Part Number: UCC28950
Hi Expert,
My customer is using UCC28950 now. When they set the input voltage to 200V, the circuit can trigger to protection properly, while when the input voltage is 400V, the protection function failed. They use the SS pin to protect the circuit. Could help check if there is something wrong on the design?
Part Number: TPS720-Q1
Hi Team,
Good day.
My customer is not able to find TPS72009QDRVRQ1 pin1 orientation in the reel for the WSON-6 package.
This is missing in the datasheet, can you help me on this?
Best Regards,
-Renan
Part Number: BQ76PL455A
Hi,
The data sheet mentions that if less than 16 cells used, the unused channel input stages should be omitted and device pins should be shorted. What happens say if we short unused battery inputs to the top of the stack at the battery input socket? It was possible for BQ76PL536A
Part Number: BQ25713
Hello expert,
My customer is looking for battery charger to satisfy below requirement.
・Battery charging voltage: 2.8V
・Charging current:above 1.2A
・additional feature: High accuracy battery voltage monitoring(approx. 0.01V order) and we can acquire this data by I2C. Configurable power path and charging current by I2C.
I guess BQ25713 can satisfy this requirement but this device has excesses specification. So I would like to get professional's advice for this requirement.
Do you have better candidates for this requirements?
I'm looking forward hearing back from you.
Best regards,
Kazuki Kuramochi
Part Number: TLV1117LV
Hi team,
My customer is using TLV1117LV to convert 5V to 3.3V. But there is a special use case in customer's design that the TLV1117LV input is not powered on but the output is connected to a 3.3V voltage. I want to check with you if TLV1117LV will be damaged under this situation?
I think the 3.3V on the output will pass to the input side through the diode of the internal MOS to generate a ~3V voltage at the input pin. Will the chip be powered on due to the ~3V input? Is there any risk here? Thanks.
Best regards,
Wayne
Part Number: BQ24160
Hello,
I would like to know the electrical characteristics when BGATE is on and off.
Part Number: TPS650864
Hi team,
My customer is using TPS6508641 to supply for Xilinx FPGA. They have 2 questions as below:
1. For PS domain, Xilinx FPGA datasheet said Vps_MGTRAVCC needs to be 0.85V as below picture. But in our datasheet Figure-6-9, the VTT LDO output for Vps_MGTRAVCC is 0.9V. So is it wrong in our datasheet?
2. For PL domain, TPS6508641 doesn't have the power rail for VMGTAVTT and VMGTAVCC of ZU2CG-ZU5EG. But TPS6508640 have the power rail for PL domain VMGTAVTT and VMGTAVCC of ZU7CG-ZU15EG. Customer is confused about this. Can you help check?
Thanks.
Best regards,
Wayne
Part Number: UC2909-EP
Hi team,
My customer is using UC2909-EP. In our datasheet as below, there are 2 sets of RC connected to CAO pin and VA- pin. So can you please help explain what is the function of these RC and how to select the proper RC value? Thanks.
Best regards，
Wayne
Part Number: TPS61169
Hi,
I used a LED driver LP3321 (Low Power Semi) before, now I want to replace it with TPS61169, but I want to know how to deal with the Pin4 (Ctrl) .Whether the Ctrl Pin can float?
below is TPS61169 and LP3321 schematic.
Part Number: BQ24725
hi:
Can bq24725 control charging or not charging a battery. I mean, if there is a register or not, can choose charging or not charing a battery. for example, when bq24735 is controling charging a battery, can I change a register to stop charging? please tell me very kindly. thank you very much.
Part Number: BQ24075
Hi friend,
My customer has a question regarding BQ24075 and BQ24075T.
The customer has 2 tasks to implement.
1) To measure battery voltage using divider of 2 x 100 kOhm resistors between Vbat line and GND.
2) To determinate battery presence.
He hasn't any possibility to make a redesign and apply separate fuelgauge IC. But he has an idea to use pin CE# (Charge Enable #) and needs a tip from your side how to make it. There is not need to measure battery voltage constantly, it's sufficient to measure once 5-10 mins. In the datasheet a battery detection algorithm is described, but it's unclear how this algorithm behaves when CE# is high level.
