Power management

I am looking if there are any usage and layout examples for the STWLC38JRM as a 15W receiver. Thank you so much!

Hello everyone    I'm working on a student project with an STM35H563RIT6 and a Power over Ethernet (PoE) supply. I'm currently validating my design, but, reading the datasheet of the PM8805TR to do PoE, I just see the output current (max 2A) but no voltage (except VOB everywhere in the datasheet without any really data on it).   Did I passed over it without seeing the information ? Or are there any calculation to identify the output voltage ?    Thanks in advance for your answer Kind regards Sappherien

Hi; i was trying to connect my eval-l9963e-mcu to an arduino uno, to comunicate by SPI. How can i do this? 

This is our first board design that uses the STP16CPC26. We have two chips daisy-chained together. The SDO output from the first chip never goes high. The SDO pin is definitely not shorted to ground or any other net, and is definitely connected to the SDI pin of the daisy-chained downstream chip. If the chip is properly powered, the SDI pin is held high, and clocks are applied to the CLK pin, is there any reason why the SDO pin would not go high?

My apologies if this is the wrong ST forum... it seemed like the closest one to the part I'm using.I have a new STM32F072 board design that has a STP16CPC26 LED driver connected to one of SPI busses. I just could not get the chip to do anything using the SPI bus, so I switched to a dirt-simple bit-banged (temporary, throw-away) driver so that I could easily change any aspect of the timing to make the chip work. Same problem... no matter what I do none of the outputs ever turn on and the SDO output stays low all the time. I've used a DMM to ensure it's properly connected to power and ground and that the supply voltage is okay (it's at 3.3V). I've had 3 other embedded developers look at the scope traces of the SDI, CLK, LE and OE- signals and they all agree that the timing and sequencing matches what the datasheet says you have to do to make the part work, but... it acts like it's dead. I've tried 5 different boards, and none of the outputs on any of them ever change state. I've

I want help to understand this. The STM MOS FET STP6NK60ZFP has a MAX gate-source voltage (Vgs) at 30V. In order to protect it from ESD it has a built-in TVS diode. Over 30V it can fail. But the bulit-in TVS has breakdown voltage (Vbr) set at 30V. It's when it begins to conduct. The clamping voltage (Vcl) is a couple of volts more. It's when it conducts fully. But then it's over the limit 30V. More voltage than that can make the MOS FET fail. Shouldn't it be that the Vcl should be 30V so an ESD can't exceed 30V? Or is it really enough with Vbr at 30V and Vcl some volts more? Se table below.  

Hi ST Community! I'm working in a HV power design (400VDC) with a STPSC6H065DLF Schottky diode. I can see from its datasheet that pins 1 and 2 are not connected internally, but I can't find any recommendation about what to do with those pins. Would it be safe to connect them to the Anode? I'd like to attach a copper plane to them, for improving thermal disipation, but in the other hand I don't want to have a floating copper plane in that area, since it's a switching one.   Any recommendation or suggestion will be welcome.   Thanks in advance.   Juli

can PG pin of ST1L08SPU33R be left floating if unused?Datasheet does not specify it.  

Hi all,I was wondering if there is any pin to pin replacement for VN920SP-E?VN920SP-E is obsolete now, and one of our main products needs this to function.Any help would be appreciated. 

Dears, I'm working on an audio project, and I'm searching for LED drivers with no PWM, to avoid noise. I need one sink (common anode LEDs) and one 'voltage' (common cathode LEDs) driver.  Could you please suggest two  drivers, which could comply with the following requirements please ? - I2C interface to microcontroller - no PWM, this is important - SSOP or DIP form factor, if possible - Sink driver: 8 channels, 50mA (for the RGB LEDs and two backlight leds as well) - 'Voltage' driver: 4 channels, 50mA - Power supply of the MPU will be 3.15V, hence logic levels will be accordingly   Thank you very much in advance ! Cheers Matteo

Could you tell me the minimum DC current gain(hFE) for the BUF420AW？

Hello,I have designed the same schematics of the website : The output should be 18V and no significative current (1-5mA output because MCU off). I have tested the input voltage at [80 ; 200] V and I have the same problem. The chip try to start during 400ns and stop during 1sec.I can confirm there is no problem on the output because I have checked the output.The transformer is a wurth : 7508111324The transformer parameter is : 

Dear  ST team ,   We are currently finalizing our hardware design using the L9678P, with a focus only on deployment functionality and functional safety compliance according to IEC 61508.   I’ve gone through the datasheet and functional descriptions in detail — I’d like to summarize the key points I’ve understood and kindly request your confirmation on the following items. Our use case does not include external sensors (i.e., no sensor data read in Safing State), and we are not using the Remote Sensor Interface  and  ISO9141 features.   Pins Required for MCU Connection Below is the list of pins we believe must be connected to the MCU for SPI communication, control logic, arming, and optional monitoring: Pin Function

Hi ST communityi just searched the setup of VN1048F then found out there are two evaluation board(EV-VN1048F and EVSPC582B).In this user manual of EV-VN1048F, it said this EV-SPC582B is supposed to be programed as described EV-SPC582B user manual. so i just moved to UM2897 but could not find any information of that programming.i noticed this programming is the key to setup the EV-VN1048F...Regards

Hi all, I am interested in the SPSB081, it is fully compliant to ISO 11898-2. Where can I download the ISO 11898-2 

