Power management

The STM6905 datasheet says in Table 2 that there is an internal 10k pull-up on RST#, which seems wrong since that's an open-drain output. Then in Section 2.6 and in Section 3 it says that an external pull-up to VCC should be used.

Hi everyone, I'm working on a prototype, which is using a PM8805 to classify connected PoE types. However we are running into an issue, where neither T0, T1 or T2 are giving us any signals (giving always 1 on their open drain signals, making .the LEDs stay off). Suspecting an issue with our prototype, we went on to get a STEVAL-POE001V1, which is showing the same scenario: With our different PoE, PoE+ and PoE++ injectors (Both Ubiquity and TP-Link brand), the T0, T1 and T2 LEDs are remaining off. The PGD LED is however on in those tests. We tested with and without a load on the output (for example 5kOhm) to prevent the injectors going into standby mode. We checked and according to datasheets the TP-Link TL-POE160S is an active 802.3af/at compliant injector. Is my understanding correct? With the CLS 1 resistor at 36.5Ohm and the CLS2 resistor at 51.1Ohm, the T0, T1 and T2 signals should, as an example, be 0, 1, 1 respectively for a

Hello,We are currently looking ahead at future options for stepper-motor control and are interested in ST’s longer-term direction beyond L6470 and powerSTEP01.For our application, sensorless detection of stall, obstruction/collision, and increased friction/load during motion is important. We have also looked at Trinamic TMC devices, which seem to offer more advanced sensorless feedback, but we would prefer to stay with ST if a suitable future device is planned.Is there any newer stepper-driver IC on the ST roadmap intended to improve sensorless load, back-EMF, stall, or obstruction detection compared with L6470 / powerSTEP01?And if such a device is planned, is it something expected in the near-to-medium term?Thank you.

Hi all,Hoping this is this right subsection to post the following question...I'm reading the STPD01 datasheet and it states its available I2C addresses : 4, 5, 6, and 7.Reading to general I2C documentation, it seems that these addresses are reserved to I2C HS-Mode. So, is STPD01 an HS-Mode controller or a regular (100kHz) device? Links:- https://www.ti.com/content/dam/videos/external-videos/en-us/8/3816841626001/6241024036001.mp4/subassets/adcs-introduction-to-i2c-reserved-addresses-presentation.pdf- https://i2cdevices.org/addresses- https://en.wikipedia.org/wiki/I2C- https://learn.adafruit.com/i2c-addresses/the-list

Hi ST team,We are going to design variable programable power supply based on PFC + half bridge PWM controller (with fixed transformer turns ratio). Below is the requirementFor Model 1 Vout (Half bridge converter): 3V-63V/5A (180W maximum with auto ranging)For Model 2 Vout (Half bridge converter): 3V-23V/20A (210W maximum with auto ranging)PFC output wattage for one channel model: 230WPFC wattage for second channel model: 460W So could you please suggest can we use the L6563 for PFC and L6591 for our voltage and power application as mentioned above. RegardsVikram

Hello,In the STPMIC datasheet, the BSTOUT continous current  is specified as being greater than 1.1 A when 3.3 V < VIn < 5.5 V.If the voltage Vin is greater than 4.5 V, does the  BSTOUT continous current  increase?I assume so, since the inductor's peak current limit (IBSTLIM) is 3.3 A and the short-circuit current (IBSTSH) is 4 A, but could you confirm this for me?If so, what is the BSTOUT continous current  when Vin>4.5 V?Best Regards.Sylvain 

The Tsample value doesn't reach the published value (between 0.3 and 0.5 s, and from my measurements between 0.3 and 0.35 s) until Vstore reaches the EOC threshold. Before, it is just around 80 ms. Once EOC is reached and when Vstore decreases again the published range is achieved, but when Vstore decreases below the UVP threshold, the value of 80 ms shows again and it keeps until the EOC threshold is reached again. I tested this with 2 different chips. This behaviour is not stated in the datasheet.

Hi ST team,We are going to use L6598D PWM controller (Half bridge topology) followed by PFC IC L4985B for our variable power supply design.We need two models for variable (programable) power supply (Model 1 & Model 2) as below specifications. So, can we generate below mentioned wide output voltage from IC L6598D with Half bridge topology?For Model 1 Vout: 3V-63V/5A (80W maximum with auto ranging)For Model 2 Vout: 3V-23V/20A (80W maximum with auto ranging)  RegardsVikram

Hi, We are currently using the parts listed below and would like to confirm if they are reflow compatible. We plan to use a paste-in-hole (pin-in-paste) process for these through-hole components during SMT assembly. Could you please advise if the following parts can withstand this process: 1) VNP35N07-E2) VNP49N04-E3) VNP35NV04-E Thank youJay Trivedi

Hi Engineer， Based on the data sheet, the marking of STH145N8F7-2AG should be "145N8F7 ", but the parts I purchased were with marking of "145N8F7-2". Could you help suggest whether I purchased correct parts? Thanks, Haddy

Hello,I am currently working with the STEVAL-L99615C evaluation kit and the Nucleo G071RB microcontroller board. My goal is to set up a LabVIEW program that can:1. Adjust the output voltages of power supplies to simulate real battery cells.2. Read data measured by the evaluation kit (e.g., cell voltages). For this, I need to learn the basics of communication with the evaluation kit, such as reading and writing to registers (e.g., reading VCELL1_MEAS from register 0x04).Steps Taken So Far1. I successfully connected the evaluation kit to the provided STSW-L99615C GUI, and it works as expected for executing scripts and reading data.2. I attempted manual serial communication with the Nucleo G071RB using PuTTY:Port Settings:Baud Rate: 9600 (also tried 115200)Data Bits: 8Parity: NoneStop Bits: 1Flow Control: NoneCommands Attempted:READ 0x04READ 4READ 4\nREAD 0x04\n  However, I did not receive any response from the board in PuTTY. Additionally, I observed that my keystrokes wer

