Power management

Following this issue, and the advice from ​@Didier HERROUIN, we have implemented the SYN and SCS initialisation,(see schematic) , and are still finding that our STPM32 chips are resetting their UART config during operation.For context, the firmware first pulses SYN 3 times, then SCK, and configures the STPM32 UART to 115200 baud. This runs fine for a few minutes, and then we detect a failure because the chip resets to 9600 baud for no reason, leading to a timeout on the microcontroller.The voltage supply to this device is perfectly stable at 3.3V.We have followed all advice regarding isolation and ground planes, as you can see in the attached PCB design.I desperately require assistance with this problem. My only solution now is to re-configure the STPM32 every time it resets, but this will definitely lead to inaccuracies as some energy measurements will be lost during configuration and timeout detection. The only common thread I can piece together is a hint from one Mark Germagian, who

In a larger design I’m using a LD39100PU33R for a 3.3V output. The input voltage is 5V and the device has decoupling capacitors as per the datasheet. The 3.3V circuit is consuming about 0.5A and the device is capable of delivering 1A. The circuitry connected is no inductive loads, but rather a steady consumption from sensors (air pressure & temperature).I am unable to find any information in the datasheet (Section 5. Typical performance characteristics) on what temperature the device will typically be at this load, but it’s running at a constant 75C. This seems to be very high, but how can I know if this is within spec when there is no graph in the datasheet showing current vs temperature?ref: datasheet https://www.st.com/content/ccc/resource/technical/document/datasheet/72/02/e5/ee/df/36/40/5e/CD00233788.pdf/files/CD00233788.pdf/jcr:content/translations/en.CD00233788.pdf

Hi,We designed a 24V to 5V DC-DC power supply using the LD1086DT50TR. However, we are experiencing an overheating issue. Our application load current is only 0.2–0.3 A, but the regulator temperature rises significantly. Could you please suggest a solution to resolve this overheating issue?

Good morning,I'm working on some new automotive designs and on the current boards i found what are , presumibly, STM components but i can't really identify them with the offerings in the online catalogs, (at least IF they are STM engineering samples)The body is specifically PowerSSO-16 but the marking of the components i found for now present similar but very different top markings2HTS90 D1B1HTS20 D11HTS10 200U2HTS30 D1B1HTS50 D1(these 5 are the ones i classified so far) Can i have some help in documenting them, if they indeed are VND productsBellow a picture of one of the components, there are all the same except the top markings (no logos or such)  

Hello experts!I’m developing a three-phase motor control application based on the STGIF5CH60TS-L. As suggested by the datasheet I have RC-filters at all low voltage inputs with the required 100ns time constant, in my case it’s 1kOhm and 100pF due to the driving limitation of the MCU’s PWM outputs of 4mA at 3,3V VDD. When I measure the input signals at the IPM, I can see a negative voltage spike for about 100ns which is clamped by an internal diode of the input structure. Naturally, this clamping voltage is around -0,7V and therefore lower than -0,3V given in the absolute maximum ratings. My question is now:Which current magnitude of negative injection can be tolerated by IPM?I could reduce the voltage spike by decrease the resistance in the RC-filter and increase the capacitance simultaneously. That will however require me to use a line driver between the MCU and the IPM, which is no nice solution in my opinion.Best regards!CHEG

The test conditions of VINCL parameters of VNS3V04DPTR-E chip are: Does light inject 1mA current into the IN pin, and does the SOURCE pin need to be grounded?

I’ve designed a flyback w/ Viper27HD.  Turn on voltage is 120Vdc.  Max design input volutage is 500Vdc.  Output voltage is 12V.  I designed the VCC tertiary winding for 16V, but due to spike rectification the actual votlage is 20.2V for Viper VCC.  The prime supply is a MagnaPower SLx-1.5-500-3-xxxxx power supply with voltage, current, power, control and + and - slew rate control. The Viper “wakes up” when the input voltage is at ~110V.  I have an internal POR circuit that holds off my controls until 250 ms later.  When the POR ends, the 12V housekeeping power is used to energize the gate drive of a FET from the input power rail to a large capacitor bank through a 40 Ohm “Soft Start” resistor.  When the gate drive initiates, the Viper chip shuts down for 22 ms which temporarily glitches the housekeeping power.  I’m using a FOD2711 isolation regultor for FB control. I observe: VCC of Viper is STABLE through the shutdown. VBR never approaches the brown out threshold FB switches hard to G

