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EM1402EVM: Active balance problem with some cells

September 23, 2018, 9:14 am
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Part Number:EM1402EVM

Hello,

I'm using the EM1402EVM to perform active balancing with a 12V lead-acid battery.

I implemented the code exactly as it is in the code example, but when I try to balance just half of the cells really balance the other ones reports a fault as FAULT_INI signals gets high

Which is really curious is that the cells that are reporting problems are cells 2, 3, 4, 5, 11, 12 and 13. It seems that there is some problem with the message that has to be send through the SPI but I have no idea where is the mistake as the code is the same as the code example.

Following the is a screenshot of the code that is managing the balancing procedures:

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TL494: TL494- DC-DC converter -metal core constant current 200W module

September 23, 2018, 2:09 pm
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Part Number:TL494

Hello friends. I want to make an output in this PWM so that dc dc conwerter I can control it using a microcontroller. Does anyone know how?

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BQ21040: ISET questions

September 23, 2018, 7:15 pm
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Part Number:BQ21040

My Customer is working a design using the bq21040 and there are a couple of questions regarding the ISET resistor.

1. The charger will be used to charge a small battery. Desired fast charge current is 35 mA.  The Electrical Characteristics show the fast charge setting range is 10mA to 800 mA.  However, several places in the texts mentions the charge range as 50 mA to 800 mA. Will the device support 35 mA? If so,  I assume the KISET for this setting is 527 based on the spec table. 

2. Assuming fast charge = 35 mA is OK,  this would make the termination current =  3.5mA.  Can the device detect this low current? There is no load other than the battery when charging.

3. I need more clarification on the ISET short test. The data sheet indicates the load current needs to be greater than 80 mA to detect a shorted ISET resistor.  The power-up flow chart indicates there is a short test performed at 100 mA during power up. After power up, how is a short ISET resistor detected? It seems that if the Iset resistor shorts or drops in value during normal charge operation,  the charge current will increase due to the lower resistance.If so, how long does a short detection take?  With a charge current at 35mA, we are worried about overcurrent conditions. 

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TPS61089: Vout =12v ,Iout=4.5A

September 23, 2018, 10:18 pm
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Part Number:TPS61089

Hello,

I am designing a boost circuit using the IC TPS61089 Parameters of the circuit are mentioned below :

1)Input parameters = batttery powered rated 4.7v 7000mAH 1C discharge rate.Min Vin(min)=3.3V.

2)Output Parameters = Vout=12v and Iout=4.5A.

Below is the schematic that i have designed is this design correct as per my output parameters or any changes are there.

I tried to simulate the circuit in the web-bench tool but not getting results.

So Kindly provide solution as per the output parameters...!!! 

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TPS22918: Usage of load switch output when the external input is applied

September 23, 2018, 10:54 pm
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Part Number: TPS22918

Hi Alek,

We have used TPS22917 IC as you have suggested which will add only reverse blocking protection compare to TPS22918 load switch. We are seeing difference for the CT pin as it is connected to GND in the TPS22918 datasheet and it is connected to VCC in the TPS22917 datasheet. We have used TPS22917 IC and connected to GND and please let me know what will happen if it is connected to GND. Please find the attached images for your reference.

Please let me know why CT circuit is different in both datasheets. 

Regards,

Sathyasai

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SM74611: Smart Bypass Diode (SM74611) in Simulink?

September 23, 2018, 11:25 pm
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Part Number: SM74611

Does anyone have the smart bypass diode (SM74611) in simulink/matlab?

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TPS92691: TPS92691 Design Question

September 23, 2018, 11:30 pm
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Part Number: TPS92691

Hello support team,

I have question about buck-boost mode for TPS92691, It base on PNP transistor in circuit implement output OVP.
There is mean both kept output voltage and increased input voltage, it will threshold INPUT OVP, right?

