Power management

Dear ST office, I have a project with the chip Vipergan50TR.We need the output voltage of 20V/0.2A,  -20V/0.2A,  7V/1.5A. We plan to let the vipergan chip control 20V channel. I tried your online design tool for AC/DC. When i typed in output voltage is 20V, 0.2A for just one channel with the chip Vipergan50TR. It shows me the switching frequency is too low. Please see attachment.Why does this happen, how can we change it? 

HI.I'm looking for this diode so I can change it.I need the order number to buy it.  

where can I get example code for  SPC58EC80E3.   I am trying to give multidevice broadcast command but not working. Attached note for ref. Wether Broadcast init message are correct. Single device messages are as below in network.   0x20 0x24 0x14 0x10 0x34 0x30 0x2C 0x28 0x1C 0x18

Hi, it seems that the STEVAL-WLC38RX uses STSW-WPSTUDIO and the STEVAL-WBC2TX50 uses STEVAL-WBC2TX50. Is it possible to program the STEVAL-WLC38RX to take external ADC measurements via the NTC pin or the GPIOs and send it to the STEVAL-WBC2TX50 using the studios?Please provide some guidance. Thanks!

hello - need to know the assambly plant trace code for lot#  Label Trace codes : GF209402  what plant F stand for  can you please share decoder    

I have a hardware question about the viper53e chip.  For VDD startup voltage, what is the correct voltage to guarantee the mosfet switching will start?  I have seen some examples where 11.5V was not enough, and curious to know what the is the best VDD to use at startup, to guarantee the mosfet will turn on?

I have question about Diagnostic output DIAG1 of L6375S. I measured its behavior when I have open load condition and high VIN+ (when the undervoltage is away). I was changing power supply of integrated circuit from zero to supply voltage , where the undervoltage is out , output mosfet is switch on, and there is output voltage on output (pin2). Voltage for VIN+ input ( pin 7) was realized by divider from supply voltage.I supposed from datasheet  that DIAG1 (pin 5) is low all the time. Diag 1 is low until undervoltage is present and when is not under voltage starts state high input (VIN+) and  open load, this is low too, by datasheet, but I have measured this waveform. 

As in https://community.st.com/t5/power-management/vn5050aj-cs-dis-not-working/m-p/632201#M10745 we now have added seriel diodes for every chip, but it is still not disabling his Current_Sense Output altough the CS_DIS Pin is above 3V.  The CS_DIS-1 Signal is comming from an 74HC138 so there is just always on VN5050 selected. The same principial is working fine on VND5160. Any advice would be appricatied

Hi, We are using STPIN230 Motor driver in our applicationOur BLDC Motor electrical parameters are:1) Rotor inductance - 0.11 mH2) Terminal resistance - 10.7 ΩQueries we have:1) In our current design we have STSPIN230 connected to motor as follows( inductor 10uH  || ferrite bead in series) with BLDC motor windings. Do we need to connect those inductors? If yes, how the value should be selected?Is it necessary,?Do we need Ferrite beads as well?2) Diodes are connected for Back emf protectionKindy list the changes to be done for better operation of motor.Note: Our motor rotates well with this connections.

  Hi,I'm using the STC3100 chip to get the coulomb used from the battery, using the REG_CHARGE_LOW registers,on the new board, I want to move to STC3117, but I don't see this register,Does anyone know how I can get this value? ThanksShamir

We want to develop a USB-C charger and we need to check the battery charge percentage of the device connected to the USB-C charger. The connected to de USB-C device can be a Smartphone, Tablet or PC.In our charger we are going to integrate a processor and we need to read the battery percentage of the device that is being chargedIs it possible to read the battery percentage of the device connected by USB-C? Any ST reference can do this job?

Dear Experts  I am using 2s1p  PA-LNB76-C17UL.4.1.R001 battery, Panasonic NCR18650BF battery for my new application.  Output Voltage - 7.2VCurrent - 3350mAhI would like to know a compatible fuel gauge IC for it. Please pour your suggestions. Kind RegardsDA

Hello,I have developed my own evaluation Board for the STWLC98 Chip. When connecting the power suplly, the DC-Mode, which is on the IC when it is delivered, works in a correct way. But when I want to program the IC with the following firmware from the ST Website: STEVAL-WLC98RX_config_2C00.memhSTEVAL-WLC98RX_nvmpatch_1454.memhI get the following errors, when the programming status bar reaches 100%: Config Id Mismatch! file/chip: 0x2C00/0x1000Wrong config id 0x1000 and patch id 0x0000 for RX Where can I find the right Firmware or do you have any solutions for me?Thank YouSimon

Hi Sir, Could you help share the equation of  ILIMIT and RSET, ILed and RLED?I cannot find the equation in datasheet.Thank you.    

