Part Number: LP5562 When LP5562 is operating at standard mode(<100KHz) The rise time / fall time can follow UM10204 standard mode spec ? For example 1. Rise time for SCL\SDA measurement result is 18.56ns. < 1000ns -- meet standard mode critria 2. Fall time for SCL\SDA measurement result is 9ns. <300ns -- meet standard mode critria
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Forum Post: LP5562: I2C standard mode rise/fall time spec
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Forum Post: TPS65320D-Q1: Switching frequency control.
Part Number: TPS65320D-Q1 Hi, I would like to create "dithering" by adjusting the BUCK switching frequency from external source ( MCU) . Will the BUCK stay stable while changing its switching frequency dynamically ? What is the minimal time interval between two changes ? Thanks, Ofer
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Forum Post: LM79: -15V output 3-terminal regulator (TO-220) which can support in minus temperature range
Part Number: LM79 Hello experts, I'm looking for 3-terminal regulator (TO-220) with fixed -15V output. LM7915 looks good, but operating temperature range is little bit narrow. I need the device which can support in minus temperature range. Do you have any other suggestion? Thanks and best regards, Ryo Akashi
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Forum Post: TPS65094: how does push-button circuit connect without EC
Part Number: TPS65094 Dear Sir, We are now using TPS650940 as PMIC and TPS51285B as BUCK for Intel APL-I and without EC . The BUCK have 2 always-on rails, VREG3 and VREG5 and we use VREG3 only. The PMIC have 2 always-on rails, LDO5P0 and LDO3P3, not used. The Power of Push-Button circuit is VREG3 and the output of Push-Button circuit is 'CTRL'. Should we connect 'CTRL' to enable pin of BUCK or enable pin of PMIC ? The attach file is our block circuit.Thanks! (Please visit the site to view this file)
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Forum Post: UCC28951-Q1: Magnetization support
Part Number: UCC28951-Q1 Hi Experts, We add 66uF capacitor on the primary side of transformer to prevent the magnetization. The magnetic flux density is 150mT but it looks the transformer is saturated. Does UCC28951 compensate the magnetization? Regards, Uchikoshi
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Forum Post: TPS92515HV: PWM frequency and UVLO (Part2)
Part Number: TPS92515HV Hello, we still have some issue with the proposed solution. To avoid any misunderstanding can you point me the proposed boot circuit that replaces the circuit in Figure 25 ( http://www.ti.com/lit/ds/symlink/tps92515.pdf ). Is there any chance to get a drawn circuit? Thanks and Regards, Daniele
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Forum Post: TPS23880: I2C connection through I2C switch
Part Number: TPS23880 Hi Team, Our customer plan to connect three TPS23880 through an I2C switch(PCA9548), is this has any side effect? Or anything needs to be careful? Thank you very much, C.T.
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Forum Post: LM5150-Q1: Duty cycle limit at cycle-by-cycle current limit in start-stop mode
Part Number: LM5150-Q1 Hello team, My customer want to know how much the duty cycle was limitted or decreased when entering the cycle-by-cycle current limit in the start-stop configuration. Please expalin how to operate the the cycle-by-cycle current limit of LM5150-Q1including calculation. Best regards, DY
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Forum Post: LM5106: LM5106: erratic switching, killing MOSFETs
Part Number: LM5106 Hi, I need to reopen an older case, as we found that the problem that is described there actually still exists. The old topic is: https://e2e.ti.com/support/power-management/f/196/p/722620/2667359
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Forum Post: LMG1210EVM-012: -200V operation
Part Number: LMG1210EVM-012 If I give -200V at input i.e. V(HS) will be -200 and PGND will be connected to GND. In this case I will need to remove the bootstrap diode and give V(BST) from an external isolated supply 1)What should the value of V(BST) be?From datasheet 5V should be fine 2)Can V(BST) be continuous of should I control it externally so that it turns on when low side driver is on? 3)If I need to switch V(BST) externally can I use the LO output signal to control a FET? 4)What are the other ways of controlling V(BST)?
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Forum Post: LMR33620: Validating design BOM
Part Number: LMR33620 Hello, I have chosen the following parts for the LMR33630ADDAR ‑ 6V-30V to 3.30V @ 2A design: Cin: GRT31CC8YA106KE01L, Cinx: 810-C3216X7R2A224K, Cvcc: 810-CGA3E2X5R1A105MA, Cboot: 963-HMK212B7104KG-T, L1: 652-SRR1240-150M, Cout: 81-GRM31CC80J476KE8L (quantity 1), Coutx: 810-CGA3E2X5R1A105MA. Unfortunately my design is not starting up and I would be pleased if you could take a look at the parts to check if they are fine. I'm trying to figure out what went wrong. Kind regards, Michal
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Forum Post: BQ20Z75-V160: Is there any UL report for this device ?
