Part Number:BQ78350-R1
HI Sir
Below is our system block diagram will use BQ78350 + MSP430
Does TI have MSP430 reference code ? and used with BQ78350
Thanks
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BQ78350-R1: BQ78350-R1 + MSP430
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BQ40Z60: SOC & SOH & Coulomb Counting
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BQ24650: Setting V_refcharge for LiFePO4 Battery
Part Number:BQ24650
Hello,
I need to build a solar charger for a LiFePO4 battery.
The requirements are to support 4,5,6 and 7 cells batteries.
Consulting the app note SLUA565 (Using the bq24650 to Charge LiFePO4 Battery), it is explained how to add a resistor in parallel to R23 (R15 in the app note) to reduce V_refcharge to 3.4V for example, however this app note address only 1 cell battery.
In order to support 4 to 7 cells, I need to do the following:
1. Change R22 (R13 in the app note) for each battery type assuming R23 (R15 in the app note) is constant.
So in my design, if R23 is 100K than for 5 cell R22 will be 757K and for 6 cells 928K and so on right?
2. Set the parallel resistor accordingly, 3M ohm looks like the correct value.
3. MOSFET - in this solution the gate of the MOSFET is connected to STAT2. Vsys in my design can be 28V so it will burn the gate. I see no reference to that in the app note. Will a zener diode make sense or am I missing something here?
Thanks,
Tomer
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BQ34110: Help in Configuring Basic Gauge Parameters
Part Number:BQ34110
Hi Team TI,
I'm working with a BQ34110 to monitor a 6000mAh 12.8v LiFePO4 battery pack. The pack contains 4 cells in total and They are configured as 4 series cells. I am using bqstudio and EV2400 to communicate.
The problem we are having in configuring the gauge to correctly monitor the remaining capacity and the Relative State of Charge(SOC). I have set up the Voltage Divider parameter, calibrated the voltage and current, and I am getting accurate readings for both Current and Voltage from the battery pack.
Q1. In bqstudio Design Capacity and Full Charge capacity is set to Default Value of 2200mAH. I need to change that to 6000mAH. Please suggest me how to configure these parameters.?
Q2. Also, Suggest me which are the other parameters I need to configure to get the accurate SOC.
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TPS22976: Ron specification
Part Number:TPS22976
TPS22976 support team
The below is the On-state resistance of TPS22976.
I have three request of Ron specification as follows.
- What is MIN / TYP value of Ron when Vin=5V and 3.3V?
- How unbalanced is Ron between channels?
- Can you provide me with PSpise model that Rds between channels is configured the maximum unbalanced to simulate using TINA-TI or Allegro?
Regards,
Tamio
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TPS61193-Q1: Audible Noise from Inductor
Part Number:TPS61193-Q1
Hi
We are using TPS61193 part in one of design for Gauge illumination and TFT backlight section.
Hearing Audible noise in below ranges:
Gauge illumination inductor from VIN - 13.2V to 13.6V (Non-Shielded type inductor)
TFT illumination backlight inductor from VIN - 16.5V to 16.8V, (Using Shielded type Inductor)
Design operating range is Vin = 6V to 18V.
Findings:
1. Below is schematic image, used 1 x 47uF(electrolyte Cap) & 2 x 10uF(Ceramic Cap) and I changed the ceramic cap (C911 & C912) to 22uF and still hear audible noise.
2. I removed the 2x10uF(Ceramic cap) and audible noise is completely reduced, But TPS61193-Q1 datasheet recommend to use Ceramic cap in Note A and whereas in Note B recommend to use physical size ceramic cap should be minimized.
Query:
1. What will impact if i remove the ceramic cap ?. Since product in final stage and not in place to change the inductor to shielded type from Non-shielded type
2. Without removing capacitor, what would be TI recommendation to isolate the audible noise.
Note A:
Note B:
Thanks and Regards
Balakrishnan
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TPS57060-Q1: Switching frequency tolerance
Part Number:TPS57060-Q1
Hello Team,
we need more detailed description about the internal switching frequency tolerance of our part:
In our datasheet there is a range of 450 to 720kHz for Vin=12V and RT=200kOhm.
Is this including a resistor tolerance? and which value?
What about the complete Vin range of the device? Is there also a change?
There is also a chart available about junction temperature but only for Vi=12V and RT=200k. What about deviation across Vin and RT?
Many Thanks
Josef
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BQ24650: How many V lead-acid batteries can bq24650 charge
Part Number:BQ24650
Hello,
I have a project to charge 24V lead-acid batteries. I am not sure whether BQ24650 can meet my needs. I watched the process of lead-acid charging. When the overvoltage of lead-acid batteries is 29V in the process of overvoltage charging, I hesitated a little whether BQ24650 can meet my needs. If not, can you recommend other charging chips that can charge 24V lead-acid batteries?
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BQ28Z610: read registers via I2C?
Part Number:BQ28Z610
Team,
Are there ways to read the BQ28Z610 registers to identify which "system level protection" have kicked in?
For example can BQstudio + EV2300 / EV2400 be used for that? Or do you need an external MCU board to run customer SW to access I2C?
Are the some guidelines on how to debug problems during developments?
The actual problem manifest itself with the BQ28Z610 that open/close the FET at a 25ms rate that make the pack voltage level oscillating between 3.8 and 4.2V:
Thanks in advance,
A.
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UCC28780EVM-002: CAD files
Part Number:UCC28780EVM-002
Team,
can you please provide CAD files for UCC28780EVM-002?
Thanks for your help.
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BQ40Z50: Problems communicating with NI 8451 and Labview
Part Number:BQ40Z50
Hello,
We are currently using the BQ40z50 chipset in one of our smart battery packs, and are developing several new packs which will use that same chipset.
We built a labview based test system to electrically test and verify communications and certain data fields in our smart batteries. We are using a national instruments usb8451 for the system communications to the battery pack.
We have encountered a problem with this setup that we cannot figure out. We test the 20z75 and the 34z100 without any problems.
When we test the packs using the 40z50, it causes the usb8451 to "lock" up and the labview test environment to crash. These crashes will happen about every 3 to 4 packs we try to communicate with.
We are at a loss to why this is occurring and need help solving it.
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BATTERY BOOST CONVERTER GSM/GPRS APPLICATION
There is some way to reduce the inrush current of the converter TPS61230A?
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LMZ35003: Multiple Output voltages?
Part Number:LMZ35003
I'm looking at the datasheet for the LMz35003.
The Vout pin descriptions say the following
| VOUT |
| Output voltage. These pins are connected to the internal output inductor. Connect these pins to the output load and connect external bypass capacitors between these pins and PGND. Connect a resistor from these pins to VADJ to set the output voltage. |
If we connect the different Vout and VADJ pins with different Rset values in parallel, can we get different Vout voltage values?
So for example, if we connect Vout pin 10 with a 52.3KΩ to VADJ and Vout pin 11 to a 175KΩ ohm to VADJ,
Can we get both a 5V and 15V output?
My guess is it's not possible. Just thought I'd double check.
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LM3644: Pls. help to give some advice to enhance the lightness.
Part Number:LM3644
Dears:
Pls. help to give some advice to enhance the lightness.
From the below code and schematic, only under torch mode LM3644 can drive the LED lighting(HWEN and STROBE are high level and ignore the signal of TORCH/TX connecting with CPU) , however, the lightness is not enough.
lm3644_write_register(0x05, 0xbf);
lm3644_write_register(0x06, 0xbf);
lm3644_write_register(0x01, 0x2b);
Btw, from the datasheet I can see the Brightness level under Flash mode is higher than under Toch Mode.
And the time-out is only 400ms under Flash mode.
Can LM3644 drive the LED is always bright under Flash mode?
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BQ76200: BQ76200
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LM3481: spec of transformer used in PMP20981
Part Number:LM3481
Hi,
i'm looking for transformer spec designed on TI ref design http://www.ti.com/tool/PMP20981.
based on the BOM, part# PA4191NL (Pulse Engineering) => not found on the web nor Pulse website
Can you share the spec of transformer ? my customer would like to design isolated flyback 12V up to 48V for PoE PSE application (15W). TI design is good fit but now they need further information on the BOM to estimate total cost before moving forward.
thanks for your help
Paul
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BQ4050: Memory Mapping in SREC file
Part Number:BQ4050
Hi,
We've written some firmware to flash the BQ4050 from our board's main processor using the SREC file dumped from a master BQ4050 with BQStudio.
All is well except for the region 0x5F80-0x5FFE, which does not write. This region of flash is not (or does not appear to be) documented for any purpose in the BQ4050 TRM, so we were wondering what this was, and if it is safe to ignore this part of the image.
Similarly, the SREC file contains data addressed from 0x100000 to 0x10DFFF. We don't know what this is for either, but we presume this is either RAM or Program Flash, and, therefore, does not have to be flashed back to production targets. Ditto 0x140000-001401FF. Can you confirm that we do not have to copy this to our production targets?
Thank you.
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UCC27714: UCC27714
Part Number:UCC27714
Hi Richard Herring,
We are using UCC27714 in Two-Transistor Forward Converter topology. We have used the circuit from tidrti6.pdf and attached the one which we have used.
We are observing two issues with UCC27714
1) That the UCC27714 is getting hot when used to drive Two-Transistor Forward Converter mosfet at 400V DC
2) That the mosfet Q1 and Q2 in DL1826-GATE DRIVER BASED ON UCC27714.pdf got hot used to drive Two-Transistor Forward Converter mosfet at 400V DC
3) We are unable to see PWM signal on CRO at HO and HS while signal between LO and COM is observed to drive Two-Transistor Forward Converter mosfet at 400V DC.
4) Please suggest which circuit we should for Two-Transistor Forward Converter topology. with components and parts numbers.
Thanks and Best Regards,
VK Verma
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BQ27Z561EVM-011: Device doesn't work.
Part Number:BQ27Z561EVM-011
Hi,
I am currently working on BQ27Z561EVM with BQ27GDK000EVM. I followed the user manual to connect all the components as shown below:
It works fine until this morning. Yesterday evening, I started an experiment which in theory should finish at 2:30 pm today. However, when I came to check the experiment at around 1 pm today. I found in bqStudio, the icon of battery gauge was gray which means the battery gauge is not detected. Then I checked the instruments, the battery gauge and the GDK. It seems that there is no problem on GDK. But on the battery gauge I found something strange that the PWR LED is on as shown in following picture, which means the gauge is powered on. Normally, that LED should not be on when the battery gauge is connected to GDK. Then I test the battery gauge separately by connecting it directly to my PC. My pc is able to recognise there is EV2400 connected, However, bqStudio still cannot detect BQ27Z561EVM. I tried to find where the problem is and make it work for several hours. While, till now, it still does not work.
Could you give any idea or advise to find the problem? If you need any further information, just tell me.
Just one more sentence that system works well for almost one month. During that period, the system was kept in a safe place and all the connections were fixed.
Kindly regards,
Wenlong
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BQ25713B: Configuration/Typical Application when not using Power Path Feature
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