Part Number: TPS2549-Q1
Hi team,
Can you answer the following questions?
In the condition of AP(CPU) – TPS2549-Q1 – USB Connector <= Harness/cable => PC,
-. Can you explain how TPS2549-Q1 works from a host/slave/OTG perspectives?
AP Host :
AP Slave/OTG:
-. When using AP update/download mode via the USB path from PC, how does TPS2549-Q1 work?
Thanks,
Sam Lee
Part Number: UCC28950
Hi,
Could you tell me about UCC28950 switching operation?
Is UCC28950 able to turn on "OUTA and OUTD" / "OUTB and OUTC" at the same time?
Customer wants to know if this device can perform hard switching operation.
Please tell me the concern and problems related to this usage.
Best Regards,
Yusuke
Part Number: ULQ2003A
Hi Team,
Please help me answer the follow question from my customer, thank you so much.
Please tell me about ULQ2003A rising time and falling time under the following conditions.
[Condition] Input:0-5V pulse (rising and falling time are not considered)
Output:load resistance (about 1kΩ)
Best Regards,
Tom Liu
Part Number: BQ76PL455A-Q1
Hi,
We followed EVM circuit to build ~ 20 pcs of PCB. Among them we see some PCB got failure in wakeup.
The symptom is that when pull WAKEUP pin high, it does not wake up the BQ76PL455A-Q1 and also we see abnormal high current 80mA~140mA.
Which portion of the circuit should we improve ?
Thanks!
Part Number: BQ79606A-Q1
Hello,
I’m designing an optical transceiver for the BQ79606’s COMM Daisy Chain Bus and would like to ask a few questions regarding the use of the BQ79606 as an electrical interface chip.
simplified illustration: 
Is it possible to configure the BQ79606 in a way that it only functions as an interface chip without participating (listening / responding to the data) on the bus? Ideally the BQ79606 would behave completely transparently so no changes to an existing bus would be needed when an optical transceiver is added.
As an alternative to using the BQ79606, does TI offer a dedicated interface IC for the COMM Bus?
Best Regards
Achim
Part Number: LM61440-Q1
HI,
There are two questions for Rboot.
How can the Rboot pin by pass the Cboot pin,when the boot capacitor dischare?
Why need the boot diode?Is it for reverse voltage protection?
Very appreciate for answering the question!
Edward Chang(Please visit the site to view this file)
Part Number: TPS62160EVM-627
Dear,
our client test TPS62160EVM-627, and we operating condition:
VIN:6V
Vout:3.3V
Iout:0.08A
and We measurement EVM TP1 waveform as below chart, is normal?
2. measurement EVM TP1 waveform as below chart , is normal?
3. spec waveform
If any suggestion, Please advise me.
Thanks,
Best regards,
Lawrence.
Part Number: BQ25886
Hi,
Stumbled upon this IC for an application I'm currently developing. I'm having a hard time understanding if there really is a undervoltage protection or not. I.E VBAT falls to 6V or less. Does the specified transistor Q4 cut off the supply to protect the battery?
The feature I'm looking for is briefly mention in section 8.3.2 and 8.3.6.3, but its refering to UVLO threshold (VBAT_UVLO_RISING), a variable that dsn't seem to be declared anywhere in the datasheet.
Could you confirm that the IC indeed does cut off supply if battery falls below X voltage?
BR
Linus
Part Number: TPS23758
Hi team,
We would like to know how to recognize type and class from PD side.
Based on basics document, I knew that PSE and PD is classified once PoE is handshaking.
We want to use power limit by PD side once PD knows PSE is not supporting required power.
Best Regards, Naoki Yada
Part Number: BQ500511
Hi Team,
For the BQ500511 LED display function,
How to deal with LED_A, LED_B, LED_C and LED_MODE if we don't use it? Floating?
Hi Sir,
May I learn from you do we have suitable solution can replace ADP8866A?
Thank you for your kindly help.
Edward Chen
Part Number: TPS61022EVM-034
HI
We modify the EVM for 3 ~ 4.1V input and output 4.26V, however the efficiency is not good, can you help review our circuit ?
