TPS65400: What is the Toff_min spec at switching frequency other than 500kHz?
Part Number:TPS65400Hi, Posting this question on behalf of my customer.There is a Toff_min spec of 150ns, is it only valid for the 500kHz switching frequency?If so what is the value at other...
View ArticleUCD3138: Voice Coil Control
Part Number:UCD3138TI,I've only briefly had the opportunity to look through the datasheet for the UCD3138, but it looks like it might be possible to use the PID loop to setup an inner current control...
View ArticleMOSFET SOA Curves in SMPS Applications?
We are looking for information on, or some knowledgeable in our CSD device physics to talk with, to help us understand when and how to apply FET SOA curves in Switch Mode Power Supply...
View ArticleBQ51003: Receiver coil selection
Part Number:BQ51003Hi,I would like to use a 20 mm diameter receiver coil with bq51003. The transmitter coil I use is WT202030-16M8-G (from TDK with 6.2 uH and 20 mm dia). I looked at TIDA-00318 but...
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UC1875-SP: Figure 1 page 5 duty factor (DF)
Part Number:UC1875-SPI had a question about the below diagram that is part of the UC1875-SP spec. (Figure 1 page 5)The diagram shows duty factor (DF) to be t/T. This would always be 50% for all F....
View ArticleBQ35100: EN Low current is HIGH
Part Number:BQ35100The EN low current that I am measuring with BQ35100 in my design is around 18uA as oppose to 0.05uA as specified in datasheet,I also have bq35100EVM-795 Evaluation Module and it's...
View ArticleLMZ31707: Component Recommendation
Part Number:LMZ31707Hi team,I’m looking for a small footprint, high efficiency and low cost DC/DC converter solution for 1.1V @ 3.75A, 1.5V @2.1A, and 2.5V @1A. I’d derate the 3.75A to 5 or 6A.Input...
View ArticleTPS82140: Soldering issue
Part Number:TPS82140Team, Do you know of any problems with the TPS82140 soldering? Second set of my customers' boards are exhibiting issues, that came down to unsoldered pads or internal connections....
View ArticleLM5176-Q1: Gate resistors and paralleling FETs
Part Number:LM5176-Q1I made a prototype as suggested by WEBENCH, using CSD19534Q5A and CSD18540Q5B and am currently working on a larger design incorporating the power supply. I have two questions...
View ArticleBQ25570: Back power VOUT while programming MSP430 load?
Part Number:BQ25570My system is a BQ25570 powering a MSP430 at 2.6V. The MSP430 is on the regulated VOUT net of the BQ25570 (on the buck step-down). Storage is a supercap on VBAT, charged to max of...
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LM25122-Q1: 12V to 24V boost
Part Number:LM25122-Q1Hi,I have designed a 12V to 24V voltage converter (Iout=4.5A, f(sw)=250KHz) by following all the TI recommendations for this part and the eval board but I have some output...
View ArticleUCD90SEQ64EVM-650: Connecting external I2C Master to UCD90SEQ64EVM-650 PMBUS...
Part Number:UCD90SEQ64EVM-650I am prototyping some MSP430 code to interface with a UCD90120A device via eUSCI_B I2C. I have access to a UCD90SEQ64EVM-650 board with a similar UCD90120A device already...
View ArticleBQ25100: Looking for a battery charger recommendation
Part Number:BQ25100What is the best charger for the following application?Single cell lithium Ion battery:Vin: ~3-4VVout: 30VIout: 5-30mA
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TPS55340: DAC Controlled Boost converter output
Part Number:TPS55340Hi, I'm trying to use the TPS55340PWPR boost converter. I have to use a Li-ion 3.7V single cell battery input for creating a 30.6V output.From my previous post, I have received a...
View ArticleUCC27212: VDD voltage not present
Part Number:UCC27212For the UCC27212: If the VDD is not present, will the top gate and bottom gate output be low or high-Z?Do I need to add pull-down resistors on the MOSFET gates?The datasheet does...
View ArticleTPS61175-Q1: component connected to COMP pin 8 and pcb lay out foot print...
Part Number:TPS61175-Q1Dear TI TeamHere are my 2 questions for TPS61175Q1 IC.1. What is the value of the resistor and capacitor to be connected in series with COMP (pin 8)?2. What is the PCB Layout...
View ArticleLM5045: VIN and VCC
Part Number:LM5045HiMy customer has question.Can the LM5045 be used with the VIN pin open and direct voltage applied to the VCC pin?The customer wants to apply an externally supply 12 V voltage to the...
View ArticleBQ76PL455A-Q1: VREF design
Part Number:BQ76PL455A-Q1Hi:About the VREF pin hardware design, The recommended design is to connect 0.1uF and 1.8uF capacitors in parallel.However, my customer have asked the supplier, 1.8uF...
View ArticleTPS54335A: low-side sinking current-limit
Part Number:TPS54335AHello Shawn sanThank you for your ordinary support.My customer is using TPS54335A for several years, but would you pleaseadvise about following questions?Q1Would you please let me...
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UC3843: How does the RC parameter of the current sampling pin of the UC3843...
Part Number:UC3843Hello:I made a flyback power supply in the same way as the reference circuit of UC3843. The block diagram is similar to the following:In my actual circuit diagram, Rcsf=1k, Ccsf takes...
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