Power management

Hi team,Can you please help me with the Single Event Effect (SEE) analysis, Type of technology used, Technology Feature Size details for LDCL015MR? 

Dear ST Technical Support,I would like to inquire about the short-circuit protection behavior of the VN7003ALH high-side switch.Application: Board with 6× VN7003ALH outputs.Configuration: 24V supply from 200Ah lead-acid battery. Output wiring: 1.5m of 12 AWG.Issue: With output ON, a hard short circuit was applied via 600A mechanical contactor. The VN7003ALH did not survive — the package cracked (photo attached).Question: Is this behavior expected? We assumed the integrated short-circuit protection would handle such transients. Are there specific source impedance or di/dt limitations we should be aware of that are not covered in the datasheet? Best regards,Artem

  Hi,  I am currently reviewing the use of the STPM066S. According to the documentation, it seems that one-time programming is required before voltage output is enabled. As I understand it, once the OTP region is written, the change is irreversible. I have ordered the STPM066S evaluation board and some spare ICs. My First question is: after programming and testing the initial settings, if I want to change the settings and test again, do I need to replace the IC with a new one each time? Or is there any way to reprogram or modify the OTP settings after the initial programming?   Second question, There is a RSV TM bit in SPI MOSI data frame( DI[22] : Test Mode Flag). What is it? What can i test with this bit? Can i test OTP area with this bit?

Hello, I'm currently designing a BDC-motor controller with the STSPIN840 and was wondering how low I can go with the current sensing resistors to minimize the losses across those resistors. Especially at higher currents in parallel mode the resistor losses would become quite large when staying in the region the eval-board is dimensioned. Is there a minimum sense voltage that I should stay above or is it going to be stable no matter how low I push it (assuming the reference voltage is reasonably stable)?Can I use like 50mOhms there? That would result in a reference voltage of 0.15V when using the 3A limit, so I could probably get away with a single 0.5W sense-resistor.

I purchased the EVALSTGAP2HS board for evaluating STGAP2HS gate drives. I'm disappointed in the available documentation for this board, but finally I deduced that the only correct way toconnect devices is as shown in the figure I'm a bit puzzled by the location for the designators, and what appears to represent the courtyard for the MOSFETs... For quick and dirty evaluation, is this how you would place the leads ?

Hello, We are currently integrating the SPSB081 PMIC for voltage and wake-up management in a Body Control Module (BCM). The PMIC is interfaced with an NXP S32K312 MCU via SPI.System Setup:MCU: NXP S32K312 (100-pin package)PMIC: SPSB081Communication: SPISPI Configuration: CPOL = 0, CPHA = 0, 32-bit framesSPI communication has been verified and basic register read/write operations are working correctly.Issue: Watchdog Runtime ConfigurationWe are trying to perform runtime watchdog configuration and set the watchdog window to 160ms. However, we would like to confirm the correct SPI command sequence required for modifying the watchdog configuration during runtime.Request:Confirmation of the correct SPI register write sequence required for runtime watchdog reconfiguration.Any recommended configuration example for setting a 160ms watchdog window.Debug guidance

We are currently using the PM8805 in our PD (Powered Device) design.We have recently encountered field failures and suspect that the root cause lies in the customer's testing process.Our customer was using a Passive DC Injector (55V DC Supply) instead of a standard IEEE 802.3at/bt compliant PSE. During their inspection, they perform "Hot-plugging" of the 55V DC source directly into the RJ45 port.I’m assuming the PM8805 has to 'work through' the Active Bridge’s body diodes during the initial handshake (Detection/Class). Since the MOSFETs aren't active yet, all that signaling current must be passing through the parasitic diodes, correct?My concern is that when using a 55V direct injector, a massive amount of inrush current is forced through these body diodes before the voltage even reaches the UVLO threshold. Doesn't this put a lethal amount of stress on the bridge before the PM8805 can even start its control sequence?We performed a failure analysis

Hi,We wish to do a Boost PFC with L4986A and a  30uH inductor.Power is 2200W and Mains is 85-265VAC.When the mains is at 240VAC,  the inductor current would be discontinuous for some 80% of the mains half cycle.Is this OK?Will the L4986A be able to control it  to give a good power Factor with low THD?