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BQ24075: BQ24075 layout questions and concerns

September 23, 2018, 11:59 pm
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Part Number: BQ24075

Hi,

We are using BQ24075 charger and BQ27426 fuel gauge. The first pass design had problems and we could not get the charger to work so we are redesigning and have few questions.

1. Should the thermal pad for BQ24075 (on which we put  5 ground vias to connect to the ground plane below -  ground is 2nd plane in the board) be also connected directly to the charger's ground pin (pin 8) at the top  level? In other words should we short the thermal pad  (with the vias present on thermal pad) directly with the charger's ground pin with a trace at the top level? We have seen reference designs at TI's site where a trace was used to short with the thermal pad and charger's Vss pin and also layouts where the scheme was not followed at all but  grounds were only  shorted through the plane only. 

2. Should the charger's ground pin (8) be directly connected to the the batter pack's -ve terminal with a wide trace at the top level or connected through the ground plane will be good enough?

3. Should gauge vss pin/bump ( center bump of the 9 balls BGA package) be connected to the battery's -ve terminal and charger's ground pin (pin 8) with a metal trace or they all could be connected through the ground plane? For gauge's BGA package (a cell phone part) there is no additional space at the top level to escape a ground trace, so the connection can only be through the ground plane, would that be a problem?

4. Should the decoupling cap's  Vss terminal for the charger and battery pack's -ve terminal and fuel gauge's Vss bump be  all connected though the ground plane  or they all need to be shorted at the top level with trace? There is a space crunch to short all the Vss pin, bump and capacitor's terminal with a trace at the top level, will there be any problem if all the ground terminals are shorted only through the plane below which they usually are in any design? 

It will be very helpful to know which ground terminals must be shorted at the top level for the charger and gauge with a trace in addition to the connection through the plane.

Thank you much for helping.

- Andy

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TPS5430: C2 (0.01 uF) failure in working PCB (referring to Application Circuit )

September 24, 2018, 12:09 am
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Part Number: TPS5430

We are using TPS5430 in production of our medical product, with annual consumption of 5000 TPS IC. Circuit is same as application circuit given.

Refering to application circuit,

R1 = 59 K

R2 = 15K

Vo = 6V ( Load 6V/10W lamp load )

Vi = 12V ( stable 12V from SMPS)

We observed that after few days of proper operation, TPS5430 misbehaves. It shows less voltage (~ 2.7V). Reason we found is C2 (0.01uF) failure. Because after replacing C2, it works properly.

C2 Part Number:

Kemet-C0805C103K5RACTU

Please help us to find root cause of Capacitor failure.

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BQ24092: BQ24092 PRE_TERM left floating

September 24, 2018, 12:52 am
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Part Number: BQ24092

Hi,

Can the PRETERM pin be safely left floating?

Reason for my doubt is datasheet (version August 2015) states "If left floating the termination and pre-charge are set internally to 10/20% respectively" (page 21). However description table (page 4) states "Expected range of programming resistor is 1k to 10k) and under recommended operating conditions (page 6) Rpre-term is listed as MIN 1K, MAX 10K.

Thanks in advance for your assistance.

Regards,

Dan

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BQ27220: Configuration of discharge voltage

September 24, 2018, 1:15 am
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Part Number: BQ27220

Is it possible in to easy configure the minimum discharge voltage to be 3300mV, without programming too many different registers in the device?

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TPS2010: Internal FET

September 24, 2018, 1:29 am
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Part Number: TPS2010

Hi all

Would you mind if we ask TPS2010 and TPS2030?

Do the Internal FET of these devices have back to back FET configuration?
Because our customer considers whether this device is bidirectional or not.

Kind regards,

Hirotaka Matsumoto

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UCC28700: UCC28700

September 24, 2018, 2:01 am
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Part Number: UCC28700

Hello Sir,

Iam designing dc-dc converter for auxiliary supplies using UCC28700 having following requirements:

Vin :177-318 Vac and i have multiple ouputs like (5V,400mA ; 15V,20mA ; 12V,10mA ;  -15V,20mA)

In the datasheet of UCC28700 , there is a design of only one output.

