Part Number: UCC2808A-2Q1
Hi,
Supply Voltage is15.5V, is that ok?
Thanks!
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UCC2808A-2Q1: VCC ABSOLUTE MAXIMUM RATINGS
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LM3478: Unstable PWM-signal in boost design, part 2
Part Number: LM3478
Hi!
Vacation is over and I have now done some measurements related to the original question (which was locked).
Vin=3.5V
Ch1, yellow, 5V/div: Gate of M1, used for triggering (during this measure, a 22Ohm resistor was connected between DR and the gate)
Ch2, green, 50mV/div: Isense pin
Ch3, red, 2V/div: Drain of M1
Ch4, blue, 50mV/div and 1.35V offset: Comp pin
Oscilloscope BW = 500MHz
Zoom on short pulse:
There are glitches on Isense and Comp (partly due to bad probing I guess...), but as far as I can see, they come after DR switches off.
The same glitches can be seen on the correct pulse, with same relation to DR goes low:
As I mentioned in the original question, for this test I have used a separate supply for the LM3478 Vin-pin only. For the scope shot above, both supplies were 3.5V. If I change the LM3478 supply to 3.6V (keeping 3.5V to L1), there will be no short pulses.
Any idea why I get this short pulses?
BR
/P-O
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TPS65154: max channel current and paralleling channels
Part Number: TPS65154
Hello team,
I was wondering if it is possible to put all the channels in parallel? I am not able to access the single LED chains of my LCD..
Additionally, there seems to be a discrepancy between the typical application (where 50mA is configured per channel) and the electrical characteristics (Ifb max 40mA). Does this mean 40mA is the max current?
Thanks
Mat
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LM5007: Calculator Problem
Part Number: LM5007
We follow the datasheet's equation and below conditions, we can get the result of the Cin that is 0.34uF by datasheet 8.2.2.8
Iout(max)=0.26A，D=0.5，Fsw=380kHz，deltaVcin=0.5V
Cin=3.42*10e-7=0.34uF
However, when we download the calculator tool(LM5007QickStartCalculator) and the calculated result is 3.4uF. Please help to clarify which is correct one? Very thanks.
(Please visit the site to view this file)
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LM3478: Drawing excessive current when loaded
Part Number: LM3478
Hi all
My problem is probably caused by a very silly issue, however at the moment I cannot see it. I hope someone out there can help.
As a company we have previously used the LM3478 - i.e. it layed out on a previous PCB.
We needed a new boost supply based on the same chip but with different input, output and current requirements.
I designed this on with Webench. The resultant design had the same connection layout as what was implemented on the previous PCB. I therefore, as a first step implemented the changes in components to get the required output voltage and current. This worked.
I then moved the design to a new PCB which I have fabricated. Component values are the same, but I have changed some of the components for space reasons.
When I test the board unloaded, I can see the programmed voltage on the output. Probing the drive signal, I can see the programmed switching frequency.
When I load the board with either 30 or 60 ohms, the bench power supply I am using current limits and the voltage collapses. The power supply is set to 17 V and the current limit at 3 A (the bench PSU's limit). The design is for an output of 37 V at up to 1 A with an input range between 8 ad 25 V.
I know it is not much information to go on, but does anyone have any idea why when loaded the system starts to draw more current than expected.
I will be unable to share the actual schematic or PCB layout, but I may be able to upload the Webench output, which in essence is the same.
Any help would be appreciated.
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WEBENCH® Tools/TPS715AXXEVM-065: Solar cell output regulation
Part Number: TPS715AXXEVM-065
Tool/software: WEBENCH® Design Tools
I need to provide around 3.3V to a bluetooth , reception/transmission beacon, from a parallel, solar cell and 3.6V (recharcheable) battery, input. The beacon draws 0-6 ma (1s on/1s off), and the solar cell output varies 0-5.5V (to recharge the battery when possible). Low quiescent current is important. Is this the best LDO to evaluate, or can you recommend alternatives?
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BQ40Z80: Polling speed of the BQ40Z80
Part Number: BQ40Z80
Hi there,
I was wondering what the lowest polling time for the BQ40Z80 chip is?
I am currently evaluating the BQ40Z80 chip for my company, and we are thinking of migrating from the BQ34z100-G1 chip to the BQ40Z80 Chip.
Our current BQ34Z100-G1 chip can only be polled every 500ms which is painfully slow and no longer suitable for our applications.
Does the BQ40Z80 chip have a faster polling rate? if so what is the new time?
Thank you
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BQ25570: VOut_EN_P6 tied to VSTOR?
Part Number: BQ25570
Hi Folks,
I'm trying to troubleshoot a 3rd party's board that uses bq25570 and a solar cell to charge a lithium battery....
I'm comparing their design with a reference design LES100 (BlueTooth Indoor Solar Dev Kit). The ref design has VOut_EN tied to VBAT_OK.
The 3rd party has it VOut_En tied to VSTOR.