Hello,I use ST's STDRIVE101 in a design to drive a three-phase BLDC motor and used the reference design EVALSTDRIVE101 as a design guideline. My design has a MOSFET switching frequency of 20 kHz and a MOSFET drain-source voltage between 36 and 42 V.I have some questions about the design’s power stage (see screenshot from the design’s documentation below) and would be very grateful for an answer.  All designators mentioned are taken from the screenshot.  My questions are:Gate resistor R11: Is there a strong reason for choosing 33 Ohm? My thinking is tha

Is it possible to program the L6470 MIN_SPEED for a low value, set the acceleration and deceleration to zero and MAX_SPEED to zero to run at the set MIN_SPEED rate?

Posted on December 30, 2017 at 11:16I have a LED2001PHR based LED driver that is designed to drive a string of LEDs at 5.2V and 3A. When I apply power and the LEDs are connected, the LEDs flash for a fraction of a second and then go off telling me that the driver came on and went off again within a very short period of time. When I remove the LEDs (essential open circuit at the load) I see that the driver works again (because I have a small LED indicator on the output). I've attached the eDesign Studio design here. Any idea what seems to be going wrong?#dc-dc-conversion #led-driver

Hello,I have a problem with STGAP2D and the interlock pin.If the interlock pin is on GND, SD and Brake are high, INB is high and the INA is high for 1s after this time 10ms low, than again 1s high and again 10ms low and so on.The output A is only low and the output B is 1s low and the 10ms high.But in the datasheet is written, if the interlock pin is on GND, INA and INB are high, than the outputs also are high.Can anyone tell me, what is wrong?I need this funktion.Thank you and best regardsStefan

If the IC is powered by the battery, how does missing battery detection work ? I am working on a product which will have a USB interface and a single cell Li-Ion battery with charging circuit and a gas gauge. I need to take care of scenarios where the unit is connected over USB to a PC/Laptop but the battery is not connected. How does the firmware (running on an STM32) know that the battery is missing ? 

  Hello, I've designed a PCB with a schematic nearly identical to the STEVAL-WBC86TX. The only modifications are a capacitor and coil size change, which I've also implemented on a development board for direct comparison. On the development board, my receiver PCB performs almost flawlessly, with the only issue being a charging current of around 60mA (which may be unrelated). However, on my new transmitter board, it almost immediately overheats and shuts down. I've attached an image from WPSTUDIO showing the temperature reaching 100°C before shutting down and repeating this cycle. Can anyone suggest potential causes for this issue or point me in the right direction for troubleshooting? Thank you, Mike

Dear Support/Expert I have a question about LED2001, is it practical to apply a relay to switch the LED off, but keep the DIM enabled.  as in the schematic. if K21 is off, it will cut the current off of the output, but the DIM pin of the LED2001 is still enabled. will this operation cause any damage to the chip? or any negative side effect.  Thank you and appreciate your help.David 

I have this design using SPV1040 It uses SM102K06L solar panels, that have Vmpp = 3.35V, Impp = 0.406 A (Pmpp = 1.36W). The output must charge a 4.2 Li-Ion battery. At direct sunlight with one panel, I am measuring 0.39 A, and 1.81 V (voltage measurements in parallel with panel, current measurement in series with panel). Th

Dear Support, This is Lindy From NKG GQA team and I would like to follow up on Case No. 00206525. We would like to understand if there is any update regarding the Smelter CID002645 and CID003470 removal as requested by WD. Could you please provide the update? Below is the previous email that my colleague received for your reference. I am looking forward to hearing from you soon. Thank you!Best Regards,Lindy 

Hello,I am using a STNS01 in my circuit for the power management. The problem is when I only have a charged battery (4.1 v) connected to the BAT pin, it does not switch to the battery voltage. As if the chip is in shutdown mode (I do not know why, the SD pin is internally pulled down and I do not activate it). To release the shutdown mode, I need to connect the IN pin to the USB and when I unplug the USB again, this time it switches to the battery (I think releasing from shutdown).Can anybody let me know why it does not switch to the battery initially? Even I pulled down the IN pin to be sure its voltage is zero compered to the BAT pin voltage (4.1 volt).However, it did not help.I also checked the operating condition table in the datasheet. It is kind of weird for me. Because if the voltage of the battery is in the valid range (3 ~ 4.2 v) it never switches to the battery. I think the table should be modified as below. 

Hi,  I have used following STM reference design for the buck converter. When I power the circuit output doesn't stabilize. What am I missing?   This is from. STEVAL-IHM023V3 Here is my design.