Part Number: LM61460-Q1
Hi,
When will the LM61460-Q1 be MP?
Thanks！
↧
LM61460-Q1: MP Time
↧
BQ25601: BQ25601 REG00 question
Part Number: BQ25601
Hello Sir,
Question1 :
We meet a problem that REG00 value we write 0x13 . But this value will be written to 0x04 after VBUS removed .
Do you have any idea ? TKS !
Below is initial setting .
charger_write_reg(0x00, 0x13); // Bit [4:0]: Input Current Limit set 2A
charger_write_reg(0x01, 0x5A);
charger_write_reg(0x02, 0x84); // Bit [5:0]: Fast Charge Current set 240mA
charger_write_reg(0x03, 0x00); // Bit [7:4]: Precharge Current set 120mA, Bit [3:0]: Termination Current set 120mA
charger_write_reg(0x04, 0x59); // Bit [0]: 1 is Recharge threshold set 200mV
charger_write_reg(0x05, 0x8F); // Bit [5:4]: watchdog, 00 is Disable timer, 01 is 40s, 10 is 80s,11 is 160s
charger_write_reg(0x06, 0x66);
charger_write_reg(0x07, 0x48); // Bit [2]: Disable BATFET reset function.
Question 2:
For /INT function , seems REG0A VINDPM and IINDPM also will output /INT and need to read REG0A like REG09's fault event,right ?
Due to D/S 8.3.9.3 only mention about REG09 . Don't mention about REG0A . Just want to double confirm. TKS !
↧
↧
TPS2373-4EVM-758: Transformer placement
Part Number: TPS2373-4EVM-758
Hello
For layout view, could below components place to bottom layer under transformer(top layer)? Has any risk for it? Thank you.
BR
Patrick
↧
TPS54310: My customer is looking for the solution below to achieve the two 3.3v‘s current are the same
Part Number: TPS54310
Hi team,
My customer is looking for the solution below to achieve the two 3.3v‘s current are the same. The two 3.3v are connected together. Do you have some suggestions? Thanks.
↧
CSD87502Q2: Access to Altium Lib Package for TI MOSFETs
Part Number: CSD87502Q2
Is there an open Altium Lib package for TI MOSFETs. My customer is blocked from installing UltraLibrarian by his IT dept.
↧
↧
HVP-Flyback controller for 138W solution
Hi team,
Please kindly suggest the solution for below requirements, thanks a lot!
- No PFC needed, Vin at 170Vac-264Vac (high line version)
- Efficiency target: >86%
Thanks a lot!
BR,
Sean Liao
↧
BQ25120A: vsys voltage incorrect
Part Number: BQ25120A
Hello
My customer used BQ25120A in samrt watch project, now the watch is wearing and using by their internal employees for internal test, but happen 6-7 set watch doesn't work, and panel is light off, firstly, they think it caused by exhauted battery,so they plug in VBUS to charging, but the watch also doesn't work, and input current is 0mA， then they find the VSYS voltage is not 1.8V, becomes to 1.1V or1.3V or 1.4V````, lower than minimum voltage that system needed, so this is the key factor. LDO also change to 0V, the INT pin I cann't test it because no test pad, and as the sys is lower than system operation voltage,it also couldn't read registers.
After disconnect the battery and connect battery the Watch could recovery work automatically. inject 1.8V at SYS pin the Watch also could work normal.
The SW pin waveform seems normal except for heavy load waveform change to no-load switch waveform, the waveform outline is right, in DCM setion the level normal is 1.8V,fault level is 1.1V or 1.3V. I havn't save the waveform so I can't upload in post.
Strange things is this fault is random happen,we are not easy to repeat this fault, and we don't known what happening.
1) Do you have encounter something fault like this ?and please give some comments, thanks
Actually,BQ25120A have watchdog timer could prevent something program runing over, but beacuse we find in battery active mode,the Ibat current will incrase 500uA relative Hi-Z mode, this is unacceptable to customer, so in software,they pull CD pin to Low to close watchdog, just pull CD high when it need I2C interaction,and pull CD pin low again when I2C interation finished. so I think this is why watchdog doesn't clear fault.
2)Do you have any way to save power dissipation ? I also test on the EVM, the watchdog indeed extra need 500uA current from Battery
3)Any suggestions to find root cause ?
4)To disable the TS function, connect TS pin exceed 60%Vin is right ? I think 57% is not enough.
↧
BQ24190: Low battery indicator LED flashes and is on even after battery is charged in 3.90v – 4.15v range
Part Number: BQ24190
With the BQ24190RGER, we have the following issues:
1) Low battery indicator LED flashes even after battery is charged.
2) Charging indicator LED stays on after external charger is disconnected.
3) With the battery circuit board powered off, once the battery reaches 3.88v the charging indicator LED persists even after removing the micro USB charger/power source.
4) The charging indicator will turn off once the board is powered up.
5) If the power level on the board reaches 3.90v – 4.15v and the micro USB is removed the charging indicator will remain on until the battery voltage falls below 3.88v.
