READ_VOUT command (8Bh) use VID format, To convert READ_VOUT raw value to decimal number, use the following format…VOUT = OFFSET + (READ_VOUT)*STEP_SIZE.

If use MFR_SPECIFIC command (D4h), How to convert READ_VOUT raw value to decimal number?

Is where need to convert for Linear16 format conversion?

If yes, I not sure how to get exponent N in linear-16 data format.

↧

TPS65135: Generating positive and negative voltages with different values at the same time

March 11, 2019, 9:07 pm

≫ Next: BQ27510EVM: Data memory and learning cycle

≪ Previous: TPS53659: I want to get VOUT "real data" from Reading MFR_SPECIFIC_04(D4h) by PMbus.

Part Number:TPS65135

I'm using this DC converter in my PCB to generate -5 V which will power the opamp (negative power supply terminal, the postive power supply of the opamp +5V will come from outside) and +3.3V to power up the MSP430 so

Vin is +5V, Voutp=+3.3V, Voutn=-5V

My question is can I use this converter to generate these two different values at the same time? by mean they are not symmetric for example in the data sheet they mentioned +5V and -5V .

Thanks

↧

BQ27510EVM: Data memory and learning cycle

March 11, 2019, 9:54 pm

≫ Next: BQ25898: I2C reset

≪ Previous: TPS65135: Generating positive and negative voltages with different values at the same time

Part Number:BQ27510EVM

I have purchased bq27510 evm and I am trying to perform a learning cycle. When I try to set the initial parameters and write it to the gauge it shows error "value is beyond maximum value defined for parameter: Calibration.Data.CC Gain. I am not sure what to do ..

Also I am unable to set the State of charge . It always shows its 0%.

Thanks in advance

↧

BQ25898: I2C reset

March 11, 2019, 9:56 pm

≫ Next: LM5155-Q1: Does LM5155 has internal Vgs resistor

≪ Previous: BQ27510EVM: Data memory and learning cycle

Part Number:BQ25898

Hello,

Our customer is looking for a way of hardware reset all of I2C registers. Would you mind letting us know any other way to reset the registers except for VBAT < VBAT UVLOZ & VBUS < VBUS UVLOZ .

best regards,

↧

LM5155-Q1: Does LM5155 has internal Vgs resistor

March 11, 2019, 10:00 pm

≫ Next: TPS62160: Adjustable output voltage type of TPS62160 Vref tolerance

≪ Previous: BQ25898: I2C reset

Part Number:LM5155-Q1

Hi team,

Does LM5155-Q1 integrate internal gate to source resistor inside the driver circuit? My customer wanted to know if they need to add external 10kohm from gate to source of MOSFET, which I did not see in the reference design.

Many thank.

Best Regards,

Wei-Hao

↧

TPS62160: Adjustable output voltage type of TPS62160 Vref tolerance

March 11, 2019, 10:04 pm

≫ Next: BQ27441-G1: External resistance

≪ Previous: LM5155-Q1: Does LM5155 has internal Vgs resistor

Part Number:TPS62160

Hello team.

I have a relative question of the following E2E URL about TPS62160 Vref tolerance.
https://e2e.ti.com/support/power-management/f/196/t/668187?tisearch=e2e-sitesearch&keymatch=TPS62160

The customer mentioned that If the maximum Vref tolerance is +/-2%, so they can use TPS62160. In the datasheet, the tolerance of output voltage is including Internal divider. The customer would like to use the adjustable type of TPS62160, so would like to know TPS62160 Vref tolerance?
Would you please share maximum Vref tolerance?

Your advice would be so appreciated.

Best Regards,
Akihisa Tamazaki

↧

BQ27441-G1: External resistance

March 11, 2019, 10:25 pm

≫ Next: LM5085: What is the function of 'D1' schottky diode in LM5085 typical application ckt?

≪ Previous: TPS62160: Adjustable output voltage type of TPS62160 Vref tolerance

Part Number:BQ27441-G1

Hi All,

We are use bq27441-g1.

In our case distance between the battery & sensor pin is bit long.

May constitute 100mOhm as external resistance between battery & sensor pin.

Will this impact gauging or learning cycle? or having big external resistance a cause of concern?

Appreciate your feedback.

Regards,

Zahir

↧

LM5085: What is the function of 'D1' schottky diode in LM5085 typical application ckt?

March 11, 2019, 10:27 pm

≫ Next: TPS61220: TPS61220

≪ Previous: BQ27441-G1: External resistance

Part Number:LM5085

Hi,

I am not getting how D1 schottky diode is useful in LM5085 ckt? why cant we use any other diodes or zener diode over there?

Attached pic is for reference.

↧

TPS61220: TPS61220

March 11, 2019, 10:37 pm

≫ Next: UCC27712: Caps from gate to source

≪ Previous: LM5085: What is the function of 'D1' schottky diode in LM5085 typical application ckt?

Part Number:TPS61220

Hi,

From the datasheet, the TPS61220 is having an efficiency of around 80%. However, when I measured based on the circuit below, it only

come out to about 66%. I can;t figure out why there is a drop in the efficiency. Please help. Thank you.

VBAT - 1.5V @ 6.05mA

VDD_S - 1.9V @ 3.24mA

VFB - 500mV

PCB layout is as per datasheet recommendation. Both C1, C3 and C4 are placed 1mm of TPS61220

↧

UCC27712: Caps from gate to source

March 11, 2019, 10:40 pm

≫ Next: LP8860-Q1: LP8860-Q1 output abnormal under the temperature -25℃

≪ Previous: TPS61220: TPS61220

Part Number:UCC27712

Hello,

My customer was seeing spikes as shown in Image #1. They were able to remove the negative spike by adding C(L), Image #2, and they were able to remove the positive spike by adding C(H), Image #3.

