Part Number: LMR14050 I am designing a PSU PCB with 3 different rails, but I’m unsure where to position the layouts for each of the 3 rails for best results. Up the top are 3 black lines representing the rails that the external devices will draw their current from. I want to have the components and most circuitry on the top layer, and the bottom layer reserved for a universal ground plane. Rail 1: +12V @ 3A - LMR14050 - large output current - Needs to be low noise - doesn’t add a large amount of switching noise to rail Rail 2 +5V @ 1A - LMR14050 - low output current - can be higher noise - doesn’t add a large amount of switching noise to rail Rail 3 -12V @ 1.5A (buck-boost-inverter) - TPS54540 - large switching current - needs to be low noise (preferably same as +12V) - Has a larger amount of switching noise on rail due to BBI design. Some restrictions: - position of output rails, power input and board size/shape can not be changed. - Board is limited to 2 layers. - all components must be on the top layer So my Question is: Where should I position each rail for lowest noise on the +/-12V rails? (considering that the +15V power and ground inputs are on the bottom left of the PCB)
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Forum post: LMR14050: multi rail PSU layout placement
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Forum post: RE: BQ79606A-Q1: Problem waking it up for the first time
Good morning Taylor, We are a group of students and currently we can't not afford your EVM, so is there any other method in order to identify if it is a hardware issue? Also, is there any pin that should pull high or low when the BQ79606A-Q1 is active, so we can actually see if we have acheived it? Thanks, Alex
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Forum post: RE: UCC29950: The output driver GD1 and GD2 are not working if they are clamped
Hi Robert, Sorry to hear that this did not work out for you on this occasion. Best of luck with your new solution. Regards Peter
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Forum post: eFuse roadmap
Dear all, I would like to ask about future eFuse road map. Our customers are looking for a device that meets the following conditions: Are there any plans to release devices that meet this criteria in future roadmaps? Input: 30V LimitCurrent: 10A Functions: Overvoltage protection, overcurrent protection, reverse polarity protection (used for UPS protection) Best Regards, Y.Ottey
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Forum post: RE: TPS62063: Minimum current flow before entering power save mode
Hello, you can have a look at the efficiency curves for your Vin and Vout. There is a local minimum (like a cusp point) and at this point you can see the load current, this is the value where the device enter in PSM. I attached here an example.
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Forum post: RE: LM5021: Is there any limitation for cap value on SS pin?
Masa-san Below are answers to your questions Q1: There is no set maximum value for capacitance on SS pin Q2: You are correct, to disable skip cycle all you have to do is set an offset voltage of at least 125mV as Figure 12 (page 15) of the LM5021 datasheet shows. Best Regards, Eric
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Forum post: RE: UCC28740: Is it possible extend the HV pin range upto 1KV by adding series resistors ?
Harshal First off I'd like to recommend considering our SSR flyback controller UCC28742. It's very similar to UCC28740, except it uses a resistor for startup. Since no high voltage is directly applied to this IC it is straightforward to scale it to support 1kW input. For UCC28740, you are correct that if you clamp the voltage on the HV pin you can use it with higher voltage inputs. You can either use a resistor, followed by a zener clamp to limit the voltage seen on HV pin to below 700V, or if you have a stacked capacitor on the input you can connect the HV pin to the mid point, allowing the voltage the HV pin sees to be half of the input voltage. Best Regards, Eric
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Forum post: SOH monitoring of a "LG Energy 18650 Li-Ion Battery" when it is disconnected from the circuit
Hello, I'm asking for a solution to track the battery SOH. But in my special application, the battery will be disconnected from all the circuitry when discharging. So the battery management IC and Fuel gauge will be connected to the battery only when charging. I can't find any solution for this application even I do not know if it exists or if it is possible. Can you please recommend me any solution? Thanks in advance, Julian
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Forum post: RE: BQ78Z100: Wrong register readings
Hi Kang, I sent you the srec file via email. Could you please check? Best Regards, Caglar
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Forum post: TPS7B63-Q1: LTSpice model
Part Number: TPS7B63-Q1 Hello, my customer with which we have an NDA tried to run a simulation on LTSpice with the PSpice model of the TPS63-Q1 (TPS6350-Q1); unfortunately he got an error message saying "too few nodes". It seems like this model is encrypted for PSpice only. Is it possible to provide an unencrypted model of this device that can run on LTSpice? Note: we have an NDA with this customer. Best regards, Stani
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Forum post: RE: BQ24002: BQ24002 input current
Yes, Input current to VCC pin is 1mA maximum.