6) While running a battery life test, have a solid 9 hours of battery life until the low battery indicator LED lights. Then we have an additional 11 hours of battery life while the circuit is indicating low battery.
↧
UCC28780: ABM instability at higher input voltage
Part Number: UCC28780
Hi,
I'm working on ACF application with DC input and output. When DC input >300V and output voltage = 20V, I see some instability in ABM mode. Sometimes PWMH signal is missing as shown in the first image. This condition happens randomly when operating at 0.2A-1A load current @ 20V output. Second image shows how it should be in normal operation. After the last PWML signal, PWMH shouldn't be there. What can cause such behavior? Please help.
Thanks
(Please visit the site to view this file)
↧
↧
UCD90320: I/O state at start up
Part Number: UCD90320
Hi,
I understand that for UCD90160 and UCD90120 some of the pins, like FPWM, are driven low when the UCD is powering up until POR is released. Is this still the case on the UCD90320 or are all the I/O pins held at tri-state?
Thanks,
Jose
↧
Looking for a high temperature Active Clamp Flyback controller
Do you have a high temperature (175 C +) Active Clamp Flyback Controller? Please let us know if you have one.
↧
BQ25125: Changing the default value of the BQ2512x family
Part Number: BQ25125
Hi,
I was wondering is there a way to set the default DC/DC output to 3.0V... This family of parts has everything I need except I need it to run it @ 3.0V upon power up
↧
TPS43061: output ringing, reliability, causes, and alternatives
Part Number: TPS43061
This is a follow up to this forum post.
The TPS43061 exhibits a large ringing at the output. As discussed in the previous post, we have ways of mitigating that ringing, but without completely eliminating it.
Questions:
1. Does the ringing affect the reliability of any parts in the circuit?
2. What is the main reason for the ringing? We seem observe a consistent 250MHz in multiple boards, including our EVM's and prototypes from the customer. If the frequency was a result of parasitics in the board, one would expect a range of different frequencies for multiple setups.
3. Would the ringing be different if we select different MOSFET's? If so, what would be the main parameter to consider? Total input capacitance?
Thank you!
↧
↧
LMZ21701: Need LMZ21701 step file 3D model
Part Number: LMZ21701
I'd like to put in a request to get the step file for the LMZ21701 power module with integrated inductor. I have checked the web site: https://webench.ti.com/cad/ , but the step file is not there. I have a very space-constrained design and I need to accurately model it in 3D. So, I need step files for all my components.
Thanks,
Carl Olen
↧
LP5562: current limiting resistors
Part Number: LP5562
I'm looking at the LP5562 datasheet, and I'm curious if I need to add current limiting resistors in series with the LEDs. Should I be worried about too much power dissipation in the LED driver without the series resistors?
What's the typical voltage headroom needed on the LED pins?
Are unused LED pins recommended to be let unconnected or connected to GND?
↧
BQ34Z100-G1: NiMH Charge Termination
Part Number: BQ34Z100-G1
For a NiMH battery, I know that the Delta Temperature and Delta Voltage methods are used for a NiMH chem ID. I would prefer to use the Delta Voltage method. Is there a way to make it so that the gauge only looks at the Delta Voltage method?
↧
TPS717: Feedback Divider Impedance
Part Number: TPS717
Page 18 of the TPS71701 data sheet indicates that the lower resistor of the feedback divider MUST be between 160k and 320k:
In the application in question, we need to hit a fairly tight (3%) output regulation accuracy and need to use 0.1% resistors since the internal reference is +/-2%.
We are not concerned with the quiescent current of the circuit, and have lower decade resistor values available in 0.1% tolerance.
What is driving this requirement for R2 to be between 160k and 320k?
What do we need to add to the circuit so that we can use a lower impedance feedback divider?
I've never seen such a requirement before, and want to better understand what is going on here with this part.
Thanks, Best, Steve
FAE, Colorado
↧
↧
LM5050-1-Q1: can this part be used for OVP
Part Number: LM5050-1-Q1
Hi,
can LM5050 be used as an OVP switch? - the application requires 140C and this seems to be the only power switch controller capable of the extended temperature (the Q0 vresion).
Thank you.
Regards,
Alberto
↧
LMZ12002EXT: Power management forum
Part Number: LMZ12002EXT
Hi,
I was browsing for AECQ qualified Buck modules, and this is what comes closest to it.
Is there any data that evaluates in for automotive applications?
Thank you!
Regards,
Alberto
↧
BQ24780S: Discharge output capacitor when battery absent
Part Number: BQ24780S
Hello,
A system includes a battery, gauge and charge as show the diagram below.
The gauge and charger are working as expected, however there is a situation where the system shows the battery state as present after the battery is removed. This situation is caused by the output capacitors of the charger, which take long time to discharge with the battery gauge.
Please, may I know if there is a suggested approach in order to detect the battery state (absent or present) intermediately after the battery is removed? Please, consider the battery doesn't have a detection pin. Just the two power contacts (+/-).
Thanks
↧