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UCC28951-Q1: UCC28950, PSFB, NO OUTPUT SIGNAL

March 27, 2019, 8:45 pm
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Part Number:UCC28951-Q1

I HAVE A SERIOUS PROBLEM IN WHICH I AM SURE IT WILL BE A SIMPLE FIX, WITH YOUR KNOWLEDGE AND EXPERTISE THAT IS.

Problem: Simple, no output signal (OUTA thru OUTF)

Attached you will find the excel spreadsheet for the UCC28950-Q1. All components are a .1% tolerance and are the exact values of the excel spreadsheet. Running PCM, current sense and voltage feedback from the output voltage.

I am not using OUTE and OUTF therefore I have Schottky diodes in their place.

Question 1 -- Should Pin #4 have voltage on it. Pin #2 (non-inverting input) has 2.5 volts and Pin #5 (non-inverting input) has 5.4 Volts. From what I have read, Pin #4 is equal to the lower of the two, therefore I should see around 2.5 volts on Pin #4. I measured 200 mV on Pin #4.

Question 2 -- Should I have voltage on Pin #6, #7 and #8. I show 200 mV which is what I have on the ground Pin #24.

Question 3 -- Pin #9 also shows 400 mV, should that be around 1.5 volt, just guessing.

Question 4 -- Why does Pin #10 have 5.0 Volts. To me this is just wrong.

Question 5 -- Pin #11 also shows 200 mV, same question.

Question 6 -- Pin #12 show 169 mV, should this be about 450mV.

If you can answer these questions and get me output on Pin #19 thru Pin #22, that would be great.

Please review the attached and send me any info bad or good.

 

SEE ATTACHED MAGNETICS 00K4022E060 PDF

        

    

(Please visit the site to view this file)

(Please visit the site to view this file)

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UCC28780: Pls suugest UCC28780 for input 3 phase(340-550Vac ) output 24V/10A Flyback solution

March 27, 2019, 9:11 pm
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Part Number:UCC28780

Dear ALL

Pls help to suggest  to used UCC28780 for power supply flyback topology  . input voltage input 3 phase(340-550Vac )   output 24V/10A  

Thank you so much & Bestregard

Prarinya

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BQ51222: WPG_N/PD_DET_N questions

March 27, 2019, 9:14 pm
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Part Number:BQ51222

 Hello

                   Customer has some question about WPG_N/PD_DET_N signal status of BQ51222? Could you help provide your comments for below? Thank you.


As talked, Please help to confirm the questions below for CFBD18 WLC BQ51222.
1. WPG_N signal status when wireless charge state. we have measured the signal only two low pluse and then keeps high.is it correct?
2. expWPG_N and PD_DET_N signal action status.
3. When the USB is Charged, the PD_DET_N signal from low to High the delay time is 12 seconds. is that correct? can we adjust the timing?

BR

Patrick

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TPS26624-25EVM: Regarding absolute maximum operating temperature

March 27, 2019, 9:16 pm
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Part Number:TPS26624-25EVM

Absolute maximum value of junction temperature is the same as the thermal shutdown temperature value T_TSD. Will this cause permanent damage to device or deteriorate its performance if the device is operated at thermal trip level for prolonged period of time ?

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BQ28Z610: difference between battery voltage and pack voltage

March 27, 2019, 9:43 pm
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Part Number:BQ28Z610

Dear Ti Experts,

My customer found similiar issue when they test BQ28z610. they finished calibration and the voltage difference is around 5mv, after learing, many pack's voltage difference between "battery voltage" and "pack voltage"  is above 40mv. Customer tested to set and clear REST flag , the result is same. And they found the current was 0 all the time, the pack is no load, just connected with EV2300
Could you kindly help to advise the reasons which may cause this phenomenon? And does this phenomenon will cause any risk to gauge functioning well ? Thanks a lot.

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TPS2065C-2: Need you help with TPS2065CDBVR connection

March 27, 2019, 9:46 pm
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Part Number:TPS2065C-2

Hi Team,

Could you please check the connection of TPS2065CDBVR.

