Part Number: BQ40Z80EVM-020
why is the battery SOC always 100%
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BQ40Z80EVM-020: Why is the battery SOC always 100%
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TPS2544: Current Limit in CDP Mode
Part Number: TPS2544
Hi,
Will TPS2544 work in CDP mode if ILIM_HI is configured for less than 1.5A (say 900mA)? The datasheet mentions a fault condition for overcurrent conditions (the case of a device trying to draw more than the current limit), but then also mentions a deglitch circuit.
Thank you.
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LMR14050-Q1: Request worst case Leakage current at FB pin.
Part Number: LMR14050-Q1
Could you provide the worst case leakage current at the FB pin at -40C and +85C for this device: LMR14050SQDDARQ1? Thank you.
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TPSM84209: TPSM84209 vs TPS54302 for low ripple especially in ECO mode
Part Number: TPSM84209
Hello, I have been using the TPS54302, but finding in the skip/ECO mode (<0.5 A), the ripple is larger than I'd like. Would the TPSM84209 perform better? I do like the lower BOM count on the TPSM84209. Any other pro/cons to consider in comparing these devices?
Vin 14-18V
Vout 5V
Use ranges anywhere between 200mA to 1.25A.
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BQ25150EVM: Interrupt not generate on /MR press (pull low)
Part Number: BQ25150EVM
Hi ,
I want to generate wakeup1 & wakeup2 interrupt by /MR pin low.
Code logic :
1. mask all interrupts.
2. mask MRWAKE1_TIMEOUT & MRWAKE1_TIMEOUT
3. pull /MR line low & wait for this flag,
But flag not generate(interrupt not occurs) after 125/500 ms on /INT pin
-> mode : adapter(VIN present)
why ??
/ Akshay P
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BQ24171: On/Off controller
Part Number: BQ24171
Hi,
We are designing with BQ24171 and are interested in battery savings during light load conditions and extending the lifetime. Is there some way to interface this device to disconnect the battery during light load conditions? It would be great if we could do this without an external on/off controller and perhaps interface this to work with a button press. Appreciate your help with this.
Regards,
Garret
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TPS62140: QFN solder reliability
Part Number: TPS62140
Do we have any information or data that compares the solder reliability of the QFN package device to a leaded alternative such as SOT23?
This is more of a general package question but this came up when comparing the TPS62140 to some alternatives in SOT packages. I have looked at the SMT package App Notes in the quality area of ti.com but don't see any comparison data.
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TPS2350: TPS2350
Part Number: TPS2350
Hello
I have one question regarding TPS2350.
PFA schematic for the same.
My question is we have placed 10K resistor at load R25 in the schematic, can you please let us know if that is required. We are connecting another load at the output.
Regards
Akash
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LM340: PCB Heat sinking Help
Part Number: LM340
I need a 5V, 300 ma from a 24 VDC supply on a PCB. I am confused about PD calculations and theta jA. I am calculating PD as (24-5) x .3A = 5.7 W. Fig 32 0n LM340 data sheet shows max PD vs ambient when mounted on 1 sq in of 2 oz copper and the max wattage is 3.2 W and that is at negative ambient temps.. Less than 2W if the ambient is 25C. How can I get the current I need when the max power is so low. I know I must be looking at this wrong. Can someone help me understand please?
Thanks - John
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LM5145: Capacitive Load Capabilities
Part Number: LM5145
I'm planning on using the LM5145 as my input buck step-down supply from 40V-60V input to 12V output at 6.5A. Following this I have several buck regulators generating the various voltage rails needed for my design. each on of those step-down bucks have input caps. Heaviest of the rails is 0.9V output at 35A.
My question is can the LM5154 function with a large capacitive load? I've seen regulators function fine until a large capacitive load is applied, then not be able to come up when power is applied.
Thanks,
-j
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LM5104: Driving parallel mosfets
Part Number: LM5104
Hi,
I would like to use three LM5104's to drive mosfets in parallel for a three-phase inverter.
If using individual gate resistors, is it suitable or would there be other precautions. For example is it possible the adaptive delay circuitry would have unintended side effects with parallel mosfets?
Thanks,
Andrew
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TPS715A: Technical details
Part Number: TPS715A
How much current can the low-side FET (leakage null control circuit) sink? Is there a current limit or saturation level?
