Power management

Hi,We are developing a 380W/400W electronic ballast for a Mercury UV lamp (Dymax 36970), based on the circuit topology presented in ST AN2747 – 250W HID Metal Halide Electronic Ballast.Lamp specifications: P/N: 36970 (Brand: DYMAX) Rated power: 380W Lamp voltage: 135V ±15V Lamp current: 3.2A AC input: 230V We would appreciate technical guidance on the following questions: Topology: Is the AN2747 circuit suitable for scaling from 250W to 380–400W for a Mercury UV lamp? Power stage: Which components and design calculations need to be revised, particularly the PFC, MOSFETs/IGBTs, buck inductor, output capacitor, and gate drivers? Control: What changes are required for ignition, warm-up current limiting, and constant-power regulation? Regards.

Hello ST team and community,ST Online Support recommended asking here after reviewing the product documentation. I am developing a battery-management hardware-in-the-loop (HIL) prototype and would appreciate authoritative protocol details and guidance on the remaining chip behaviors.Project contextAn Arty Z7-20 FPGA models ten independent 16S battery modules and ten logical L9965A CMUs, split across two VIF endpoints with five CMUs each. An STM32H753 is the external controller, communicating through real L9965T transceivers and a planned external isolated receive/drive front end. The FPGA is not connected directly to the analog ISO pins and does not replace the L9965T. Physical interoperability testing is still pending while hardware is being assembled.Implemented and tested in simulation: NORMAL-mode 40-bit single reads/writes, global/selective broadcasts, enumeration, standard cell-voltage bursts and CRC6 checked against ST's firmware calculator. The CMUs also implement coherent conv

I received VND5160JTR-65-E instead of VND5160JTR-E. Which are the differences between them? What do the additional characters ‘-65’ mean?  

 1. Executive SummaryDuring evaluation of the vienna_stm32g474 reference project, a data-rate decoupling effect was identified in the main PFC voltage control loop. The physical DC-link voltage feedback structure (VOLTAGE_ADC_DC_IN_PHY) is calculated inside a 2 kHz telemetry task (TIM7), but it is consumed by the main cascaded controller (DPC_LCT_PFC_Ctrl) operating within the 20 kHz interrupt loop (TIM2).Although the raw ADC data is sampled at 20 kHz (TIM2) and is immediately available in the Data Layer via DPC_CDT_DcVoltageRead(), the conversion to physical units is delayed by the low-frequency task. This feedback latency was previously masked by a 16-bit register truncation error in TIM7, which forced its real execution frequency up to ~8.7 kHz. Testing confirms that relocating the physical voltage scale conversion (DPC_ADC_VoltageDCAdc2PhyProcessData) to the 8 kHz voltage loop task (TIM6) resolves this constraint, optimizing PI controller responsiveness and improving grid current w

Hello,We are currently implementing the STMicroelectronics PWD5T60 power stage in our SMT production and would like to ask for stencil design recommendations for this package (VFQFPN 12x12 with multiple exposed power pads). [st.com]We are currently experiencing significant solder voiding on the large exposed pads after reflow soldering.Our current process uses:Solder paste: KOKI S3X58-M650 Standard convection reflow processWe are planning to evaluate KOKI HF1200 as an alternative paste, but before starting trials we would be interested in ST's recommendations and experience with this package.Could you please advise:Recommended stencil thickness Aperture design for the exposed power pads Target paste coverage (%) Any specific PCB land pattern recommendations Typical voiding performance observed during qualification Available assembly guidelines or application notes for PWD5T60Has anyone worked with this device and successfully optimized the stencil design to reduce voiding?Any recommend

Good day Sir & Madam, Could you please confirm if MPN STW11NK100Z is free of Dechlorane Plus?We currently have stock with date code 2410 (Year 2024, Week 10). Can you please verify if this specific batch contains Dechlorane Plus?

 I have a problem with the Viper265K. I copied the basic circuit from the eval board (STEVAL-VP26K01B).The desired input voltage range is 90-465VAC 50/60HzOutput voltage 12VOutput current ~0.1ACurrently, I have a resistive load connected to verify the power supply. Unfortunately, the output voltage collapses at higher input voltages >420VAC or it just switches on/off very briefly.The coil L201 is a 7447714102 with I: 0.43A / Isat: 0.55AWhen I replace L201 with the inductor from the eval board, the maximum input voltage is still not higher.But the eval board works perfectly with 12V and the maximum input voltage as declared by ST.What am I doing wrong? Bottom Layout 