I am designing a 3-phase AC to 24 V DC power supply and plan to use the VIPER26K high-voltage converter (as used in the STEVAL-VP26K02F evaluation board) as the main switch-mode controller in a flyback/isolated design. The target specifications are:Input: 3-phase AC, ~90–480 V ACOutput: 24 V DC, ~200 mAI have reviewed the STEVAL-VP26K02F datasheet and schematic. While I believe this device family is suitable for my application, I am unable to simulate the design in LTspice due to the following issues:The available OrCAD/PSPICE models from ST are not directly usable in LTspice.I cannot successfully import or convert the existing model due to signing/encryption and compatibility issues.The product page only lists PSPICE and SIMPLIS models, and I haven't found an LTspice-ready model for the VIPER26K.My questions are:Does ST offer a native LTspice (or compatible SPICE) model for the VIPER26K (e.g., VIPER267KDTR) that I can use for sim

Hello,I am a graduate student working on power electronics research.I am using STDRIVEG600 in my experiments and simulations.I would like to ask if any simulation model is available for STDRIVEG600.If available, please advise how I can obtain it.Thank you for your support.Best regardslanrain

Both the BoM and Schematic (in the Data Brief) do not show the part numbers or values for L2 and L4 on the STEVAL-STPM801 ORing circuit.  Which inductors are used on the reference design?   Thank you. 

We are students that are trying to make a multi frequency power system interconnection model with a dc link similar to real life back to back hvdc, and we need a converter that supports bidirectional power transfer, is it possible for STEVAL-IPM15B to act as an inverter, then switch to rectifier in case of need for reverse power flow? Making it bidirectional AC<->DC, transferring from AC to DC and vice versa

Hello everyone, I’m having an issue reading the current sense (CS) output from a VND7040 using an STM32G473 ADC. When driving a DC motor with PWM: • At ~50% duty cycle, I measure around 500 mV on the CS signal (after RC filter) using an oscilloscope• At 100% duty cycle, the voltage drops to around 0 mV I’ve locked the internal multiplexer so the CS output corresponds only to the channel driving the motor.Also sen is always on at 3.3v. Vcc is stable at around 13V.Also have the gnd filter with diode and resistor recommended on the application document. The CS pin is connected through an RC filter to the ADC input (schematic attached). However, the voltage behavior seems inconsistent — especially at 100% PWM where I’d expect a higher or steady value since current is continuous. Observations: On the oscilloscope, the CS signal looks like pulses at 50% PWM (which average to

Hi ST,It has been more than a year since STEF48H28 was announced (document DB5404 dated Nov 2024).When is it going to be available for preview?I would prefer to use ST’s solution over a comparable device already available as evaluation module from a competitor; however, it is difficult to justify waiting without any announced preview or release timeline.Thanks,Thomas

I am currently working on a row-scanning LED matrix application using STP16DP05 and a NXP imxrt1064 MCU. I’m encountering some synchronization issues and would appreciate some clarity on the following: 1. OE (Output Enable) and Data Transfer Correlation: Is there a strict correlation between Data Transfer (Clock/SDA) and the OE pin? Specifically, can I keep OE enabled (pulled Low) while shifting in new data and pulsing the Latch (LE) pin? I am trying to determine if OE must be disabled (High) during the entire transfer-to-latch sequence because if i keep OE grounded all the time, I'm seeing unexpected behavior on LED display. 2. Brightness Control Alternatives to PWM: Are there recommended methods for implementing brightness control other than standard PWM? I am looking for techniques that will be implementable with SPI as that is the protocol im using for data transfer. 3. PWM/Bit-Shifting Issue in Row Scanning:

I am using a L6470 and everything is working fine with one exception. When I do the initialization of the step mode and configuration registers, if the SW input is low, then the initialization does not work. If the SW input is high, then everything works fine. The signal levels on the SW input are compliant with the Vdd levels (3.3V). Looking for any insight. Tom

Hi,   I am using a STEVAL-WBC86TX Wireless Qi transmitter. I am going through a code and couldn't figure it out what is the meaning of the code(proprietary packet) received by the transmitter. Can any one help me to understand the meaning of this code.  