My name is Jeongsoo Lee. We are using the L9961 (BMS IC) and have configured the circuit using the L99615C development board to establish a basic framework. However, our battery solution requires a 3-series configuration. The datasheet and development report guide connecting from cell 1, but there is no information on handling the remaining cell 4 and 5 pins. I also have additional questions regarding whether the entire circuit ground should be connected to C0. Our specific questions are: Should the C4 and C5 pins be left floating, or should they be grounded?Should the entire ground of the BMS IC and MCU be connected based on C0? When debugging our BMS board based on the L99615C circuit (5 cells to 3 cells) using the STSW-L9961BMS code, we are encountering an issue where Cells 1 to 3 are read in reverse order. Is this expected behavior? When applying 3V to Cells 1 to 3 using a cell simulation device, the measured voltage differs from the actual voltage. Th

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Hello,is it possible to cascade multible STPM33 Chips? That means SPTM33 + Crystal as master -> two STPM33 CLKIN-> Last CLKOUT -> two STPM33 CLKIN 

Good Evening,I am a student doing a capstone project, and I have been having a massive headache with the STUSB4500 PD negotiator. I am using it to pull 15V at 3A from a power brick so I may power a handheld device downstream. We utilized a recommended layout from the datasheet itself so that we may program it ourselves. Attached below.The good news is, it can sustain loads and power our project... but the bad news is these chips have up and died about as randomly as a carnival prize goldfish, attached are pictures of my layout and schematic for this section of the board. Apologies for any amateurish mistakes on schematic labelling and layouts.  The trouble is that we can program the chip, and it stays stable for a long while. But out of nowhere, three times now, we will go to plug the board in one day, and the chip will be dead. I believe the chip to be dead since it no longer tries to negotiate the preset 15V like we wanted, the 2V7 and 1V2 lines are seemingly dead, and

Hello. I need to find this component. Thank you 

Hello everyone,​I am designing a USB-C Sink-only application (5V/3A) using a standard STM32 MCU. My power architecture is as follows:​Input: USB-C Connector (VBUS, CC1, CC2).​Protection: TCPP01-M12 controlling an external N-channel MOSFET on the high side of VBUS.​Regulation: A 3.3V LDO is connected downstream of the MOSFET.​Supply: The 3.3V output from the LDO powers the MCU and the VCC/DB pins of the TCPP01-M12.​The Constraints:​The MCU's internal UCPD peripheral is not used (pins are allocated to other functions).​The system must rely entirely on the autonomous hardware logic of the TCPP01-M12 for the initial power-up.​The "Zero-VCC" Paradox:I have a technical question regarding the Dead Battery startup sequence. When the system is first connected to a charger and is completely unpowered:​VCC of the TCPP01-M12 is strictly 0V because the LDO hasn't started yet (the MOSFET is still open).​DB pin is also at 0V.​My Questions:​Internal Powering: How does the TCPP01-M12 energize its inter

Cross to Diodes Inc PN: SDM40E20LC-7 with long life cycle for new design.  

Hi,We are looking for recommendations on a suitable topology and charge controller for charging a LiFePO₄ battery with the following requirements:Input voltage: 9–36 VDCOutput voltage: 10–36 VDCOutput current: up to 80 AWe understand that a single IC may not support this current level, so we are considering a parallel architecture using multiple controllers. Kindly suggest an appropriate approach and suitable IC options.Thanks,BK

Hello, We are looking for suitable drivers for L9396. Got only the Datasheet & a WSS Operation document. Can you help with the SPI Driver ?   Regards, Prakash B J

We are currently evaluating the following STMicroelectronics IC for our application:SPV1040TTRAs part of our reliability and performance assessment, we kindly request your support in providing:Temperature vs. efficiency curves across the specified operating temperature rangeMTBF (Mean Time Between Failures) data or estimated MTBF hours for the above-mentioned ICs

I have a component on a board that I am trying to identify.It showsST logoBGVGP244I'm hoping someone can help with this.  I included a pic in hopes that will help.Regards,Curtis

I'm using eFuse STEF05D, found 2 version of the datasheet below which show the different formulas:STEF05_en.DM00034383,pdf: R-Limit = 65/IshortSTEF05D.pdf: R-Limit = 42/IshortCan someone help clarify which formula is correct? 

Hi all,I am using the STUSB4500 to power a device with a large inrush current. I have configured the PDO's for 20V @5A which should be more than sufficient to meet the power requirements.  I have selected POWER_ONLY_ABOVE_5V so that it will not attempt to power the device at 5V (which would draw 4 times as much current). See my settings below:  However, when I connect a 100W USB-C PD adapter to the circuit I see the chip first negotiate 5V before switching to 20V. I think that is expected but what I did not expect is the VBUS_EN_SNK to pass through the 5V. I believe this is causing the overcurrent protection to trip on the USB adapter (after a short delay) so we see the power turn off shortly after the switch to 20V. In the below scope trace the yellow is VBUS and the cyan trace is VSink (see  schematic attached).   Has anyone run into this issue?  Any idea what I might be doing wrong?Let me know if I can provide any more details. Best regar

i am using viper 22A. having three outputs. one output is regulated and other two are non regulated.I am having below problems1. i keep fan load of 120mA, output is regulated but as soon as i connect other load , all voltages dips including regulated ones.2. if i add more load on regulated winding, my voltage drops on regulated ones.3. if i increase grid voltage beyond 210v, ic enters into some kind of protection. it turns on and off. i have attached the transformer  and circuit diagram.It will be very helpful if anybody could help