Part Number: BQ25713
Hi Sir,
I would like to know what's the BATDRV turn on or off condition on charge/discharge mode?
For example, during the discharge mode with 2cell battery, the battery voltage is 6.2V, I want to know what's the behavior on BATDRV pin when the system have abnormal voltage(around 8V). (because I afraid the 8V will go to battery/6.2v if the BATDRV still turn on in this abnormal scenario)
Thank you
Arisa
Part Number: LM5007
LM5007MMEP national Semiconductor: Problem: We used in the yaers before this obsolete NSC-IC mit the suffixe MMEP, means MM (=MUA08-case) and EP (=Enhanced Plastic High Voltage). We know that obsolete and not any longer gettable. So far OK.
We see that Texas has the Type LM5007MM but the version LM5007MMEP exists not . The case is the same, this we could find out without problems. But has this Texas type LM5007MM also the spec "Enhanced High Voltage" although it isn't mentioned in the data-sheet?. Are both type LM5007MMEP (old NSC) and the LM5007MM (TI) equivalent? So far I couldn't find informations/documentations.
If you have any idea or support, it would be fine...
regards KBFritz,Germany
Part Number: LMR14050-Q1
Could you provide the worst case Ton_min (minimum controllable on time) under the condition of Vin of 8V to 16V, Iload of 0.2A and 2.5A, and between -40C to 85C ? The typical value is 75ns, but we do not know how much this value could change under all other conditions. Thank you.
Part Number: LM5146-Q1
Hello,
We were using LM5085 as a battery charger configured for 16.8V output limited at 5A. We had to switch to LM5146-Q1 because it can accept up to 100V, while the LM5085 will only accept up to 75V. As far as I can understanding from using the evaluation board for LM5146-Q1, it is possible to set a current limit that will trip an over current protection -- however this seems to shut off the output current rather than clip it at a specified value.
Is it possible to configure LM5146-Q1 so that it delivers current-limited power? i.e.: when the battery wants to pull 20A at 16.8V it will only get 5A from the circuit.
Respectfully,
-Anthony Andrew
Part Number: LMZM23600
I was looking to make a footprint for the LMZM23600 and there is no mechanical or footprint information in the datasheet. The Ultra Librarian export failed for my CAD software. Can you provide the drawing for the 10 pin SIL?
Mark
Part Number: UCC28742
Tool/software: WEBENCH® Design Tools
Here are some waveforms.
Tek09 image is as follows: - 15.34Vdc output with No additional Load
CH1 - Mosfet Gate pin
CH2 - Mosfet Source pin
Math - CH1 - CH2
CH3 - Voltage at Chip VS pin
CH4 - Voltage at Chip CS pin
Tek10 image is as follows - 16.75Vdc output (too high output voltage than desired) with 150ohm load
Scope connections unchanged
Tek11 image is as follows - 9.78Vdc output (too low) with a 15-ohm load. Needs to provide 1.3Adc at 15Vdc.
Scope connections unchanged.
Tek 14 image is a follows - Math value 4.96Vpk for voltage across Vcs resistor
CH1 - Mosfet Gate pin
CH2 - Mosfet Source pin
CH3 - Rcs resistor (side connected to Mosfet)
CH4 - Rcs resistor (side connected to COM)
I am looking at getting some high voltage probes to measure the Drain to Souce voltage of the Mosfet.
I can not figure out why my output voltage is dropping so low when I need it to stay above 14.5Vmin while providing 1.3A.
Part Number: TPS63020
We have been using the TPS63020 in our designs for several years, but are now updating the PCB. Previously we had VINA connected to VIN, but I notice the data sheet was modified 3/19 to remove the VIN/VINA connection. FIgure 3 shows an internal resistor between VIN and VINA. There is no mention of the resistor, or the relationship of VINA to VIN. Sould we now drop the connection between VIN and VINA (using the internal resistor and an external filter capacitor), put an external (what value?) resistor between VIN and VINA, or how should these now be handled?
Part Number: BQ24105
Hi,
Since I am trying to minimize the sleep current of the system, in order to set the FB voltage to 2.1V, how large can the resistor divider values be before an issue arises ?
Thanks,
Steve
Part Number: TPS7H2201-SP
Team,
I am trying to make sure that I understand the 22A fault protection. We show the 22A in a figure, but the times are not defined on the figure. I am planning on using this part for a power switch board.
In looking at the data sheet, it looks like the 22A fault protection during a fault, holds at 22A for 15 to 35uSec, turns off for 61 to 158 uSec and then tries to turn on again? I am I right? Also when the TPS7H2201-SP comes up again does it ramp up with the slew rate it is set at?
What I want to do is to keep the 22A fast trip capability and set up the switch with out the caps needed for the timers. I would like the switch to current limit and stay there, until the short is removed and then when the short is removed it goes back to normal load current. Is this possible? What do I need to do with pins 9 and 11? Do I ground them?
