Quantcast
Channel: Power management forum - Recent Threads
Viewing all 35901 articles
Browse latest View live
↧

TPS22810: Power Load Switch request

March 11, 2019, 2:10 am
$
0
0

Part Number:TPS22810

Dear TI,

The desired specification is as follows.
- Input voltage: About 9V
- Allowable current: 3A
- OTG function available
- ON / OFF function (High enable)
 => TPS22810DRVR : It's satisfied with all specifications except OTG.
Is there any product that can support OTG?

↧
Search

BQ76PL455A-Q1: Looking for some help to get started on debugging and configuration.

March 11, 2019, 2:10 am
$
0
0

Part Number:BQ76PL455A-Q1

Hello everyone,

My name is Miguel and I am developing a custom made PCB based on the BQ76PL455A-Q1 IC for the management of some custom LiPo cells (for a student project).

This PCB design is mostly based on the suggestions and examples given in the corresponding datasheet. I just finished with the electronic revision of the first prototype I've developed (already finished populating the PCB). Therefore, I have proceeded to connect just the Master Board via UART, providing the required VIO 3.3V supply and tried sending some example command for auto-address learning. I have also connected the 8 cells I will be monitoring per IC, and left them plugged for 10 minutes.

I have two main questions:

- I can't really find in your documentation any procedure as to how to start with the debugging of the electronics (the GUI is only valid for the EVM I guess) so I am not really sure how to proceed for testing of the PCB. Any recommendation or suggestion is welcome.

-There seems to be a bit of overheating right away from the balancing resistors. I have used the suggested FET and a 51 ohm resistor with 0.5W expecting around 100mA current. I am wondering if there's any report of this event and if there's any recommendations for improvements.

Thank you very much and feel free to ask any questions or message me privately.

Best regards and have a nice day,

Miguel Angel Quero

↧
↧

BQ24297: behavior of STAT-pin while Battery is removed

March 11, 2019, 2:13 am
$
0
0

Part Number:BQ24297

Hi Experts,

My customer reported that STAT-pin of BQ24297 is a blinking about 12Hz if battery is removed. (/CE is "L".) Is it expected behavior? The datasheet does not mentioned this behavior.

Best Regards,
Fujiwara

↧

BQ28Z610: How to read the battery capacity in the lithium battery -18650 (2S2P) using the BQ28Z610 part?

March 11, 2019, 2:30 am
$
0
0

Part Number:BQ28Z610

Hi,

The customer's battery type uses a lithium battery -18650 (2S2P).

When using the BQ24773 as a charger and with the BQ28Z610 for the protection/Balancer circuit, here are a few BQ28Z610 display battery questions:

1. How to set and display(read) the battery capacity?

2. Is there a document with reference?

Thanks,

Vic

↧

BQ40Z50-R2: can I use BQ40Z50EVM-561 to evaluate BQ40z50-R2

March 11, 2019, 2:31 am
↧
↧

TPS65131: Pin 1 indicator position to device top marking

March 11, 2019, 2:40 am
$
0
0

Part Number:TPS65131

Hi Team,

Would you please share TPS65131 pin 1 indicator position to device top marking? It seems the diagram is not available inside datasheet. Thank you.

Best regards,

Andy Chu

↧

TPS53667: Required Resistor tolerance for Pinstrap setting

March 11, 2019, 2:45 am
$
0
0

Part Number:TPS53667

TPS53667 has some resistor value table for device setting by pinstrap. Fsw, Slew-rate, per phase current limit and Boot voltage etc...

What level resistor tolerance is required for these setting? 5% is OK? or 1% is required?

On EVM, RF resistor value is 30.1k ohm 1% resistor. Resistor table value is 30k ohm for 500kHz setting. So I think 5% resistor is allowable.

Best Regards,
Kohei Sasaki

↧

UCC28063: 1000W design

March 11, 2019, 2:49 am
$
0
0

Part Number:UCC28063

UCC28063 datasheet states that it is suitable for up to 800W. What causes the limit, given that it is a controller?

Is there any other device to achieve 1000W?

↧
Search

LM5166EVM-C33A: LM5166 - No load current

March 11, 2019, 2:57 am
$
0
0

Part Number:LM5166EVM-C33A

690/5000
Hello,
I am thinking of using your DC-DC LM5166 IC, and to make a first evaluation of it I decided to carry out some tests with your test tool LM5166EVM-C33A.
My final application will be a wireless transmitter and for this reason a low current sleep is very important.

My question is as follows. no-load consumption is too unstable and not specified in the documentation.

The changes introduced in the LM5166EVM-C33A were:
R 5 = O R
R7 = 24.9K
R9 = 1M
R10 = 560K

The accompanying chart is the result of the current measured by the FLUKE 2638A multimeter. Can someone tell me what could be wrong?

Thanks in advance for any help.
best regards
Rui Silva
↧
↧

BQ40Z50EVM-561: The difference between reported pack pin voltage and measured pack pin voltage

March 11, 2019, 3:01 am
$
0
0

Part Number:BQ40Z50EVM-561

hi Team,

it's observed from the bq40z50 EVM.

it's calibrated with CFET and DFET ON, the SBS display and the multi meter measurements are the same value for pack pin voltage

however, once we turn off the CFET by CFET toggle command

the SBS report voltage is ~40mV less than the measured voltage. 

