Part Number: BQ34Z100-G1
We are planning to use reliable fuel gauge for our battery and comes around the IC BQ34Z100-G1, and also developed the board using the datasheet but we don't know how we can use this IC. Please provide the setup configuration for Battery LiFePO4, 4S, 6Ah.
Is there any code available to use this with Arduino ??
I now use the UCC27211 driver chip to complete the driver task. However, the rising and falling edges of the drive signal reached nearly 100 ns. My bootstrap capacitor and Vcc capacitor are close to the chip pins, and the values are 0.1u and 1u, respectively. I tried to use 1u and 4.7u respectively, but it still has the same effect as before. What should I do? Thank you.
Part Number: LM334
Hi Team,
Can you please suggest equivalent for LT3092, not able to find any current source with higher current.
Regards, Shinu Mathew.
Part Number: UC3842
Hi Team,
Can I have some classical schematic suggestion for input under/over voltage protection based on UC3842? Tks a lot.
BR,
Xiaobing (Eric)
Part Number: UCC21520
Hi Experts,
I'm using UCC21520 to drive one leg of a 3phase inverter. The block diagram of the system is -
SCHEMATIC
The high side and low side gate pulses are perfect when no load is attached and DC-link = 0 V. At no load, as DC-Link is increased, beyond 30v, I start hearing a strange hum from the gate-source loop. I'm unable to discern the cause, but this phenomena happens in other phases too. The amplitude of the hum increases as DC-Link increases. It sounds like a HF sine signal.
Things changes drastically when load is attached. At ~30v DC link, 10mh+100ohm RL load, the high side gate pulses get distorted, rapidly switching between high and low in the turn-on duration -
Vg_high is referenced wrt GND.
This phenomenon occurs only during High Side turn on.
Zooming in on the waveforms.
This distortion occured at 30v DC-Link, 100ohm+10mH load. As load resistance is increased, distortion occurs at higher levels of DC-Link (does this have something to do with load current, di/dt issues maybe?)
Surprisingly, the same distortion gets reflected at the MCU side. The supply of the MCU gets distorted in the same manner. I tried changing to a new MCU board, put in bypass capacitors on MCU's LDO and VCC pin, but the problem still persists. (so, maybe the output stage of the driver itself is causing the problem?)
Out of curiosity, I increased the DC_Link further. The hum intensity kept on increasing with DC-Link and at one point, the hum stopped and suddenly the driver started behaving weirdly like this -
(Please visit the site to view this video)
(Colour scheme is changed here, sorry)
YELLOW = HIGH SIDE (wrt to gnd)
BLUE = LOW SIDE (wrt gnd)
Even after multiple resets, the driver now always produces high side gate pulses in the fashion shown in the video. And now, this thing happens at DC-Link <15v, for load = 100ohm + 10mH. In the same turn-on period, the driver initially produces proper high side gate pulses and then just fails for the remaining duration of the on-time. This occurs periodically and only at the HIGH SIDE. Low side pulses are perfect!
Here is a snippet from my board layout -
GATE-SOURCE LAYOUT
Layout with DC-Link
IGBT Capacitance
As per the input capacitance and gate charge, the selected value of Cboot is well above the recommended value. I'm unable to quantify the cause of the high side failure. The distortion occurs at the driver stage and is reflected in the microcontroller board. I have routed PGND and SGND separately and shorted them at only one point (not shown in the layout above)
So, what is causing the problem? How to solve the issues? HAAAALP ME
Part Number: TPS3700
Hi Team,
My customer want to use TPS3700 for a OV&UV monitor for 3.3V power supply to MCU (TMS320F28062) due to functional safety requirement.
But we had a major concern on the accuracy issue. Let's take OV for example, TMS320F28062 maximum operating voltage is 3.63V, so we need to shut down the power supply if it reaches 3.63V. And the power supply nominal 3.3V is coming from a LDO : LM1117I, which is at worst 3.432V. Consider we use 1% res to set the window, and 1% accuracy for TPS3700 over full temp. The headroom for the reliable detection is not quite enough. I wonder what is the solution here?
