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Power solution for LCD panel

March 11, 2019, 10:13 am
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Hi Team,

my customer needs a panel power solution to meet the requirement(VGH/VGL/VCOM) as following picture, may i have your help to get an integrated solution for them? thanks.

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LMZ12003: There is an error in the data sheet

March 11, 2019, 10:16 am
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Part Number:LMZ12003

Hi, Plannimng to use LMZ12003 in my new design, found a mistake in the data sheet SNVS636O  December 2009 revised august 2015

Equation 20 uses Rthjc , while it should use Rthja I believe.

Could you please confirm that and if possible correct?

Thanks

Sebastian

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TPS770: Higher voltage alternatives

March 11, 2019, 11:00 am
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Part Number:TPS770

I am using the following regulators and need to increase the input voltage to 12V.  I would like to use the same package and Enable Pin is Active LOW.   Can you recommend a 12Vin capable part?

Part #1: TPS77033DBVR

Part #2: TPS77001DBVR

 

 

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BQ78350: commands in bqstudio

March 11, 2019, 11:28 am
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Part Number:BQ78350

Hello,
customer has to use bqstudio and wants to set commands for
- seal/unseal
- full excess
- autentifcation

Is there any description how to do that? If not, how can he do that in bqstudio?

Regards, Holger

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TPS65911: VDD1-SMPS not putting out correct voltage

March 11, 2019, 11:46 am
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Part Number:TPS65911

Hello,

When we power up, we try to set the voltage of VDD1-SMPS output to 1.35VDC via I2C communication but sometime it outputs to 2.7VDC.

Has there been any Errata/Bulletin issued related to this voltage increase issue?

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TPS54521: Output capacitors 4x470 uF

March 11, 2019, 12:17 pm
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Part Number:TPS54521

Hello,

I would like to use this circuit to power my DSP C6654 with power draw of 3A worst case. I want to use the circuit on the first page or the 5A circuit. Do I need 4 x 470 uF at the output?

http://www.ti.com/lit/df/tidr731/tidr731.pdf

I have this part in stock - EEFGX0E471R

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BQ51051B: Question about disabling FOD and charge termination

March 11, 2019, 1:03 pm
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Part Number:BQ51051B

Hi,

I have a design that I am getting ready for production, and I would like to maximize the amount of current that I am able to safely transmit with reliable results.  My wireless coils are both around 20 mm, and the coil distance is maybe 6 to 7 mm.  Given my small coil size and extra distance, my practical desired charging current is around 400 mA.  I have R1 = 578 Ohms and RFOD = 187 Ohms.  When I put these values in my charger, it will try to charge but fails after a couple of seconds with a red flashing light on the charger.  I decoded the response to the digital ping during this error condition, and it appeared to be sending a RX signal strength packet to the charger, which appeared to be correctly sent according to the checksum of the packet.  This is why I suspect that FOD is the problem.

If I go up to 1K for R1, which is around 250 mA charge current, I can get the system to charge reliably.

I would like to disable FOD, and my understanding is that by increasing RFOD it will make the system less likely to fail.  Can I take RFOD all the way up to RILIM, with R1 being a 0 ohm jumper, to completely disable FOD?

The other problem that I am having is that at the 250 mA charging current, with Rterm at 2.2K, the charge will terminate when the battery is full, but will almost immediately restart the charging.  This will occur repeatedly.  Is this due to the very low termination current of around 25 mA?

Thanks,

Garry

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UCC27519A-Q1: Maximum Allowable Power Dissipation (under DC) given absolute ratings.

March 11, 2019, 1:10 pm
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Part Number:UCC27519A-Q1

Hello, I am working on derating this part and have been struggling to figure out how to find out what is the maximum power that this device can dissipate without getting damaged. I found the rated max voltage VBR (20V) and max rated current (4A). I am working on a DC derating report and cannot really give you a frequency value that I will eventually be working with. Could someone help me figure out what this parameter value is? Thank you

UCC27519A-Q

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TPS61021A: Abnormal Output/Input behavior under load

March 11, 2019, 1:22 pm
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Part Number:TPS61021A

Hi TI Expert-

Our implementation of this regulator is exhibiting dips in the output when connected to a dynamic load.

Implementation:

Setup outputs a stable 3.6V from an input range of 1.5-3.5V (supplied by batteries) with static loads. When we open a load switch to an IC with a dynamic load profile form 100-500mA, the regulator's output/input voltage behavior shows repeating dips of up to 100mv.

More information and test data available via email and subject to an established NDA.

