Part Number: TPS62150
Hello,
We are planing to use TPS62150 in sleep mode system, When sleep mode, TPS62150 load current goes down around 20uA.
I look into the efficiency graph of datasheet but the minimum current is 100uA.
Vin is 5V, Vout is 3.3V. We would like to know the efficiency of around 20uA.
We look into TPS62147 but 2A requires bigger inductance. It is difficult to use.
It would be helpful if we can know the efficiency of TPS62150.
Best regards,
Toshihiro Watanabe
Part Number: TPS50601-SP
Hello Daniel,
Thanks you for the comments about table value of Iss and the Iss vs. temperature graph (pg.12, fig.10) – now I can use not absolute values of Iss but normalized values.
But I’m not agree with the idea about Tss growing with temperature decreasing.
Let’s make some speculations:
At -25C we will see:
Css = 0.9*Css (+25C), Vref can be not higher (see table), Iss = 0.95*Iss (+25C).
At the result we will have: 0.9*1/0.95 = 0.947 – so the multiplier for tss at -25C is less then “1” (in comparison of +25C) – so tss at -25C just CAN’T BE HIGHER then at +25C.
But in reality we see 60ms at -25C instead of 40ms at +25C…
Why is this?
And the last question: is our schematic good or you will recommend as to change something?
Part Number: TPS65132
We are using TPS65132WRVCT part in our design. We need input current (IIH and IIL) value and pin capacitance value for Enable pins(ENP and ENN).
Part Number: BQ51013B
Hello,
I would like to implement a wireless power transmission or have already implemented one, but am dissatisfied with the result.
I use the "bq5002EVM-648" board as transmitter and the "bq51013b" as receiver. As coil I use "760308141" from Würth. (I also tested "760308110" on both sides)
If I align both coils, then I can measure an output voltage at the receiver that fluctuates around and at 1.2V. Of course this is too low and I think I have to make a power adjustment to increase it.
I have set up the following circuit for the receiver side:
Which components do I have to change for a higher voltage? Unfortunately, the data sheet did not make me very smart, I know that R_ILIM limits the output current, right?
Thanks!
Part Number: BQ76930
hi,
we are testing the BQ7693003 in a thermal chamber.
when the temperature >40C, we start to observe negative spikes on the voltage of some channels (the cell voltages have been emulated with external supply, so very stable).
In particular, the channel 4 and 9 (blue and red) are interessed by this behavior.
Voltage applied to the cells are slightly different to avoid traces overlap.
Any clue on what might be the reason/root cause of such behavior?
thanks a lot in advance
PS: data are collected via ATE, reading the cell voltage any 5-6 seconds, while temperature is automatically changed in step every XX minutes or so. The plots shows the raw data as acquired.
KR
Vincenzo
Part Number: BQ25505
Hello.
Is BQ25505 compatible with a 9V battery for PRI_BAT ?
It is mentioned that the maximum voltage allowed is 5.5V. However, some users seem to have demonstrated that it works with 9V cells ?
Thank you!
Part Number: UCD3138
Tool/software: Code Composer Studio
Hi,
In one UCD3138 BUCK-BOOST application,I have problems in the dynamic actions of DPWM period and dutycycle swtiching.
Current swtiching procedure is as follows:
1.shut down PWM output
2.set LoopMuxRegs.PWMGLBPER
3.set LoopMuxRegs.FLTERKCOMPA.bit.KCOMP0
4.set other trigger points of period
5.set FlLTER output threshold
6.stop loop intergration(if need)
7.set output duty
8.delay 15 us
9.turn on PWM out
Because of the interruption of PWM,output voltage will be influenced during the switching procedure.
In STEP 8,if the delay time is shorted a little,it will lead to wrong output.So what delay time is suitable,and,what is the actual action procedure in the DPWM ? If there is any dependable opperation steps to make sure that the output is fast and correct?
Part Number: TPS22965-Q1
Hi Team,
Customer required TPS22965QWDSGRQ1 FIT as per IEC 62380 standard, which provides the die FIT, package FIT and the total FIT combined.
Can you please help on the same.
Regards, Shinu Mathew.
Part Number: LM5017
Dear Team,
We want to implement the soft start circuit here.
But we are not sure why the Vo is not stable.
Base on the waveform, the issue is Vcc didn't regulate at the voltage which defines on the datasheet.
Do you have any ideas what is the root cause?
BR
Kevin
Part Number: UCC27712
The case of the UCC27712 is a SOIC-8 with a 1.27mm grid dimension and a spacing
between the pads of 0.67mm maximimum.
So pin 6 ( HS) which is the drain of the lower mosfet is only 0,67mm away from pin 5,
which is the the gate of the lower mosfet, which is 16V away from source potential.
EN 61010 recommends 1.5 mm A&C for circuits supplied from 320V mains and CATII
Commonly used Mosfets as DPak recommend a PCB layout spacing of greater than 1.5mm between Source / Gate
and Drain connections for safety reasons.
In dirty environment or humidity the dimensions of the driver package could be critical.