The application &spec should be very common in functional safety required application, right? So am I looking it the wrong direction? Thanks.
Regards,
Patrick
Part Number: TPS61099
Hi Team,
Customer want to measure TPS61099 quiescent current into VOUT pin. We set up the test bench using TPS61099-768 EVM. Remove feedback resistor, R1, R2, connect a 2V voltage to FB pin through 5kohm resistor. Connect a 5V voltage to the VOUT pin and EN pin, leave the VIN open. And then check the power supply current to VOUT pin, it shows for about 0.9uA, much smaller than the datasheet. Could you give some comments if this is the right method to measure the quiescent to VOUT pin?
Thanks,
Will
Part Number: TPS92691
Hello. I make led driver based on tps92691 sepic evolution board, all components as on this eval board but PWM dimming on 1Khz not stable work in some points from 10 to 15V Vin. Led current is set 0.8A number of leds 8 on 1-10% dimming work is unstable. I try change PWM frequensi but it work unstable in other points Vin. What a can do? Or i need other Led controler chip? My application need stable work 8 leds on current 0.8 A Vin 10-30V 1-100% dimming and output current report.
Part Number: BQ78350-R1
Dear all
1. If the ALERT pin of BQ78350-R1 device is always in GND, What happened on the BQ78350-R1 device ?
2. If the ALERT pin of BQ78350-R1 device is always in high voltage, What happened on the BQ78350-R1 device ?
3. If the ALERT pin of BQ78350-R1 device is always in float, What happened on the BQ78350-R1 device ?
Part Number: TPS3700
Hi team
my customer has a design requirement via TPS3700
The input voltage (Vmon) is used to supply power to MCU, normally around 3.3V, so they need to design a voltage monitoring and protection circuit now:
1. When the input voltage (Vmon) is 3.6V ~ 4.7V, a falling edge signal is output to reset the MCU reset pin (RST).
2. When the input voltage (Vmon) is greater than 4.7V, a low-level signal is output to turn off the DCDC supplying power to the chip.
In this design, I used the resistance calculation software on the page of tps3700. After I input the required voltage, I get the resistance(R1,R2,R3) of the peripheral circuit.
Then I use Tina to build the simulation circuit. Through simulation, it is found that the result is not consistent with the theory. OUTA does not have high-level jump when Vmon is greater than 3.6V.
1. Could you please help me analysis that result ?
2. Could you please give me a design based on my customer ' s requirement and help me calculate the R1,R2,R3 and Rp value?
Best regards
Jean Liao
jean-liao@ti.com
Part Number: LMR14020
I am working with LMR14020, it has internal two mosfet, high side and low side.
If the low side mosfet becomes open circuited,then how will the regulator will behave
Part Number: BQ76PL455A-Q1
I just made my own BMS using the BQ76PL455A following the eval board for the most part. Upon first testing I noticed that the two 200ohm resistors that are on the top line get really hot, like excessively hot. I was wondering if anyone else has come across this or why this would be happening? Also why is the design recommendation to put two 200ohm in series instead of just one 400ohm? Any answers would be appreciated, thanks.
Part Number: UCC37324
Hi, I would like to use the UCC37324 chip to power or drive a PMSM that we have design. However, we need to develop a specific design since the motor is a dual-stator with different winding inductance. We like this chip because it's a DIP format. However, I'm not expert enough to determine if this chip, will be able to handle up to 250Vdc link on the MOSFETs or IGBTs sides, I was unable to find any information on this matter. For example, it's very clear in the data sheet of the UCC27712.
Also, since the UCC37324 seams to have no boostrap and if it's capable to be use in an inverter, then the inverter would need to be driven-design in bipolar scheme, right?
Thanks,
Donald W.
