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TPS92515: Inquiry about an efficiency

May 23, 2019, 7:17 pm
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Part Number:TPS92515

Hello team,
I would like to ask you the following questions.

Q1
Please let me know about this equation ?
This is the equation 12 in page 18 of data-sheet.

Is 60E-9 a MOS-FET switching time?
Is 1.2 an efficiency of switching conversion?

Q2
Would you tell me how should I estimate an efficiecy of n?
Should I allways estimate an efficiency of n as 0.9?
Otherwise should I calculate n from resistors ,condensers and inductoers around this device?
I want to use 24V for Vin, but the graphs in datasheet about efficiency show 30V or 42V as minimum of Vin.

Q3
Could you provide me with an efficiency in this case?
Vin=24V
Vout=20V
Iout=0.25A
fsw=250kHz

Regards,

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UCC23513: UCC23513

May 23, 2019, 7:19 pm
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Part Number:UCC23513

Hi,

In UCC23513 datasheet, a suggestion interlock circuit is proposed. But I am curious about the CMR problem especially when LED is off. Always we shunt a transistor with LED when LED is off which is good for CMR. But for the Interlock circuit, there is no shunt path for LED off. Will I face the CMR problem with interlock circuit?

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TLV62565: negative voltage maximum rating

May 23, 2019, 7:42 pm
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Part Number:TLV62565

Hello

              Below is customer testing waveform of SW to GND. But negative voltage is -2.08V and looks over specification. Could I know this negative voltage meet SW specification and will not damage device? Thank you. 

BR

Patrick

             

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TPS22953: Can we use the power switch only for negative input voltage ?

May 23, 2019, 7:48 pm
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Part Number:TPS22953

I need a power switch with enable pin to provide the load with -0.6V to -1.0V. Current is less than 1A.

Can we use the TPS22953 for the negative input voltage? If it will work, how do we hook up the power?

Is there an example schematic for negative input voltage.

If the device TPS22953 will not work, please recommend another device that will work.

Thanks.

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TPS54610: where can I download the Swift Designer Software

May 23, 2019, 7:55 pm
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LM5041: LM5041 SCP(short circuit protection) function

May 23, 2019, 8:02 pm
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Part Number:LM5041

Hi,

Customer is looking at LM5041 for its short circuit protection, when output is short, how can this IC prevent PWM and realize SCP?

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TPS54218: Output rising not smooth with glitch

May 23, 2019, 8:44 pm
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Part Number:TPS54218

Hi~

We found the output voltage raise is not smooth and with glitch when the output voltage is set to 1.8V.

I checked with the waveform in the datasheet and it seems there is same behavior.

May I know why the raising is not smooth and how to improve it?

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UCC28722: UCC28722

May 23, 2019, 9:51 pm
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Part Number:UCC28722

Hi there,

I am using UCC28722 for energy meter application with three phase input by using guidelines of SLAU721A.

The components values as per SLAU721A are all same with difference that input instead of single phase its 3 phase bridge rectifier

My issue is that Ic's are getting damaged at normal power Up, I have checked the resistances at various PINs then it shows base drive pin ie PIN 3 of UCC28722 is shorted to ground or

sometimes VDD.

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Questions for delays

May 23, 2019, 10:02 pm
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Hi Team,

Customer doesn't understand these parameters very well. Can these delays be set to 0; will it have any effect?

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TPS3808-Q1: About threshold voltage(VIT) and hysteresis.

May 23, 2019, 10:20 pm
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Part Number:TPS3808-Q1

Hi team.

The TPS3808-Q1 datasheet specifies the VIH and VIL values of VIT.

I thought about VIH and VIL of VIT as follows.

  • VIL : The voltage at which Sense is recognized as Low.
  • VIH : The voltage at which Sense is recognized as High.

However, in Figure 1 below, the voltage at which Sense is recognized as High is indicated as VIT + VHYS.

1. Please describe VIH and VIL of VIT in detail. (Explain how it relates to Reset operation)

2. Please explain VIH and VIL relationship with hysteresis.

Thank you.

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TPS61195: SMBus frequency

May 23, 2019, 10:28 pm
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Part Number:TPS61195

Hi, Team,

Can TPS61195 support 400kHz SMBus frequency? Could you please let me know the max frequency?

