Part Number:BQ500212A
Could someone tell me exactly where i could check the Primary+communication Signal on the Transmitter side while charging.
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BQ500212A: Demodulation Signal Input from receiver
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WEBENCH® Tools/UCC256304: Doubler Output version at 400V exist in Webench?
Part Number:UCC256304
Tool/software: WEBENCH® Design Tools
Hello All,
My customer is using Webench for UCC256304.
Below his question:
Webench sizes the stabilization network automatically for UCC256304 ... Is there an AppNote (like for the transformer) ... or something customer can evaluate in order to stabilize a version with a doubler 400V output that can not be simulated in Webench?
Any comments?
Many Thanks,
Antonio
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BQ27750: Common design with BQ25896
Part Number:BQ27750
I have successfully implemented BQ25896 design for my 1-cell 18650 Li-Ion batterry. Now I'd like to implement more precise battery charge/discharge metering using battery gauge chip BQ27750.
I'm just wondering how to properly implement NTC component? Should I use both of them on my cell or should I leave one not connected ?
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EV2400: Using the VCC pins on 4 pin header
Part Number:EV2400
Hello there,
I wanted to use the WOD.2 pin from J3 header in order to provide voltage for the I2C interface device connected thorugh J3 header. The problem is, there is no voltage on WOD.2 pin. tracing it on the schematic reveals that this output is controller by U12, which is driver using signal WOD.2EN by the EV2400 MCU. The datasheet states that those pins are for future use. Is there any real way I can turn the WOD.2EN at the moment using 0.18 firmware? Maybe there is a newer one? I would appreciate all help.
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LM385-1.2: Temperature Range -40 +100?
Part Number: LM385-1.2
Hello All,
My customer is using LM385-1.2 in package SOT-23.
They are now looking for the same product same package with temperature range -40°C +100°C, any comments here?
Many Thanks,
Antonio
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BQ40Z60EVM-578: Schematic in ACCEL-ASCII or eagle cad format?
Part Number:BQ40Z60EVM-578
Can I get the schematic exported from altium in ACCEL-ASCII or Eagle cad format?
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PMP8740
Dear Roberto,
How are you? Hope you doing well.
While going through the software programes for PMP8740 we have stucked at few things...
1) How the Fan speed set in program? what is 415 count ?
2) In software Port P2.7 is assigned as 'Connect Load' ; but in hardware we are not able to find this signal, As on Microcontroller board J1_pin5 is P2.7 but on full bridge board J2_pin5 left open. plz help.
3)Why there are difference between parameters range in Flash.c and main.c ? eg. tricke voltage 0-274 (In flash.c) & 0-315 (in main.C); mains UV 170-200 (In flash.c) & 80-200 (in main.C); current limit 10-60 (In flash.c) & 0-60 (in main.C); Minimum_current_tricke 2-10 (In flash.c) & 2-20 (in main.C)
4) when program starts we have Minimum_current_tricke range in main.c as 2 to 20 and if we set value as 19, then during operation Minimum_current_trickle value will be considered as 19 Only. But when charger unit is switched OFF and ON then while restoring the Minimum_current_tricke vlaue , it will restores as 6 as per flash.c. am i correct? If i am correct, then why it restores as 6 instead of 19? and if i am wrong then what value will be restores in Minimum_current_tricke? 6 or 19? plz help.
Thanks,
Anjana
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Parameters between Fuel Gauge and Charger.
Part Number: Bq25880rtwr
I used bq25890 in my project as charger. Can you suggest me a compatible fuel gauge? Now i used bq27510-g3 as fuel gauge.
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BQ4050: State-of-Health Function
Part Number:BQ4050
Hi,
My customer is using the BQ4050 and would like to charge to only ~90% in the field to extend the lifetime of the battery. However, they would like to make sure it does not reflect an incorrect state-of-health reading. Which parameters should they change in order to do this? I was thinking they could just change Design Capacity to the lower SOC they plan to charge to, but the TRM states it uses a different SOH function without going into much detail. Are there any other parameters they would need to change? Another idea would be to just increase the termination current to avoid charging the last few %, but I assume this would still cause an incorrect SOH reading.
