Power management

Cross to Diodes Inc PN: SDM40E20LC-7 with long life cycle for new design.  

Hi,We are looking for recommendations on a suitable topology and charge controller for charging a LiFePO₄ battery with the following requirements:Input voltage: 9–36 VDCOutput voltage: 10–36 VDCOutput current: up to 80 AWe understand that a single IC may not support this current level, so we are considering a parallel architecture using multiple controllers. Kindly suggest an appropriate approach and suitable IC options.Thanks,BK

Hello, We are looking for suitable drivers for L9396. Got only the Datasheet & a WSS Operation document. Can you help with the SPI Driver ?   Regards, Prakash B J

We are currently evaluating the following STMicroelectronics IC for our application:SPV1040TTRAs part of our reliability and performance assessment, we kindly request your support in providing:Temperature vs. efficiency curves across the specified operating temperature rangeMTBF (Mean Time Between Failures) data or estimated MTBF hours for the above-mentioned ICs

I have a component on a board that I am trying to identify.It showsST logoBGVGP244I'm hoping someone can help with this.  I included a pic in hopes that will help.Regards,Curtis

I'm using eFuse STEF05D, found 2 version of the datasheet below which show the different formulas:STEF05_en.DM00034383,pdf: R-Limit = 65/IshortSTEF05D.pdf: R-Limit = 42/IshortCan someone help clarify which formula is correct? 

Hi all,I am using the STUSB4500 to power a device with a large inrush current. I have configured the PDO's for 20V @5A which should be more than sufficient to meet the power requirements.  I have selected POWER_ONLY_ABOVE_5V so that it will not attempt to power the device at 5V (which would draw 4 times as much current). See my settings below:  However, when I connect a 100W USB-C PD adapter to the circuit I see the chip first negotiate 5V before switching to 20V. I think that is expected but what I did not expect is the VBUS_EN_SNK to pass through the 5V. I believe this is causing the overcurrent protection to trip on the USB adapter (after a short delay) so we see the power turn off shortly after the switch to 20V. In the below scope trace the yellow is VBUS and the cyan trace is VSink (see  schematic attached).   Has anyone run into this issue?  Any idea what I might be doing wrong?Let me know if I can provide any more details. Best regar

i am using viper 22A. having three outputs. one output is regulated and other two are non regulated.I am having below problems1. i keep fan load of 120mA, output is regulated but as soon as i connect other load , all voltages dips including regulated ones.2. if i add more load on regulated winding, my voltage drops on regulated ones.3. if i increase grid voltage beyond 210v, ic enters into some kind of protection. it turns on and off. i have attached the transformer  and circuit diagram.It will be very helpful if anybody could help

Hi,What about Simetrix EOR model for the RHFL4913A?? It would be really fine as well to get RHFL7913 BOL and EOR simetrix models.Cheers.

HiIn this EVAL-SCS001V1 BoardI want to connect this board to my STM32F767ZI, BUT Data lines D+/D- on Its USB-C Connector are not connected to any test point. Is there any workaround this? I can solder wires to for example A side of this connector(D+/D-) but then B side will be left unconnected. I can live with the fact that USB CABLE will work in only 1 orientation when inserted in USB-C Receptable but i am unsure of any other consequences that it will cause? Power delivery contracts/CC1/2, etc.. I know ST offers another Development board STEVAL-ISC005V1 where these signals are available but don't need so many Voltage Outputs and EVAL-SCS001V1 fits perfectly.

We are considering using ST TRISIL (TSS)  devices for crowbar protection . We have been using an alternative type of protection device from LITTELFUSE (SIDACTOR) in an application where we require the TSS to fail as a short circuit. In our application we require the TSS to be a single use device that fails to a very low impedance in a current limited circuit (~3A) . The LITTELFUSE devices have been tested extensively in our circuit and do fail safe to a very low impedance of ~0.1 ohms however some other brands (not ST) have a percentage that fail with impedance of say 5-7 ohms which is too high a resistance  with 3A flowing and this creates excessive power and fire risk. The ST data for the SMP100LC series of TSS device says that it will fail safe and our testing on 10pcs so far shows this to be correct. Can anyone confirm that the design of the TRISIL device will never fail in a higher impedance manner therefore minimizing fire risk?

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?   Last question,  There is a section labeled "(programming)" under the OTP reg. Could you please clarify what this means?  

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 ?  Thanks :)

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 in case watchdog failures occur when using SPSB081 with S32K312.Thank you

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 on the damaged products and found the

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 simulation?If a direct LTspice model is unavailable, is the

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 ~500 mV after the capacitor) At 100% PWM, the filtered voltage goes near zero Questions: Shouldnt it be linear w

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