Part Number: BQ78350-R1
sir i have used bqstudio software in bq78350r1 in this i used the shut down command how i come back to this command any procedure or any instruction is available to me. and sir the seal mode and shut down mode function is same are any difference between them.
Part Number: TPS56628
I am using TPS56628 buck convertor in my design for 5V to 3.3V conversion. But in the webbench its showing as this design cannot be performed. Please let me know the reason
Part Number: TPS53319
Hello expert,
Customer connect TPS53319 VREG to hardware sequence. When it is powered on, there is drop on VREG. May I know if it is a risk for TPS53319? Thanks a lot!
Part Number: TPS61088
Hi
Part Number: LM3489
Hi
Part Number: TPS562208
Hello guys,
One of my customers is going to evaluate TPS562208 for next their products.
They have a question as the follow. Could you please give me your comment?
Q. Why is R3 resistor(10.0kohm) inserted on EN signal line as Figure 19 on page 12 of the device datasheet?
Is the resistor mandatory?
Your reply would be appreciated.
Best regards,
Kazuya.
Part Number: LM337L
Dear Sir or Madam
As debugging the circuit related to LM337L , I found that the output voltage didn't meet the result it should be according to the equation of the datasheet .
While , here is my schematics .
R29 wasn't mounted in the board . As tested , the port MIX_VIN is about 11.8 Volts .
But unexpectedly , the TRG_PLIM port was about 2.6 Volts , which was not correct and should be about 3.3 volts .
After replacing the R30 with a 1.37Kohm resistor , the TRG_PLIM port was about 3.0 Volts ,which should be 3.4Volts according to the equation .
Therefore , would you mind to give me some tips that if I missed something or did some thing inappropriate in my design ?
Kind regards
Anglic
Part Number: BQ24157
Hi Sir
The measure waveform, may we check as below questions with you?
The questions as below:
2. Suppose that in the case of 3Cell, if each Cell is fully charged at 4.2V, does Vin need a higher value than the output (Ex: 12.6V)?? How much voltage does Vin need to output higher than?
How much voltage should I add if needed? Is there a relationship??
Bogey
(Please visit the site to view this file)
Part Number: BQ25100
Hello,
Customer wants to use 230mAh battery without NTC thermistor.
And wants to make enable and disable function by using TS pin.
Can BQ25100 be enabled and disabled by TS pin?
If possible, could you let me know how can make it?
Regards,
Nicky
Part Number: BQ78350-R1
Dear Team,
I want to unseal bq78350-R1 with I2C/SNBus from my uC, not with bqStudio.
But at first, I tried to send the SMBus command from "Advanced Comm SMB" of bqStudio with following order, but I could not complete.
1) Write Word : Command = 04, Word = 14 (Success)
2) Write Word : Command = 36, Word = 72 (Error)
Also I tried this, but it seems not fine.
3) Write Word : Command = ff, Word = ff (Error)
I want to program my uC with refering the SMBus waveform of bqStudio.
Could you teach me the right way ?
Regards,
Makoto Teramoto
Part Number: LM5175
Dear Sir,
could you help review our schematic for attached file.
please let me know that your advisement.
please refer below spec.
Input : DC12V ~ 30Vdc
Output: 14.6Vdc, 20A(max)
(Please visit the site to view this file)
Part Number: LM25118
Hi
Thank you for your help
My customer ask some tech questions , they use the LM25118 for converting 26V to 28V.
At first , they take off the output mosfet and want to test the HO/LO drive wave , then they found there is no output at Ho/Lo pin. I told them to test the VCC pin and found the VCC is 3.5V , I think the device is in the UVLO state , I told them to connect the VCCX with 12V . then the Vcc become 12V . then they can test the Ho/Lo output wave . But after they plant the mosfet , the Vout become 2.8V , and FB pin voltage is not 1.2V , nearly 0V. Here is the schematic.
Do you have any ideas?
BR,
Leon.liu
Part Number: UCC24624
Hi Tiers:
i used the UCC28180+L6599+UCC24624 in my 480W AC/DC project.
When the AC input turn ON/OFF(ON 1s---OFF 1s---ON 1s), i found the UCC24624 will latch the SR drives(One of the two)
The parameters of UCC24624 follow the EVM.
Do you have any good suggestions to solve this problem, thx
Part Number: UCD3138
OK, here is the case. I have used a UCD3138A in a three level buck converter. The controller regulates the output voltage with dual loops, a current loop inside monitoring inductor current (AFE2+Filter2+DPWM2) and output voltage outside monitoring the output voltage (AFE1+Filter1+DPWM1).