Hello guys  I am working on a switch mode power supply with PFC  and for the latter I have picked L4984D IC.  The reference circuit design I obtained with the help of eDesignSuite online tool.   Upon assembly of the circuit, as a safety measure , I powered it through a series bulb and straight away, things did not look promising. there were no shorts, but the voltage at the INV pin measured at 0.7v , which according to the datasheet ,told me that there was a feedback failure. After inspecting all the feedback resistors and double checking the circuit, I discovered that VCC voltage was dropping below VCCON. rectified it and then Series Bulb light up brighter than before and had a pulsating visuals( not completely dimming). did more checking and found out that the main bulk voltage was dropping to 110V , which is far too low and now the only suspect seemed to be the series bulb. before bypassing it, I did one final measurements to make sure it was safe to directly turn the circuit and th

Hi I am using STUSB4500 using a usb c connector. The usb c connector is connected to XP power ac dc 65w adapter  capable of delivering 20V, upto 3.25A. STUSB4500 is never programmed over I2C and should have its default PDOs. By default settings I mean when it is connected to the XP charger, it should request by default 20V,1A from this source. Since its Req_src_current but is also 0 by default, so it should only demand 20W(20V,1A) from source even though source can deliver upto 3.25A. But I desoldered a 0 ohm resistor in the usb vbus path  after STUSB4500 and installed ammeter there and found out that 2A is flowing through vbus instead of 1A. Is this normal?As I see 20V is being delivered to load but the current is double than what’s requested. One thing worth mentioning is that load connected on the downstream path after STUSB4500 is capable of receiving upto 2.8A.but I don’t think load should have anything to say here and the STUSB4500 should request only its default 20V, 1A from PGW

I am evaluating the LDQ40PUR (adjustable version) and there is some ambiguity in the datasheet for setting the output voltage.The datasheet states:The resistor divider should be selected as follows: VOUT = (1+R1/R2)*VADJ, considering IADJ negligible. What is VADJ? Should this be VREF (1.2V)? I assumed VADJ = VREF = 1.2V, and calculated my output with the following values:R1 = 340kOhmR2 = 102kOhmVOUT = (1+340k/102k)*1.2V = 5V However, when I built the circuit with these values, I am not getting this value at the VOUT pin. When VIN is 3.6V or higher, I get VOUT = VIN (e.g. VIN=7V, VOUT=7V) Here is the schematic for my circuit:Schematic for LDQ40PUR test circuit 

Can the VNL5050N3-E operate reliably with a 3.3V Input logic signal while switching a load of maximum 2A?

Hello, community,I try to  develop power supply  based on VIPER35L, but  it  runs only in burst mode never reaching steady regulation. I have made almost a copy  of  STEVAL-ISA171V1, except of transformer, which was made by myself. According application note  AN4812.  What might be the culprit?  Are  transformer data  correct in it ?  I mean ratio  8:1:1. Isn’t  it too  small to power  self? Several oscilloscope  snapshots are taken.  Any advice appreciated. Bnx  

Hi,May I know the ASIl rating of L9663?If this device is functional safety complaint, Is there a safety manual existing that I can request for?

 Hi,I am working on an offline Flyback converter utilizing a UCC28C50 primary side PWM controller. Originally, the converter was configured for Constant Voltage (CV) mode using a standard TL431 and optocoupler circuit, which operated correctly.To convert this design into a Constant Current / Constant Voltage (CC/CV) supply, I replaced the TL431 with an STMicroelectronics SEA05 advanced controller on the secondary side. My implementation strictly follows the secondary-side configuration from STMicroelectronics' application note "10W offline LED driver based on VIPER27" (DN0002/AN4376).10W offline LED driver based on VIPER27 (DN0002)  Circuit Parameters and Component Values: Target Output Specifications: V_OUT = 15 V, I_OUT = 3 A (Test Target) Current Sense Resistor (R_SENSE / R16, R22): 18 mΩSEA05 Pin Configuration Components: R₁₈  = 3.75 kΩ, R₂₀ = 10 Ω,  R₅ = 10 kΩ, C₈ = 100 nF, C₁₀ = 1 nF, R₁₅ = 120 kΩ, R₇ = 10 kΩ,  R₆ = 51 kΩThe Problem: According to the SEA05's internal 50 mV curren

Hello, I’m using 6 of the STGAP3SXI as part of an IGBT 3 phase bridge driver. Each chip has its own 24V to isolated +15V and -9V switching supply (Meanwell GD2-241509) and the logic side is powered with a separate +5V supply. Everything runs normal except once in a while I get a random low signal on one of the chips on the READY pin which causes the MPU to issue a fault and shutdown.The datasheet says this is an error signal for the logic side under volt lockout, the isolated side under volt lockout, and the chip over temperature sensor. The diagram shows that the READY signal will return high after the voltages have risen above the min thresholds and chip temperature has lowered. However, the voltages from the supplies are above the UVLO thresholds on both sides and the chip temperature is nowhere close to its trip point. Also, when this occurs, the READY signal never returns high and only a total power down will reset it. Is this a noise issue locking up some function of the chip? I

I like the voltage regulator LDL212DR by sepification and want to simulate along with my other components. So need Spice model and requesting for a quick help. 

