Part Number:TPS2121
Hello Ti,
I am designing a 2-input power mux circuit. I am studying the datasheet but I am confused on something.
This is the photo I captured from the EVM user manual (Pg. 9 of http://www.ti.com/lit/ug/slvubd2/slvubd2.pdf
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TPS2121: Questions related to datasheet
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TPS7A47: Reverse current protection schottky spec
Part Number:TPS7A47
I think TPS7A4701 require reverse current protection schottky diode if Vout voltage level becomes higher than Vin.
In this case, I would like to know required diode spec.
Is forward current spec over 1A is better because TPS7A47 rated current is 1A?
How should we select schottky diode?
Best Regards,
Kohei Sasaki
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BQ27GDK000EVM: discharge cutoff and term voltage
Part Number:BQ27GDK000EVM
Hi,
my customer's end equipment will turn off when battery is 3.3V.
They are using GDK for battery learning.
So how should we set discharge cutoff and term voltage? What's the difference between these two parameters?
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BQ76PL455A-Q1: internal resistance between Vsense1-2, 2-3..... 15-16
Part Number:BQ76PL455A-Q1
Dear Sir,
I have problem of internal between vsense of this BQ76PL455A-Q1 ADC input, when our PCB board there are no component only place this IC, if we measure resistance between Vsense sometimes the result good and sometime the result there are miss value on it, as our experience if on good condition we measure 1,8 M ohm on each resistance measurement of all this Vsense 1-2,2-3..... 15-16, but sometime we found inconsistency resistance measurement example Vsense 6-7 & 13-14 it measure around 0,7 M ohm (sometimes 1,2 Mohm or other value), and this makes ADC measurement error when we measure manually the voltage on Vsense it also not correct (hardware problem on IC of BQ76PL455A-Q1), please give me some advice regardless of this inconsistency (around 50%).
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TPS565201: Output bulk capacitance
Part Number:TPS565201
Hello,
I am modifying an existing design to incorporate a switching regulator instead of a linear. The existing design has a number of large electrolytic capacitors distributed across the board (almost 200000uF in total). I am trying to be as minimally invasive as possible with this design in order to avoid causing any unexpected issues, but I would be surprised if this amount of capacitance didn't lead to instability on the TPS565201.
The datasheet states that "The inductor and capacitor for the output filter must be selected so that the double pole of Equation 3 is located below the high frequency zero but close enough that the phase boost provided be the high frequency zero provides adequate phase margin for a stable circuit." It then suggests a maximum of 68 uF, which obviously I am well above. Is there a way to prevent this extra capacitance from affecting the regulator (perhaps an output LC filter)?
Additionally, I am concerned that this amount of capacitance will trip the short circuit detection on the regulator. The datasheet does not provide a maximum load capacitance to avoid this either. Presumably an LC filter would help here as well, but I am concerned this may cause other issues.
Thanks!
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TPS2379: May TPS2379 can replace MAX5981B?
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TPS62180: Why the output not delay?
Part Number:TPS62180
In my circuit, I generate 4.2 V from 12 V, but there is no time delay of 1 ms.
In the waveform, VIN <3.5 V, so I think UVLO is operating.
Therefore, I think that it will be output 1 ms later when VIN> 4.0 V, but there is no delay.
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BQ20Z45-R1: bq20z45-r1
Part Number:BQ20Z45-R1
Hello ti TI support team ,
I purchased bq20z45-r1 and i see on the top print side -->(first line: bqsnl8045 , second line:55TG4 , third line:CLY6) .
The bq SW recognize it correctly . Is it proper TI product because the name of IC printed not bq20z45-r1 on the top of the IC ?
B.R
Alex Burtakov
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TPS65177: VGL problem
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LM5145: Is Cilim not needed when the current limiter is in Rsense mode ?
Part Number:LM5145
Hello guys,
One of our customers is designed their new power supply using LM5145. They are going to use Rsense mode for the current limit function. According to the section 8.3.10
"Current Sensing and Overcurrent Protection (ILIM)" of lm5145 datasheet, the section says that "Given the large voltage swings of ILIM in RDS-ON mode, a capacitor
designated CILIM connected from ILIM to PGND is essential to the operation of the valley current limit circuit. Choose this capacitance such that the time constant
RILIM · CILIM is approximately 6 ns."
I undestood like that the Cilim is needed in RDS-ON mode because SW node transient speed from zero to negative current is very faster than Rsense mode.
Does this sentence mean that Cilim is not needed when the current limiter is in Rsense mode because Rsense voltage node transient speed from zero to negative current
is slow? Or is it better to prove Cilim part land pattern without Cilim mounting?
Your reply would be much appreciated.
Best regards,
Kazuya Nakai.