According to the simulation, the input voltages on the input capacitors, series connected, have to be balanced with tuning the duty cycles of buck switches. We have now trouble and questions on the use of current/voltage/flux balancing function of UCD3138A.
In the manual sniu028a I have found several places for cycle adjustment for balancing current/voltage:
At present my plans is: I use another filter (filter0) as the voltage balancing compensation.The error of two input voltages, vc1 and vc2 are sensed in AFE0 and compensated in Filter0. The output of filter0 could be used as duty adjustment to fix the unbalanced vc1 and vc2. The compensated DPWM0A and DPWM0B are used to driven the two switches of Buck.
The configuration is shown below.(I made a mistake the DPWMCYCADJB=-YN)
I use the timer interrupt programa to updated the DPWMCYCADJA and DPWMCYCADJB by reading filter0 outputs. (But I still would like them to be updated automatically instead of CPU interrupt. ) The principle of voltage balancing in this case is to assign DPWMCYCADJA with a positive filter0_output value while DPWMCYCADJB a nagetive -filter0_output value to fix the unbalanced voltage. In the present experiments, I found the duty cycle shrinking very badly when load is light and input voltage low. I have tried many filter coefficients and bandwidth in voltage¤t open loop but the results are not satisfied. The interrupt frequency(around 100kHz) shows a little lower than the configured frequency (T16 timer, 250kHz). Only a few lines of reading and assignment codes are written in the interrupt programa. So
I also have a backup plan. For the first plan above I only used one single DPWM0 to generates two phase shifted PWMs. I still have one DPWM module free (DPWM3). So if I modified the DPWM structure to use two modules, both DPWM0 and DPWM3 to generate two PWM signals, I wonder if the trouble could be solved? The key issue is, how to automatically inject one filter output (filter 0) to two DPWM modules of duty cycles with opposite polarity. (PWM1B duty cycle value =filter1+filter0, PWM3B duty cycle value=filter1-filter0)
OK, if the above plans do not work,,,,,,,I also found the feedforward function in the LOOP MUX . But this function is very wired in the chip because the feedforward is configured to multiply two filter outputs as one to eliminate the high transient of input voltage instead of summation…the traditional feedforward is a summation of inputs...
OK, if the above plans do not work…again… I have to use the CYCADJCTRL in the LOOP MUX. I wonder if the compensation could be injected into one DPWM module with opposite polarities？or do I have to use two DPWM modules? Any reference coding I could look up for this similar application?
I also listed my preferences here：
Firstly I prefer the cycle adjustment to be updated automatically by DDPs.
Secondly, I prefer to eliminate the static error of the voltage balancing.
Thank you very much!
Part Number: BQ25703A
I don't know why 0xd3 means 16384mv and 0xd4 means 16448mv.The datasheet did no mentions it .
Part Number: LMR33630-Q1
Hi Team,
1. Could TI provide the EMI testing report for LMR33630, our target is CISPR25 passed.
2. If this one can not meet CISPR25, then Is there any way could improve it?
Thank you.
Part Number: LM5141
Hi Team,
We are testing EVM for CISPR25 level5, but it still failde at 68~71MHz (excess 5dB)
Is there any way to improve it?
(We had tried gate driver resister to 15Ohm, snubber at switching node)
Thank you.
Part Number: LM53635-Q1
Hi Team,
1. Can TPS53635 passed CISPR25 level 5 without spear spectrum function?
2. What is the side-effect of spear spectrum function? Eff? anything else?
Thank you.
Part Number: TPS53622
Hi,
Please help in providing the artifacts, to calculate accuracy and performance analysis aspect for this part TPS53622A. We understand there is DAC capable of 5mV resolution but how to justify our design with the output voltage as it is variable SVID based. Please suggest your input.
Thanks,
Vikas G.
TI expert：
Our circuit design is as follows, the charge and discharge circuit is designed separately.
The PACK pin of the chip is connected to the charging CH+ and the discharging P+ terminal through R30 and R32 resistors. It is found that if the R30 (connected to CH+) resistor is removed, the undervoltage CUV MOSFET is turned off quickly, and the waveform is as follows:
(red is MOS tube GS terminal voltage waveform, yellow DS terminal voltage waveform, blue current waveform), the turn-off time is very short, 200us,
But if R30 and R32 are both 10K, the test waveform is as follows:
The turn-off time becomes 4.7ms, and the GS waveform has a very long platform at 2V.
Help me to see what is the relationship between CUV protection and PACK pin voltage? Thank you!