I am trying to produce a triac power controller for a large mains solenoid which is for a lab demonstration of electromagnetic induction.  I have not had much success!My initial attempt used a simple 2-wire design as shown in figure 1 of ST's AN308 application note. I found often got power glitches supplied to the solenoid at power-on even with the power control pot turned down to minimum (maximum-resistance, well below the triac's normal triggering threshold). I believe this was due to the highly inductive nature of the solenoid. I also have a 100W mains bulb paralleled across the solenoid to confirm the presence of the glitches with a flash.My second attempt was to try the 3-wire circuit shown in figure 4 of AN308, which is recommended for inductive loads, where the triac is triggered by the main voltage rather than the voltage across the load (solenoid). The problem is the power/voltage delivery as a function of pot rotation is no longer smooth.  At a cert

Hi everyone,  i am strugglig for a while trying to bring vn9e30f 24bit spi high side driver to life. Don't you know about any "sample" software which shows exact way how to change (for example on channel 0) duty cycle on given channel ? I tried almost anything. On O-scope with SPI decoding, everything looks fine(watchdog toggling, parity....) i guess, but i am still not getting any output. (i am using EV-VN9E30F evaluation board SDI connected to MOSI, SDO to MISO, providing PWM freq etc...)     I attached my sample code.   Thanks for your response.   Jan

HelloI want to use 3 x STSPIN220 for controlling 3 x stepper motors (motorized lens: Zoom, Iris, Focus). Currently to test lens I want with X-NUCLEO-IHM06A1 evaluation boards (with NUCLEO-F401RE). In stm32_nucleo_expansion_boards_motor_control_selection_guide.pdf mentioned that up to 2 x X-NUCLEO-IHM06A1 are stackable.It is not clear for me how I can do it and to control movement of at least 2 lens (of 3) separately? Thank you in advanceAlex

Dear Sir/Madam,we are designing a PFC input stage for a power converter.  High efficiency, low power loss, and low EMI (low dv/dt, low di/dt) are all important requirements.  We have identified a suitable power topology for this stage: Zero-Voltage-Transition (ZVT) boost, operating in CCM for most of the AC cycle for mid to high load power. This topology requires the following components:1. Two (2) controlled power switches: the main boost switch, and an auxiliary switch to control the current in the auxiliary path that sets up ZVT/ZCT for the main power switch (and the main power diode).2. Passive and non-controlled components for the auxiliary current path: inductors, capacitors, diodes.3. A control IC that can provide all the control and protection functions, and the gate drive to both the main switch, and the auxiliary switch.The UC2855A (and UC2855B) from Unitrode (now TI) seems to be a good candidate for item 3. 

Hello,We want use sixpack SiC Power MOSFET module for drive a low power hi voltage motor.For safety reson I want measure the phase currents with 3 shunts connected beetween low side source and negative, instead one. With this package aren't avalable the power low side sources pin, but only signal low side sources (S2 pin 22, S4 pin 26 and S6 pin 30).Are there some issue, other than noise and voltage drop, like low section wire bonding, about use signal low side sources for connect the shunts leaving negative (pin 1-2) disconnected?Thancks   

Hi Community,I designed and developed a board for STUSB4500. I followed the schematic as mentioned in the STEVAL-ISC005V1 schematic diagrams, however I used only the main circuitry surrounding STUSB4500. There is no particular guidelines for layout, so I assume that is not the problem. Even in the main circuitry I only used only one output and not connected PowerOK2 and PowerOK3 pins rather given only test points just in case. I have attached the schematic for your reference. NOR Gate, BMS Shutdown switch, Button Operation LDO and Timer components can be ignored as there is no interconnection between PD controller and these components.When i'm connecting type C input, the VBUS_VS_DISCH pin is reading 5V and the gate pin of Power MosFETs are at 0.6V and i'm not getting output. The voltage reading at VBUS is 5V. Also in the STEVAL-ISC005V1 schematic, the VSYS pin is connected to 3V3 of Voltage regulator. So I have added an LDO in schematic but haven't so

I am using STWBC2-HP and STWLC99 for development. The output voltage at the receiver end is set to 10V, and the current limit at the transmitter end is set to 5A. However, the actual current at the transmitter end can only reach a maximum of 0.8A, and I do not know why.

Hi.My project adopts stef01 chip  for LED driver,I am meeting an odd phenomenon without thermal protection/overcurrent protection(I think),EN/Fault pin sometime is 1.4V,sometime it works well.It can be recurred when i rest the en/fault pin(efuse_rst=L) with normal temperature---28.5 degree(can i regard it as no thermal protection?) as one of two timing:1) Time1  --- a short period of time2) Time2  --- time of duration until reset en/fault pinIt's not always like this.My question:What can cause the problem?Thank you,Ricky

Hi, I bought the eval-l9963e-mcu, I want to know if I can use with SPC5 Studio, cause when i open the software and select L9963E it doesn't work. There is someone who already used this board?

Hello. I am reading the specification for L99DZ70XP and have some doubts about figure 3 in Section 2.4.1: There are two comparators in the figure used to monitor whether the ECV status is not reached/too high and input the comparison result into the register. I want to know if the registers controlled by these two comparators are bits 0 and 1 in table31 of Section 5.7: ECV voltage too high and ECV voltage not reached? Furthermore, whether the thresholds of the two comparators for determining the ECV voltage are given by programming as described in table31? If the threshold is determined by programming, could you provide or inform us where to download the software routine for reference? If my understanding is wrong, please point out my mistake. Thank you