Power management

How to turn on  stm32f429-disc1 board by using an external power supply and use stlink only for programming and debugging.

Hi !I've the above eval board and wish to charge a 3.7V Li-ion 1500mah battery using PV Cells.When I connect the PV Cells to the input and check the output (bat-line), we do see 4.2V. Then when we connect the battery whose voltage is 3.98V and let it charge for over 30 hours, we notice the voltage of the battery has not increased. Please advise, Thanks in advance. 

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If the device is obsolete, it should be easy for new users to identify this.

I am trying to identify an SMD component, possibly a diode labeled:MEGP812

May I kindly ask you the Reach and Rohs documents for the following component: L7980TR? Many thanks & Best Regards

Hi,I cannot find the GUI software STSW-ILL035 which is the evaluation board for LED7708.The ST website does include a .zip file but it is only the Firmware and not the GUI software that controls it. This is NOT enough to get the evaluate using the evaluation board.Pictures of this software/GUI are in the manual for the evaluation kit:Other users have asked for it too, with no respose:https://community.st.com/t5/power-management/how-to-evaluate-led7708-with-more-than-16-channels/m-p/584432/highlight/true#M10065

Hi, I am looking for a way to send messages to a L99LDLH32 board via another program. I found the STSW-EVLDLH32GEN, but this seems to allow only to manually set select messages. What I need is to be able to determine the values programmatically and without any further human intervention, so I need an API which I can communicate with. Does anyone know where I can find such an API alongside documentation of its use? Edit: Looking further through the installed files, I found the ftd2xx.h and ftd2xx.lib files. These would provide access to the board directly, if only I had the documentation for the relevant function calls. Does anyone know, where I can find the relevant files? Best regards, Johannes Luber

I have attached two images of the L6470 Motor diver, In the new design PCB the motor drivers are heating up and don't seem to respond to SPI commands. No voltage is present on the VREG pin. The sense resistors were added basically for measuring the winding current. I have added Led on the Flag pin too. I have highlighted the changes in the Image for reference.

Hello, I have Part number STD10P6F6, I received these parts with a ST micro label on them. This label holds the trace code and at the bottom of the label it says LOT, Followed by a code. I assume that is the lot code for the parts, can you please clarify this for me? Also what is the difference between the trace code and lot?

hi sir ,we are working on EVLONE65W pd charger .we are facing issue in the circuit .output is not stable at secondary outside.can we know what we are doing wrong in the circuit ?

Can i know the minimum Operating temperature range of this IC "STW4N150"  

Hello,I am trying to set up an STPM066S PMIC via OTP (One Time Programming), but without success so far.I am struggling a bit with the description in section 6.7 of the STPM066S data sheet (Rev. 2).a) Is a more detailed application note on OTP available?b) Is a reference implementation of the SPI communication for OTP programming available? A protocol of a successful SPI communication would suffice as well, I think. If not, can someone tell me, what response from the PMIC I should expect?Currently, I do the following steps:1) apply +20V to the VBAT1 pin2) write to SAF_REG_OP: Set SAF_ADDR = "8"; SAF_CMD = "11" (simulation); SAF_AUTO_DOWNLOAD_FORCE = "1"3) write OTP Row 8 to SAF_REG_DI4) write SAF_REG_OP as above, with SAF_ADDR = "9"5) write OTP Row 9 to SAF_REG_DI6) write SAF_REG_OP as above, with SAF_ADDR = "11"7) write OTP Row 11 to SAF_REG_DI8)write SAF_REG_OP as above, with SAF_ADDR = "12"9) write OTP Row 12 to SAF_REG_DI Is this the correct way to do this? I am uncertain

Hello,I have to design a power supply for our new product. I would like to implement this with a flyback converter. The biggest las on our board is the IMX.8, this changes its power profile depending on the requirements.Key points of my design:- 230VAC input- Input buffering of 400ms, due to external requirements- PowerWatch function. This function should allow an interrupt to be triggered on the µC when the input voltage drops below 85%.- 5 V output voltage- 4 A output current- dynamic adaptation to load jumpsIs there any proven IC that can be implemented well regarding later CE certification, as this is my first design regarding AC/DC application.

Hello! I have two components (in SMB package probably). The markings are:1) ME G3 202 (no polarity stripe on package)2) EE G3 223 (with polarity stripe)Can you help me decipher what these elements may be and what may be the difference between ME and EE and the fact that one has polarity stripe and the other does not? RegardsC. Jones

Is there any IC available to convert 4~20 mA current signals to 1 to 5V DC Voltage signals in the SOIC package? 

Do we have a clear Pin Numbering configuration for this component as pin numbering which is 1,2,3 the datasheet did not clarify clearly.

Hello Dear Community, I'm trying to learn how to use the X-Nucleo-LPM01A for a Bluetooth application. I am using Nucleo-WB15CC and watching your low power measurement application videos for this card. And I followed all the steps correctly, but I couldn't see anything different in the "STM32CubeMonitor-Power" application. When I measured the CN14 connector after connecting it to the Nucleo-WB15CC, I saw that the voltage dropped from 3.3Volt to 0.5Volt. How can I understand the problem? I attached the video link and measurement results on below. Have a good day and work. Video link: https://www.youtube.com/watch?v=7IVs-nuoXj8 Sincerely, Furkan

In the application note for one of ST parts (L4981BD) and it is mentioned that the output voltage can be calculated from the following formula:   But in the datasheet, in Figure 9B, the given output voltage does not match with this formula: Does anyone know if the feedback resistor from pin 13 to 14 affect the output voltage or not?  

Need of DCDC- Bidirectional which will be used in 400V/800V EV system, Kindly share any reference design which we can have for headstart on this design.1. V Max = 420V-800V -Vin to 12V Vout (Vice versa)2. I Max = 300Amps3. P Max = 3.6 KW

I am designing a clamping circuit for an IGBT driver such as ABB 5SNA 0600G650100.Between the collector and the IGBT gate there will be a set of TVS diodes with a Schottky diode at the end. The gate will have a 6.8k pull-down resistor to the emitter and a protection Schottky diode connected to the +15V (positive power supply to the driver). The negative power supply of the controller is -10V. The second loop of the clamping circuit will be connected to the driver to control output stage. When a clamping event is detected, the controller output will switch from the off state to the on state.I'm not going to use a resistor in the clamping circuit. My guess is that when clamping, excess power will be delivered and dissipated in the power circuit. Due to the second loop, during these events the controller will be already in on-state.If we assume Rthja = 68°C/W, operating temperature = 65°C and maximum operating temperature = 175°C, then the maximum allowable power per diode is (175-65)/68

I am designing clamping circuit for IGBT driver. The max voltage is 4800V. I was thinking about using STTH112A diode. In the datasheet, there is no information about thermal resistance - junction to ambient for SMB or SMBflat version. How can I assess the number of diodes I need to use and what is the maximal Vrrm of the diode which can be used in these circuit? Is STTH112A suitable for these design? 

Hi, Please suggest any reference design or circuit for 300W PFC with input 3 Phase, 3 wire, 220VAC (L-L), 50Hz 

Dear Support,Kindly advise differences between part numbers SM6T30CAY & SM6T30CAY/2?What is suffix "/2" meaning? Thanks

Hello, What is the maximum input PWM frequency of the gate driver, STDRIVE101, and its evaluation board, EVALSTDRIVE101? It does not say on the manuals.