Part Number: TPS54525
Hi team,
I want to use this device as below, Vin=5V, Vo=3.3V, Io=5A; if I connect 3000uF in the output, will it have any bad impact? Thanks.
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TPS54525: output capacitor consult
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UCD90120A: watchdog timeout
Part Number: UCD90120A
Hello Team,
We are using a UCD90120A Power Sequencer in a design that was found to have an issue in qualification.
We are using both the older version and the newer version of the tool.
We are trying to use the watchdog feature.
It does not appear that we have the capability to do anything with the triggered watchdog but toggle an IO.
We would really like to hook up the watchdog timeout to a resequence event?
(Without having to add a wire to the design)
Please advise,
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LM5143-Q1: LM5143Q1 in parallel and Output 12V 50A
Part Number: LM5143-Q1
Dear Ti expert:
my customer have a car power supply project, non-isolated step-down DC/DC power supply, input 15~60V , output 12V/50A, need to recommend a suitable solution.
In addition, it is necessary to add the NMOS tube control output at the output terminal, and there is no control IC recommendation.
In addition, it is necessary to add the NMOS tube control output at the output terminal, and there is no control IC recommendation.
Can LM5143Q1 Out1 and out2 connect in parallel , and output 12V 50A？
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TPS7A87: TPS7A87 Thermal Temp
Part Number: TPS7A87
Dear TI Team,
When calculating the thermal temp for the TPS7A87, do I need to calculate the sum of power for out1 / 2?
Or should I calculate the higher of the two outputs?
Thanks.
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Recommended Zener Diode for BQ25619
Hi,
What is the suitable/recommended Zener Diode to be connected to VBUS pin for charging chip BQ25619?
Thanks
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TPS65218D0: TPS65218D0 and LP87332D for i.MX8M Mini processor.
Part Number: TPS65218D0
Hi Team,
TPS65218D0 and LP87332D for i.MX8M Mini processor solution see link
How can this design be implemented and can be recommended to customers?
Are they ready for design?
Are there also complete design materials or test reports available?
thanks
Kevin
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TPS2372: confirm dual signature class resistor selection ON TPS2372
Part Number: TPS2372
Hi team:
Customer side set TPS2372 PD in dual signature, how is the classification table will be? Is it same as single signature's?
Attachment is the latest schematic, could you kindly help review it, please?(Both TI TPS2372 and NXP KL02)
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LP8861-Q1: Excel Calculator
Part Number: LP8861-Q1
Hi,
Good day.
Our customer is looking for the excel calculator for calculating the component values for a specific NTC and target thermal profile as stated in the datasheet.
We would appreciate if you could share it with us.
Thank you and have a great day.
Regards,
Cedrick
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TPS2372-4EVM-006: TPS2372-4 software problem
Part Number: TPS2372-4EVM-006
Hi, Hello
as discussion, we understanded that single signature class 0~8 could be implement by class resistor selection as below table in TPS2372 chip.
Please help to confirm dual signature class resistor selection inTPS2372 are as same as single signature. (class 1~class 5).
(Please visit the site to view this file)
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WEBENCH® Tools/TLV61220: Output voltage "sagging" with 30-40 mA load
Part Number: TLV61220
Tool/software: WEBENCH® Design Tools
Hi my question is a lot like this one: https://e2e.ti.com/support/power-management/f/196/t/660545?tisearch=e2e-sitesearch&keymatch=tlv61220 which is marked Resolved but the solution isn't shown there.
I want to boost 2.7V - 4.5V up to 5.5V, at current of 30-40mA.
At, say, 4.1VIN, and with no load, the TLV61220's output is 5.5V as expected. But when we connect our load (30-40 mA), VOUT "sags" down to 4.7V.
I've tried a larger inductor (soldered in 2 of the L2 inductors in series).
WeBench simulation seems to suggest that I should get 5.47 VOUT, even at as low as 2.7 VIN, and even with up to 50 mV of load.
My R11 and C14 can probably be ignored--they're there to give me a way to solder in an RC filter if needed, and are unpopulated (R11 has a trace connecting its pads, which I cut if I need to solder a resistor to the pads)
Please advise!
Thanks!
Ethan
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TPS23753A: TPS23753AEVM-004 based design runaway
Part Number: TPS23753A
Hi--
We have a new prototype design with a PoE front end essentially copied from the TPS23753AEVM-004. When powered from a RTN referenced supply at 36V (this is all we have tried so far), the converter output rises immediately to >6V. If we clamp the output at 3.6V, over 10W is delivered to the load. We can power the downstream load (~3W, 3.3V) with the actual eval board itself with no issues. The primary differences between the eval system and our design are:
- Layout
- Optocoupler is Broadcom ACPL-217-50AE
- Shunt Reference is TLV431AFTA (3-pin, Diodes, Inc.)
- MURA120 diodes replaced by other GP diode types
I've attached a schematic page if anyone is interested in looking. The TPS55340 boost regulator shown has been isolated by removing D5 and LB1. For test purposes, the 36V supply is connected at the cathode pad of D5. It looks a lot like we are not regulating at all. I'll try to capture some 'scope traces at key points and attach tomorrow. Anyway, if anyone has any suggestions about where to start looking for issues, we'd be very appreciative.
--Matt
(Please visit the site to view this file)
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LM5145: LM5145 ripple terrible
Part Number: LM5145
I would like to ask that the LM5145 to do a positive 15V voltage conversion into output voltage negative 5.5V voltage( a DAC to adjust ), at the current 1A output, the output waveform is terrible, may I ask what is wrong.