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BQ25713EVM-017: powering eval kit with 1S2P pack

March 11, 2019, 1:29 pm
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Part Number:BQ25713EVM-017

What is the recommendation in configuring this eval kit where it is powered only by a 1S2P battery with a range of (4.2 to 2.5V) and want to boost the vsys rail to 3.4V when the battery goes below a threshold of 3.4V?

Thanks,

Brian 

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TPS65130: schematic review

March 11, 2019, 1:47 pm
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Part Number:TPS65130

Hey guys,

Can you take a look at my customer's schematic?

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TPS54521: Output Capacitors

March 11, 2019, 2:20 pm
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Part Number:TPS54521

Hello,

I would like to use this circuit to power my DSP C6654 with power draw of 3A worst case. I want to use the circuit on the first page or the 5A circuit. Do I need 4 x 470 uF at the output?

http://www.ti.com/lit/df/tidr731/tidr731.pdf

I have this part in stock - EEFGX0E471R

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TPS55340: pspice simulation problem

March 11, 2019, 2:45 pm
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Part Number:TPS55340

Hi

I am using Capture cis v 9.2 

I downloaded a TPS55340 Spice model from below link

http://www.ti.com/lit/zip/slvm589

I draw a schematic but when I try to simulate in Time Domain I get many errors like this::

*Libraries:
* Local Libraries :
* From [PSPICE NETLIST] section of C:\Program Files\Orcad\PSpice\PSpice.ini file:
.lib "D:\App Electronic\Orcad\9.2\Tps\TPS55340_TRANS.lib"
.lib "nom.lib"

*Analysis directives:
.TRAN 0 5m 0 10u
.PROBE V(*) I(*) W(*) D(*) NOISE(*)
.INC ".\test-SCHEMATIC1.net"

**** INCLUDING test-SCHEMATIC1.net ****
* source TEST
R_R6 0 N03746 3.48k
C_C6 0 N00873 1u IC=0
V_V1 N00873 0 8Vdc
R_R1 0 N01127 10k
D_D2 N00773 OUTPUT D1N4006
R_R2 N01127 OUTPUT 86.6k
L_L1 N00873 N00773 .4uH IC=0
R_R3 N05544 0 1k
C_C1 0 N03912 1n
X_U2 N00773 N00773 N00773 N00773 N00873 N00873 N03912 0 0 0 0 0 0 0
+ N05544 N01127 N03746 TPS55340_TRANS PARAMS: SS=0
C_C3 0 N03746 150p
C_C5 0 OUTPUT 2.8u IC=0

**** RESUMING test-schematic1-regulator.sim.cir ****
.END

**** FROM LIBRARY "D:\App Electronic\Orcad\9.2\Tps\TPS55340_TRANS.lib" ****
.subckt TPS55340_TRANS SW_0 SW_1 PWPD SW_2 VIN EN SS SYNC AGND
+ NC_0 PGND_0 PGND_1 PGND_2 NC_1 FREQ FB COMP PARAMS: SS ={SS}
$CDNENCSTART
$
ERROR -- Invalid device in subcircuit
eee8c5c7a2bc4b01f045f303678664e7916da0bae22e8cb0bba041dd67c69ce448ea70148a9ac1670c8926c1ac5057c8ccfcd77bf87ca9dc1954a0d40380dfba
--------------------------------------------------------------------------------------------------------------------------------$
ERROR -- Missing node
1cb0ffc41a0dc74b489522618a186304f45310c19b6b8ee556d6c689f7c29f3c95ea64efaa45d8004a0b0e3076b22b7c644126c9831a96bd09838d46f24c6dc7
$
ERROR -- Invalid device in subcircuit
77b2c329db2a3cfae75e8f589193cb813b341e6bf22d1f2bf0f7908f02418b785ed1be5c5cea0bec67a883ad067f51e782511452243b09872ae77b5fa8b5d5b6
$
ERROR -- Invalid device in subcircuit
7d5dcf081b4444e675963efd3ee34e160024d804c4775bfd11f34f20573d9eaea789ef217c5275560abe6479c620440ddfd0c1f399eb3726431b26ce74e21f60
$
ERROR -- Invalid device in subcircuit
cdaa385411811e27bfd81d659a09e4b32637e9cac2aa5cea2cecad1ebf804c4bf467148f06ca8e437b0f67a2db6e4545faf02c36e6efa6739117bef1127244cc
--------------------------------------------------------------------------------------------------------------------------------$
ERROR -- Missing node
1cb0ffc41a0dc74bddd0db0cfe8b73ce8dc6150e9752de32d9adbf15a7a73a56b88ca6e26d3ad9f6c5d9e3678fccb1f5644126c9831a96bd09838d46f24c6dc7
$
ERROR -- Invalid device in subcircuit
a766339312b9c1f231da69c16c3a07c812483f41299ee511fe63de7a3ed49510c706710efe56e06e56d6c689f7c29f3c977733d3ac09a231e8f3cf048c0c42ee
$
ERROR -- Invalid device in subcircuit
3b79d1cd0e073c32d1e69f27d728e85660b4aca0abacdc9a3ef206cf6660d69cde145d20491cdc9014d907c8d06c5899efcf94a2c311551ebb8d5e3e323c2a8e
$
ERROR -- Invalid device in subcircuit
0668808965588ee3bc2043ce4ff4da7812483f41299ee511fe63de7a3ed49510ecbcc14baeb918a651cfd291ae71091614e2ae4a69772d061c18d5f9bd177359
$
ERROR -- Invalid device in subcircuit
61e1c4516381303d3314648bc084b8ea3b341e6bf22d1f2bf0f7908f02418b78a84c49839850a61adb40290624dd5ce1c7b10b7c335675126e05108940e93c75
$
ERROR -- Invalid device in subcircuit
60877ff0912fae9ed1e69f27d728e85660b4aca0abacdc9a3ef206cf6660d69cde145d20491cdc9014d907c8d06c5899efcf94a2c311551ebb8d5e3e323c2a8e
$
ERROR -- Invalid device in subcircuit
e22509011b76ac803f67e2675b8c9c09706b807646b8037156d6c689f7c29f3c97c08816192bdfcba4cd0404714b7e719f7df7e1d8537137e543c34c8d328156
--------------------------------------------------------------------------------------------------------------------------------