Are both acceptable?
Note, we are in the last stages of pre-production and if we can get the charging working correctly we can move to production.
thanks,
Bob S.
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TPS7H1101A-SP: bode plot measurement
Part Number: TPS7H1101A-SP
Team,
In section 8.1.1 of the datasheet there is a mention of the inner loop. I want to know more detail(s) on how TI was able to measure the inner loop? What we are looking is for the crossing frequency and compare the outer and inner crossing frequency. If you can provide what tools you use and measuring points to connect the Bode plot that be great.
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TPS62110-HT: Need to know the availability of this part in the die form.
Part Number: TPS62110-HT
I am trying to use this part in my design. Is there a die available for this part? Where can I buy this par ? Also, you have specified the TPS62112-HT. Is this part also available? Can I get the die for this part.
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BQ76940: Strange frequency noise of bq76940 with bq78350-R1
Part Number: BQ76940
I have BMS design using bq78350-R1 + bq76940, LFP 15S configuration.
I have observed strange frequency noise from the cell at top and bottom of each ADC bank of bq76940.
such as CELL #5, CELL #6, CELL #10, CELL #11 only,
Not on CELL #1 or CELL #15 or others,
Noise level is various some channel is 30~50mV, some channel up to 200mV.
I have attached some graphs,
Can I get any advice about such a problem ?
Thanks
P/S : I have designed similar with EVM design from TI
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TPS63030: Adjustable output with DAC
Part Number: TPS63030
Hello Support team,
I could find the application note below at TI.com product folder of TPS63030.
Dynamically Adjustable Output Using the TPS63000
Is it possilbe to support adjustable output with external dac by TPS63030?
We expect to adjust Vout from 3.5V to 5.5V at Vin=5V. Is it possilble?
If you have some concirns, please let me know.
Best Regards,
Hiroakzu Takahashi
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BQ34Z100-G1: Basic parameters spreadsheet?
Part Number: BQ34Z100-G1
Hello,
Matt Sunna shared a useful spreadsheet in order to get started with the BQ34110 device (ref https://e2e.ti.com/support/power-management/f/196/t/793491?BQ34110-Help-in-Configuring-Basic-Gauge-Parameters).
Please, may I know if there are similar resources for the BQ34Z100-G1?
Thanks
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CSD97394Q4M: 100% duty cycle operation
Part Number: CSD97394Q4M
Hello,
We would like to use 2 of the CSD97394Q4M with the bq25713 battery charger.
However we need to be able to operate at 100% duty cycle.
Is it possible to provide an isolated voltage on the boot pin to do this? (perhaps using the SN6501)
If so, what is the minimum voltage acceptable?
Thank you, Keith
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BQ76PL455A-Q1: EM1402EVM and SN74AHC595
Part Number: BQ76PL455A-Q1
Hi
I am using the EM1402EVM and the example control software that TI provides.
I was wondering if RCLK on the SN74AHC595 must be toggled or the line can be left high to still ensure the data is clocked in. It appears to be left high in the example code.
Also with respect to the SN74AHC595 it states, in the datasheet I have, that fmax has to be a minimum of 85MHz. Does that mean that the RCLK and SRCLK have to operate at a minimum of 85MHz. This is far from the frequency that the sample software would be able to clock the data in.
Just wanted to get clarification
Thanks,
Malcolm
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TPS65150: Capacitor Value Consolidation
Part Number: TPS65150
Hello,
Could you look over these modifications I made to the typical application diagram? A customer would like to reuse the low cost capacitors already in their library, as opposed to having several different capacitors of slightly different values as suggested in the diagram.
The only obvious change we see is that adjusting C11 and C12 will increase the start up time from about 1ms to 2ms. Is there any issue with this?
Thank you!
Thank you!
Regards,
Ryan B.
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BQ24640: Difference between BQ24640 and other normal chargers
Part Number: BQ24640
Hi,
I wish to know the difference between the BQ24640, which is a charger particularly for the super-cap and other normal chargers. Does BQ24640 have any special function?
Best Regards
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TPS65295: please help to review the design, BOM difference
Part Number: TPS65295
Hi，
This is the first usage of TPS65295 in my customer. comparing to TPS65295EVM-079schematic, I just can see a few difference on the BOM. please kindly give your professional advice. thanks.
(Please visit the site to view this file)
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LM27966: LM27966 Linux driver
Part Number: LM27966
Hi
Is there a linux driver for LM27966 that we can use?
Please check it.
Thank you.
Best regards
From Anthony.
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TPS1663: TPS16630 Low Current Shutdown Control
Part Number: TPS1663
Hi,
I'm designing a PCB based on TPS16630REG IC.
My requirements are
Input and output Voltage - 5V
Input and output Current - 5A
My question is how to connect Low Current Shutdown Control Pin (TPS16630 Evaluation board connect this pin to button). Is it OK if I leave Low Current Shutdown Control pin as a floating?.
regards,
Vijan
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