Part Number:TPS548D21
Hi,
Can we get the Board file/ Gerber file for the TPS548D21 EVM?
http://www.ti.com/lit/ug/sluubg3a/sluubg3a.pdf
As per the TPS548D21 datasheet, section 10.1, “ a total of 35 thermal vias are used (outer diameter of 20mil) in the TPS548D21EVM-784”
We are trying to follow the above for reference.
I would like to understand the drill hole size used for the thermal vias.
Thanks
Louis
Part Number:BQ25895
Hi,
I am trying to use the BQ25895 as a UPS controller to both charge a LiPo battery pack (2x 18650 in parallel) and supply power to a Raspberry Pi 3 B+ connected to PMID (5V + boost converter).
With Vbus = 0 (no external power supply) and LiPo battery connected, PMID is at 5V and the Raspberry PI boots correctly.
When I connect an external 5V power supply to Vbus, I see a very short glitch (<5ms) on PMID and the Raspberry PI continues to work fine. The battery is charging also correctly.
When I disconnect the 5V external power supply from Vbus, the PMID goes down to ca. Vbat (3.7V) for ca. 38ms and then goes back again to 5V.
Clearly this long voltage drop resets the Raspberry PI.
Is the length of this voltage drop structural? or can it be avoided/minimized? or is it possibly due to a problem with my setup (I use the same circuitry as in the EVM demo board).
Looking forward to getting some hints.... thanks!
Part Number:LP5569
Is it possible to tie together for example four outputs to be able to drive a 100mA led?
Part Number:TPS2490
Hello
1. Is MIN, MAX of the current limit determined by Vsense MIN, MAX?
2. How does the current limit for temperature change?
(Please visit the site to view this file)
Best Regards
Part Number:TPS43333-Q1
HI TI emlpoyees
TPS43333 has two outputs, namely VBUCK A and VBUCK B，it's a controller.
What I want to know is whether I can output more power if I increase the power of MOS, and output 5V5A in both ways
Part Number:TPS2373-4EVM-758
Hi ,
My design is exactly the same as 8228.PMP21318_RevA(001)_Sch.
On my circuit board, I found that the duty cycle is not adjustable, and the duty cycle is always the maximum output.Working normally at 12V 5A( 90% efficiency), and the ripple is normal 50mv.Among them, the circuit near TL431 has great interference, resulting in the lifting of load, TL431 K level is always 11v, almost unchanged, resulting in the optocoupler feedback voltage at the other end is always 3.3v (TP23), thus the duty ratio is the largest, always the same.What may be the cause of this problem?I am now testing the external power supply.
My schematic
(Please visit the site to view this file)
Reference schematic
(Please visit the site to view this file)
The 12 v OUT ripple
TL431 K ripple
Part Number:TPS5450
Hello,
Iam using TPS5450,According to circuit diagram from datasheet there are resistor divider network of r1=10 k and r2=3.16 k, but in my case i use r2 =3.3 k as 3.16 k is not available. following are the observation
| vin | vout | vsense(pin no 4) |
| 5.5 | 3.6 | 0.98 |
| 6 | 4.08 | 1.10 |
| 7 | 5.02 | 1.36 |
| 12 | 2.92 | 0.80 |
when i apply input voltage 12 v or after 11v output voltage is decreasing, and after 12 v it remain contant 2.92 V.
and my requirement is vin =24v, vout= 4.2v and current =3.5A.
Please guide me how to achieve that.
regards
Ajitem Kudtarkar
Dear Sir,
First, I can't find the TPS51486 part number in first column. Therefore, i didn't key in part number
Our customer is using TPS51486 in their design. and currently they found out that the VTT_CNTL pin function in-normal with they testing Power in On/Off in the charmer temperature 55 °C
Here is the normal operation waveform: (ambient temperature 25 °C) the system works fine with Power in On/Off! (the VTT_CNTL control signal control is form the CPU)
And when we test system Power in On/Off in the chamber with 55°C, the waveform is as below, the VTT_CNTL have no response for the CPU signal and it caused VDDQ and VTT power up failure
and then we suspense that might the CPU control signal error, Therefore, we connect the the VTT_CNTL to the TPS51486 power good, and here is the waveform show the system work ok with Power in On/Off under 25°C
And then we have the system in the chamber testing Power in On/Off under 55°C , and again, as the waveform shown below, the VDDQ and VTT failure to power due to the VTT_CNTL fail to pull up the voltage to (PG have pull-up 100K to 3.3V) and clamp the signal to low
it seems that the VTT_CNTL have some problem functional under high temperature. please kindly help us check what would cause the issue. i also attach the schematic as your reference. Please kinldy help us with this soon as you can due to customer next built is in a week and they can go in the next built without fixing this issue
(Please visit the site to view this file)
Above, if there is any question,please feel free to let me know
Cheers
Alec
Hello,
My project needs to drive a medium power ultrasonic piezoelectric transducer. The driver designs I have seen for these transducers typically use switching i.e. square waves to drive them, MOSFET driven, with Vpp 100v-200v in some cases!
Question: What are my simplest options for driving these transducers.
* Resonant frequency: 28 KHz
* Input power: 20W
* Datasheet: I wish I could find one! :(
Part Number:CSD95372BQ5M
Team,
Could you please provide the Operating junction temperature?
It is needed for Thermal simulation.
I could find the other data needed (Theta and PSI) for the simulation but the Operating junction temperature is missing.
Thanks in advance,
A.
Part Number:TPS659037
Hi,
I use the TPS6590379 in one of our designs.
At the GPADC_IN2 I have a voltage devider with RT=10kOhm and RB=68kOhm connected to VANA (LDOVANA_OUT). I measure VANA as 2.094V.
The theoretic output voltage of the divider should be 1.825V but I only measure 1.45VDC at GPADC_IN2.
Can you please tell me the input impedance of the GPADC_IN2 input. It looks like GPADC_IN2 has a resistor of around 33kOhm to GND.
Thanks and best regards,
Patrick
Part Number:TPS65720
Hi!
We are using a TPS657201 pmic in a project and we want to reduce te charge current when the battery temperature is below 10 degrees Celsius.
From what I can gather from the datasheet you can measure the TS_OUT and get a voltage in the range from 0 to 1.4V which in turn represents the temperature span from -20 to 60 degrees Celsius.
Is this scale linear or how does the transformation from voltage to temperature work?
Thanks in advance!
Best regards,
Björn
Part Number:TPS65720
Hi!
I want to reduce the charge current in a product I am developing when the temperature is below a certain degree.
From what I can see in the datasheet for the TPS657201 PMIC the TS_OUT pin can be used to read a voltage that corresponds to a temperature. The voltage interval is 0 to 1.4V and the corresponding temperature scale is -20 to 60 degrees Celsius. How is this conversion made? Is it a linear conversion?
How would one go about to get a battery temperature measurement using the value from the TS_OUT pin?
Thanks in advance!
Best regards,
Björn
Part Number:LMR36015
Tool/software:TINA-TI or Spice Models
Hello everybody,
I want do do some simulations with the spice model of LMR36015FB (http://www.ti.com/lit/zip/snvmbq5) in LTspice.
In the LMR36015FB_TRANS.LIB on spice line 1 there are the two parameters MODE and FASTSS:
.SUBCKT LMR36015FB_TRANS AGND BST EN FB NC PG PGND_0 PGND_1 SW VCC VIN_0 VIN_1 PARAMS: MODE=0 FASTSS=0
Can you explain me the meaning of these parameters? Which values can be chosen? I didn't find any explanation in the model usage notes.
Thanks in advance!
Best regards,
Simon
