Power management

Here is my hardware design. The output with load goes high during chip reset. When I cancel the reset, the output immediately goes low before I have done any control. I turn the output on or off again with no effect and at this point the diagnostic data is 0xff. Is there something wrong with my hardware design?  

Hello.I have a problem with this IC. I can read cell voltages perfectly. but when I initiate cell balancing on selected cells, its not happening. for that I follow these steps:1- I enable cells by writing on 0X1C Register.2- I set UV threshold by writing on 0XB register.3- activate manual cell balancing by writing on 0X4.4- then Select cells that need to be balanced by writing on 0X10 & 0X11 registers.5- and last initiate balancing by writing on 0x3.but the balancing process will not start. I appreciate any help. 

Does the charger IC ever operate outside of the specified TX FREQ MAX and TX FREQ MIN limits?For example, if the limits are set to 100kHz and 148kHz and the charger is operating at either limit, would FSK cause it to change the frequency below this value? If so, how much would the frequency be exceeded?

HiI am working on an application with wide VIN from 6V-60V and the target VOUT is 15V 3A max.When VIN > 16V, L7987 should fit my application. Problem is that when VIN drops below 16V, eDesignSuite reports an error so simulation is not possible. It states on L7987's datasheet that in case the input voltage falls close or below the programmed output voltage, L7987 is able to work in LDO mode. Am I correct? See screen capture of the datasheet below.When L7987 works in LDO mode, does it mean the chip is able maintain Fsw with duty cycle lift to 100%?What is the max. current in LDO mode?Look forward to any comment.John

Hello ST community,We are working on a 15kW Rectifier module for EV charging application. This module contains 15kW Vienna rectifier and 12kW DC DC converter, input voltage: 3 phase 415V, output voltage: 40V-120V. For this requirement, we are exploring project files (Altium files) and application notes around this power range. If you could please provide these documents, we greatly appreciate your support.Regards,Akash.

I can't find the reference of the diode on the photo. 

Hello ST Team, Greeting from Uniglobus, is the child R&D Electronics company of Polycab India limited My self Grishma Bhatt, I am Power Electronics Design Engineer We would like to start a new product 3.3KVA Single phase non isolated solar on grid Inverter I am looking for a solution from ST. Whether will get Evaluation Board? Will get Hardware and firmware support?   I am sharing technical specification for a detail

Hi,I am building a 3L Buck Converter with MPPT tracking, using the STM32G474CBT6.The STEVAL-10MLPVCB has a very similar concept to what I want to achieve, I based my MCU choice and other details on it.Is it possible to obtain the source code / CubeIDE files for the STEVAL-10MLPVCB? Thank you,Janik 

I have following three concerns related to SPI interface timing of L9825 low side driver IC. Please refer the image below. 1. Do we really need to toggle the clock signal within 100ns after NCS changed from High to low. If this 100ns is exceeded what would be response of driver IC in the SPI command recognition? 2. Why thcld is specified as Max 20ns instead of Min 20ns? Because it is always depends on the operating SCK period. 3.thclch is specified as Min 150ns. So, do we really need to bring SCK to logic high after NCS changed to logic high? If not what would be the behaviour of low side driver SPI interface recognition?  

I get an error message when I try to connect with the STEVAL-WLC38RX evaluation board using STSW-WPSTUDIO.  I am using v2.7.2 of WP Studio.  See error message attached.

Hello, I want to buy STEVAL-WLC38RX product..I can't sell it online.. may I know where I can buy it?

I want to use the PM8805 as POE controller in a custom project for a 25W classified POE device. The PM8805 should generate the input power for 2 boards in this device.However, when connecting only one board with approx. 30uF input capacitance, the power supply works without any problem. But when connecting the 2nd board with approx. 20uF additional capacitance, the power supply fails and the PM8805 is in a state, where it tries to switch on repeatedly and gets certainly hot. The POE LED on my switch is constantly lit in this situation.My understanding of this behaviour is that it is caused by the overall inrush current out of the PM8805 into the 2 boards!?To be able to develop an inrush current limiter without using the "real" boards, i bought a STEVAL-POE001V1 which i got on my table now.Connecting the STEVAL-POE001V1 to my little POE-switch (TL-SG105PE) without any load makes the power-LED (D2 - blue) blinking with approx. 1s interval and so the PO

Hello ST Community,I am currently developing a product using the PM8805 chip and have purchased and tested the STEVAL-POE001V1 evaluation board. Based on the reference design provided by ST, I created my own circuit diagram and manufactured a custom PCB. I then mounted the PM8805 chip on my PCB and began testing.Unfortunately, I encountered a few issues during testing:The STEVAL-POE001V1 board stopped functioning during my tests.When I connected my custom PCB with the PM8805 chip to a PoE cable, the chip overheated almost immediately.On the positive side, the LED indicated the device had reached T0 mode, so the device seems to be partially functioning.I suspect there may be a misunderstanding in my design or implementation of the PM8805. I am attaching my circuit diagram and would appreciate it

I'm working on developing product, for that I was going through the documents of AC/DC & DC/DC products for reference but, I'm not able to find any detailed documents. If you have any application notes or design documents regarding these products, it would be very helpful for me. If you know any contact mail IDs whom I can reach out, please provide.