If the above are not recommended, would increasing the Near Full parameter to ensure qualified discharges while charging to a lower voltage result in accurate SOC? I.e. would it show their fully charged cell at ~90% rather than update FCC as the lower capacity and show a correct SOH?
Thanks,
Antonio
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BQ24070: Problem with capacitor between BAT and ISET1
Part Number:BQ24070
Hello Team,
Could you help us please with our customer's question:
The customer has BQ24070 in new design of automotive GPS Tracker.
After their Tracker is turned on in the presence of a battery(which BQ24070 tries to charge), a loud squeak appears. Sound like a mosquito flying.
They found out that if the capacitor between BAT and ISET1 removed, the squeak disappears. It also disappears when the battery is pulled out of the device.
In the datasheet there are 2 references to this capacitor:
1) 0.22-μF capacitor connected between BAT and ISET1 is recommended to improve operation at low charge currents.
2) In description of BQ24070EVM: C7 is not installed. May be needed for programmed charging currents less than 0.3A.
In this case their needed charge current is 0.16 A. Which is lower than 0.3A. So they should use this capacitor.
How to solve problem with loud squeak?
BR,
Ilya
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UCC27712 inverter use
Hello Team,
My customer is asking if there anything special to take into account if using UCC27712 as inverter.
This application is mentioned in the Datasheet, but the question is if there is anything that could be a problem?
thanks and regards
Adrian
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TPS43351EVM: Sub-harmonic oscillation at high low and high VIN for 3.3V, 5A output
Part Number:TPS43351EVM
Hi Again,
I'm asking this question now because I wanted to be sure that frequency synchronization issues were not at fault. Now that those are resolved, I have the same circuit, now the output #4, Gordion has the complete schematics. For VIN above 12.0V and Iout above 3.5A, I see a progressively worse sub-harmonic osculation in the switch node duty cycle. Increasing VIN and/or Iout make this oscillation more and more pronounced.
Ch.2 = Iout, Ch.4 = SW node, this is for VIN = 13.8V and Iout = 5A (max load)
My first post about this IC led to two changes with the first TPS43351-Q1 on the board, those were to remove the resistor that connected the other output which is 5.0V to the EXTSUP pin and to increase the VREG pin capacitance to 4.7 uF. I have made those two changes to the second TPS43351 that generates this 3.3V, 5A output, but neither has stopped the oscillation.
In addition, I found that if I tried to start up into a load higher than 3.5A (constant current load), either by applying input power or by using the logic enable, the output would get stuck with a voltage of around 0.8V and delivering those 3.5A of average current. Here''s a plot of such a startup:
Ch.1 = VIN, Ch.2 = Iout, Ch.3 = ENA and ENB pins, Ch.4 = Vout
The solution to this was to lower the current sense resistance. In order to get a fairly smooth, monotonic startup, I had to reduce the current sense resistance to 2.5 mohm from its original 5 mohm. This caused some changes to the gain-phase response, so I also adjusted the control loop compensation. This is conservative but very stable:
Before there was some confusion about the phase margin - this is read directly, and is reported at the bottom: 75º at 8.3 kHz BW. This is with VIN = 13.8V and Iout = 3.0A. Above 3.5A the Bode plots are just noise.
I have ruled out power supply impedance interaction at the input, mainly because this instability actually gets better as VIN drops - the opposite of what you would see if the input impedance was causing problems. And I've ruled out low phase margin or gain margin in the control loop. I don't really want to lower the current sense resistance further because I'm worried about signal-to-noise ratio. What else could cause the sub-harmonic oscillation?
Thanks,
Chris
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TPS54361: TPS54361
Part Number:TPS54361
Hi,
I Have selected TPS54361DPRR switching regulator for our design in one of our project to convert from 48V to 12V and 48V to 5V,
Attached is the schematic of the same,
Please go through with design and kindly share your review comments on them.
