Power management

Hello ST community,I have two STEVAL-WBC86TX transmitter boards that appear to be locked. The boards still charge a phone when powered, but the I²C reset tool provided by ST cannot communicate with the main IC. I've tried FT260 recovery tool.    I would like to know whether there is a recovery or reprogramming method. Thank you for any guidance.

Hi, We have been testing our H-bridge on 2 EVALSTGAP2HDM with IPP026N10NF2S MOSFETs. The gate resistances are as per the EVAL board. We are seeing huge ringing on the gate signals for the low side FETs on both boards with no load connected. The high side gate signals are clean and no ringing is observed. We have tested the board with both +15/0 V and +15/-3 V configuration and ringing is observed in both cases. I have attached the gate waveforms for the low side FETs for both configuration. This gate ringing is then translated to the output voltage waveform with huge VDS voltage overshoots, sometimes double the DC bus. The DC bus voltage is 24 V, switching frequency of 100 kHz and the dead time inserted is 100 ns. We expect the Miller clamp to be working here but it seems it is unable to do it. We are unable to load the circuit because of this current issue. We would appreciate you quick response to solve this issue so that we could proceed for further testing phase.

I would like to identify the following two diodes, please.

Hello,I want to adapt the STGSH50M120D to the circuit I already have working, but I have a question about pins K1 and K2. Will there be any problem with the STGSH50M120D if I don't use K1 and K2, leaving them disconnected?   

Hi,We are using STSPIN958 for BLDC control, and under 33V, 2A, when external force applies to servo, and the current goes up to about 2A, the chip burns before the thermal shut down kicks in.I would also like to know the value of "Tsd" delay timing parameter in thermal shutdown sequence: Figure 16 of page 21/34 of its datasheet. This value is not published.Thanks,Amin

Dear ST Community and Experts, I am facing a persistent SPI error (SPIE bit set) issue with the VN9D5D20FN high-side driver and would appreciate your help in troubleshooting. 1. Problem Description: I am attempting to write to specific control registers via SPI, but the device frequently sets the SPI Error bit (SPIE), indicating a communication fault. The issue is particularly reproducible with certain registers and bit operations: When writing a '1' followed by a '0' to bit 2 of registers 0x01 and 0x02, the SPIE error occurs almost every time. Interestingly, similar write operations to registers 0x00 and 0x03do nottrigger this error. Write operations to register 0x13also occasionally cause the SPIE error. 2. My SPI Configuration:

HI!   We have from time to time defect High Side Driver. Most of the defects occur after the first few power on cycles.  The High Side Driver and the RGND Resistor (120Ohm) gets really hot. The resistance between GND and the Status Pin is then much lower around 160Ohm to 2kOhm instead of 12kOhm.    Might it be a Problem when there is only the 24V Power Supply and the Status / IN Pin has no reference Voltage?  There are cases when the 5V comes later or not. Does this destroy the internal Logic Circuit?    Did somebody had some similar defects?   Any help is much appreciated. THX

Hello! I am building a 50-600Vin flyback converter using the altair04-900 to power an LED as a student project. Due to the very light load I expect it to work in Burst mode. Currently I am looking for an adequate transformer. On this regards my question; which switching frequency should I expect? The datasheet talks about 2-8kHz around burst mode threshhold. Does someone have any experiences with the operation of this IC in burst mode?

This is to turn on MOSFETs that operate above 5.2V supply of the Boost regulator.  I have followed a forward converter guidance roughly in one of the application notes, but I have not used a transformer but placed a high value resistor in the voltage doubler output.  How much can I reduce the resistor values R6 and R69 without disrupt the operating of the SPV1040?  Reducing them to 1 to 10K would be good.  The input is limited to 4.5V so that a diode is not required between LX and Vout.  The application is

Hello, We are looking to use the Wlc38 in Bi-directional mode alternating between RX and TX digital pings. We are wondering how much power consumption the digital ping takes and for what duration so we can calculate power consumption of pinging at various intervals. Thanks,RJ

Hello everyone,I am finding to drive for 4 cabin lock. For this, VNxxx or VNQxxx series help me. I don't need high current. It is 1 amper per channel(per output.  I'm looking for a chip that will not cause any supply problems and will be produced continuously. Is there anyone from ST who can help?