1. what might be causing the difference from the reported voltage and measured voltage? measured voltage to be ~40mV higher

2. if a loader is connected to the P+ (with no load) the reported voltage will become the same with measured voltage again (within 1~2mV)

3. measuring on either side of the R12 on the EVM board, voltage on the side of R12 to Pack Pin is lower than R12 to connector side around 40mV, but why this difference doesn't show when CFET is ON

is there an explanation for the observation?

Thanks for the help

↧

LM5180: calculator rapid output waveform

March 11, 2019, 3:03 am
$
0
0

Part Number:LM5180

Hi Team,

My customer has a confusion on the LM5180 calculator output waveform, and it seems there be a rapid change on the waveform. Please refer to below picture . Could you give any idea why there will be a rapid change here?

↧

TPS563200: Bulk capacitor calculation

March 11, 2019, 3:05 am
$
0
0

Part Number:TPS563200

Hello Community,

I read the article

I can’t find the following parameters to calculate the bulk capacitor for TPS563200 in its specification.
Istep -?
Dmax -? (In my case, VIN (12V) - VOUT (5V), it is written in the specification that the maximum value of the duty cycle is 65% - What value should be used for calculations?)
VIN_Tran -?
TR_PS -?

At the moment, my formula is as follows:
CB> = ((0.5 * 1.5 * 0.65 * 0.00003) / 0.36) - ((20 * 0.000001) * (1 - 0.1)) = 0.000022625 (22uF + 20% = 26.4 uF minimum bulk capacitance)

It contains the following values ​​Istep = 1.5A, Dmax = 65%, VIN_Tran = 0.36V, TR_PS = 30us, CCE_Total = 20uF (Tolerance 10%).

My parameters:
VIN - 12V
VOUT - 5V
Iout - 3A

Does this correspond to the real values ​​of the converter, please comment on the values ​​I have chosen, if they are incorrect, please correct me.

↧

TPS27S100: Recommended Resistor for reverse polarity protection

March 11, 2019, 3:32 am
$
0
0

Part Number:TPS27S100

Hi,

When using TPS27S100 RCP circuit as shown in datasheet figure 31, does the resistor need to withstand the full reverse polarity voltage (eg for a 1k Ohm resitor and 30V reverse voltage protection, I calculate the resistor needs to withstand a Pd of ~900mW)? Is that correct? The EVM uses a 0805 resistor with only 125mW and wondering if that will be sufficient?

Thanks & BR,
KF

↧
↧

TPS61197: TPS61197

March 11, 2019, 3:52 am
$
0
0

Part Number:TPS61197

I'm trying to calculate the OVP resistor values using the data sheet revised June 2017. The given formula is R3 (top resistor) = ((Vout_ovp - 1) / 3.04) x R4 (bottom resistor). The problem is that I can't make the values used in the example schematics match this formula, or in the evaluation board schematic, for that matter. For example, the example resistor values of 1M and 20K respectively give an OVP value of 149V! Does anyone know of a revision to this formula or why the values don't correspond?

↧

ADVANCED-BQMTESTER: List of compatible devices

March 11, 2019, 4:04 am
↧
Search

TPS54560: TPS54560 Latching when Varying Vin

March 11, 2019, 4:28 am
$
0
0

Part Number:TPS54560

Hey All,

So I've designed a circuit that uses the TPS54560 to switch a Variable Vin voltage source to and Ideal Vou of 24 volts. When the Vin is decreased to the point where Vout of 24V can no longer be achieved, Vout will also decrease linearly with the decrease of Vin. However when increasing the Vin back to a point such that Vout of 24V is possible (lets say Vin = 40V), the Vout appears to "latch" on the way back up and wont surpass approx 17V.

I've also tested this with the TPS54560-EVM board and get the same effect.

Any help would be greatly appreciated.

Cheers

Ricky

↧

TPS65310A-Q1: TEST MODE

March 11, 2019, 4:51 am
↧
↧

TPS61202: TPS61202 about Quiescent current, Shutdown current, Input leakage current.

March 11, 2019, 4:52 am
$
0
0

Part Number:TPS61202

Dear Sir,

I have some question about Iq, Isd, ILKG.

1. Which mean there are Vin, Vout, Vaux in Iq.
2. Which mean there are Vin, Vaux in Isd.
3. what is input leakage current.

Thanks.

↧

TPS25221: specification differences in TPS2553 and TPS25221

March 11, 2019, 5:02 am
$
0
0

Part Number:TPS25221

Hello,

would it be possible to let us know the specification differences between TPS25221 and TPS2553. when I compared with the datasheet, there is no functional differences, but on-resistance and current limit, current limit response time are different.

best regards,

↧

TPS24700: Schematic Review

March 11, 2019, 5:03 am
$
0
0

Part Number:TPS24700

Dear Team,

Can you help on the schematic review?

I already checked it, but I may need your double confirm.

Attached the MOS and excel tool

(Please visit the site to view this file)

(Please visit the site to view this file)

BR

Kevin

↧
Viewing all 35901 articles
Browse latest View live
Search
<script src="https://jsc.adskeeper.com/r/s/rssing.com.1596347.js" async> </script>