Thanks
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BQ76PL455A-Q1: V5VAO use
Part Number:BQ76PL455A-Q1
According to datasheet, I should not use V5VAO from the BQ for external circuits. Would it be acceptable to generate the wake pulse with this supply ?
Regards,
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TPS63060: number of terminals connected to exposed thermal pad for WSON-package
Part Number:TPS63060
Dear TI-Engineers, In the TPS63060 datasheet (SLVSA92B -DECEMBER 2011 –REVISED DECEMBER 2014), I am confused by the information for the exposed thermal pad and the number of terminals connected on the WSON-package. The illustrations on PDF page 3, 21 and 27 indicates four terminals (2x2) connected to the exposed thermal pad. The illustrations on PDF page 28, 29 and 30 indicates eight terminals (2x4) connected to the exposed thermal pad. Why having eight terminals on the PCB footprint if only four of them are actually being used?
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BQ25570: Buck Regulator Always Active
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UCC2580-1: min slew rate of VDD pin
Part Number:UCC2580-1
Dear all,
one of my AA is using the UCC2580-1 in avionic application. The device works fine, according to the MIL-704 which considers only fast ramp on the Input voltage supply and so on VDD.
The designers are tryng to qualify the same board according to the DO160 which has a different ramp conditions (see below):
The voltage supply and so the VDD has to go below 9V at this point the voltage rises with a 0.30V/s for 35s.
Even if the input voltage supply rises, the UCC2580-1 does not start working.
Are there any constraints on the slew rate of VDD signal ?
regards,
Domenico
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TPS62135: Unexpected behavior at output.
Part Number:TPS62135
Hi!
Attached is a design,layout and schematics of a buck converter(TPS62135) whose output is 4.2V (for input voltage of 12V). We used the same capacitors and resistors suggested by wbench design attached below. The only changes were that the 499K resistor was of 499K 1/16 W, 0402 package (but in the next design we will use a 1/5W resistor of the same package). We get 11.8V at the output, way above the desired value (which is 4.2V). We are clueless as to what is causing this rise in output volage. Also the attached design worked for us intially but failed later on. Can you please go through and help us out. Thanks in advance.
(Please visit the site to view this file)
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BQ40Z50-R1: Sample Filter Settings
Part Number:BQ40Z50-R1
Hi,
We upgraded an existent 3S-2P Li-Ion battery pack based on the old BQ2063 (coupled with an S-8243 protector) with the BQ40Z50-R1.
Our customer uses a charger which interrupts the charging current approximately 1s every 30 seconds to communicate with the battery. This current interruption is necessary to be able to communicate with the battery as SMBus communication lines are multiplexed with the charger power lines in the host system.
During this communication, the charger asks for the battery voltage to adjust its CV setting to compensate for voltage drop in wiring due to 5A charging current. For this compensation to be effective, the battery voltage needs to be measured under current.
The BQ2063 update voltage data every 2-2.2 seconds so the short current interruption have quite no effect on the battery voltage sent by the BQ2063 which is representative of the battery voltage with current.
However the BQ40Z50 updates voltage data more rapidly every 0.25 second so during the current interruption, the voltage sent to the charger is the battery voltage with no current. As this voltage is lower, the CV setting compensation of the chargeris too high leading to overvoltage events.
Old batteries and charger are always used so our customer would like to find a workaround on the new battery to be compatible with the particular operating mode of this charger.
On page 239 of TRM (SLUUBC1D–July 2015–Revised January 2018), the table B-1 shows filter settings with associated time constant but unfortunately, we can't find these settings in the calibration section of the Data Flash parameters so we have several questions :
- Where are these parameters ?
- What is the default value setting currently (supposed to be 10/0.25s) ?
- Is it possible to change these thresholds ?
- Does the modification of these parameters has undesirable effects (if so which ones) ?
Thank you for your support.
Best regards.
Stephane
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LMZ20502: STEP Model?
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