Openvolta project
Part Number: BQ34110
Tool/software: TI C/C++ Compiler
Hi sir /mam
i have done voltage and temperature calibration .
now i stack in floating point conversion for CCgain and CC delta value.
without current calibration.
Bq34110 current reading:768 mili amp
in Ammeter current reading :1.34 amp
if i calibration with floating point conversion then then Bq34110 reading is 0 mili amp.
Part Number: UCC28722
Hi Everybody,
I am designing a bias supply by UCC28722 which is supplied with a DC voltage ( of a pfc converter using UCC28019A controller ).
The supply voltage is 390 VDC typically which is from 380 to 400 VDC and has a 23.4 V peak to peak ripple. ( ie the minimum voltage equals 380-23.4/2 V ~ 368VDC )
I use the provided excel calculator SLUC529.
In the row 35, the primary peak current of the transformer is calculated by:
Ippk=Pout*2/(Eff*(Vinmin*SQRT(2)*0.6)*Dmax)
I modified the above equation to the bellow one ( to adapt the minimum input voltage ):
=Pout*2/(Eff*(Vinmin*SQRT(2)-Vrip/2)*Dmax) ---> Pout=5W, Eff=0.75, Vinmin= 269VAC ( 380 VDC ), Vrip=23.4, Dmax=0.495
Which results in 73.1 mA peak to peak.
And then the Lpm=31.2 mH.
Also the Nps~77.
Now please consider the TIDA-00355 reference design which is very similar to my application.
The transformer used in the the design is a Lpm=4mH and Nps=10.
Although the tow applications are very similar the designs differ considerably.
Is my design correct and optimum?
Why the reference design differs to my one?
Regards, Ras
Part Number: BUCK-CONVCALC
Hi,
I know there's an excel about how to design DCDC compensator , could you give me this excel ？or I only can get it from your FAE ?
Thank you.
Part Number: BQ24610
Hi,
I am trying to find my way through TI's battery charger portfolio.
I am designing a small hand-held device that is easily fed by a single cell battery (preferably NiMH or Li+). It has 3.3V system voltage and only draws a few hundred milliamps. Charging should be fool-proof, preferably from common power sources such as a wall adapter or a USB port. A wider input voltage range (e.g., industry standard 24V) would be eligible. Also within the scope of being fool-proof is the fact that the device is very likely to be inadvertently left switched on after use.
So far I found out about the above mentioned bg2461x series of ICs. Yet I am having a little trouble sorting them out. This is what I think I found so far:
Especially the bq24617 strikes me a bit. What is special about it?
Nonetheless, I am mostly worried about deep discharging (thus damaging) the battery in case the operator forgets to switch off the device after use. From reading the datasheets it is not quite clear to me whether the above ICs provide a means of disconnecting the system load (BATDRV signal) when the battery is discharged to a certain level. For comparison the bq24703 has a BATDEP signal and for my understanding it automatically switches over to AC power in case the depletion level is hit. Yet it seems to only do so if an AC adapter is present.
To conclude, my questions would be:
Thank you very much!
Yours,
Sven
Part Number: BQ27542-G1
Hi Team,
We are planing to use this FUEL GAUGE with MCU .
For MUC Voltage Level is 3.3V .
So for I2C communication we can direct connect or need to use level translator .
We are waiting for your response ........
Thanks ,
Shubham
Part Number: TPS62363
Hi,
I am working on a dynamic voltage and frequency scaling (DVFS) integrated circuit design that is intended to use an off-chip power management IC（TPS62363） to regulate different voltages. I only find the example of voltage transition controlled by SEL pins in the data sheet. How to estimate the time of voltage transition controlled by I2C? I mean the time from the PMIC confirming the VID data to the completion of the voltage transition.
Best regards,
Noah
Part Number: BQ4050
Hi,
I'm using BQ4050 for gauging of 2 cells in series. I have a question about the remaining capacity(RM) register. What does this value represent? Does it represent average RM or max/min RM of 2 cells?