Is this solution recommended by TI?
We were concerned more with C(H) which feeds back to the boot strap circuit. Any concerns from your end about this?

Note: the images below were collected with supply at 24V, but will need to function at 200V in the real application, C(H)=C(L)=0.1uF/400V.

Circuit

Image #1

Image #2

Image #3

Thank you,
Ryan B.

↧

LP8860-Q1: LP8860-Q1 output abnormal under the temperature -25℃

March 11, 2019, 10:54 pm

≫ Next: TPS53681: TPS53681 VREF OUTPUT ISSUE

≪ Previous: UCC27712: Caps from gate to source

Part Number:LP8860-Q1

Hi Team，

My customer use LP8860-Q1 in their cluster and it appear black screen and have no display. Such a phenomenon happened often when the temperature is under -25 ℃. When it appear black, the output of LP8860 is abnormal.

Does LP8860 have any bug under the low temperature? Could you please give us some advice?

↧

TPS53681: TPS53681 VREF OUTPUT ISSUE

March 11, 2019, 11:00 pm

≫ Next: TPS54719: 0.2A to 6A, good load transient and small size DC/DC solution.

≪ Previous: LP8860-Q1: LP8860-Q1 output abnormal under the temperature -25℃

Part Number:TPS53681

Dear all:

Test 10PCS TPS53681 sample, only 5 PCS is OK, others 5PCS VREF output votage abnormal,or 0V,or 1.2v,or 1.6v,or 1v,cause I2C can not connect. please help confirm why is the VREF output votage abnormal, thnak you!

↧

TPS54719: 0.2A to 6A, good load transient and small size DC/DC solution.

March 11, 2019, 11:14 pm

≫ Next: UA79M05CKVURG3 Pin Assignment

≪ Previous: TPS53681: TPS53681 VREF OUTPUT ISSUE

Part Number:TPS54719

Dear Sir/Ms.

We Promoted TPS54719 to customer but in webanch Load transient simulation, the voltage drop is too low (0.2V). customer's specification is 50mV, so customers will not consider this one.

Currently customer's first choice is Richtek RT5789A.
The datasheet of the RT5789B is below for you reference.
www.richtek.com/.../DS5789AB-01.pdf

customer's system requirement

1.
Vin 5V
Vout 0.9V
Iout 0.2~6A

2.
Vin 5V
Vout 1.8V
Iout 0.2~6A

3.
Vin 5V
Vout 1.2V
Iout 0.2~6A

IC Size (less than 3mmx 3mm x 2mm), switching frequency is best 1.5Mhz (>1Mhz)

Is there a more suitable solution? Is TPS56637 suitable?
www.ti.com/.../tps56637.pdf

Also look for RT5797 P2P DC/DC

Best Regards,

Kami Huang

↧

UA79M05CKVURG3 Pin Assignment

March 11, 2019, 11:15 pm

≫ Next: TPS25910: E-fuse solution suggestion

≪ Previous: TPS54719: 0.2A to 6A, good load transient and small size DC/DC solution.

We are designing the system using UA79M05CKVURG3.

But we couldn't see the pin assignment from Data Sheet.

Could you share the pin assignment of UA79M05CKVURG3.

The following from 1page of datasheet.

We can only see KC, KTP and KTP package.

↧

TPS25910: E-fuse solution suggestion

March 11, 2019, 11:21 pm

≫ Next: EM1402EVM: charging happening for 3 secs in active cell balancing

≪ Previous: UA79M05CKVURG3 Pin Assignment

Part Number:TPS25910

Dear Sir/Ms.

The customer's purchaser request RD is looking for 2nd source to SY6875A.
Before we have recommended TPS25910 and TS25940-Q1 but the specifications are a little worse. Is there a better choice than TPS25910 and TPS25940-Q1?

Customer specifications are as follows

END Product is SSD.
1. Max. Vin > 20V
1, Current limit should be at least 3A or more (to be adjustable)
2, support 5V and 3.3V input at the same time

4, there is discharge (currently SY6875A also has no discharge function)
5, has clamping function
6, support -40~85 degrees
7, adjustable SS time (not necessary, better)
8, there is PG pin (not necessary, there is better)

Would you please give us some advice?

Best Regards,

Kami Huang

↧

EM1402EVM: charging happening for 3 secs in active cell balancing

March 11, 2019, 11:22 pm

≫ Next: TPS563249: TPS563249 Min. soft Start time

≪ Previous: TPS25910: E-fuse solution suggestion

Part Number:EM1402EVM

(Please visit the site to view this file)hi leslie,

yes i am using the same EM1402EVM code with SPI commands. I am attaching the same. Please go through it.

Thanks,

Gargi

↧

TPS563249: TPS563249 Min. soft Start time

March 11, 2019, 11:50 pm

≫ Next: TPS562208: TPS562208/TPS563208 Min. Soft Start Time

≪ Previous: EM1402EVM: charging happening for 3 secs in active cell balancing

Part Number:TPS563249

Dear Sir/Ms.

May I know the min. Soft Start time? There is only 1.7ms in typical value. My customer want to know the min. value.

Best Regards,

Kami Huang

↧

TPS562208: TPS562208/TPS563208 Min. Soft Start Time

March 11, 2019, 11:53 pm

≫ Next: TPS65132: 5Vin -> +/- 5.7V/100mA solution

≪ Previous: TPS563249: TPS563249 Min. soft Start time

Part Number:TPS562208

Dear Sir/Ms.

May I know the min. Soft Start time? There is only 1.0ms in typical value. My customer want to know the min. value. Their requirement must be bigger then 0.5ms.

Best Regards,

Kami Huang

↧

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