Adding Attachments:photos of schematic and output waveforms, layout screenshot
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TPS7A89: datasheet psrr has error?
Part Number: TPS7A89
the picture show as:
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UC2842A: What is the dropout voltage of internal reference voltage
Part Number: UC2842A
Hi Team,
My customer would like to know what is the min. VCC voltage that can keep VREF stay at 5V output?
Thanks a lot.
Vincent Chen
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TL432B-Q1: Build LDO with TL432, high output ripple
Part Number: TL432B-Q1
Hi expert,
My customer build LDO with TL432 in their automotive application and has ripple issue.
1. Test condition
(1) Build LDO circuity as shown in figure one
Figure 1
(2)Vin=6~7V, Vo=5V, Iout = 0~300mA
(3) R1=R2=Rfb, Imin=1 mA。
(4)NPN transistor has below characteristics
Figure 3
(5)Vin is supplied with DC source and digital load is in CC mode
2. Problem in testing
During testing, we fund different load condition and input voltage will cause large variation in output ripple. When decrease the resistance value of R3, output ripple becoming even larger. When empty load, Vout is 5V and no output ripple. Output ripple seems increase with load current. But, when load goes to heavy, ripple will drop again.
3. Testing results
(R1=R2=1k; R3=500Ω, CC load)
Vin/V | Io/A | Vo/V | ΔVo/mV |
6 | 0.1 | 4.98 | 92 |
6.5 | 0.1 | 4.97 | 265 |
0.3 | 4.95 | 200 | |
7 | 0.1 | 5.00 | 311 |
0.3 | 4.94 | 415 |
PS: Vo are all measured on digital load, actual LDO output is 0.01 to 0.02V high thean measured.
(R1=R2=1k; R3=333Ω, CC load)
Vin/V | Io/A | Vo/V | ΔVo/mV |
6 | 0.1 | 4.98 | 146 |
6.5 | 0.1 | 4.99 | 285 |
0.3 | 4.94 | 366 | |
7 | 0.1 | 5.00 | 313 |
0.3 | 4.96 | 499 |
PS: Vo are all measured on digital load, actual LDO output is 0.01 to 0.02V high thean measured.
(R1=R2=1k; R3=200Ω, CC load)
Vin/V | Io/A | Vo/V | ΔVo/mV |
6 | 0.1 | 4.97 | 226 |
6.5 | 0.1 | 5.00 | 301 |
0.3 | 4.95 | 467 | |
7 | 0.1 | 4.97 | 226 |
0.3 | 4.97 | 87 |
PS: Vo are all measured on digital load, actual LDO output is 0.01 to 0.02V high thean measured.
One waveform sample:
R1=R2=1k; R3=500Ω; Vin=6.5V, Io=0.1A; ΔVo=265mV
Thanks!
Sheldon
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UCD90320: Resetting device to factory default / unexpected random enabling of rails
Part Number: UCD90320
Dear Forum
I have this strange behavior of the UCD90320, that DURING initial programming after shipping, the rails are enabled unexpectedly and in random order!!! This is absolutely shocking to me since the sequencer is used to orchestrate 28 rails that have very strict requirements for sequencing!!! I am not sure if the damaged FPGA (6000 US$!!!) we encountered lately is due to this erratic behavior!
Now I wanted to find out if I can make some sort of a "dummy"-Config that is first written to the device before programming the final configuration. This dummy-config can hopefully be defined in a way to prevent the device from going mental during programming of the final config. In your guide "Configuration Programming of UCD Devices" from 2010(!!!) on page 30 you describe this exact method by using the provided function "Clear Configuration" from the "Tools" tab. Unfortunately, this tab is no longer available in Fusion designer 7.1.1. How can this "factory reset" be done with the latest tools?
Maybe someone has a tip for me how to prevent the UCD90320 from randomly enabling the rails by applying another trick?
BTW: No, all enable inputs at the power converters we use are active high, so this can't be the reason for the observed behavior!
Regards
Fabian
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UCC28070: FINAL REVIEW 15 AUG 19 2300
Part Number: UCC28070
I AM REQUESTING FINAL REVIEW OD WAVEFORMS AND ASSOCIATED VOLTAGES.
FINAL REVIEW IS IN THE BELOW LINK. THAN YOU FOR YOUR TIME AND GUIDANCE.
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TPS2069: UL Listed and CB-File No. E169910 mentioned in datasheet
Part Number: TPS2069
pls help to send UL certification and CB-File No. E169910 to my mail: jerry-Xiao@ti.com
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LM2576HV: LM2576HVS-15 date code?
Part Number: LM2576HV
Hello. Help please.
LM2576HVS-15 on the first line National semiconductor logo next 85A2M4UE3
The question is what year of manufacture? and shouldn't the logo be TI?
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BQ25703A: BQ25703 abnomal
Part Number: BQ25703A
Hi
1. Output voltage is 12.23v when DC input is 11-13v;
- VDD =VREG =6V
- CELL_BATPRESZ =3.8V；
- ILIM_HIZ = 2.8V;
2. When adjusting the input of 5~11V, the input current keeps jumping and cannot be stabilized.
And the sound of "drip drip drip drip";
3. Adjust CELL_BATPRESZ voltage divider, the output does not change;
Please suggest how to troubleshoot.
Thanks
Star
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