Power management

I am planning to purchase the EVLSTGAP3S6S evaluation board for my research. While reviewing the datasheet, I noticed that the board is specified to support a high-voltage rail of up to 520 V, limited by the MOSFETs and capacitors. However, I observed that:The board uses SCTH60N120G2-7 SiC MOSFETs, which are rated at 1200 V, 60 A.The film capacitor used (C4) is rated at 1.1 kV (Panasonic ECWFG1B335J).Given that both components have voltage ratings above 1 kV, I would like to understand why the maximum voltage rail is limited to 520 V. I need to assess whether the board can support higher voltage operation (e.g., up to 800 V DC). Could anyone kindly clarify the reason for the 520 V limitation?

Application : We are developing a AC switching circuit using dual MOSFET configuration. The application is for driving the 208VAC, 480VAC, 40A AC heaters to control its temperature.1. Is it preferred to use MOSFET or IGBT for this?2. Which MOSFET series is preferred for this application?We are planning to use switching frequency of 5-10HzAlso can i get the I^2t value of TO247-4 and TO247-3 package MOSFETs , as we are looking for through hole package MOSFETsRegards,Meghana

Hello All,I am using L7987L to generate +15V from 24V. I have 10 same boards wherein I have used the same circuit (see below), I am able to generate 15V for 2 boards but in rest it is generating 1.22V only. R191 is 6.8kohm and diode D36 is US1M-E3/61T.SS pin is showing 0.07V onlyPlease note there was no change in layout for working as well as non-working boards. I have checked all individual resistors as well as replaced IC too. still the issue persists.

Hi Sir, I would like to explore a specific use case that deviates from the standard design. My goal is to modify the EVLVIPGAN50PD to achieve a fixed 12V output, bypassing the USB PD negotiation functionality entirely. My intention is to utilize only the motherboard circuit, which contains the VIPERGAN50 and SRK1001, and not use the daughterboard with the STUSB4761 controller.Could you please provide some technical guidance on what modifications would be necessary to the motherboard circuit to achieve stable 12V regulation? Since the voltage feedback loop is currently managed by the STUSB4761 on the daughterboard, I assume changes would be required to establish a fixed reference for the VIPERGAN50 on the motherboard.For example, on the daughterboard schematic, a resistor divider (R36 and R37) is used for voltage sensing. I am wondering how a similar feedback mechanism could be implemented directly on the motherboard circuit to set th

Hi,I'm interested in the Mastergan5 IC.To evaluate it for our use case in a Class-D amplifier we need information about switching losses.These are commonly provided by suppliers of half bridge ICs by providing the Eon and Eoff values over switching voltage or by providing Coss and Ciss over Vds.Are there similar information or even a simulation available for the Mastergan5 IC?

Hi,We are implementing STM6600 push button controller for our design and we have below queries. Is there any pull up connected to PS hold pin, can I connect this directly to 3.3V logic MCU.For variant STM6600DU25DM6F, tON blank is 11.2s, Do we need to hold PB button for 11.2 for power EN deassertion, or if we set PShold to high within 1 or 2seconds, power on will be successful. Regards,Gowthaman

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.

I have already using L9524C IC for glow plug controller. I have to must to learn that what is the maximum duty cycle value of Control Input (CI) PWM signal?And if I have apply continuous HIGH signal to Control Input pin, how L9524C works? Freq. is 40 Hz.

I just need some clarification regarding the STUSB4710QTR.I'm designing a USB-C power source where a USB 2.0 hub will supply 5 V/5 A to a USB device. The connected device is a USB cellular modem, which typically draws a continuous 5 V/3 A, but requires brief pulses of up to 5 V/5 A during transmission.I would like to configure the SEL_PDO pin for this application without using I²C. Could you please confirm if there is a default PDO profile that supports this, or if the SEL_PDO configuration allows selecting a 5 V/5 A contract directly?I've attached a reference for your review.Please let me know if everything looks in order or if you have any recommendations.Thank you in advance for your support.

HiI am using L4985A for my 110W PFC design. During testing boost inductor current is getting distorted when i increase the load. And also, audible noise from the boost inductor. Here I attached the waveform. I used eDesign suite for designing and simulating the design. I am attaching my circuit herewith. Please give your suggestion to solve this issue. Below given the eDesignsuite design page.https://eds.st.com/pfc/?msg=%7B%22data%22%3A%7B%22application%22%3A%22pfc_html%22%2C%22specs%22%3A%7B%22ic%22%3A%22l4985a%3Apfc_boost%22%2C%22input%22%3A%7B%22v%22%3A%7B%22min%22%3A90%2C%22max%22%

HiI am looking into STC3115 for a device, powered by a LiPo battery. The battery is not removable, main CPU turns off during low-power states.Looking at the AN4324 system integration manual, it describes the procedure to use the embedded RAM to save and restore some register values. But... why? If the fuel gauge does not lose power, its register values should be maintained. If it does lose power, the RAM itself will be cleared. What am I missing here? I think that on boot, I should just check if BatFail or PoR is 1, and write default values if they are. In what scenario are the configuration registers cleared, but the RAM - maintained?In addition, what if the user charges the device without the main CPU running? In that case, the RAM restoration would overwrite the SoC value in the gauge?Am I right to think that this whole business with the RAM save/restore is intended for some different device setup?Thanks for any input

Hello,I'm encountering an issue with the ST1S12G18R DC/DC regulator. I've attached the reference schematic from the datasheet and my PCB layout, created in Altium. As you can see, my design matches exactly with the reference schematic provided by ST.According to the datasheet, with approximately 5V input and the recommended reference schematic resistor values, I should obtain 1.2V at the output (56k ohm resistor used for both feedback resistors). However, I'm consistently measuring around 4V instead of the expected 1.2V.Because I specifically need a 3.3V output in my design, I adjusted the feedback resistors to 150 k ohm and 33.2 ohm. Still, the output voltage remains stable at approximately 4.3V when the input voltage is in the range of 4.5V to 6V. Only when the input voltage drops below 4V does the output voltage start decreasing accordingly. This behaviour indicates to me that the feedback loop may not be actively controlling the output voltage as intended.