Can I have multiple ouputs using the same controller UCC28700.

For each output, the value of each component changes in the design. how to evaluate?

If i have to design for multiple ouputs , what are the calculations for each component ? and also schematic what you have provided in the datasheet of UCC28700 remains same ?

Thanks 

Regards

Rajashekar

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LM5170EVM-BIDIR: Output voltage control

September 24, 2018, 2:05 am
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Part Number: LM5170EVM-BIDIR

Hi TI,

V set on HV side controlling is not happening. Please clarify what are the jumpers need to connect & I set A/ I set D is it required to control the output when on board Voltage control is enabled. 

When we enabled on board analog voltage control loop on HV side which is 58.07VDC is not maintaining. the output voltage is going up to 69vdc.

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UCC28180: Can UCC28180 be utilized for DC-DC Applications ?

September 24, 2018, 3:00 am
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Part Number: UCC28180

Can we use this IC(UCC28180) for DC TO DC application. i.e input to the converter is not a full wave rectified waveform, it is pure DC voltage. 

 Can i still used this IC for closed loop operation with out PFC  on a input DC Application?

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LM5160-Q1: Fly-Buck and Flyback Topology Selector

September 24, 2018, 3:26 am
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Part Number: LM5160-Q1

Hi,

Our customer is considering using LM5160-Q1 in Fly-Buck-Boost topology. So they estimate external parts by Fly-buck and Flyback Topology Selector. But the cells part of compensation in sheet of Fly-buck-boost is protected and they can't use it. Could you provide unprotected version?

Best Regards,
tateo

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TINA/Spice/UCC28180: UCC28180 unencrypted Pspice model

September 24, 2018, 3:30 am
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Part Number: UCC28180

Tool/software: TINA-TI or Spice Models

Hello ,

Please let me know how can i get unencrypted Pspice models for UCC28180 and UCC28070.

Thanks,

Pradeep.

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BQ27510-G3: BQ27510-G3 Programming data flash parameters

September 24, 2018, 3:34 am
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Part Number: BQ27510-G3

Hi all,

While I was updating flash parameters using the instructions found in the bqfs (which was created by the bqStudio 1.3.54.1), due to a debugging error the process stopped midway. After this incident, I have been trying to communicate with the gauge through EV2300 with no success as it does not respond on address 0xAA nor 0x16. I have also attempted to exit ROM mode and use a srec file to program an image file to the gauge again, but it did not work either.

Is there anything missing me at this point? Attached to this post follows part of the dashboard of the bqStudio.

Thanks,

Iruel

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LMZM23601EVM: LMZM23601 EVM went damage

September 24, 2018, 4:50 am
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Part Number: LMZM23601EVM

Hi,

The LMZM23601 EVM  went damage as i check the function. After a repeated switch on the power (vin), the modul is without function.
The paramters were: Input 36V, Output 5V 1A, Last 5 Ohm || 470uF

Now the supply curent is 1,4mA and the output voltage is zero. No Bursts are to measurement at the inductor. Without a supply, i measure 1,25 Ohm between one conductor of the inductor and ground.
I think, the pull down mosfet is shorted and defekt.

Is the capacitor of 470uF to big?

Best Regards, Ben

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LM2577: STEP UP VOLTAGE REGULATOR DESIGN ISSUE

September 24, 2018, 4:51 am
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Part Number: LM2577

Hello eveyone,

I need to step up dc voltage from 12V to 13.7V and 1.5 Amper. I have tried calculations in datasheet of the LM2577 and found Rc=1k Ohm , Cout=470uF, Cc=220nF with L=100uH.

First problem is that it gets so hot that in 30 seconds you can not touch it. Second is the voltage at the output is not constant. And third is It can not deliver the rated current at the output. What do you suggest? Using a different component or any change in values of R,C and L?

Any help will be appreciated.

Thanks in advance.

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