It is ok to connect FLT pin to EN pin (IO from MCU) with 100 Ohm resistor?

The resistor between pin 5 and 1 is option when TPS2065CDBVR is not assembly.

Thanks, 

Shlomi

(Please visit the site to view this file)

 

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TPS53513: Epoxy voids criteria

March 27, 2019, 9:59 pm
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Part Number:TPS53513

Hi,

May I know the epoxy voids criteria for the device TPS53513 (VQFN-CLIP).

Hope i could get some information about this, thank you!

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TPS1H100-Q1: TPS1H100-Q1 TPS2HB08-Q1 24V bus system

March 27, 2019, 10:30 pm
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Part Number:TPS1H100-Q1

Dear  TI:

TI High Switch products can be used in 24V system , such as bus or truck .
or does ver "T" products released or not. 
thanks.

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LM5009: discontinuous operating frequency

March 27, 2019, 10:32 pm
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Part Number:LM5009

Hi

According to datasheet, the frequency in discontinuous operating mode is described at bellow.

The variation of frequency is similar to the variation of Ton as you mentioned at the previous post.

How about in discontinuous operating ? ( How much is the variation in DCM? Is that same as CCM?)

Best Regards,

Koji Hamamoto

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Whether will the pulse width of DPWM actually change when the filter output to DPWM or DPWM registers value change 250 - 750ps?

March 27, 2019, 10:36 pm
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Part Number:UCD3138A

Hello

I have done a test on my board. I configured the DPWM to work at normal mode and CLA_EN = 0,

        Dpwm0Regs.DPWMEV1.all = 608;  
        Dpwm0Regs.DPWMEV2.all = 608 + pwr_para_config.max_duty;    
        Dpwm0Regs.DPWMEV3.all = 608 + pwr_para_config.max_duty + pwr_para_config.deadtime2
        Dpwm0Regs.DPWMEV4.all = 608 - pwr_para_config.dead_time1;

pwr_para_config.max_duty would increase certain value and then after 10ms decrase same value and wait 10ms, repeatedly. So the pulse width of DPWM0A would change certain value periodically. 

When pwr_para_config.max_duty changed 1 periodically, and the pulse width of DPWM0A would change 250ps periodically. But there was no change on output voltage. I had tried to set the change value to 1 to 4. Until I set the change value to 4, which means the pulse width of DPWM0A would change 1ns periodically, there was dynamic change on output voltage.

First waveform is the output voltage ripple when the pulse width of DPWM0A change 0.75ns periodically. We can see that there is no obvious change.

Second waveform is the output voltage ripple when the pulse width of DPWM0A change 1ns periodically. We can see that there is dynamic change.

So I would like to know that whether will the pulse width of DPWM actually change when the filter output to DPWM or DPWM registers value change 250 - 750ps?

Channel 1(Yellow) output voltage ripple  Channel 2(Green) DPWM0A

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LM1086-MIL: max input voltage specification

March 27, 2019, 10:43 pm
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Part Number:LM1086-MIL

Dear E2E team,

I would like to use LM1086IT-5.0/NOPB LDO in one of my development.i have some queries regarding this part as below.

1.I could not find operating max input voltage specification for this LDO. Can you please let me know max operating input voltage specification?.

2.My specifications are input voltage is 24V and required output voltage/current  :5.0V/0.4A whether this LDO is suitable for this specifications?.

3.Rth for TO-220 package?

Regards

Thirupathi 

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BQ24773: learn mode function

March 27, 2019, 11:04 pm
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Part Number:BQ24773

Dear Sir,


We are intending to use the BQ24773 in a portable electronic equipment for Battery Management.

Brief details of the Project is mentioned below:

1)Input to BQ24773: 18V to 22V
2)Type of Battery:3 Li-Ion battery pack 
3)System Voltage: 12V to 14V
4)Max. System current: 2A
5)Max. Battery Charging current: 2A


The queries regarding this IC are:

1. what is the significance/function of learn mode in the IC.