Looking at functional diagramm from the datasheet it's ambiguously what happens when CE# is high (disable). Is't described only the scenario when CE# is low (enable), then precharge phase begins further fast charge phase comes and etc.
The questions:
1) How does behave BQ24075T when CE# is high (disable) and battery is extracted? What is the Vbat line behavior?
2) How does behave BQ24075T when CE# is high (disable) and battery is inserted? What is the Vbat line behavior?
3) How is implemented in BQ24075T battery detection algorithm? What is the Vbat line behavior?
4) How does behave BQ24075 when CE# is high (disable) and battery is extracted? What is the Vbat line behavior?
5) How does behave BQ24075 when CE# is high (disable) and battery is inserted? What is the Vbat line behavior?
6) How is implemented in BQ24075 battery detection algorithm? What is the Vbat line behavior?
Part Number: BQ25898
Hi there,
Could you please help following customer question?
1. How to disable the ADC function for debug the TS pin ripple?
2. could you please pick out the details to disable ADC?
Thanks!
BR,Eason
Part Number: UCC28950
Hello E2E,
Our customer is testing for engineering board that using the UCC28950.
They tried VDD brownout. Result, OUTC and OUTD waveforms and Duty are disturbed from less 8V.
Question;
- Since UVLOx_TH described in the data sheet has not been reached, I think it is a voltage that works properly. Is it normly operation?
Regards,
ACGUY
Part Number: TPS62801
I'm looking for simulation models for TPS62801.
Encrypted models for PSpice are available, but I don't have a licence for that. I can see that unencrypted models might not be available, but is it possible to get encrypted models for Simetrix?
For my current design, I could use TINA-TI, but there are no models available to download from the product page or from Webench.
Part Number: UCC24612
Hello E2E,
Our customer is considering adopt the UCC24612 for new product. That new product is forward topology. Can TI show an example circuit?
Regards,
ACGUY
Part Number: TL4242
HI,
I am testing TL4242, find the PWM dimming not work.
12V power supply
It was found that PWM PIN > 1.3V, LED was fully bright.
PWM < 1.3V, LED is completely extinguished and has no dimming function.
Where is the problem?
my schematic diagram as below:
thanks,
Part Number: TPS61087
Tool/software: WEBENCH® Design Tools
Hello
I need to design a boost converter using TPS61087 that provides 18.5V 250mA from a battery that may have voltage about 2.7V under load. According to TPS61087 datasheet Figure 1 and Figure 2 (Maximum Load Current vs Input Voltage for 650kHz and 1.2MHz) it is possible with fsw=650kHz.
I tried to use webench design tool to calculate the design but it doesn't accept the input parameters (I must lower output current or voltage or increase input voltage). Is that only limitation of the tool that it limits input parameters using worst case (1.2MHz) duty cycle limit? Is is safe to design the converter working at 650kHz (without webench), or I miss something?
Part Number: BQ25601
Hello Sir,
We have a question about /INT pin .
Any FAULT event in REG09 <= D/S 8.3.9.3 description
We can see /INT active when Vin insert and remove .
But we can't see /INT active when we test NTC fault ( hot and cold )
Is there something need to check ?
Many thanks !
Part Number: LM5122-Q1
Tool/software: WEBENCH® Design Tools
Hi,
I used lm5122-Q1 for webench boost converter simulation.
I got a pretty good result about inductor current.
However, In switching voltage graph above, i got the peak voltage.
I wonder why there is peak voltage from 24V to 25V.
Did it happen because the circuit is not stable?
Thanks,
Best regards,
Yunsik
Part Number: LM5170EVM-BIDIR
Hello all,
Some time ago my office buy a DCDC(48V) demo. Recently we have test the board, now I find an issue about the test steps, could you help me check the root cause? Thank you very much!
My test steps is like this:(eg: buck mode 48V to 12V)
The project is ergency, I will wait for your reply, Many thanks!