Hi Sir, Does the STUSB1602 support Alternate Mode? Is an MCU required to enable it, or can it be implemented directly with the MCU alone? Is there any example code available? Thank you.  

Hi the datasheet does not contain the thermal junction temperatures for the VFQFPN48, hence hard to work out the max thermal temps for the device. please can you supplyregardsRoss

Dear All,I have created a new schematic for a project I am working on, using the POE Dual Active Bridge PM8805.I have used the reference designs from the datasheet, as well as cross referencing other POE designs online.If someone has the time, I would like a rough sanity check prior to moving into the PCB design, just in case I have missed or configured something incorrectly.Regards,Christopher 

Hi All,To start, I'm a hobbyist and although I am OK with digital, analogue and the maths surrounding design is beyond me.    I am seeking assistance in specifying the values and component suggestions for the CM Filter as noted in figure 7, page 19 of the PM8805 data sheet. If someone has a ready made solution for the following, it would be very much appreciated.   My circuit will need two power rails which I will create using two buck convertors. A 12V rail as well as a 3.3V rail. The 3.3V will only draw a constant current of around 600mA, the 12V rail will spike on occasion to 2Amps. I have designed these before and I am happy with this area.   The 12V circuit will be driving a Texas Instruments TAS5670L Class D I2S Amplifier, while the 3.3V will be driving a Microcontroller. Thanks in anticipation.  

I have been working, with STPM01 as a peripheral device with my micro controller to develop a e meter. On development with board, on testing on no voltage and no current or in case of voltage ( 220  - 240 AC ) AC and no load current. During these time the RMS value of current and voltage are non zero values, there is a offset error value of 4, or 5 in decimal. I there any solution to solve this offset. My other issue is that when there line voltage, but no current is taking but the active register is incrementing by 2 decimal. event though the BIL is high indicating there is no LOAD. Still the counter is counting, is this normal or is there any method to solve this.

Dear STMicroelectronics Technical Support Team,I am writing to request the design files and magnetics calculations for the EVAL-STCH03-45W evaluation board. I am specifically interested in adapting this design for the following input voltage 84-264Vac Our project requires detailed information on the magnetics design calculations and component selections to optimize the converter performance at these specific input voltages.Could you please provide the following information:Complete schematic and PCB design files for the EVAL-STCH03-45W boardMagnetics calculation data and methodology for the existing designAny recommendations or design considerations for adapting the magnetics for 24V, 32V, and 48V applicationsComponent selection guidelines for these voltage adaptationsIf there are already existing application notes or design variations for these voltage levels, those would be extremely helpful as well.Thank you for your assistance

Hi,We have designed PFC using L6562 referring application note AN2761 on that the auxiliary winding is used only to sense the zero current detect calc. is in Equation 65 but we also need to power the ic using the same winding.Where can i get that calculation ?now for the testing purpose we powered the ic from the external source and we are not getting pulses (square waveform) at the gate pin its gives spikes. what could be the reason?

Hi!I have a couple of questions regarding the STPM01 energy metering circuit:We are using it for measuring currents only with Rogowski coils. (We have 4 circuits on our board).We are not using the voltage measuring, so it is not connected.The microcontroller we use is a ESP32.We are only interested in the Irms values, so after reading the registers, we take out the Irms part from the register.The problem is that the values are not zero when nothing is connected or the sensor is connected but with no lead through the sensor.This is measured with a Rogowski coil with 50mV/kA:With no sensor connected the Irms part of the register reading is varying between 0x0001 and 0x0002 (the first or second bit is set (varying)).With sensor connected but no lead throug loop the register reading is varying between 0x008 and 0x00f.If we translate this to current, it will be (no sensor): 0.017 to 0.033A a

Hello,I purchased a set of Wireless charging evaluation boards (RX & TX) on Mouser.com for $160.The 2 board names are STEVAL-WBC86TX and STEVAL-WLC38RX. I use STSW-WPSTUDIO V1.8.4 software to try to connect to the board from my PC and get access to the register setting. But every time I click on the Connect button, there is the same error message appearing: "Unable to find any [RX]WLC38 device. Please check your connection again."  The issue is the same with both boards.But it seems the boards are working, because when I place STWLC38 on top of STWBC86, the boards are charging, because I can see the red LED on the receiver board, and Vout is 5V. So the main issue is the GUI.I cannot use the ST GU

Good morning, We are evaluating the use of the VNF1048. During the test phase the problem arose that despite the MOS being in the open state we detect a current flow, even if minimal, that for our application must be avoided. From our point of view this behavior is due to the current coming from the "OUT" pin. Reading the datasheet in fact, this pin provides a bypass current that could be deactivated via SPI by setting bit 3, reported below, of the CR1 register.     However, this does not reflect what happens during testing, in fact despite setting this bit to '0', the behavior of the e-fuse remains u

Dear STMicroelectronics Team, Good day. This is Louie from SnapMagic Search. We create PCB footprints, schematic symbols, and 3D models for electronic components. One of our customers is looking to integrate X-NUCLEO-IHM04A1  into their design and has requested a 3D CAD model. But, we are missing key dimensions to create the model. Could you assist us by providing the necessary data? Please see the following image for reference: