Part Number:BQ27542-G1
Hello，Sir，
There is something confused me，As the picture below，
1,what‘s the functions about those CHECKSUM：STATIC_CHEM_CHKSUM / ALL_DF_CHKSUM / STATIC_DF_CHKSUM .
2,what data was used to calculate those CHECKSUM? and how should I know the Gauge hold the correct CHECKSUM as my expected? and What's the algorithm for them?
is there any more detailed documents about this, please kindly help on this. thanks in advance.
Part Number:TPS562231
Dear Team,
What is the suitable solution for 12Vin to 3.3V/2A with isolation?
Only flyback can provide the isolation here? Or we have easier solution here?
Br
Kevin
Part Number:LM25141-Q1
Dear,
The customer has two questions:
1, when set FMOD, what rules can I refer to?
±5%, Does it means Nominal Frequency, or , Voltage Value of DITH Pin?
the modulation rate must be less than the oscillator frequency. Is there a minimum limit?
2, EVM user's Guide. Figure 12. EVM Schematic 2.2 MHz. The red circle shown in the following figure.
What is the effect of RC network?
Thanks .
Wade
Hi,
I am looking for a LED driver to driver BL (3-4 LED in parallel). I have the BL with working voltage of is 3.2V and current drawn from the BL is 30mA. The BL driver should have PWM interface to control the brightness. The input voltage for the driver should be greater than 16V.
Thanks,
Sreekanth
Part Number:BQ33100
Hi,
I am trying to manage 4 capacitors with a bq33100. Nothing charges when I put power on, even if I'm using the circuit page 54 of the datasheet (not the same charger though) adapted to 4 capa following specfifications page 13. So I thought I must set the device in 4 capacitors mode. I saw that a fresh device should be in 4 capa mode, but also that defaut mode is 3.
I communicate with bq33100 through a PIC24 via SM bus but I can't read Data flash. I assume it's because the device is sealed, but I haven't found the key (0x60 cmd only give me the result of the last command). Is there a default unseal key I should use ? Also, if the device goes under reset, will it be in Unseal Mode ?
Thanks for your help,
B. F.
Part Number:TPS3813
Hello,
I am Akshay Pathak working as an Embedded Hardware Engineer in Teksun Microsys Pvt. Ltd. I am using Watchdog Timer IC part no. TPS3813K33DBVR in one of my application and I need some clarity for the Schematic that I am working on.
I have attached image file of my Schematic for the Watchdog Timer portion.
In the application I need to set the Timer window of 2 sec and for that I have set the schematic as per the above image. So, kindly review it and Give us more information if you think that this will not be enough for Watchdog Timer IC to work properly.
Kindly let me know if you need more information for the same.
Thanks&Regards
Akshay Pathak
Part Number:BQ27010
Hi Team,
i have customer is the old design and continue to order, but the customer is ordering BQ27010DRKRG4,
we want to know BQ27010DRKRG4 and BQ27010DRKR is the same?
Part Number:TPS43060
Dear Forum,
I'm trying to create a synchronous boost converter using the TPS43060 chip.
Here is my issue. I have run through Web Bench and (to my surprise after many foiled attempts to reach this goal with other chips) it does allow me to have the following:
Vin 20v min
Vout 53v
Iout 20a
Freq 540khZ (courtesy of WebBench)
So far so good.. but Web Bench says "Cannot find mosfets from the available database, so ideal mosfets have been used"
My next step is... "Can I parallel 2 mosfets at each point?".... Clearly, from my reading, the critical issue for this idea is the Cgs which has to be very very low for this type of converter. and gate source/sink current capacity of the drivers.
Though I've not seen any designs using parallel mosfets for synchronous boost converters, could one of the experts advise me of the feasibility of doing that in order to obtain the power needed?
I have found a FET which seems to have good potential, if used alone (single) but while it's Rds is just 1.5mR it's Cgs is 168nC.
If I used such a FET (supposedly optimized for Synchronous rectifier converters) would this Cgs cause me insurmountable problems and perhaps over heating of the 43060 drivers or just unacceptable switching losses. (I can use a bigger inductor with a lower frequency if that helps) ..
My choke is at present an ETD49 with a 1mm gap, but I might need to move to a large soft iron toroid to have a lower AL to achieve the needed L . (1mm Gap on ETD49 gives Al of 300nH but with the Web Bench design saying I need 1.5uH for the choke... (540khz)
Guidance is welcome.
Julian
Part Number:TPS7A91
Hi ,
I am planning to use TPS7a91 in our design. TPS7a91 is used in the design to power the FPGA rail.
There are 1000uf decaps in the core rail which appears at the output of LDO volatge rail. i would like to simulate the inrush current.
Please share the transient schematics of TPS7A91.
Thanks,
Divya
Hi There,
I have designed power supply based on Ucc28064 and Ucc256301 ic based in TIDA-010015 model. It is 600W power supply and need some input on choosing these filter components. But i want to get feedback based on the component values choosed in the circuit. Corresponding values are for you reference.
Input- 85 to 265VAC
PFC circuit switching frequency minimum -40KHz
Efficiency expected- 94.5%
PF expected- 0.99
input current-7.6A
Please advise the selected components are good with respect to EMI/EMC . This components are used here for common mode and differential mode filter as per my knowledge.
C6 formula used
Cf= half of c6= 1uF
Any advise/suggestion would be appreciated.
Part Number:TPS7A4501-SP
In datasheet SLVSC31D (Revision Aug-2015) in §7.1 the Abs Max Junction Temperature is spec'd as 150°C. In §11.3, it says 125°C, and so does MILSMD5962-12224, Rev.D.
Now, 125°C is not so nice because it needs to be derated by 40°C (per ESA Standard ECSS‐Q‐ST‐30‐11C), which limits the operating junction temperature to 85°C.
Q: What is the correct value for the Absolute Maximum Junction Temperature?
Part Number:TPS544C20
Hello experts,
I have a question. Is there any leakage current (internal leakage current path) at a following pins if VIN and VDD do not apply and applied a voltage (less than ABS) to a following pins?
[TPS544B20 and TPS544C20]
- 1pin CTRL
- 4pin DATA
- 5pin CLK
- 36pin PGOOD
Best Regards,
Fujiwara
Part Number:LM3481
HI,
I am using LM3481 in a design,where input is 6-11V, and output is 13.5V,
but i am facing a issue when i testing it .short circuit protection is not working .when short circuit occur at is out ,its MOSFET Q4 burn .please suggest how can i resolve this issue.
I have attached the circuit of this section.
Part Number:BQ77915
Hii Sir
We are intending to use the bq77915 IC for cell balancing in the battery pack.
as mentioned in the datasheet of the bq77915 in the detailed design application page. for 18V pack they are used s series cells for the Nominal Voltage of 3.6V for this configuration how the IC will provide the Over Voltage protection and cell balancing features.
please suggest us can we get a Li-ion cell of 4.2V OR the cell is available only for 3.7V Nominal
if we used the 3.7V Nominal and 4.2 Charge voltage cell how the IC will provide the over voltage protection
Part Number:TPS92515HV
Hello,
we're experimenting an issue with 10KHz PWM signal: if it goes to 0% we are not able to get a good output switching signal any more.
The datasheet says (www.ti.com/.../tps92515-q1.pdf, page 19):
"[...] if the PWM ON-time is shorter than the converter natural demanded ON-time, the PWM signal itself becomes the control signal for the high-side switch. The PWM pin activates a weak pulldown, as shown in Figure 25. Because the PWM pin is also UVLO (undervoltage lockout and device enable), when pulled low it is necessary to ensure the output is 100% OFF"
In our application there's a a spurious signal (that cannot be removed) on SW pin that come from the load. We observe that when the spurious signal goes over 8V with PWM duty cycle 0% something happens: we suppose that the "weak pulldown" is turned on, in this specific condition the regulator doesn't work, even if the PWM duty cycle goes to 100%.
The regulator start working normally only if we reduce the spurious signal (<8V).
Obviously during normal activity we cannot control the spurious signal.
Is this behaviour expected? How can we solve this issue?
Best Regards,
Daniele
Part Number:BQ4050
Hi,
I plan to use bq4050 with the charger bq24105.
In the technical reference - SLUUAQ3, in the section 4.4 (page 30), the charging current can be configured.
So i dont understand, the bq4050 can be used as a linear charger? in this case there is no need in external charger?
Please explain me that.
Best Regards,
Arkadi
Part Number:BQ78350-R1
78350 is having capability to drive bq76940 chip using i2c bus? How about balancing algorithm, is it in built in 78350 and how about protections?
Part Number:TPS62163
Hi team,
I see there is a Initial output voltage accuracy data in the datasheet. I'm not very sure what the data mean here. Is it the accuracy of the internal reference voltage?