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Forum post: RE: UC2845: Cost effective controller to generate 50% duty 300K to 500K output
Hi Peter, They implement like below: Now, they like to know if they can replace UC2845 with tl2845 directly here? By changing RC, they'd like to output PWM at 500K, will that be okay? Thanks Sheldon
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Forum post: RE: TPS51200: How to calculate the VO voltage
Hi ChienChung, Can you check the latest datasheet online? In latest datasheet, R1 is 3.86k and R2 is 10k. Thanks Qian
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Forum post: RE: TPS2421-1: Parallel connection of TPS2421-1
Hi Rakesh. I tried using the individual RSET resistors and my device began to work correctly. We will buy in the nearest time TPS259827LEVM: Evaluation Module for TPS259827L eFuse and trying this chip. G reat thanks for help.
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Forum post: RE: BQ40Z50-R2: FCC drop to 0 when charging after low temperature
Thanks for your quick answer Steven ! - Smoothing is enabled - True Full Chg Q and True Rem Q are not at 0, at least during charge. I don't know yet when the FCC drop which values they have I'll try to have a log, but it's not easy as I have to access to I2C bus in the device; I'll try. Issue is replicable, as soon as I put at this temp and charge it it goes like this. In our application, its is possible to have intermittent connection / multiple connections during a charge cycle. Is that an issue ? After charging during some time, if I reset the BQ40Z50, the FCC recover and the device finish charging. I have to do a reset if the battery stop on Over Charge, in this case FCC does not recover as charge is stopped by OC safety. I did not try the R3 version. I would like to solve this issue quickly with the R2 if I can, or specific improvement have been made to the R3 than can help ?
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Forum post: RE: BQ24610: The schematic is as follows, Protection appears as soon as power is turned on，why?
Hi Gary, What do you mean by protection is turned on? Is charger indicating a fault condition? If so please check status of STAT1 and STAT2 and verify against Table 2. STAT Pin definition for BQ2461x in d.s on page 22. Verify test results with the charge state column.
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Forum post: RE: BQ34Z100-G1: review CHEM-ID
Hi The full charge capacity differs too much to actual capacity, please try to set the Qmax and design capacity close the actual value so that the learning would succeed
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Forum post: BQ34Z100-G1: Connecting/disconnecting battery from the IC
Part Number: BQ34Z100-G1 Hello, I was looking for a solution to a Li-Ion battery SOH monitoring but in my particular application, the two batteries will be galvanically isolated from all circuitry when discharging and will be connected again when charging. I do not know if the SOH value read with the BQ34Z100-G1 after charging will have any accurate or not and I can't answer it from the datasheet. I will be using a 3350mAh LG Energy 18650 Li-Ion Battery. Thanks in advance, Julian.
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Forum post: RE: UCD3138: UCD3138 JTAG usage, after once JTAG is disabled
I know it will be if you clear the bit in IOMUX. I suspect that even if the PWM is mapped to the TCK pin the output will still also appear on the PWM0 pin, but I’m not sure. If you want to know, just check.
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Forum post: TPS61280A: Can TI burn the values of the two registers in the TPS61280A ROM before shipment
Part Number: TPS61280A Hi Team, Can TI burn the values of the two registers in the TPS61280A ROM before shipment? CONFIG Register [0x1] MODE_CTRL[1:0] set to "1 0" in TI EEPROM 10: Forced PWM operation. VOUTROOFSET Register [0x3] default set to "0x1F" in TI EEPROM
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