Part Number:UCD3138
i Experts,
I found there is a pulse when supply voltage V33A build up,it's only happened at AD02 , can you tell me why? thanks.
Does it have any side effects?
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UCD3138: Questions of UCD3138 AD02
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TPS92641: adjustable current source design
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BQ25120A: BQ25120A cannot wake up from Ship Mode.
Part Number:BQ25120A
Hi,
I wrote 1 in B5 (Ship Mode) of Register 0. This will enter Ship mode. OK.
However, when I press the MR button, the device will not wake up from Ship Mode.
Even if VIN is connected, it does not wake up.
Here is the circuit
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LM5155-Q1: Does LM5155-Q1 need to use CS pin?
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UCC28780: UCC28780
Part Number:UCC28780
I am doing a lot of recheck of our design schematic/pcb etc... of a product with UCC28780/sync rectifier with all GaN per design guide SLUSD12A
Pl see attached pdf : seems a wire went missing on VCC1 pin of U4 thus U7 also does not get biased.
True?
Also: thanks for updating the xl calculation spreadsheet. There seems to be still some issues...but that is for another post....Maybe happens only for DC-DC case with 380V DC(from PFC) with almost no ripple. If you do consider line ripple, it will be approx 1200 Hz but in theory, it ought to be "0"...There will be some "switching freq ripple"...also small at 100s of KHZ.
-r
(Please visit the site to view this file)
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UCC28780: It seems that a disturber came in
Part Number:UCC28780
Hi, All
But I want the opinion of a transformer expert.
A TI's competitor flyback maker seem to be bringing in a large transformer, saying that QR Flyback alone can deliver 93% efficiency @ 27 W for less understood customers.
But that customer want to make small adapter like 30W GaN Anker.
I want to talk to the customer, "With a small transformer such as the size of a 30W GaN USB PD adapter Anker, an efficiency of 93% can not be achieved with a simple QR Flyback IC."
Does someone have the data such as Transformer sizevsefficiency at QR Flyback?
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LM3424: Maximum duty cycle
Part Number:LM3424
Hello,
My customer are considering LED driver and that has narrow voltage range for between VIN and VOUT.
They want to use buck-mode because it is possible for higher efficiency than boost or buck-boost.
The LM3424 don't show the maximum switching duty on datasheet, Can the LM3424 support 100% switching duty cycle?
Best regards,
Sato
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UCD9090A: Different I2C address case between flash wiring and actually using
Part Number:UCD9090A
Hello,
When the I2C address is different between when writing flash at 3rd party and when actually running on customer’s product, is there any problem?
Regards,
Oba
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bq77915 IC failing with DSG pin shorted to VSS
Part Number:bq77915
We've had a couple of incidents of our bq77915-based battery protection boards failing which we've been unable to explain. The circuit we are using is straight out of the datasheet. I've attached a PDF of the schematic (it is missing a resistor between TS and VTB which has since been added).
On the board that failed, the DSG pin of the IC was internally shorted to VSS. Apart from that the IC was still functional. Providing the IC wasn't trying to drive the DSG pin high it would still power up and operate the CHG pin correctly. When it tries to drive the DSG pin then it draws too much current and the voltage at VDD drops to almost zero (voltage gets dropped across R1 - the series resistor on the VDD pin).
The MOSFETs were tested and found to still be working. There was some damage to the current sense resistor (R14), but it is possible that this was damaged mechanically during the disassembly of the battery pack. The current sense resistor is 1/2W part (Susumu KRL1220E-M-R120-F-T5).
The pack is charged at 300mA maximum. Discharge currents are substantially less (less than 100mA). The cells are 4S NCR18500A. We're not sure exactly of what conditions the board failed under. As far as we can tell it was just during normal operation (no short circuits, overloads, etc). There is also secondary protection external to the pack which prevents the cells from being completely discharged or overcharged.
We've tried to try to reproduce the failure on the bench by testing a range of conditions including shorting the output, over-charging and under-discharging. We've tried testing with the real load, as well as dummy loads with exaggerated inductances. Still, the IC has held up.
Any thoughts on what could produce this type of failure?
(Please visit the site to view this file)
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BQ30Z55DBTR-R3----mass production tool
Dear TI Experts,
My customer need mass production tool of BQ30z55, to flash srec or flash data flash. Could you kindly help to provide? Thanks a lot.
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TPS54625: Output Latch Off Issue When Input Voltage Power Interrupt Test
Part Number:TPS54625
Hi,
My customer is doing power interrupt test, but the output voltage latched-off for some reason. I think this issue is similar to what discussed on the other thread. The input voltage is 12V and the output voltage is 5V.
In his test, it took 8ms after returning input voltage from the time when output voltage goes below 65%. He tried 8.2nF, 100nF, 470nF SS capacitors as suggested in the thread, but it didn't work for all cases. Could you please help me solve this issue?
Best regards,
Itoh
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Questions of LM3481
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Details of transformer T7
Part Number:UCC28950
Hi,
I want to know details about shim inductor transformer T7.
Do you have any datasheet or details like
core type:(is it PQ2020)
material used?
Regards
Nidheesh
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TPS23880: Does pass the sifos test?
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UCC28070: Question about overvoltage function for PFC output
Part Number: UCC28070
One customer is evaluating pin to pin short test, but test result was NG because PFC output became overvoltage and Electric capacitor open valve.
Please let me know about three points below for over voltage protection;
Reference circuit is attached below;
①When either RA or RB occur open or short for any accident, is there any protection circuit?
（It is NG for Cout open valve）
②When either RA or RB occur open or short for any accident, I think that Vvsense voltage is not increase (start OVP).
Is there OVP function for PFC output side?(the other than VSENSE pin's OVP)
③Is there any protection function in the condition of pin to pin short testing?
※Above tests are need to request the safety standard.
Best regards,
Satoshi
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TINA/Spice/LM5170-Q1: LM5170 mathcad calculation file
Part Number: LM5170-Q1
Tool/software: TINA-TI or Spice Models
HI
Does TI release Mathcad file of LM5170?
Michael
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UCC3895: CS pin Input Circuit Bandwidth (Amplifier and output RC)
Part Number: UCC3895
Hello Team,
UCC3895 CS internally has a op amp circuit and RC filter.
May I know if there is bandwidth information of the op amp circuit and the value of the RC filter?
Thank you.
Regards,
Ting
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BQ25710: Counter plan for ISL9241 (Hybrid Power Buck-Boost)
Part Number: BQ25710
When the condition of high current on 4-cell buck-boost charger, ISL9241 is higher efficiency than bq25710.
I think that Hybrid Power Buck-Boost (HPBB) is matched high current condition.
Is there any idea for improve efficiency?
For example, external component for bq25710 (NVDC) , Roadmap for TI's HPBB, etc.
https://www.renesas.com/jp/ja/www/doc/datasheet/isl9241.pdf
Best regards,
Satoshi
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TPS40210 : External sync timing requirements
Hi team,
Is there any timing requirement when the TPS40210 is used with the external clock sync ?
Normally, there should be specifications for the pulldown/pullup pulse minimum timing.
Thanks in advance for your support.
Regards,
Pol
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Qi compliant LiFePO4 charger IC
Hello,
I'm looking for a Qi compliant LiFePO4 charger IC.
Is there any chip that can do this?
Thank you for your feed back
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