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BQ34Z100: Battery line

January 28, 2019, 6:38 pm
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Part Number:BQ34Z100

Dear all.

Our customer is going to insert ferrite beads in the line of the battery.
The resistance level of this FB is 7mΩ, so total is 14mΩ(+/-).
What kind of impact will it have?

Regards,
PAN-M

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TPS92692: Sleep/Recovery time

January 28, 2019, 7:14 pm
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Part Number:TPS92692

1. Will TPS92692 go into “sleep” mode if the PWM input goes low for more than 65ms?

2. For next recovery cycle, when the PWM goes high, will the startup time take more than 1ms?

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TPS2557: Reverse Current with EN pin condition

January 28, 2019, 7:16 pm
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Part Number:TPS2557

Dear Team,

Does IREV, Reverse leakage current, depends on the condition of EN?

If EN is low and device is disable, will IREV appear at the condition of Vout=6.5, Vin =0V?

Regard,

HirokazuTakahashi

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TPS2557: Setting time for Two-Level Current-Limit Circuit

January 28, 2019, 7:23 pm
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Part Number:TPS2557

Dear Team,

We are studying Two-Level Current-Limit Circuit in Figure 22.

Could you let me know the settling time for changing the current limit value at the condition neglecting the slew rate of the external FET Q1?

We want to know the worst delay time for it.

Best Regards,

Hirokazu Takahashi

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LM317: EoL plan for DDPAK

January 28, 2019, 7:31 pm
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Part Number:LM317

Hi team,

Is there any plan to change LM317S/NOPB to EoL?

Regards,

Saito

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TPS1663: RTM date check

January 28, 2019, 7:53 pm
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Part Number:TPS1663

Hi team,

My customer is evaluating our TPS1663x and plan to do a demo product on Feb. They want to know TPS1663x sample schedule and official RTM schedule. Hope you could help on this. Thanks.

Best regards,

Wayne

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bq9003 bqEVSW software

January 28, 2019, 7:55 pm
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Hi, Where can i download  this software?  My software have been encrypted by mistake,  I want to this  thread can  be answered by  

My email is luckfish1985@live.com

thanks

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TPS27082L: output rise time setting

January 28, 2019, 8:02 pm
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Part Number:TPS27082L

Hello,

Our customer using TPS27082L and they want to change the output rise time longer than 1ms (longest time in the datasheet Table.1)

Specifically, they would like to set trise to 5ms with VIN=3.3V, R1=130kohm, C1=0.22uF. 

In their test, the device could work with around 5ms trise by above settings. 

However, is it not recommended to use with beyond the value of Table.1 ? If it is not, please let us know the reason.

Thanks and best regards,

Hiro

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BQ2000: Questions about charging

January 28, 2019, 8:22 pm
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Part Number:BQ2000

Hi,

We got questions from the customer about bq2000. Please refer to the attached file for the detail.

We would appreciate it if you could give us your feedback.

(Please visit the site to view this file)

Best Regards,
tateo

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TPS92515: What is the maximum wire length between EVM and LED lamp?

January 28, 2019, 8:45 pm
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Part Number:TPS92515

 Hello guys,

 One of my customers is evaluating TPS92515 using TPS92515 EVM (TPS92515HVEVM-749) for their new products.

http://www.tij.co.jp/jp/lit/ug/slvuar5/slvuar5.pdf

 In the evaluation, they observed that the output current is unstable (the current change 800mA~1200mA, target is 1000mA) like a oscillation. They use 1meter length wire

(AWG24 or AWG26) between EVM J2 and LED lamp. 

They think this length may be too long  for TPS92515. In other word, this long wire causes the unstable output current.

 Could you give me your answer to the following question.

Q1. What is the maximum wire length between EVM and LED lamp in their test condition?

 Their test condition:

 Vin=24V, Vout=1 LED (Vf=2.0~2.2V), Iout=600mA~1000mA.

Q2. Is there any way to avoid the output current oscillation?

 Your reply would be much appreciated.

