Power management

I'm trying to combine an external +24V power source and the 5V USB power source into a single step-down converter to generate 3.3V.The USB power is managed by the TCPP03 chip for both providing and sourcing power. On my 24V line I have an eFuse TPS26400 which can be simplified as an ideal diode.Is there a way to combine both voltages (behind TCPP03 and behind eFuse) ideally without diodes (OR'inged diodes are too inefficient)?

Hello, I am an absolute beginner.  I am trying to create my first project to use with my STEVAL-HKI001V2 board. I cannot find this board in the list of boards to select from. How should I deal with the situation? Is there a way to add/import more boards, including this, to the list? Thank you!

Hi All,  I have a circuit that works very well and uses the BTA24-800CWRG device housed in a TO-220 through-hole part. I currently have it bolted to a large enough heatsink and a fan above it just for safety and to keep it cool. I am now updating the design and would like to miniaturize the circuit. I am looking at this ST part: T3035H-6G-TR. This is a surface mount version and I would prefer to use this instead of a large heatsink on the board. I use the TRIAC in a pulse-skipping circuit to control a 120V 10A heating element. I developed a circuit to sense the zero cross and fire the TRIAC based on temperature and feedback through PID control. The TRIAC turns on during a percentage of multiples of the AC sine wave and stays on until the sine wave reaches the zero cross where the TRIAC turns off. Hard to explain but I hope you get the idea. My question is, can I use a surface mount TRIAC for this particular application? Since it is essentia

Hi,I was studying your product L9305 in order to drive proportional valves and it was not clear to me if was possible to use it without the external fail safe switch. Is there a way to bypass it and not mount it?Moreover, if I want to use the 4 channels in parallel, does it means that the maximum current per channel remain the same?Therefore, does it guarantee the drive of either 4 Valves (2A each) or 2 Valves (4A each, 2A per channel)?Thanks.

How do i set the STUSB4700 so that it sources 12V 3A with the help of the GPIO pins (NO SOFTWARE)I read in the datasheet that there are several standard PDO configurations, selectable via GPIOs. But how? How do I say that i just want the PD controller to source 12V 3A?  Thanks in advance

What happens if I use STUSB4700 in my application but I do not communicate with the STUSB4700 over I2C? Will the STUSB4700 negotiate a contract as a source with the sinking device and offer the PS FB voltages which are connected to the GPIO? I would like to provide a maximum of 15V by leaving GPIO3 and GPIO4 open circuit and negotiate a 3A maximum to the source which I believe is the NVM so I should have to communicate over I2C. I would like an automotive grade part but maybe the STUSB4710 would be the only solution for me?

Hi ST Team, We are using EVLONE140W Module to evaluate AVS feature in PD3.1. We understood that this module is also be controlled externally. Please find the attached. I could not get much information her. https://www.st.com/en/evaluation-tools/evlone140w.html#documentation Could you please send us the procedure to communicate via UART? Also the command list, with descriptions of each command.   Thanks,

Hi Team,Could you please advice the marking of LD39015M12R, whether P712 is correct?Please help to respond asap. Thank you  

Hello.I would like to ask about the procedure to exit the stand-by mode of STGAP2HD. It seems that the procedure described in the datasheet does not work.We can enter the stand-by by setting INA, INB, and BRAKE high while keeping the SD low for 1,5 ms. We can see that the driver enters stand-by as it will not switch if we send any pulses on the input.But then we are not able to exit the stand-by. We set the INA and INB low for several seconds while keeping the BRAKE high and SD low. Then we set INA, INB, and BRAKE high for 100 us while keeping SD low. Then we set the INA and INB low. It should be exactly as described in the datasheet, but the driver still will not switch if we send any pulses on the input.Therefore I would like to ask if there is a mistake in the datasheet because we are following the procedure but we are unable to exit the standby.Thank you

Hi!Can someone please confirm the date code:Trace code as shown on label is 9995120YPart marking label: 9920Y  951 Is the date code 951 which means 2009 ww 51?  Datasheet shows this device was released 2006, and EOL on 2018.

 您好，實驗室有用到您們生產的VN808CM_E產品，關於產品規格表的電流-峰值輸出有疑問(圖一)， 0.7A是指八個通道總共的最大電流嗎? 然後我看這個產品每個通道的output一共有兩個是互相連接的(圖二)，這樣會導致輸出的電流變更小嗎?(700mA / 8 / 2= 43..mA (每一個output的電流)) ，如果我打算在output連接端用電流去驅

Dear Sirs, Could you advise me dynamic resistance(Rd) of TVS such as SM6T33CAY used to clamp against pulse 5B per ISO 7637-2 or load dump B in ISO 16750-2.  Its voltage source waveform is clamped instead of exponential surge curve. Thanks John 