Is there any problem in my work?

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TINA/Spice/UCC28070: Designing 1000W supply

March 11, 2019, 5:00 pm
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Part Number:UCC28070

Tool/software:TINA-TI or Spice Models

Using UCC28070 for interleave PFC.

When simulating in PSPICE the model from TI website, I don’t see the input current getting in phase with the voltage. It seems the PWM is not working as I don’t see the current waveshape like a enveloped sinusoidal.

1. Can help to advise on how to make PSPICE simulation work in interleave PFC?

2. Can help to advise the circuit setup to achieve a 1000W design using UCC28070?

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LP38798: Consult about Low Noise

March 11, 2019, 6:30 pm
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Part Number:LP38798

Hi,

     I have some question in low noise application.

     I want to use LP38798 drop volt to 12V, and use LP2985 drop 9V to OPA use.

     I see datasheet define LP38798's noise is 5uV, LP2985's noise=30uV.

     What is the noise output?
      Is the noise LP38798 5uV or LP2985 30uV?

thanks.

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TPS40425: Does TPS40425 need to check loop gain?

March 11, 2019, 6:36 pm
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Part Number:TPS40425

Hi Sir

Does TPS40425 need to check loop gain?

Form EVB sheet we need injection signal to R8(EVB), how many signal voltage we need ipuut? is also 10mV?

and what frequency range we need to set?

                                                                        Bogey

                                            

                                                         

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LM3478: LM3478 Over Voltage Protection

March 11, 2019, 6:45 pm
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Part Number:LM3478

The Over Voltage Protection will cause the drive pin to go low, forcing the power MOSFET off.

So the over voltage goes for the output trough the L inductor.      It is not stopping the over voltage to go to the output!!!!!!!

Is it a silly design? Or I am the silly?

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DCP021212D: Outputs higher voltage than spec.

March 11, 2019, 7:02 pm
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Part Number:DCP021212D

Hello,

In order to get isolated 24V power supply, I designed and implemented a circuit with DCP021212DU as below.

By the way, the measured values of VCC24V_ISO is about 28V and COM to +VOUT/-VOUT are 14V.

Please give me an advice to get correct output voltage.

For your reference, DNP means "do not place".

The purpose of U25 and few parts of around it is to increase current capability in case.

Thanks.

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UCC24624: Ucc24624 gate driver waveform issue

March 11, 2019, 7:06 pm
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Part Number:UCC24624

Hello TI guys:
i use the UCC24624 to replace the MP6924A, but the UCC24624 gate drvier waveform has some issues, It looks like the waveform is asymmetric, please refer to the attachment as attached.

Could you give me some advice to solve this problem, thx

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Does TI still supply or support this particular part, LV2862XLVDDCR?

March 11, 2019, 7:44 pm
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Hello fellow TIs

I am currently working on a project which involves high AC voltages.

I found a particular part, LV2862XLVDDCR.

However, I tried searching on the main page or forum but to no avail.

Has TI stop supplying this particular part or has it change its part no?

Thank you for assistance.

Daniel.

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