HiIs it possible to bypass the boost by applying a 5V voltage directly to BSTOUT (VLXBST is left unconnected)?Thank in advance for your reply

I can't read référence; I am asking if this component is a zener Diode? And I'm looking for any équivalence  

I found the ACS108-6SA that seems to fit my needs.   1) I will control the gate with my stm32G0B1 uC. I really don't understand why I have to connect the 24VAC Neutral to the +3.3VCC of the MCU ! It sounds like dangerous no? i can understand that the current for the gate need to loop somewhere but why to connect the +3.3v to the neutral ? This device seems to fit my needs and seems to have been designed for this purpose, but the schematics looks really strange at the moment to me. 2) Concerning my need to switch on / off big pump grundfos sba3-45a that is 230vac. this pump looks to have a big capacitor Should i use triac like T410 ACST1235-7GTR for example or ACST1635-8FP ? I have also pure inductive 88W air bubble to connect on it that pollute a lot the 230vac line when switch off.

Hello!I am currently designing a flyback converter with the altair04-900.The .lib file in the spice model folder is encrypted. I cannot open it neither with Altium nor with ltSpice.I would like to know, which simulation software can decrypt it? And, more specifically, if there is any free simulation software?

Hello, I'm considering using Viper12 to 3Phase AC/DC non isolated buck converter 5V 60mA Vout. I found some application notes like AN1357. But is it reliable? Or will it cause problems in long-term operation? Has anyone experienced it before? Thanks, Gökhan

I want the specific Ron data corresponding to different VGS values (e.g., 8V–15V) when the MOSFET switch SCTWA70N120G2V is in the linear region.

Edited by a ST moderator: Update the title and the content with the part number Hi,I'm using LD1085D2M-R regulator. There is no certain information about output capacitor ESR limit value for stabilization.  -Input : 5V -Output : 4V @3A -Desired Output Capacitors : 2x10uF 10V   Can we use Ceramic capacitors with additional series resistor? In this case what is required resistance value?  

We are using BTA41-600BRG triacs on our temperature control boards to turn on 240V tank heaters. The tank heaters are 1500W, 3000W, or 4500W depending on the unit model and operate at 240VAC. The circuit we are using is attached. We use a FOD4108 driver to activate the triac.We have seen at least 2 cases recently where the triac continues to conduct even after the trigger for the driver goes off. In both cases, when we move the PCB to a different unit with the reduced load of 1500W heater, the triac works normally and turns off when we turn off the trigger. In another simulation with the failed triac on the larger size heater, if we turn off the unit while near the setpoint temperature, then turn the unit back on, the PID is working and we pulse the heaters; and in this case it is working okay also (triac shuts off when trigger shuts off). But if we turn on the unit when the temperature is far from the setpoint and the heater is on 100%, it never turns off when its gets close

We are looking at using the TCPP03 and TCPP01 for a system with a dual-role power port and a sink port. We want to use this dual MOSFET with both ICs (a dual MOSFET is needed for the TCPP01 to prevent backflow): https://fscdn.rohm.com/en/products/databook/datasheet/discrete/transistor/mosfet/aw2k21ar-e.pdf The MOSFET has a Vgs(min) of -2V. There isn't much information about the gate driver circuits in the TCPP01/TCPP03 datasheets. Does the integrated gate driver drive below 0V when turning the gate off?Thanks

Hi Sir, I'm looking for the data sheet and programming guide for the STWLC38JRM to develop the off-line programming algorithm. Would you please share such information for reference. Thank  you. 

Hello,I'm developing a Qi compliant product (Not getting Qi.) using STWLC38JRM.Please respond on Operating Frequency and ASK modulation cycle to get back to the testing agency.[Operating Frequency]Qi standard defines the operating frequency from 110 kHz to 205 kHz.Is it possible for STWLC38 to set (limit) operating frequency?Or does it depend on the settings of the transmitter (e.g. STWBC86)?The CFG file is provided by the customer, so I don't know the detailed settings. However, using "STSW-WPSTUDIO V2.2.5",I have confirmed that "OP FREQ" shows approximately 139 kHz when charging in BPP.[ASK modulation cycle]I believe STWLC38 sends an ASK modulated signal towards the transmitter.

Hello Team   I have a general query.    Do we have any 555 timer with ASIL-B or ISO26262 compliant.    I am interested in discrete level solution rather going with MCU and my aim is to have redundant control/ feedback/LIMP HOME mode embedded in the 555 timer so that i can achieve functional safety requirement.   Thanks Kesavan

Hello,Our customer has inquired about the meaning of the last three-digit code in the marking on the L78L15ACUTR.For example, some parts are marked with "8L218" or "8L243" on the top surface.Could you kindly explain what "218" and "243" stands for?Thank you in advance for your support.

Hi, dear. Could you please help me find the datasheet for the MOSFET with part code GF329MB, as well as other compatible MOSFETs with similar specifications?   Thank you in advance for your help! Hi, dear. Could you please help me find the datasheet for the MOSFET with part code GF329MB, as well as other compatible MOSFETs with similar specifications? Thank you in advance for your help!