STNS01 data sheet dated 14-Dec-2017, Revision 4, schematic is enclosed. What precaution are recommented to prevent the chip going into oscillation. On value of Cap, pcb trace length, rated voltage (MLCC capacitance drops when DC is a good percentage of the maximum rated voltafe) and physical size.  Does size affect ESR, equivalant serial reactance.Time ago, first generation 3 terminal regualtor 7805-type has quite strict specification on by pass capacitor, likely due to small phase margin of the chip amplifier and feedback.  Wonder if these may be relaxed somewhat nowadays.  Pointer to reading notes specific to STNS01 is appreciated.If we wire up the chip and it does NOT oscillate.  How to determine system phase margin to see if it is safe and far away from oscillation threshold point  or it is getting dangerously close to the point of starting oscillation ( when temperature or c

Dear Support, in the data sheet of LED2001, it provided the layout reference, but it didn't mention the copper thickness. for the demo board, what is the copper thickness in oz of the PCB of.STEVAL-ILL054V1,  Thank you very much, David 

Hi, In one of my designs, I used the L6981 5.0v low-noise variant. I followed the datasheet, and this was my first time using this chip. However, I added an option that separates the AGND and PGND pins with a ferrite bead which is not present in the datasheet. As shown in the schematic with a red arrow below:When this ferrite bead is present on the circuit, the L6981 fails to boot properly. Thus gave 2.5v output with a strange signal shape (below). 

Hi There, I want to try the L9963 development board. I downloaded the GUI but I get an error. I go to the site from the warning and upload but my problem persists. Could I be having this problem because my computer is Win10?Does anyone have a solution? 

Dear Support,I have a design which works fine even drive it full PWM with 0.025 ohm (4A max current). we need to control the backflow current so added a diode on the power supply path.  the schematic is attached. C169 and C170 not installed. it works fine when PWM set to 50% or even 75%. but once set to 100%, the chip will be damaged in 1 or 2 second. I don't think it is a thermal issue, because the same design and layout was used for a long time. something happened that cause the chip entered a nonstable state. any suggestions that can make the design more stable. Motor_Enable is a powerful 12V supply. Thank you,David   

Dear STM, May I know do you have product roadmap for Qi2.0 compliant 15W RX, due to obsolescent of Qi1.3 on 2026. 

for LED2001, the marking on the chip like LED2K1xxxx118. or xxx125. how to understand the Marking under the LED2K1? Thank you,David

Hi All,As mentioned in the datasheet for part the part STPS10200SF, it was stated that cooling will be conduction cooled.Please clarify that the cooling method will be either top cooled or bottom cooled.Thanks in advance.,Ganapathy Raman.I

Hi all,I am designing the custom wireless charging receiver using the STWLC38JRM chipCurrently, when I put the circuit on the wireless charging pad (Qi standard), I notice that the STWLC38JRM chip does not output 5V at the VOUT pin. Below is the schematic, I copied all the things from the STDES-WLC38WA board, the coil part number is 760308101219 but the circuit does not work, the only thing that worked is the I2C communication, when I supply 5V to the VOUT pin, I was able to communicate and read ID chip.and Below the schematic is the scope that I captured when put the circuit on the wireless charger padRed is AC1, green is AC2, yellow is VRECT, and blue is VOUTI see the VOUT is still 0V and the AC1, AC2, and VRECT waveforms look like wrong.Currently, I don't use the temperature sensor NTC so I designed a 100k resistor pull-down and 100k pull-up to VAA at NTC (F1 pin).Can you guys help me fix this issue?Thank yo

Greetings. Please help me identify this component. Thank you Another variation? 

Hello,I need some information on the thermal resistance Rthja and Rthjc of the STM6710 (package SOT23-6L). Could you please send some technical information like a datasheet which we can forward to certification authority?I often miss this information in STM's datasheets. I searched the community posts and detected that other users also miss it many times for many types of components. Is there a reason why it is not published in the datasheets together with other important data? Thank you in advance! Best regards Wolfgang

Hi,I am concerning about the L6482 current control parameters that are explained in the AN4158.I assume that tSW, tON_MIN, tOFF_MIN, tOFF_FAST, tFAST_STEP reflect the relevant registers. So:1. Peak current control with auto adjusted decay: - tOFF: this parameter is not mentioned in the datasheet. Does it reflect TOFF_MIN register if predictive current control is disable?- TSW: does this register value have any effect if predictive current control is disable? Since switching frequency depends on tOFF and tON_MIN?

I have a WBC2TX50 eval board along with a STEVAL-WLC98RX for testing Qi powe transfer. When I try to make the transfer, the WBC2TX50 board does not go past FSM_PRE_PING_STATE, either with the WLC98RX or with a phone, both of which work with a standard Qi transmitter.The circuit does respond to the coil (MeasQfactor is 156 free, around 76 with the WLC98RX coil and less than 20 with foreign object). Why is the TX50 board not going past this stage? Do I need to configure something past the default settings for it? Please advise, thank you in advance.