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UCC28720: The power supply output voltage is good with no load, but drops the voltage when loaded

April 25, 2019, 4:36 am
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Part Number:UCC28720

Hello,

I copied the reference design inside UCC28720 datasheet, including same part numbers for discrete. The design gives the expected output with no load connected, and when a 10 ohm load is added the voltage drops to zero with some repeatitive peaks. I don't know where is the potential problem since it is completely following the reference design

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LM25011: Soft Start function

April 25, 2019, 4:37 am
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Part Number:LM25011

LM25011 is damaged when Css value increase(0.122uF) at input voltage ON/OFF test.

Do you have any cause that LM25011 is damaged by increasing Css value?

Vin=34V, Vout=26V, Fsw=500kHz, no load condition.

And I would like to know Css discharge function. On datasheet block diagram, I think SS pin has FET for discharge.
When does this FET turn ON? Is there possibility that Css is not full discharged because capacitance value is large, and Vin is added in this condition, then LM25011 is damaged?

Best Regards,
Kohei Sasaki

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BQ25710: Lead Acid Battery

April 25, 2019, 4:40 am
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Part Number:BQ25710

Hi All,

Is it possible to use the BQ25710 to recharge a 12V, 8A, Lead Acid Battery?

Looking at the datasheet it seems the maximum cell number is limited to 4, while the battery I need to use has 6 cells with 2.1V/cell, which is half of the default value in REG0x15().

Which configuration, if any, shall be used for a such type of battery?

Thanks

Regards

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LP5569: LP5569 CLK concern

April 25, 2019, 5:27 am
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Part Number:LP5569

Dear Team,

If I want to use LP5569 provide CLK to LP5562 is connect like below?

Connect together and use resistor to provide the power.

Or connect the clk of LP5562 and LP5569 is enough?

BR

Kevin

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BQ34Z100-G1: About loop count problem

April 25, 2019, 5:27 am
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Part Number:BQ34Z100-G1

Dear TI technical experts: After self-learning, I changed the status to 02 and then performed charging and discharging to test whether my equipment met expectations, but what surprised me was:
1. Why does my full charge capacity display drop from 16.5A to 15.2A?
2. The cycle count is increasing during the discharge. During one complete charge and discharge process, my cycle count increases from 0 to 15, which is obviously problematic.

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LM5118: LM5118 by Pass Voltage

April 25, 2019, 5:31 am
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Part Number:LM5118

Dear Team,

My custoemr's design Vin=40~57V.

Vo=54V.

Is it possible to have design as below:

If Vin<54, Vo boost to 54V.

If Vin>54V, Vin =Vo. The LM5118 will by pass the Vin.

BR

Kevin

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TPS2660: NC and SHDN terminal of TPS26600

April 25, 2019, 6:04 am
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Part Number:TPS2660

Hi

I got two questions from my customer about TPS26600.
Could you tell me the following questions?

1.
I think that NC terminal should be open, but its is connected to RTN terminal in EVM schematic.
Which is correct?

2.
If I want to be enabled TPS26600(not to use SHDN terminal) at all times, should I open it's teminal?

Best regards,
Yokota
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LM5175：Chip heating is serious, when the input voltage is greater than 9 V, Vcc output is still only 4 V.

April 25, 2019, 6:11 am
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Part Number:LM5175

Set input 15V, output 5V, 1A. The chip is always damaged, the heat is serious, the VCC output is only 4V, the amplitude of the four-way drive pulse becomes only 4V, and the duty cycle does not conform to the theoretical value. Moreover, the switch noise is high when the chip is not damaged

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LM4050-N: Vout accuracy at low temp

April 25, 2019, 6:20 am
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Part Number:LM4050-N

Hi

Our customer found a sample which has low accuracy at low temp. (Please see the following temp.)

Vs=8V, Vout=5V, LM4050AIM3-5.0

1. Do you think that accuracy of a failure sample is not normal at low temp?

2.Is there any wrong value for the external resistor and capacitor?

