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

LM25088: Negative Voltage Output Current Limit

January 2, 2019, 7:00 am
$
0
0

Part Number:LM25088

Hey all,

So I used the TI Webench design tool for the LM25088-1 for an input voltage of 12V to -7V output with 2A current.  I created the following schematic:

Here is the board layout:

On power up, the voltage is correct at -7V and works up to loads of -300mA but at any higher load, it immediately current limits (my assumption) and the output goes to -1V. This is a part of a larger power supply test PCB so the voltages and currents can be tested. Did I do something incorrectly? Is the layout an issue in this case? 

Let me know and thank you for your time!

Scott

↧
Search

REF5050: output voltage is 4V when temp is -40C

January 2, 2019, 7:03 am
$
0
0

Part Number:REF5050

Hello,

My customer reported that the output voltage of REF5050 is 4V under -40C temp, could you please suggest the possible reasons?

I checked the input voltage is 6.6V and the load current is 0.35mA under -40C, it's not low dropout problem. Here are the application circuit.

Thanks.

Dongbao

↧
↧

BQ25703A: Recommend Power MOSFETs of BQ25703A

January 2, 2019, 7:30 am
$
0
0

Part Number:BQ25703A

Hello

Please help recommend power mosfet of BQ25703A to me, thanks ,EVM refference design MOSFETs are have too much margin for my application,

Application: Smart Speaker ,2 pcs 8W Speaker，PA will choice TAS5805M ,  2-S 4.2V Li Cell,3000mAh/Cell ,Charger Current less than 2A , adaptor is 5V/2A or 9V/1.5A , system side maybe have total 6A demand

↧

WEBENCH® Tools/LM5085: LM5085 load 2A issue

January 2, 2019, 7:43 am
$
0
0

Part Number:LM5085

Tool/software: WEBENCH® Design Tools

Hi E2E,

I am using LM5085 with Webench.

VIn = 6 - 75V. The goal is to make a power supply for 12, 24, 48V batteries.
Vout = 4.2V
Iout = 2A

M1 = ZXMP10A18K
D1 = SBRD10200TR

The circuit works when there is no load but with a load of 2A the LM5085 stops runnning or don't work with VIN > 20V.

Can you help to resolve this issue?

Thanks,

↧

TPSM84212: Is there a 3D step file I can download for the TPSM84212?

January 2, 2019, 7:50 am
$
0
0

Part Number:TPSM84212

Is there a 3D step file I can download for the TPSM84212? My application is pick & place equipment design.

↧
↧

TLV1117-33: 3.3V applied to voltage regulator output and input left floating, acceptable?

January 2, 2019, 8:02 am
$
0
0

Part Number:TLV1117-33

In Figure 27. Typical Application Circuit of TLV1117LV33DCYR, SBVS160B –MAY 2011–REVISED FEBRUARY 2015; will the voltage regulator be damaged if 3.3V is applied to the output while the input is left floating?

↧

LM5122: LM5122 no output

January 2, 2019, 8:41 am
$
0
0

Part Number:LM5122

  • I used LM5122 to design a product, as shown in the schematic diagram.I'm debugging now, but I find LM5122 no output.
  • And VCC is 7.5V, BST is 23.4V. And Input voltage is 13V. It seems normal.

    • Is there any problem with my schematic?

    • Thanks!

↧

BQ35100EVM-795: Unable to set EOS mode via bqStudio Advanced Comm

January 2, 2019, 8:55 am
$
0
0

Part Number:BQ35100EVM-795

I am not able to set EOS mode following the Advanced Comm Data Flash example in section 3 of slua790 (Using I2C Communications)

My setup is EV2400, bq35100EVM and bqStudio (v1.3.54.1).

The fuel gauge is initially in the default Accumulator mode.  Reading and writing Operation Config A (as shown in the example) appear to succeed.  After the write, I perform another read to ensure EOS mode has been set.  The result indicates that the fuel gauge is still in Accumulator mode (still 0x80 instead of 0x82).

A screen capture of that read-write-read process is attached.

 

Note that the eval setup is working, as I'm able to set EOS mode using the red/green cell UI of the Data Memory tab.

↧
Search

BQ35100: Power consumption while device disabled

January 2, 2019, 9:03 am
$
0
0

Part Number:BQ35100

Hi,

I am using BQ35100 in my design to monitor a single cell LiSoCl2 battery. I measured that the current consumed by BQ35100 when GE=0 is around 40uA, with a 600uA peak every one second. As per datasheet,the current consumption during GE=0 should be 50nA. I have isolated all other parts in the circuit to ensure the power consumed is by BQ35100. Can anyone please help me to understand what am i missing here?

Thanks,

Alwin

↧
↧

BQ78Z100: BQ78Z100 cannot returns to Normal mode from Shutdown mode

January 2, 2019, 9:10 am
$
0
0

Part Number:BQ78Z100

Our company has made 4000pcs battery pack with bq78z100. In order to reduce power consumption, before the battery is shipped, enter shutdown mode.