 Best regards,

 Kazuya Nakai.

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TPS22918: Discharge timing

January 28, 2019, 9:37 pm
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Part Number:TPS22918

Hello,

My customer have a question below.

If the voltages of ① and ② become 0 V at the same time, will the discharge function function normally?

When Von becomes Low, will the discharge function work regardless of a state of VIN?

Regards,

Taichi Nakamura

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UCD7242: UCD7242 FLT issue in PTD08D210

January 28, 2019, 9:46 pm
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Part Number:UCD7242

Hi, Team,

My customer found some issue with the FLT signal with UCD7242 in PTD08D210 module. Customer designed the SCH with the reference design from the xilinx KC705's SDK. They found one of PTD08D210 will report the FLT fault randomly, mostly happened during the start up.

I let customer increase the start up time, it will have some benefit but still have the FLT issue.

Following are the waveform for the FLT issue.

SCH as followed:

We found there are some application for ucd74120, which reminded the similar issue as this. Should be the same issue for the UCD7242? Thanks!

(Please visit the site to view this file)

(Please visit the site to view this file)

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Method of earth resistance

January 28, 2019, 9:50 pm
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What is the best way to measure earth fault resistance?

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TPS92515: Are NC pins (No.8/9/10/14) not connected to anywhere internally?

January 28, 2019, 9:50 pm
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Part Number:TPS92515

 Hello guys,

 One of my customers is eveluating UCC27714 on their own board. They want to know whether NC pins (No.8/9/10/11) are not connected to anywhere internally or not

though the device datasheet says that those pins are "No connection". Does "No connection" mean that no internal connection?

 Your answer would be much appreciated.

 Thank you and best regards,

 Kazuya  Nakai.

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UCC3817: Hold up time

January 28, 2019, 10:34 pm
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Part Number:UCC3817

hello,

How to know the 1)  Hold-up time  (Output Capacitor design) for design of 1.5kW , 425V Vout. ? 

and in below mentioned formula Vout is 385 But how to know Vout(min) ?

www.ti.com/.../ucc3817.pdf

thank you

regards,

Bharat

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TPS92641: TPS92641 power supply question

January 28, 2019, 10:37 pm
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Part Number:TPS92641

Hi team,

please help with my customer's question as below.

For the TPS92641, because there is a 12V bias power supply on the customer board. So the customer ask, could they supply the VIN with the 12V and don't connect the HV power input with the VIN pin?

is there any risk with this solution?

Regards

Robin Liu

robin-liu@ti.com

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TPS65094: TPS65094 OFFONSRC: UVLO issue

January 28, 2019, 10:42 pm
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Part Number:TPS65094

Dear,


our client use TPS650942 for Intel Apollo Lake (SR33Q (Intel Atom x5 E3930), , but we find the GUI Tool show UVLO Register show "1"


and we check hardware VSYS waveform was keep 15V, also system was Normal(no shut down and thermal normal),

why UVLO Regisrt was show "1"

dump file:

(Please visit the site to view this file)

measurement SYS:

schematic:

(Please visit the site to view this file)

Intel PMC Firmware:

Prod : 03.1b.00_PROD

Prod : 03.1f.00_PROD

If any suggestion, Please advise me.

Thanks,

Best regards,

Lawrence.

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UCC3817: design of 1.5kw Boost pfc

January 28, 2019, 10:44 pm
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TPS61165: can it support input 3.3V, output 6.4V/60mA?

January 28, 2019, 11:51 pm
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TPS549B22: EN_UVLO logic level

January 28, 2019, 11:53 pm
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Part Number:TPS549B22

I am using multiple TPS549B22 in my design. I want to control the EN_UVLO through a controller. Below are the operating conditions of TPS549B22.

Vin = 12VDC

Vout1 = 2.3V;

Vout2 = 1.55V;

Vout3 = 3.7V;

My controller output is 3.3V CMOS. This is connected to EN_UVLO of TPS549B22. Will this work or do I need higher voltage levels? 

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