2. Using the unencrypted PSpice model, when VIN > VOUT, and an external source drives current into the VOUT node, the IOUT is negative (current flow into OUT pin), the I_IN is also negative (current flow out of IN pin). Is it the correct behavior? How is it possible?
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LM4041A12: TINA TI Component Dissipation
Part Number: LM4041A12
Is there a quick way to look at component dissipation within a TINA TI simulation?
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LMR62014: Controlling Turn on Rate
Part Number: LMR62014
Hello,
Is it possible to control the turn-on rate (soft start)? I have a customer using the SHDN pin to enable it, but this causes a fairly large inrush current at turn on.
Any input is appreciated!
Thanks,
Jack
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UCC256404: Optimum VCC generation and value for UCC256404
Part Number: UCC256404
In reference to the PMP22087 reference design, I notice that the UCC256404 VCC is powered from a zener controlled linear regulator at ~20VDC. In the data sheet, most of the typical plots have VCC listed at 15VDC.
1. Why was a 24VDC winding used to create a ~20V supply to power VCC on the UCC256404 instead of providing it with a 15VDC supply?
2. Is a regulated supply required the VCC net? Why not use a Aux winding at 16V followed by a diode or a low cost bridge rectifier followed by a capacitor (or RC Network) instead?
3. If regulation is required, why not use a TLV760 with fixed 15V output following the rectifier stage?
Thanks in advance,
Cody
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BQ24610: BQ24610 the charging light is on, but the current is 0
Part Number: BQ24610
Hi
Recently, we are using BQ24610 for 6 series of lithium batteries, full charge voltage is 25.2V and input voltage is 28V.
When connected to 28V voltage, PG lamp is always on. When not connected to battery, the voltage at each point is: VIN=28V;VTTC = 1.24 V.VTS = 1.48 V.VPH = 27.24 V.VREF = 3.29 V.VREGN = 5.96 V.VISET1 = 0.3 V.VISET2 = 0.3 V.VACSET = 0.4 V.VFB = 2.26 V.
The battery voltage is 24.3v. When the battery is connected, the charging lamp will be on. The voltage at each point is VIN=28V.VTTC = 1.0 V.VTS = 1.48 V.VPH = 24.3 V.VREF = 3.29 V.VREGN = 5.96 V.VISET1 = 0.3 V.VISET2 = 0.3 V.VACSET = 0.4 V.VFB = 2.018 V. The total current of VIN is only 40mA
When the battery is plugged in and the charging light is on for less than 2 minutes or less, it will automatically turn off. At this point, I touch the BQ24610 chip and the temperature is very high. After that, only PG light is always on.
PS: JE06 is not used. Its positive pole has been connected to the positive pole of JE07
PH waveform
LODRV waveform
Waiting for your reply
Thanks
Star
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BQ40Z80EVM-020: Why is the PDSG function of pin20 connected to J2 Pin1 in EVM
Part Number: BQ40Z80EVM-020
In this case, we know that pin20 is an exception:
https://e2e.ti.com/support/power-management/f/196/t/853005
So why is the PDSG function of pin20 connected to J2 Pin1 in EVM?Is it a mistake? Do I need my own Flywire to connect pin20 to R16 when I use it?
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LM5180EVM-S05: Why no ground pour or traces under transformer?
Part Number: LM5180EVM-S05
Hi, I'm laying out a virtual copy of the EVM board and wanted to ask why there is no top copper under the transformer? I assume it is to reduce noise coupling into the ground or traces, but there is still a ground on the bottom of the board which is only 1.6mm away, which would pretty much negate any gains made by removing the top copper???
Also the EVM has a 1nF cap bridgeing the primary and secondary grounds. No mention of it in the data sheet. ??
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TPS7A8300: Charge pump input circuit?
Part Number: TPS7A8300
Hi team,
My customer used TPS7A8300 and curious about that how the switch circuit between IN and BIAS works? Can you please help provide more detailed materials?
And what is the priority of the charge pump input if both can meet requirements? How does the shift time of these two inputs? Is there any delay data? Thanks.
BR,
Rory
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TPS54824: 12V to 5V efficiency
Part Number: TPS54824
Hi team,
My customer asked about TPS54824 12V to 5V efficiency curve? Can you please help work out one? thanks a lot!
BR,
Rory
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