When we sampled the battery, we found that 6pcs of the battery could not exit shutdown mode. And I setting Charger present Threshold 3000mV.

Now it is suspected that the bad battery did not enter shutdown mode completely, because the bad battery, after sending the shutdown command, the voltage of the Pin10 FBI chip is about 7V, which is the same as the Pack voltage. After entering shutdown normally, the voltage of the Pin10 FBI chip should be zero.

Can someone give me some good advice?

Thanks a lot!

↧

LMZ30602: Land pattern for R-PB1QFN-N39

January 2, 2019, 10:33 am
$
0
0

Part Number:LMZ30602

Is there a land pattern available for LMZ30602RKGT that uses RKG (R-PB1QFN-N39). The datasheet says refer to spate sheet for the sizes of the 3 thermal pins and I cant find it anywhere.

↧

TPS2378: The APD function of TPS2378

January 2, 2019, 11:39 am
$
0
0

Part Number:TPS2378

Hi,

For the external adapter application as the picture below

1. If TPS2378 get power source only from external 12V adapter, then TPS2378 get 12V at VDD and about 1.5V at APD, is those voltage could make TPS2378 turns off internal hot swap MOS?

2. If yes, then what is the minimum VDD and APD voltage could make internal hot swap MOSFET tures off?

(what is the minimum voltage for external adapter )

3. What is the exactly condition for APD function? Only APD voltage above 1.5V? Or need VDD for internal logic usage?

Thank you,

C.T.

↧

LM5009: LM5009

January 2, 2019, 11:53 am
$
0
0

Part Number:LM5009

I was reading in a locked thread for the LM5009 that conducted emissions may be reduced by adding a series resistor to the boot cap.  What would be an appropriate resistor value?

↧
↧

BQ40Z50-R1: CHEm ID for BQ40z50-R1 for Moli-Cel INR-18650-M30A

January 2, 2019, 11:59 am
$
0
0

Part Number:BQ40Z50-R1

Posting for my customer:

Do you know what the closest CHEMID is for the MOLICEL INR-18650-M30A?   If not, I will have to do the cycle and Mathcad matching process, since this cell is not listed in the latest CHEMID version684 which I have installed.

I can sent the Battery Spec sheet by email if needed.

Thanks!

↧

TPS5420: Constant current output via sense current feedback

January 2, 2019, 12:22 pm
$
0
0

Part Number:TPS5420

Is it possible to get stable operation of the TPS5420 buck converter by measuring the output current via a sense resistor and MAX4372H current sense amplifier (for example), and feeding the output voltage to the VSENSE pin? What type of compensation network would be required to make this work? I've looked through the datasheet examples and the SLVA237C Application Report regarding stability with ceramic and aluminum output capacitors, but I am having some trouble translating this information for use with a current sense amplifier in the feedback loop.

↧
Search

BQ24232H: Can I use bq24232H for 3.8V Li Ion Battery?

January 2, 2019, 12:24 pm
$
0
0

Part Number:BQ24232H

I find myself required to do a little "sideways" engineering.  I must intercept the battery charger / power management on an existing product, from China no less.  The existing product has a battery labelled 3.8V Li Ion, 13.3Wh.  When fully charged and not under load, it reads higher than 4.25V.  I haven't done any LI Ion battery charging in the past.  Can I use the BQ24232H for this?  Can I test with the BQ24232HEVM-608 ?

↧

BQ24765: BQ

January 2, 2019, 1:31 pm
$
0
0

Part Number:BQ24765

When using the 24765 to control the charge of a LION battery, how would the host typically differentiate between a fully charged battery and a battery disconnect?

↧
↧

LMG3411R070: Junction Temp (Tj)

January 2, 2019, 3:28 pm
$
0
0

Part Number:LMG3411R070

Dear TI,

For developers, only the case temperature of the device can be measured.
What is the formula for converting the case temperature to the junction temperature?

  • Tj = θja x Pd + Ta or Tj = Ψjt x Pd + Tc
  1. θja: Thermal resistance [°C / W]
  2. Ψjt: Thermal resistance between package top center[°C / W]
  3. Pd: Power consumption [W]
  4. Ta: Ambient temperature [°C]
  5. Tc: Package Top Center Temperature [°C]
Is this formula correct? If so, how do I apply # 1 and # 2?
↧

UCC28070: Soft start capacitance

January 2, 2019, 4:29 pm
$
0
0

Part Number:UCC28070

Hi TI,

Application note shows that Css(soft start) needs to be set to at least the same values as the Czv capacitor or larger.

Please let me know the reason. if Css is set smaller than Czv, what can be problems?

↧

CCS/BQ27510: BQ27510DRZT-G3 configuration without power

January 2, 2019, 4:57 pm
$
0
0

Part Number:BQ27510

Tool/software: Code Composer Studio

Dear sir:BQ27510DRZT-G3 through IIC configuration information, power failure will restore factory?

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