Hi everyone,I am using the STGAP3SXS isolated gate driver on my custom PCB, but I am unable to get it to operate correctly.I have attached my schematic for reference.I tested the driver in two different configurations:With all protection circuits enabled (DESAT, Miller clamp, etc.) With the protection circuitry removed/disabled (minimal configuration)In both cases, the behavior is exactly the same.ObservationsPin 13 (DIAG) remains HIGH. Pin 14 (RST) also remains HIGH. No gate output is generated.According to the datasheet, DIAG is the diagnostic output and RST is the active-low reset/shutdown input. I expected the device to operate normally when RST is kept HIGH, but the driver never starts.I have verified:Logic supply (VDD) Isolated gate supply (VH/VL) Input signals (IN+ and IN−) PCB connections and solderingHowever, the behaviour remains unchanged in both hardware versions.Could someone please review the attached schematic and let me know if there is anything obviously incorrect or i

Hi,I wish to buy this evaluation board:EVAL6470PD | Product - STMicroelectronics However, it's flagged as obsolete. Does this mean that POWERSO36 package of L6470 is not recommended for new design?Many thanks.WH

I need a help to find out which partnumber matches the diode below: 

Hello.We meet the overtaking around 200M Hz, the base frequency is around 20M. I have the below questions: where does it from?  Is it be spread spectrum?  what’s the relation with the pump frequency? what’s the countmeasure of the overtaking issue?

Dear all. I am currently planning to design a circuit without a DCDC, following the sequence VBat -> VDH -> VBP. To apply the L9908 to a 48V system, is it sufficient to set the voltage applied to the VBP pin from the DCDC to 36V or lower,as shown in Figure 91 of the datasheet?If so, what is the reason for using it in conjunction with a transistor like Tvbp1?Alternatively, what happens if only Tvbp1 is used without the DCDC?Since VDH and VBP each have monitoring functions, wouldn't there be no problem using them separately?  Thank you.

Hi all,Ive been hand-populating prototype boards around an SPV1050 and for 2 out of 2 boards so far I’ve noticed the SPV1050 being defective right from the beginning. I then replaced the IC  via hot air rework and it worked flawlessly. That makes me wonder if my soldering setup kills the IC.Im using chipquik low temp soldering paste (the syringe is pretty empty, so it is far from fresh) and a Mini Heat plate with the default profile:80 sec rise to 150°C 80 sec rise to 170°C 60 sec rise to 230 90 sec keep at 230°C for soldering slow cooldownAre there any AN’s for this IC regarding soldering? I could nto find any info…Thank you for reading BRDamian 

Title: Bug Report: STM32G474 Vienna Rectifier firmware – TIM7 16-bit ARR register overflow (Wrong interrupt frequency)Hi everyone,I want to share my experience and a bug I recently discovered while working with the vienna_stm32G474 reference software (generated via ST eDesignSuite).🔍 The ProblemThe interrupt frequency for TIM7 was measured at 8734 Hz instead of the configured 2000 Hz.⚙️ Cause of the BugThe issue stems from the generic timer initialization function used across the project:cvoid DPC_MISC_ApplTimer_Init(TIM_HandleTypeDef AppTIM, uint32_t APPL_Freq_Desidered); This function assumes it is always dealing with 32-bit timers (like TIM2). However, TIM7 is a 16-bit basic timer.When calculating the Auto-Reload Register (ARR) value for the desired 2000 Hz frequency at a 170 MHz clock, the following math occurs:cTimers_ClockARR = (170000000 / 2000) - 1; // 85000 - 1 = 84999AppTIM.Init.Period = Timers_ClockARR; // Assigning 84999 to a 16-bit register Because TIM7->ARR is onl

Are there any more resources to understand how to use STEVAL-HARVEST1, how does the energy flow from super capacitors to the MCU and also the back up capacitors. I feel few things are missing the schematic and the user guide. I want to first implement a small UART program with energy harvesting. Can anyone guide through steps in achieving it. How to connect this to board, does it mean I need to add any external wire from harvester solar panel and short it here?I have read https://www.st.com/resource/en/user_manual/um3539-getting-started-with-stevalharvest1-energy-harvesting-board-for-nucleowl55-stmicroelectronics.pdfhttps://www.st.com/resource/en/schematic_pack/steval-harvest1-schematic.pdfhttps://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=11369460Thanks in advance.