Good morning everyone! I have a fast question related with STPMIC1. I want to use it in a design with a STM32MP135 but I don't clearly see how to do it, specially the DDR rail, because I understand that i have to program it. But, in a 20-30 units production, How can I flash it? Is there a special tool to flash it by i2c? Or i should to make other solution in PCB?Thank you so much!PD: I need STPMIC1D (used in DK EVAL Board)

Dear ST Community, Since the STUSB4710 is now NRND and no longer readily available, could you please advise what its recommended replacement is?I am specifically looking for a USB-C Power Delivery source controller that requires no firmware or only minimal firmware.Thank you in advance.

I am developing a solution using a STWBC2-HP tx running from a 24VDC supply to drive a STWLC99 rx and need to use the STSC protocol to achieve 50~100W. This is for bespoke power transfer rather than a conventional charger. I am basing the design on the steval-wbc2tx50 datasheet with ratings upgraded for the extra power. Also referring to '100w-wireless-charging-solution-based-on-stwbc2-hp-and-stwlc99-rayna-wang.pdf' from ST's website.Does the STSC protocol require Qi1.3 (ie does it need STSAFE-A110) and how do I enable this?Do I just need to configure the current and voltage parameters via the UART for this power level?Thanks.

Hi, I'm trying to spec a fully integrated H-bridge for driving a small motor taking up to 6A nominal, with spikes up to 12A (looking at the VNHD7012AY, VNHD7070AY, and the VNH7100BAS). There are a lot of numbers for current limitation on the ST datasheets that I've come across and I haven't been able to find an explanation for. How should I interpret all of these, and how are each of these numbers obtained?Specifically, I'm looking at:- Continuous maximum output current I_max- High-side current limitation I_lim_h- Shutdown low-side current I_sd_ls- Output saturation current I_out_sat (under Current Sense)

Hi, I'm designing a driver using 3x STSPIN9P12 to drive a Permanent Magnet Synchronous motor (PMSM).  I have a ADC connected to the SNSO outputs to measure current and I am controlling the current in the MCU's control loop.  I am not using the COUT and VREF pins.Can / should VREF be tied to GND?I think the TOFF pin does not exist on this version.  Do I leave TOFF floating?  or should TOFF be tied to GND?Jon

Hi,We are designing a compact, battery-powered system that requires a regulated high-voltage DC output with the following specifications:• Input: 5V• Output: Adjustable 400V to 1000V• Load current: 1µA to 200µA• Very low ripple and noise• High efficiency and small form factorThe supply will be used as a bias source for sensitive detectors (e.g., APD/PMT-type devices), so output stability and low noise are critical. The output must remain stable across the specified load range.I am currently considering a closed-loop flyback topology with post-filtering, but I am open to alternative architectures.Could you please recommend:• Suitable controller ICs from your portfolio?• Relevant reference designs or evaluation boards?• Design techniques for minimizing ripple and noise at these voltage levels?Any guidance or application notes would be greatly appreciated.Thank you. &nbs

Hello everyone,We are currently working on structural validation and material testing workflows.Has anyone here implemented automated reliability testing setups?We documented some testing methods and validation ideas here:Would love to hear your feedback.

Hi . I'm using STGAP2D SO-14 IC in custom project with custom board , and in datasheet i see pin8 specified as N.C. (not connected). Pin8 must be left floating for ic to function properly , or can it be connected to nearby pin7 (GND) ?  Is this pin internally not connected at all (dummy pin) ,or it's connected internally to something ? i'm using single layer pcb currently with pin8 not connected and ic functions properly,but i would like a clear answer about possibility /prohibition of this pin connection - datasheet doesn't explains that . Thanks in advance .