See pin 11 below, if I ground pin 11: I disable both the ILTIMER and the RTIMER? So, then the short circuit current would current limit and stay there, until the short disappeared? What do I do with pin 9? It appears, I ground pin 9. It talks about the need to then cycle the EN pin. Could this possibly interfere with initial turn on of the switch? Turn on due to the input powering up or the chip receiving an EN signal?
One other thought, I could just make the ILTIMER period long and if nothing happens have the switch turn off? How long can I make ILTIMER? If I did this and grounded pin 9 and ILTIMER timed out would the chip be disabled, and need an EN signal to bring it back online?
Part Number: TPS22810
Hi,
I'm using TPS22810 and TLC393 with a constant current source as the main parts of a supercapacitor charge circuit. The goal is to charge with low current, discharge through TPS22810 when TLC393 trigger his ENABLE pin, and charge again while ENABLE is disabled because Vcap is below the target.
I have two problems: comparator seems to work well with very slow input (power supply controlled by hand...) or with some ramp waveform, but not always, and the other problem is Voltage drop on load switch (and overheat) when output current is higher than available (My supply is limited to 100mA, and I try to get 200mA with a load). The following snapshot was taken in this situation:
This is the schematic:
Part Number: LM27761
Hi,
According to eq.5 in p13, Vout should be able to hit -Vref (1.22V), but section 6.5 says it can only do -5 to -1.5V. How come?
VOUT = –1.22 V × (R1 + R2) / R2
I need to generate a low noise -1.3V/100mA from +3.3V to +5V, and other than the limit above, this device is ideal because of the output LDO. Suggestions?
Part Number: BQ24195
Hello!
We are using the BQ24195 chip within a powerbank application.
With loads below 1.7A the chip works correctly, but if the load is higher, I meet with a voltage drop after a few minutes of work. The temperature of the chip reaches 85 degrees.
What role does the size of the PCB board play in overheating? Also, we have vias and thermal pad in our design, but we still face the problem of overheating. We've made a space with an open ground area on the top and bottom layers of the PCB to dissipate heat, which has slightly improved the situation.
I have an Evaluation Board on my hands, but I don't see this much heat under heavy loads.
I've attached the top layer of our application, maybe you'll have some tips on how to improve the situation.
Best Regards!
Part Number: USB-TO-GPIO
I am having trouble connecting USB-TO-GPIO to PC. I see the green light on the adapter, however, the GUI says adapter not attached. Also, the device manager displays an 'unknown device'.
Please see attached screenshots. Could anyone provide a solution for this issue?
Part Number: TPS7A8300
Hi Team,
Is it OK to assume that the dropout voltage characteristics of TPS7A83A and TPS7A8300 are the same?
My customer asked that
The dropout voltage graph described in the TPS7A8300 data sheet is difficult to understand,
and the TPS7A83A was easy to understand. If the characteristics were the same,
I would like to refer to the TPS7A83A.
Sorry for the urgent request, can you answer ASAP?
Thanks
Best regards,
Shidara
Part Number: TPS3836
Hello,
I am using TPS3836 in my design. Unfortunately something else caused a requirement change that puts me in a difficult situation. I am comfortable with 200msec of delay (CT attached to VCC=3.3V); however, the specifications on this delay range from 100msec to 300msec from 200msec (nominal). This is prohibitive tolerance range. Am I reading these values correct? I need something in the 150ms to 250msec range. Does TI have a similar pinout part that can achieve better tolerancing on delay?
Sincerely,
MK.
Part Number: TPS7A88
We need to test circuit boards with the TPS7A88 on board supplying +3.3V to the circuit. At the end of the test, we need to turn off power through the TPS7A88 and power the +3.3V bus using an external power supply. Our question is, is the output of the TPS7A88 protected from external power being applied to its output? No other power will be applied to the boards under test.
By the way, the two outputs are tied together in this circuit.
Thank you,
Dave
Part Number: TPS7A4701EVM-094
Hello,
I am using the eval board, with the test setup described in the user guide. However, when the enable jumper is turned to ON it looks like there is a short, the input voltage drops from 12V to 2.5V. Current draw is less than 0.5A. I am using a load resistor of 2 ohms (30W). My output voltage jumper is is set to 3.2V. Switching the jumper back to the off enable jumper, the input voltage shows 12 V.
Part Number: TPS23881
What is the best method to use discrete control signals to enable/disable port power? We have a single port application and need to enable or disable the PSE output power with a discrete control signal. I have been able to perform the power on/off control using the \RESET input. Pulling it low definitely turns off the port power. Is that the best method or is there a better way? Appreciate your help.
Part Number: LM5066
I am testing hotswap circuit (lm5066) for "startup into short". The output of the LM5066 is shorted then I enable the device. in a good case, LM5066 has to realize the huge current in a usec and Cicuit Breaker (CB) gets activated and hold the gate low and as a result shut down the output. however I am seeing that the power FET (CDS19536KTT) is burning when I run this test. below are the status of afew registers after the failhecking registers after fail:
D7h=00h
80h=10h
E1h=08BAh
Register D7 is 00h so no safety feature is disabled. register 80h, i see that the bit 7 (CB fault) is not even triggered.
Why the CB is not getting triggered?
Part Number: TPS2595
Hi,