Best Regards,
Satoshi Yone

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BQ40Z50-R2: Have some doubts in designing the BMS and with the Bq IC

May 23, 2019, 10:49 pm
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Part Number:BQ40Z50-R2

Hello,

I am designing the BMS using bq40z50-r2 and Bq494700.

My first question is,

1.Will these two IC's completes BMS requirements?

2. Whether the internal cell balancing is enough?

3.Whether smbus supports I2C?

4.Are the charge and discharge FET's are PWM controlled?

5. Is ther any voltage regulation is happening depends on the number of cells connected?? lets say, If  the input voltage is 12V for 4 cells.

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TPS61291: TPS61291 3V3 with 3.6 Li-Battery

May 23, 2019, 10:53 pm
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Part Number:TPS61291

Hello,

I would like to use the TPS61291 with a LiMnO2 Battery (3V full, 2V near empty). The Device will deliver 3.3V for the Main Application. The battery type we would use, is also available as LiSoCl2, which has a starting voltage of 3.6V, similar to Li-Ion Battery packs.  Since it is possible (but not recommoend) to insert such a battery, it would be bad if the device gets destroyed. All devices that are on the 3.3V output have a maximum rating of >4V, so they would not be a problem.

Is it a critical problem if the TPS61291 would be powered with 3.6V when Vout is 3.3V, or would it just "condcut" and forward the voltage?. I am aware, that its possible to switch to bypass, but this is only available when the MCU has already started, to determine that the voltage is 3.6V and switch to bypass. A few milliseconds the Regulator would be on boost configuration?

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LP87332D: Question about LP87332D pin CLKN/GPO2

May 23, 2019, 11:04 pm
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BQ25606: BQ25606 TS pin setup?

May 23, 2019, 11:15 pm
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Part Number:BQ25606

I designed the circuit as above.
Circuit status.
V_CHG : DC 12V(Power Supply)
VBAT : 1Cell Li-ion(3.7V, 14,000mAh)
TS Pin : Only Res DIV.(No Ext' Connect)
D+, D- : NC
VBUS, VAC : 12V
BAT : 4.0V
SYS : 4.0V
REGN : 6.2V
STAT : High
/PG : High
But...
Power Supply Current is 0mA.
It is not charging.
Is the resistor setting of the TS pin wrong? Or D+,D-?
Plz respond.
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TPS23880: TPS23880 cannot work

May 23, 2019, 11:16 pm
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Part Number:TPS23880

Hi Sir

We are having problems with the POE circuit. After soldering the circuit, the TPS23772 can work correctly and correctly handshake the output voltage. However, the TPS23880 does not have a handshake signal output. The GAT1 and GAT2 pins are always low, and there is no signal, as if the IC is not powered. However, measuring 3.3V and 52V power supply are normal, please help confirm what is the reason. the TPS23880 Circuit diagram such as attachment

(Please visit the site to view this file)

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LMR14010A: 28-40V input ,24V 1A output solution

May 23, 2019, 11:33 pm
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Part Number:LMR14010A

Hi,

My customer asked for a 28-40v input and 24V1A output solution, we first recommend LMR14010A, but customer think the RθJA is a bit high(102℃/W), based on their experience, this device is just suitable for 6-8w application.  please kindly suggest a solution which can meet this scenarios。 thanks.

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BQ79606EVM-897: Cannot find bq79606 bqz in bqStudio

May 23, 2019, 11:57 pm
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Part Number:BQ79606EVM-897

Hi Team,

I installed bqStudio 1.3.90 to evaluate bq79606EVM. However, I cannot find suitable bqz in dialog of bqStudio. Could you kindly attach this bqz here?

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BQ30Z554-R1: how to measure the delay time of OVP and UVP

May 24, 2019, 12:03 am
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Part Number:BQ30Z554-R1

Dear sir,  i need to measure the Accurate delay time of OVP and UVP in my board , i used the Battery simulator and oscilloscope to trigger the Voltage of Bm  and csg/dsg ,but the result Out of specification much，  please give some suggestion about the equipment and method, thanks.

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TPS22933: Pins interchangeable?

May 24, 2019, 12:13 am
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Part Number:TPS22933

Dear TI-Team,

I think it's clear but I just want to confirm: the input pins of TPS22933 are interchangeable, right? BAT, USB and DC_IN seem to have the same characteristic so it should be no problem to connect a 5V supply to DC_IN and  a 9V supply to USB, right? Leakage current is no different, either?

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