Below is our test result
Part Number: LM3410
Tool/software: WEBENCH® Design Tools
Part Number: UC1834-SP
Datasheet for the UC1834-SP mentions the Fault Alert Output current as 2-5 mA. Request confirmation that this is the maximum output sink current of this section.
Thanks
Nandha
Part Number: BQ78350-R1
Tool/software: WEBENCH® Design Tools
sir,once connected we got the outputs and we gave a RESET command from command window,from then our operation has stopped.its showing that the device is sealed. the manufacturing status is 0x0030.how could we bring it to normal state.
entered unseal_full_access and unseal key also in manufacturer access but of no use.
AFE BQ76940, host BQ78350_R1
Part Number: TLC59208F
Dear Team,
Do we have TLC59208F in four-port version?
The customer wants a similar firmware.
BR
Kevin
Part Number: UC2843AQ
Dear team,
please support on following:
tested UC2843AQ and preparing the schematics with "startup Circuite".
We have following question:
How to implement a faster start up time but keep power dissipation LOW on Rstart? Especially at high voltage (110V)
We have the idea to use voltage stabilisation(insteat Rstart) with one NPN transistor which wil be active only at start up.
Maybe you have some additional ideas?
Thanks
Part Number: TPS2121
Dear Community,
I've been design power multiplexer for my circuit, using TPS2121, IN1 is primary source power by Li-ion battery range from 2.8-4.2V
IN2 is power by 5V auxilary source.
My purpose is when IN1 or IN2 is presented, output will be one. When IN2 is applied while IN1 is still present, the transition from lower to higher is perfect, no problem.
But when IN2 is disconnected while IN1 is still present (transition from higher to lower source), I issue that there is a drop on the output voltage (up to 2V as in Oscilloscope), as it drop to 2V, then back to 2.8V.
This cause my circuit turn off during drop out. As in the datasheet, the TPS2121 is said to be fast switch over between 2 source (up to 5us).
The topology im using is higher voltage operation (VCOMP) and it is said the switch over time tsw = 100us.
But the measure result show 550us switch over time.
In fact, I must say that if the transition between 2 source is not seamless, the drop voltage could cause my device to turn off during this time.
I've add 1 more 100uF 6.3V capacitor on the output of TPS2121 but the result the same.
Is there any recommend or other solution for hot-plugin/plug-out or immediately transition between 2 source multiplexer.
I notice the TPS25942 could be use for hot-swap controller, but the datasheet said it still has switch over time.
I need a solution could help me switch with 0 switch over time, or should i try the fast switch of TPS2121
Thanks.
Part Number: BQ4050EVM-561
Hi, I'm using BQstudio to monitor a battery. I have a few problems.
1) BQstudio is reading that the full charge capacity is 4400 mAh, my actual battery capacity (2S) is somewhere between 5000 and 6000 mAh. How can I update the full charge capacity? I tried completely discharging the battery, but it didn't change.
2) The temperature read by BQstudio is -273.2 C. How is this possible? how to update it? I tried enabling all thermistors, but it didn't change.
3) Does the BQ4050 normalize the capacity of the battery according to the value in Full Charge Capacity register?
Respectfully,
Elkhouly
Part Number: UCC28780
Can UCC28780 be used for passive clamped flyback converter? I've tried to use this controller in a passive clamped flyback circuit. I'm not connecting the PWMH pin to anywhere. In the space of HS GaN FET, I'm using a superfast diode. Otherwise, the schematic is just the same (except the snubber resistor in parallel with the clamp capacitor; its value is 12k in my schematic) as given in the reference design TIDA-01622.
I'm more interested in learning the control strategy of the ACF controller in this configuration. What I found is that at Vin=325V, Vout=15V, Iout=3.15A, PWML isn't coming at the first valley of switching node always.(Please visit the site to view this file) I'm attaching the waveform here. What's the cause of this? I can understand that as ZVS isn't happening now the control strategy of ACF (UCC28780) won't be applied here. Then how does the controller decide when to provide the PWML (or turn on the primary FET) signal?