2. when learn mode is enabled, the battery discharges completely but it does not start to charge once it is depleted below threshold. should the adapter be reconnected in order to charge the battery.

looking forward for your response.

with regards,

Yashaswini 

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TPS659039-Q1: Power Good rising before output voltage

March 27, 2019, 11:11 pm
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Part Number:TPS659039-Q1

Hello, when we are validating the TPS65903x-Q1 PMIC  regulator used in one of the product , we observed that the power Good is rising in advance with 2.4ms before the output voltage getting and this behavior is same in other Boards also.

Can you Please clarify the reason why Pgood is advance to the output?

Reference:

Channel 1 - IC power supply- 5V- (yellow)

Channel 2 - Enable signal - 3.3V - (Blue)

Channel 3 - output voltage - (Pink)

Channel 4 - Pgood (Green)

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TPS65311-Q1: ADAS 4 IN 1 power management IC receommendation

March 27, 2019, 11:46 pm
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Part Number:TPS65311-Q1

Hi team, 

For this specific requirement in camera ADAS system, 4 in 1 PMIC devices recommendation, TPS65311-Q1 is 8*8 package. Is there any other smaller size (like 3*3) recommentdation? 

DC-DC 8-12V     TO  3.3V           Max 500mA

       DC-DC              1.8V           Max 250mA   

        DC-DC/LDO     1.1V           Max 250mA

        LDO                 2.9V           Max 200mA

Best Regards,

Gene

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SG3524: PWM Controller question.

March 27, 2019, 11:50 pm
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Part Number:SG3524

Dear TI Team,

I am looking for a product of the specifications below.

I could not find it on the TI site and would like help.

Spec : 

1. bandwidth : 4Mhz up to 10Mhz

2. Pulse width : 200ps under

only need to spec the above two conditions.

Please check if there is a product.

Thanks.

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TPS65185: Is a single TPS651851 able to drive a 13.3 inches screen from E Ink

March 27, 2019, 11:57 pm
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Part Number:TPS65185

Dear Team,

As the title suggests, is a single TPS651851 able to drive a 13.3 inches panel from E Ink?

Thanks. 

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LM5030EVAL: MATHCAD

March 27, 2019, 11:59 pm
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LMZ34002: Could you tell me how to determine resistors for EN?

March 28, 2019, 12:04 am
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Part Number:LMZ34002

 Hello guys,

 One of my customers was concidering using LMZ34002. But the device output capacitor needs 100uF ceramic.

 100uF capacitor is difficult to buy for them recently. So they wanted to reduce the output capacitor value.

 Then I recommended them to use LMZM23601 like application note

http://www.ti.com/lit/an/snva807a/snva807a.pdf

because the device can operate with smaller output capacitor than LMZ34002 base on the folllwing thread.

https://e2e.ti.com/support/power-management/f/196/t/784216

 The customer has a question about EN function in this application note use case.

Q. Could you tell me how to determine resistor values of RENT/RENB connected to EN pin in Figure 33

on page 25 in LMZM23601 datasheet when we use LMZM23601 like the application note?

   

 I think the resistor vallues to start LMZM23601 can be determined by Equation3 in the datasheet

because the device GND is 0V before switching starting.

 But I don't know how to determine the resistor value of RENT/RENB  for LMZM23601 output stopping.

 Could you please tell me how to determine the resistor values?

 Your reply would be much appreciated.

 Best regards,

 Kazuya Nakai.

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TPS54060-EP: TPS54060-EP short circuit protection

March 28, 2019, 12:17 am
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Part Number:TPS54060-EP

I looked at page 20 of the datasheet and designed TPS54060 to be short-circuit protected. But this circuit was not protected at short circuit. Why this circuit is not protected at short circuit?

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LM3402: PWM dimming frequency range

March 28, 2019, 12:27 am
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Part Number:LM3402

Hi,

I need to know the recommend PWM frequency range for brightness control of LM3402. Also will it be sufficient if we apply a 3.3V logic PWM signal? 

Thanks

Sivaraj,

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