Schematic review needed, considering given standards IEC 610004-2, 610004-3, 610004-4, 610004-5, 610004-6, 610004-11, CISPR 14-1 CLASS A.I have attached screen shot of my schematic, please go through it and check.The screen shot containsSTPM33 IC section, Reset and Digital isolator section, Control reset section CT section,Please do review it. We are designing it for 115VAC with multiple loads on CT which vary till max 1A load.Any changes/recommendation are welcomed.Thank you.!! 

SummaryOn an STM32WB5MMG module (STEVAL-PROTEUS1), with BLE advertising active and theapplication configured for Stop2 low-power operation, the device reaches theexpected Stop2 sleep current (p50 ~ 7 uA) ONLY after a debugger-mediated reset(STM32CubeProgrammer: -c port=SWD mode=UR -rst).After a cold power-on reset (POR) - removing and reapplying the supply, the realdeployment scenario - it draws a constant ~9 mA and never enters Stop2, eventhough it otherwise runs completely normally (RTC cycle runs, BLE advertisingworks, application data updates). This is 100% reproducible and deterministic.Deployment-critical: in the field the customer inserts the battery (= POR) -> 9 mA-> a 10 Ah cell lasts ~47 days instead of the intended multi-year lifetime.Hardware / Software- MCU/Module: STM32WB5MMG (STM32WB55 die) on STEVAL-PROTEUS1.- Wireless stack: BLE_Stack_full V1.24.0.3 + FUS v2.2.0. First seen on V1.19.0 /  FUS v1.2.0 and UNCHANGED after upgrading to V1.24.0 (the stack update did no

I am connecting IPMM15B’s J2 to IHM09M2's J7. There are  documents showing how J7 is aligned and where it is situated on the board. But I have no idea how J2 is oriented. The schematic is too brief. It could be opposite aligned if I turned the board around to the inverse side. I don’t know how the pins should be connected. I need to know where pin1 pin2 is situated on the board.  

Hi,Good day,may we seek your expertise regarding L9959U/L9959T.is there any difference for these mpn below?L9959U-TR-D L9959T-TR-W L9959U-TR-W thank you.

Dear Sir/Madam,We use STPS20200CG-TR Schottky diode in our unit. This diode has operating junction temperature range -40C...175C and storage temperature range -65...175C. Our unit must start operating at -55C. Will STPS20200CG-TR operate at -55C ambient temperature without being damaged and which parameters may deteriorate?Thank you,Alex  

STSW-WPSTUDIO is not on ST.com and the links to Github dont exist anymore. How do I upload firmware on the STWBC86JR? And where can I get the firmware that needs to be uploaded? 

I am using an LDL1117S50R fixed voltage, 5 V regulator. I am regulating down from +12V to +5V. Our +12V supply is clean.It’s a pretty simple circuit; one 1 uF capacitor at the input, and one 100 nF, one 1 uF, and one 4.7 uF capacitor at the output. I don’t need an enormous load; 500 mA is sufficient.It was working great at first, but once I reach a load of about 200 mA, it began oscillating unstably at about 2.2. kHz. See the screenshot below. I was using a Rigol electronic load to test this. This problem also appears to be intermittent. See the screenshots below. It’s fine, and then unstable, and then fine again, and unstable. The period of instability is not consistent. My PCB is good. The input and output caps are close to the pins and I’ve used low ESR ceramic capacitors.Does anyone have any idea what this may be?

I require urgent technical support regarding a VIPer22A-based dual output power supply design (5V/800mA and 12V/200mA).I have designed and manufactured the transformer according to my calculations; however, the power supply is not operating properly. I have attached the following documents for your review:Schematic PCB Layout Transformer Design DataI would appreciate it if you could review the attached files and provide your feedback and recommendations as soon as possible, as this matter is highly urgent and is currently affecting our development schedule.Thank you in advance for your support. I look forward to your prompt respons

STP80NF55-06 MARKING is not same datasheet.Product show marking : P80NF55@ 

Hello,I use a STPM32 on a battery charge system. The STPM32 is associated with an ESP32 module.The driver used is from ST (V1.0, 17 may 2016).I want to detect some defaults with interrupt, and I configure the interrupt mask only for current and voltage swell.But when I launch a battery charge, an interrupt is triggered (the period error interrupt) which is not masked.I don't understand this behavior and don't find an answer in the datasheet.Any help would be appreciated !Best regardsGilles.