Part Number: BQ20Z75-V160 Dear all Is there any UL report for this device ? Or other certification report ? Certification of any aspect. Please share to me the reports, or certificate number, Thanks a lot. My email: went.cao@wpi-group.com
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Forum Post: BQ24075T: bq2407xT Input current transitions
Part Number: BQ24075T When trying to transition from input current of 500mA to 1500mA (transition form 10 to 01 is simultaneous) , the input current changes trough either 100mA or 0mA. This causes problem when the battery is absent. This causes the system to reset. Is there a work around?
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Forum Post: BQ25713: Switcher not starting - SYS_SHORT bit set
Part Number: BQ25713 Hello TI power forum, I'm testing a design based on the BQ25713 and have noticed that occasionally when cycling the power (VBUS) that the switcher will not start up but VSYS stays just over 1V and the SYS_SHORT bit is set. I've tried but cannot reproduce this behavior on the EVM module. We've stayed very close to the EVM reference design so I'm not too sure what is causing this issue. If I manually clear the SYS_SHORT bit then the switcher will immediately start-up. Some additional observations. With the EV2400 connected and battery management studio open and monitoring the BQ25713 registers I notice that the SYS_SHORT bit actually gets set on a power down event (only sometimes). If I then turn power on immediately it will be stuck on a SYS_SHORT and power cycling will not help unless I power down long enough for the capacitance to drain and SYS_SHORT bit resets (about 5 seconds). Any idea as to why this is occurring?? This seems to happen in about every 1 in 10 power downs and will only really manifest itself if I power up right away while the SYS_SHORT bit is set. Thanks, Dan C.
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Forum Post: BQEVSW: bqevsw with ev2400 not read data flash
Part Number: BQEVSW Hello. I have ev2400 , trying to raise the battery after a full discharge from the macbook a1502 on the controller bg20z45 v7.02. When I try to read the data flash program gives an error reading Data Flash Subclass Voltage, Code = 772
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Forum Post: TPS54620: SS/TR being pulled low before PG falling?
Part Number: TPS54620 For the TPS54620 what are the conditions which would cause SS/TR to be pulled low prior to PG? The SS/TR pin is connected to a voltage divider which remains steady during this event. The divider voltage at SS/TR is 1.5V. Thanks, Allen
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Forum Post: TPS65131-Q1: Radiated EMC issue
Part Number: TPS65131-Q1 Dear team, My customer use this device, when they tested the radiated EMC, it failed. Vin=5V, Vout1=10V, Vout2=-10V, Ioad current=10mA. The 1.44M frequency point exceeded the standard in the EMC test radiation emission. Through the testing with near field probe, it is determined to be generated by the 65131 circuit, the waveform of the negative phase power switch has a spike on the oscilloscope. The RC snubber circuit is added, but the result didn't improve. Can you help to provide an operational correction or solution to this frequency? When testing the EMC, the customer changed 0ohm resistors to magnetic beads; When using the near field probe to test the waveform, the customer also did some changes as below, 1. Increase the load at the positive and negative output terminals respectively, and the resistor is changed from 1k to three 1k in parallel; 2. Change 2 inductors from 4.7uH to 6.8uH (TDK: SPM5030T-5R6M-HZ); 3. Positive and negative outputs are respectively connected in parallel with 560pF capacitors; 4. Add snubber circuit in parallel with the negative direction diode, is 20R, 680pF; The switching frequency is 1.38MHz. The EMC test result is as below, SW waveform(L=4.7uH) SW waveform(L=6.8uH) negative phase output noise near filed probe test the schematic is as below, the layout is six-layer, the first top layer is as below, Thanks & Best Regards, Sherry
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Forum Post: LM340: LM340MP-5.0 Input Voltage Range
Part Number: LM340 Hi, The datasheet for this part recommends operating with 7.5V < Vin < 20V. Does anyone have any experience running this off higher voltage rails? I'm looking to use something around +25V or even up to 30V. What effect could this have on the operating characteristics? Thanks
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Forum Post: BQ2962: BQ2962 OUT-pin
Part Number: BQ2962 Hi TI, i have a question to the OUT-Pin of the BQ2962 . If an undervoltage condition at one of the connected battery cells happens, switches the OUT-Pin to High? Or only by an overvoltage condition? This is not clearly documented in the datasheet. In the block diagram an page 12 is a trigger shown by charging/discharge. On page 20 in the application curves is no trigger to the OUT-Pin shown. In my application it works in undervoltage condition too. What is right? Thanks for your answer. Thomas Golitz
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Forum Post: Recommended railway power supply scheme
Dear all : I have the following power scheme requirements Input voltage：DC-160V Output voltage：(1) DC-24V;(2) DC-48 V Output power：100W PCBA size：1/2 brick, 1/4 brick each provide one solution, can be the same solution Please recommend a low-cost solution? Thank you!
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