A coating could be mandatory, finally driving the costs.
What are the basic ideas and proposals from TI?
Regards
Holger Tuerk
Part Number: REF3125
Hi Team,
Customer required REF3125AQDBZRQ1 & REF3112AQDBZRQ1 FIT as per IEC 62380 standard, which provides the die FIT, package FIT and the total FIT combined.
Can you please help on the same.
Regards, Shinu Mathew.
Part Number: CSD95472Q5MC
Hello,
Our customer has been trying CSD95472Q5MC + TPS53647 power design. Would you please provide CSD95472Q5MC recommended pattern layout.
best regards,
Part Number: LM5020
Hi Team,
Our customer is using LM5020. However, in the actual application, we found CS pin's voltage discharge very slowly. Please refer to the below waveform.
CH1: OUT; CH2: CS.
However, in our datasheet, we can see it has internal FET to ground for discharging.
1) Can you explain how the internal FET works? Why CS pin doesn't discharge the voltage when FET is off?
(As i understand, if CS triggered 0.5V, internal FET is connected to ground for 50ns and then turn off. After that, CS pin's voltage will be consumed by external cap slowly, correct?)
2) How to understand CS sink impedance?
Thanks!
BR
Marvin
Part Number: TPS51116
Dear Team,
Can this one use on DDR4 1.2V, VTT=0.6V?
I didn't find VTT=0.6V on the datasheet.
BR
Kevin
Part Number: TPS23758
We are currently taking the first steps with our own circuit design, based upon the recommendations of the TPS23758 data sheet, to replace an older LM5072 design in our devices within the next years.
The power consumption of our devices is rather constant in the range from 1W to 2.5W. Power is supplied via PoE or an auxiliary voltage in the range from 12 to 48V DC.
Basically the design works as we expected, only the regulation of the output voltage with varying input voltages is rather bad.
Unfortunately I miss a recommendation for the dimensioning of RVcc and especially of Ccc2 in the TPS23758 data sheet.
Is there a detailed explanation of the principle of the primary-side regulated flyback converter TPS23758?
Best regards
Klaus
Part Number: TPS548D22
Hi, Team,
Could you please check the attach waveform? Is there no problem?
It should be fine, but I need comments from BU...
Best Regards,
Satoshi Yone
Part Number: BQ78350-R1
Hello;
1. Just so I understand, the "hardware-based" protection mechanism is NOT within the 78350 itself, but is actually within the 769x0, correct?
3.6.2 Short Circuit in Discharge Protection
The devicehas a hardware-based short circuit in discharge protection with adjustable current and delay. See Section 3.1.4 for additional FET action options.
This register is representative of the bq769x0 PROTECT 1 register
2. Also, as I'm writing a driver for the 78350, my compiler alerted me to something else confusing: I note that many of the SBS commands are identical to the ManufacturerAccess() commands? Please explain the difference between sending 0x0060 to command 0 (ManufacturerAccess), and simply sending the command 0x60, listed in table 17.1.
Thanks!
Part Number: BQ76PL455A-Q1
Hi
May i confirmed the capacitor for OUT 1 pin ?
Datasheet page 119 mentioned A value of 390 pF provides best accuracy with a 60-µS ADC conversion period and 8× oversampling.
However at bq76PL455EVM and GUI User Guide ,P11 it said 2700pF. Which one is correct?
Part Number: TPS40210
Hi,
I am designing a new device, which requires an adjustable buck-boost converter. The input voltage is 24V, connected to the buck boost converter is a motor which may draw a current of 1.1A and works on an applied voltage of 0-32V. Now about 1000 pieces will be produced, so the solution should be rather cost efficient. For now I have found the gate driver LM3478 and the bit more expensive LM5022(Q1) and the TPS40210 to built up the SEPIC converter. Now my question: Are these suitable options, or are there better solutions possible? I think the reason that LM3478 chip was not accepted by webench is that the peak gate driver current only allows 1A, but this is different that the system loading of 1.1A. Don't you think? I have another question. Next to a buck boost converter, a boost converter is needed for the rest of the system to assure a constant loading powered by a battery. Now this boost-converter must be bypassed if the input is >23V but if the battery Vin is lower it should be boosted to 24V again. The system connected to the boost will maximally use 1.5A. Is there something available for this problem? Or should I choose a TPS55340 or LM5155 or something which is better to build the boost with a seperate bypass system using a comparator IC?
Thank you
Part Number: TPS54360
After the AC220V is transformed and rectified, the output DC26V-36V is connected to the input of TPS54360. TPS54360 output adjustable voltage 12V-24V, maximum input current 1A, connected to inductive load. Our KMM customer (Guilin Woodpecke) carries out functional testing before aging testing in the production process. There is a 5% damage rate in the aging testing process. The damaged circuit was replaced with a new TPS54360 and returned to normal operation. We tested the damaged IC's PIN2 (VIN) and PIN5 (FB) short circuit to GND. The circuit diagram is attached. Could you help us to analyze the cause of the damage? I
n addition, how to improve the circuit? Do you need to add some protective devices?