about 700ns , that seems to me a lot for the GaN device used .In the previous version ( EVSTDRIVEG60015 ) it was 100ns with the same GaN , is possible to know the reason for a higher value ?ThanksIce

I am driving an A2212 13T motor with sensorless FOC with B-G431B-ESC1.The motor ran up to a certain speed.Then it stopped showing an overvoltage fault in the ST motor pilot.I am tried tuning Startup parameters.But the problem exists.Give me solution to overcome problem?

Hey all,I'm trying to locate the datasheet of the following device:I think that it is a Zener, but I am not 100% sure.I've done the usual "Google" for the text, but I can't seem to find it.Thanks in advance.

Hi,I’m seeking advice on selecting the appropriate battery monitoring IC for a project involving a 4S LiFePO4 battery pack. My key requirements are:Accurate Cell Voltage Monitoring: I need to measure individual cell voltages in a series-connected pack.Open-Wire Detection: The system should reliably detect when a cell is physically disconnected (i.e., reading 0V or open-circuit conditions).Handling Removed Cells: The IC should continue monitoring the remaining cells accurately, even if one or more cells are removed from the stack.I initially started using precision rail-to-rail op-amps configured as differential amplifiers to measure cell voltages. However, handling floating inputs when cells are removed from the stack altogether has proven to be a non-trivial design challenge. To simplify the design, I’m considering dedicated battery monitoring ICs for voltage readings and open-wire detection, with the L99BM114 as a potential candidate.That said, I’m concerned about the L99BM114’s open

Hi can someone help me with identification a marking diode ?

Hello I have created reverse polarity but it can not work stable especially in the first work , this time I change the voltage a little bit it works :) ı cant understand. What should ı do?

Hello.I would like to request MTBF data for STUSB4700QTR at the request of the client company.I would appreciate it if you could reply.

Hi,I am trying to develop a custom USB-C based sensor accessory device for phones and tablets. Overview : 1 x USB-C male plug that will directly connect to a tablet, the accessory device will get power from the tablet, and a STM32F411 will send connected sensor data via USB 2.0 lines.1 x USB-C receptacle, that will be used to charge the tablet (with PD negotiations, up to 100W) when a PD charger is connected to it. It will also send the sensor data while it is charging the tablet. For USB-C PD negotiations I need a standalone controller that doesn't require any firmware.  I did some research and learned that I must implement a DRP to do this and I learned about STUSB1602.Question: For the male USB-C plug the CC1, and  CC2 lines are CC and VCON can I connect the CC and VCON to the CC1 and CC2 lines?Do I need the dead battery feature for my application?Can up to 100W PD be achieved using only CC1 and CC2? My concept drawing is attached and I need h

Edit by ST Moderator: This post has been translated from Japanese to comply with the ST Community Terms and Conditions (§10.2).. STD10P10F6 I would like to ask a question about the following. Do you have documentation showing the location of this component in relation to the land relative to the external shape of the component?

Hello,what would happen if I have a fixed 5V output L6920D boost converter and the input voltage is 5V. Will it just pass through?Thanks

Dear Community,We are considering using the STSPIN32G4 to integrate and control the motor in our system. The primary reason for selecting it is that our battery supplies 6V-8.4V, which falls within the STSPIN32G4's 5.5V-75V range.We have a few questions regarding the EVSPIN32G4:Input Voltage LimitationWe are interested in purchasing the EVSPIN32G4 to test it out. However, we noticed that the product specifications state the input voltage range as 10V-75V, while the components appear to support down to 5.5V. We would like to understand the reasoning behind this limitation. The best case is we can directly using our battery supplies 6V-8.4V, to power the board.  Op-Amp Configuration and PA2As per our understanding, PA2 is used as OPO1 and should output the voltage difference to be sent to an ADC pin for current sensing and processing. However, PA2 does not seem to be connected to any other GPIO, leading us to wonder how this Op-Amp is functioning.Can the STSPIN32G4 di