Hi there.I have been asked to look at your eval board, EVALSTPM-3PHISO. The question is, i want to use Rogowski coils, can this board accept them or do i need another product.Many thanksIan

Hello,We are investigating a recurring failure of an L7983 used in a medical device.Application:VIN ≈ 40 V VOUT = 5 V L = 68 µH Cout = 2.2 µF LCM mode Very light load conditions possibleFailure mode:5 V output lost. After removing the output inductor, LX remains shorted to GND. Resistance LX-GND ≈ 2.5 Ω. High-side MOSFET appears intact (no abnormal resistance between VIN and LX). Failure seems limited to the internal low-side MOSFET.Field observations:The failure is always preceded by a battery-related error. Batteries are often found degraded or unable to charge correctly. Similar failures have also occurred during production.Tests performed:Startup without battery. Startup with low battery conditions. Long-duration operation with low battery voltage. Heavy battery discharge during operation. Various startup sequences.No test has reproduced the failure so far.Measurements:LX peak ≈ 50 V. Undershoot down to approximately -1.7V No obvious overcurrent event detected.Questions:Have you se

HiI saw the pad dimensions for the SGT070R70HTO listed in the datasheet.But I don't know the dimensions of the parts I marked in red. So I want you to tell me that. Thank you.

Hi everyone,I’m developing an open-source project called Embedded Power Audit, a lightweight shell-based tool for inspecting power-management and thermal information on embedded Linux devices.The project has already been tested on several platforms, including: NXP i.MX6 NXP i.MX8M Plus NXP i.MX93 Raspberry Pi AMD/Xilinx Zynq I would now like to add support for STM32MP25.If anyone here has access to an STM32MP25-based board running OpenSTLinux, Yocto, or another embedded Linux distribution, I would really appreciate a very simple test:run the script and share the generated output with me.The tool is read-only and mainly inspects Linux interfaces such as: CPU frequencies and governors cpuidle states thermal zones memory information interrupts device runtime power-management settings other power-related sysfs/procfs interfaces Repository:https://github.com/br1pastore/Embedded-Power-AuditAt this stage I’m mainly interested in understanding which power-management interfa

Hey,I am having a big issue with ESD discharges and the STUSB4500. Essentially, I auto negotiate to 20V, and on ESD discharge, the STUSB shuts off VBUS_EN_SINK, while the supply continues to supply 20V. My thought is that on ESD discharge, the chip for some reason thinks it has had a disconnect event, waits for the supply to recover to 5V, but the cable has not been disconnected so continues to supply VBUS with 20V, and the STUSB then is in a hard stuck state until actual unplug and re-plug. There is no error seen, as GPIO does not pull low and is configured to show error states.I cannot find a document that exposes all of the register values, but after every shut down, the chip register state reads the same failure state. The dump is as below. # Before dischargeSTUSB4500 @ 0x28, registers 0x00..0xff 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f00: 00 00 00 00 00 00 12 00 11 20 00 63 fb 01 41 0a10: 0a 13 00 40 00 02 0c 2c 00 00 00 21 01 80 00 0020: 10 c8 5f 00 00 9c 00 02

Dear Team, We are using the ST8R00WPUR boost converter to step up the input voltage from 5 V to 12 V in one of our designs.We would like to conduct a design review of the attached circuit. Please review the design and share your feedback/comments.Additionally, we noticed that the Junction-to-Board (θJB) thermal resistance data is not provided in the datasheet. We would appreciate it if you could share the Junction-to-Board thermal resistance value, as this information will be helpful for our thermal simulation and analysis. Best RegardsAbhishek

We are studying the STDES-DABBIDIR 25 kW bidirectional DAB reference design (UM3198 Rev 2, TN1435, schematic and BOM v2.0) for a 30 kW EV charger power module. Two items in the documentation are not publicly available:1. A2H6M12W3-F: UM3198 uses two of these ACEPACK 2 half-bridge modules on the low-voltage side, but st.com has no product page or datasheet for this part. Has it been released? If not, what is the recommended production equivalent?2. Frenetic transformer, design reference 32011-04 (turns ratio 1.78, five stacked E80/38/20 cores), and the 28.6 uH auxiliary inductor: can ST share a specification or drawing, or should we request these directly from Frenetic?Thank you for any pointers.

Hello ST, I wonder if the top marking of STS10P4LLF6 is indeed 10P4L.Based on the latest datasheet (Rev 5, issued in Jan 2021), the top marking code is 10P4L.However, we received STS10P4LLF6 with “10K4L” but the date code is 2447. Could you please explain how this could happen?Best regards,