(I think the Rs is a little bit smaller than start value but it is not big problem for this case.)

Best Regards,

Koji Hamamoto

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TLV1117: SPX3819M3-3.3 P2P device recommendation

April 25, 2019, 6:46 am
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Part Number:TLV1117

Hi guys.

Does TI have the P2P device too SPX3819M3? This device input spec can cover 16V. it is a little bit lower. So do we have similar or P2P function device to replace it?  Our system input voltage is around 12V. output is 3.3V. current require the device cover 1A.

Your feedback are very appreciated.

Thanks

-Pengfei

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TPS51200: VREFOUT overshoot and VTT step

April 25, 2019, 6:54 am
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Part Number:TPS51200

hi, anyone who concerns,

The TPS1200 circuit works in Enable mode.

I figured out the VREFOUT waveform starting up with an overshoot . 

And VTT with a step follow VDDQ as figure shows below.

I find some similar questions in forum but no exact conclusion.

Would you please give me some advise on eliminating the overshoot and step? Thx：D

YELLOW-VDDQ/GREEN-VTT_EN/BLUE-VTT/PINK-VREFOUT

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BQ24259: abnormal current consumption

April 25, 2019, 6:58 am
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Part Number:BQ24259

Hi,

my customer is using BQ24259 in their product. All load are connected to SYS.

VSYS will be boosted to 5V to the OTG port through PMU to power external products like keyboard.

When the customer powers the system with battery and no adaptor, the current from the battery will be around 800mA.

But when they connect the OTG 5V to VBUS of BQ24259, the current from the battery will upgrade to about 1.3A.

It's a strange phenomenon and how can we explain it?

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LMZ31710X2EVM: Layout for the demo board

April 25, 2019, 7:08 am
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Part Number:LMZ31710X2EVM

Hello all,

my customer asks for a layout of these demo board. Do we have one?

Best regards

Egon

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LM20242: High switching noise at output voltage

April 25, 2019, 7:10 am
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Part Number:LM20242

Hello, 

I have designed DC to DC converter with IC LM20242 using WEBENCH Design tool. Input is of 24VDC and output is 10VDC, 0.5A at switching frequency 545kHz.

I'm facing problem in output voltage. it has high switching noise at output(nearly 7 volt peak to peak).

below is snap shot of schematic and layout.

please kindly highlight the issue that is causing this problem.

Your early replay most appreciated. 

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LMR14050: Could you kindly help to check the below schematic, and give some advice about it.

April 25, 2019, 7:21 am
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Part Number:LMR14050

Dears:

Could you kindly help to check the below schematic, and give some advice about it.

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TPS7A47: Could you kindly help to check the below schematic, and give some advice about it.

April 25, 2019, 7:28 am
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Part Number:TPS7A47

Dears:

Could you kindly help to check the below schematic, and give some advice about it.

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ISO5852S: Whats the Zener on the Desat pin for?

April 25, 2019, 7:30 am
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Part Number:ISO5852S

Hi,

I found this schematic in one of your EVM designs foe the ISO5852s. Is this 3V3 Zener (MMSZ4683T1G) used to increase the threshold voltage of Desat triggering?

Is there any math by which I can estimate the amount of current that the IGBT will have to pass through before turnning-off (max current)?

Regards,

Tony

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TPS54540B-Q1: VIH_min、VIL_max range for the EN pin of the TPS54540BQDDARQ1 is required

April 25, 2019, 7:45 am
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Part Number:TPS54540B-Q1

VIH_min、VIL_max range for the EN pin of the TPS54540BQDDARQ1 is required

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TLV62565: What about CSD16323Q3?

April 25, 2019, 7:51 am
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CCS/BQ27441-G1: Can you provide the reference procedure?I use the MCU of ST

April 25, 2019, 8:26 am
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Part Number:BQ27441-G1

Tool/software: Code Composer Studio

Can you provide the reference procedure?I use ST MCU. If the accuracy requirement is not high, can we not calibrate the cell curve?You just learn in cycles

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