I need to calculate and estimate the required thermal resistance and temperature in operation for thermal design. When I read in Section 3.1 of datasheet, I do not see the Rja I can use directly, instead, it presents a chipset configuration with various Rja parameters. What does the chipset configuration stands for, is this configuration for 3 VNH5019A-E chips or 3 partitions in one VNH5019A-E? and how to understand Table 17 (thermal calculation in clockwise and anti-clockwise operation)?

From what I can read on this diode it is from ST for sure, and it says VU beside the logo, the next line is M R, and the last line is GP922.   Any help would be appreciated.

Hi,When we were using the STWBC86JR as the wireless charging TX, we encountered a problem. The design is defined as wirelessly charging the battery and supporting the product's operation. The tested charging efficiency was relatively low, only 43%. When the device was turned off, only supplied power to the battery, and the efficiency was only 32%(the battery was set to current limit). This means that a large part of the energy is converted into heat energy. We have adopted a cooling solution, but still hope to improve the charging efficiency. Can I ask if you have any suggestions? The currently used TX coil is 6.2uH, with a diameter of 20mm. The working frequency measured at stability is 102kHz. We found that reducing the spacing between the TX and RX coils can increase the efficiency by 50%. However, since the shell (about 2mm) cannot be thinner, reducing the spacing is not feasible. Currently, there is no other solution. Could you help us find some

Hello experts, I have a question about how to determine the resistance value.In STEVAL-WLC38RX circuit schematic, R4 = 200, R5 = 200, R6 = NA.What is the idea behind the values you set?The electrical characteristics in the datasheet for STWLC38 state Imax = 0.3[A](*1) when Vrect = 5 to 10[V].   (*1)Non-repetitive 100 ms rectangular pulseAre the resistance values based on these ratings?Or is it set based on an experiment?For now, I plan to use two of the same resistors as on the evaluation board.Note that only the BPP will be implemented. Regards,

Hello Team, I am looking for an N channel MOSFET as Low side switch for Capacitive Load.Application is to generate sharp negative pulses as below.Supply Voltage range: 25V to 450VPulse width: 25nsec to 9usecPRF: 0.5msecPulse current is 8Amax for 9usec.MOSFET Gate is driven with a gate driver of 1A current source/ sink Thanks  

hello dearwe have this BULK ID, and i want to know wich is the DATA CODEcan you help meor i have to give you the trace code?

Hello! I'm developing a project with the L6480H integrated circuit, using the EVAL6480H board for SPI communication. However, I have a problem: the L6480H only echoes the commands I send via SPI. Regarding the hardware, I soldered the jumpers JP1, JP3, JP5, and JP8 according to the UM1685 manual. When I turn on the EVAL, the FLAG LED lights up, and the board only echoes it. Even after resetting the STDBY_RESET pin and getting the STATUS register, the board still has the FLAG active. Could you please tell me if there's anything I can do? Or if there's a procedure to initialize the board? I couldn't find it in the manual. Thank you for your attention!

Hello.I would like to know the maximum Tj value of L78.I think the junction temperature of silicon semiconductors is generally 150°C, but the data sheet states that the operating junction temperature range is 0 to 125°C for L78 and 0 to 150°C for L79.The solid line in Figure 31 of the data sheet seems to go up to 150°C,but is the starting point for thermal design 125°C?Thank you in advance.

Hello Team，I found both STTH20003TV1 and STTH20003TV are available on the market.Unfortunately, I cannot find STTH20003TV1 in ST datasheet.STTH20003 - 300 V, 200 A Ultrafast Diode - STMicroelectronicsCould you provide the difference between STTH20003TV1 and STTH20003TV?What's the meaning of suffix '1' in the part number?Many thanks!Robert

I am using a STPD01 in a design for USB PD. Neat little part but I'm finding during testing that setting 15V output on this part immediately causes it's internal switching FET that most be located near the PVIN/VCC pins of the package to self destruct and short. The result is package damage and enough current is drawn to vaporize the large copper pour next to it. For values below, say 13V, it has been fine. Is there anything non-obvious I missing in the schematic here? The chip should be fairly straight forward.The PPOWER_P input is 21V during testing and there is no load on the output.

I'm trying to identify this two terminal components. It has these identifiers on it "CBJ GP 950", but there is a chance the GP is a 6P, but G looks correct. There are not cathode markings so I'm guessing it's not a diode, unless it's bidiretctional.  Please help!    

HI Sir，we have two different results of the ripple noisebase on same PCBA design, but different L7987 origin:1. Mark of "ST e3 G9207，L7987， CHN 3L0"，ripple noise 2.2V 2.9KHzinput 24V， output 12V， load 5ohm 2.4A 2. Mark of "ST e3 7B658， L7987， PHL 037"，ripple noise 0.04V input 24V， output 12V， load 5ohm 2.4Athe image of the chip and the image of the ripple see below.why is it like that, it make no sense，could you please advise.thanks.with best regards,PZhaL7987 CHN 12V 2.5A, 24V

Good morning; I want to do a simple relay controlled by my nucleo board; so I did a simple circuit with the STP55NF06L; however, it does not work as expeted, in real ife, even when I am not sending voltage to the gate, the transistor conducts electricity, however in the simulation, it works with a similar Transistor, i want to know if this transistor is correct or if I should use another one