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TPS54160A: TPS54160A soft time
Part Number:TPS54160A
dear sir,
our customer meet TPS54160A Tss (Soft time) test result isn't match datasheet calculate formula。
for example:
Css=390nf, Tss should be =125ms, test result is 227ms,
if Css=470nf, Tss=150ms, test result is 251ms.
so customer want to know why these data is so big gap with theoretical calculate.
Tss 's definition from En is high to pgood signal is high, that's right?
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LP3878-ADJ: Input voltage range (VIN-MAX)
Part Number:LP3878-ADJ
Hello,
LP3878 (adjustable version) and LP3879 (fixed versions) seem to be very similar devices.
However, the LP3878 shows VIN up to 16V (understand Working voltage), while LP3879 shows VIN up to only 6V, with 16V only as "Absolute Maximum".
This is somewhat confusing.
What is the safe continuous working VIN range ?
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TPS2595: Clarification required on Overcurrent response of TPS259570
Part Number:TPS2595
With reference to the following webpage: http://www.ti.com/product/TPS2595, the'Overcurrent response' field of the TPS259570 device does not state that the device is 'Current Limiting', unlike all the other devices in the family. However I cannot find anything in the datasheet which suggests that this device does not offer over current protection. Is this an error in the webpage, or is this description correct?
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BQ27426: Alternating endianness
Part Number:BQ27426
I'm working with the device now, and would like some confirmation on the endianness. During configuration, we read, for instance, the current Design Capacity. Looking at the oscilloscope I can see it returns 0x053C. That would be 1340 in big-endian, which is a reasonable value. Next, I read the voltage using the standard command. This returns 900D, which in big-endian is 36877, which is clearly not a reasonable battery voltage. In little-endian, however, it is a reasonable 3472. These are two examples, but I have seen the same behaviour for the other parameters. So, is endianness in Data Memory big-endian and for standard commands little endian?↧
UCC256304: about multiple output on LLC topology
Part Number:UCC256304
Hello E2E,
Our customer is planning to design a 550-W AC/DC power supply unit.
I suggested the UCC256304 and UCC28056 or UCC28180 for primary side devices.
That power supply has 5-output, they are no-isolateed.
Customer's request is "5-output from 1-transformer".
Is it possible on LLC?
Regards,
ACGUY
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BQ77915: Can we change over voltage and under voltage thresholds in BQ77915.
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BQ77915: Can we change over voltage and under voltage thresholds in BQ77915.
Part Number:BQ77915
Can we change over voltage and under voltage thresholds in BQ77915.
If yes, then please suggest me whats the process.
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CCS/UCD3138: AD04 Analog Comparator How to continue Entry fast interrupt
Part Number:UCD3138
Tool/software: Code Composer Studio
Hello;
I want to use UCD3138 PIN AD04 Analog Comparator Entry fast interrupt.I set ACOMP_D_POL=1 and input voltage always highter than the ACOMP_D_THRESH.
But the program can't stop in fast interrupt.lt just into fast interrupt once time,then it never occur.
I shuold make the input voltage lower than ACOMP_D_THRESH and higher again, entry the fast interrupt one time.
How make while the input voltage always higher than the ACOMP_D_THRESH always touch off the fast interrupt .
Here are some of my code:
void init_AD04_F(void)
{
FaultMuxRegs.ACOMPCTRL0.bit.ACOMP_EN=1;
FaultMuxRegs.ACOMPCTRL1.bit.ACOMP_D_SEL=0;
FaultMuxRegs.ACOMPCTRL1.bit.ACOMP_D_INT_EN=1;
FaultMuxRegs.ACOMPCTRL1.bit.ACOMP_D_POL=1;
FaultMuxRegs.ACOMPCTRL1.bit.ACOMP_D_THRESH=127;
write_firqpr(CIMINT_ALL_FAULT_MUX);
write_reqmask(CIMINT_ALL_FAULT_MUX);
enable_interrupt();
enable_fast_interrupt();
}
void fast_interrupt(void)
{
k = FaultMuxRegs.FAULTMUXINTSTAT.bit.ACOMP_D;
}
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TPS65094: TPS650942
Part Number:TPS65094
Hello everyone,
For some devices, we found that TPS650942A0 (use for apollo lake) resets at temperatures between 0 and -10 ° C. when we dip PMIC, everything will be fine. However, when the temperature drops to -25 to -40 ° C, it becomes normal. Do you have an idea for this problem?
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LM74700-Q1: FET Driver Capability
Part Number:LM74700-Q1
Hi Team,
I have two questions about LM74700 FET driver capability as following.
- How much gate cap can LM74700 driver properly?
- Is it possible to drive 2 or more FETs in parallel?
Regards,
Takashi Onawa
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