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BQ40Z80: GPIO pin to control DSG and CHG MOSFETS?

October 21, 2019, 1:18 pm
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Part Number: BQ40Z80

Hello!

I'm trying to understand if I can use one of the GPIO pins for turning on/off the CHG and DSG mosfets.  Basically as a TTL signal on/off.    This would be very convenient, as my current schematic is goes from the bq40z80 controlled MOSFETS, into my 'soft-latch power switch' controlled mosfets.  It seems unnecessary, so I'm hoping I can control the bq40z80's MOSFETS "manually" instead.  

I know I can send a communication to the bq40z80 to do as I am describing but that only works if the FET_EN bit is off, which I don't want to turn off since that seems to undermine the functionality of the bq40z80.

Does this make sense?  Basically I'm looking to use the bq40z80 as an interface to act as a system power switch by making use of its FET control...  Is this possible?  Or is the bq40z80 limited to mosfet control strictly by its protection parameters?

Thanks!

-Chris

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TPS92682-Q1: Supply switching current Inquiry

October 21, 2019, 1:22 pm
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Part Number: TPS92682-Q1

Hi Team,

My Customer wanted to know since the Supply switching current (I_in-sw) is announced as 10mA (page 6 datasheet) when both channels are switching. What is the current consumption if only one channle is used (with SPI communication)? Is it the same as this value even only one channel is used?

Looking forward to your input.

Regards,
_Renan

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BQ25120A: Eagle Library

October 21, 2019, 1:36 pm
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Part Number: BQ25120A

Is it possible to get an eagle library with the footprint for this part anywhere? Sites like Ultra Librarian only have Eagle script files that recent versions of eagle cannot run. 

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BQ2022A: why bq2022a may abnormal if ramp times >200us?

October 21, 2019, 1:43 pm
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Part Number: BQ2022A

Hi Team,

As title, customer want to know the reason for this power up limitation.

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LM5069: Rpwr calculation EVM vs Datasheet?

October 21, 2019, 1:54 pm
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Part Number: LM5069

Hello Team,

What is the difference in calculating the Rpwer value as recommended in the datasheet vs what is given in the EVM manual.

EVM:

Datasheet:

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BQ25150: Battery charging time

October 21, 2019, 1:54 pm
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Part Number: BQ25150

I'm testing the BQ25150 with several different LiPo batteries, and the CV phase of the charge time seems excessive. I have the pre-charge set to 77.5mA, the fast charge set to 500mA, and the termination charge set to 50mA (10% of fast charge). With several batteries now in the 900mAh to 1000mAh range, I see that the CV phase of charging lasts more than 3 hours. I expected the entire charging process to be around 3 hours, not just the CV phase. Is this expected behavior? What can I do to speed up this process? 

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TPS5130: Tool to calculate for RC Compensation ciruit

October 21, 2019, 2:07 pm
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Part Number: TPS5130

Hi there,

I downloaded file SLUC263D for the RC Compensation calculation for the device TPS5130, but I could not use it. I need something "Tool => Add Ins =>Analysis Toolpak".

I don't have "Tool", please help.

Thanks,

Van

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TPS22810: blocking reverse current with external MOSFET connected to CT

October 21, 2019, 2:38 pm
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Part Number: TPS22810

Can we use the CT pin to connect the gate of an external second MOSFET to prevent reverse current? I know it will affect the soft start function, but I am more curious to whether any functionality issue might occur with this configuration.

Thank you!

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BQ40Z50-R1: Companion parts for BQ40Z50-R1 for USB charge

October 21, 2019, 2:41 pm
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Part Number: BQ40Z50-R1

I have a 1S4P 10 A-Hr Li-ion battery pack composed of 18650 cells that I want to charge via USB (or other external adapter).  What companion parts should I be looking at to be compliant with USB charging specifications and be stand alone?  When the battery pack is plugged in to my instrument, the I2C on the BQ40Z50 can be used as a fuel gauge, but it may be charged by itself where there is no host to program or monitor registers.  Ultimately, what I am looking for is the functionality of a standard USB battery pack where you put 5V in to charge, and you get 5V out.  

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BQ28Z610: Programming BQ28z610 and BQ25892. System Bring UP.

October 21, 2019, 3:02 pm
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Part Number: BQ28Z610

Hi, 

I made the battery management system by using EVMs ( Charger (bq25892) and Gauge (bq28x610) ) and Battery Management Studio GUI through EV2300. 

I can also communicate with these devices through my external processor by using I2C

NOW, I am getting my bare metal boards ( PCBS ) nothing configured on BQ25892 and Gauge BQ28z610

I need to program both BQ25892 and Gauge BQ28z610. 

Do you have example code?

Do you have a document to bring up these devices?  

Thanks and best regards, 

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TPS54428: Maximum Soft Start Time

October 21, 2019, 4:52 pm
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Part Number: TPS54428

Hi Expert,

Is there maximum soft start time spec limitation for TPS54428?

Thanks.

Allan

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TPS7A47: TPS7A4700 vout 3.3v

October 21, 2019, 1:00 pm
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Part Number: TPS7A47

Hi guys,

I'm  using with the TPS7A4700 and I want to get Vout of 3.3v

The Vin is 3.6v ,  is it possible??  In the datasheet is written something  with Vo(nom)  that the Vin should be either  greater  than 3v or  greater than Vo(nom) +1v.  What does it mean??  

In addition  the input capacitor  in my design  is 10uF  Tantalum capacitor  and the output capacitors are 4 capacitors of  10uF, each of them Tantalum  as well.  

Aviad.  

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UCC28911: Constant Voltage with Chosen Transformer

October 21, 2019, 5:31 pm
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Part Number: UCC28911

Understanding Constant Voltage and Constant Current regulation:

I am designing a 3.3V power supply with a maximum load output current of 1.5A. The design requires constant 3.3V, no more -  no less. 

I am using the functional schematic of the design calculator (sluc624A_UCC28911 - Excel Worksheet) to base my design off of and will be using the 750313739 transformer with Nps = 16.5 and Npa = 4.71.

1) For my design, I wish to always be in Constant Voltage regulation mode (CV). To my understanding, the chip will only enter Constant Current regulation (CC) when the power drawn is greater than the Pmax (Vout * Iout)  defined by the user where Vout is determined using - 

and Iout is found using - 

Are my assumptions about output power correct? If the output current reaches the maximum value (Iout from the listed equation), the chip will operate in CC mode? (Very basic but necessary to understand)

2) I have slight concern given that I am using the 750313739 ( with Npa = 4.71) the device MIGHT enter CC mode based on the equation for Npa from the data sheet-

I don't think I need to worry about Vocc(min) causing the device to enter CC mode before reaching 3.3v?

Any additional comments or recommendations for designing 3.3V(CV) while using the  750313739 transformer would be appreciated. Thank you kindly!!

-Michael

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TLC5947: TLC5947 schematic check

October 21, 2019, 6:01 pm
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Part Number: TLC5947

Dear,


our client want to design TLC5947 and need double confirm as below schematic

(Please visit the site to view this file)

If any concern, Please advise me.

Thanks,

Best regards,

Lawrence.

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Forward PWM Controller solution

October 21, 2019, 6:03 pm
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Is there any Forward PWM Controller with Integrated Auxiliary Bias Supply and SR function solution ?

Best Regards

James

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UCC21750: Minimum ON TIME

October 21, 2019, 6:54 pm
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Part Number: UCC21750

Hi team,

which parameter in our UCC21750 datasheet can be used minimum on time calculation? Thanks.

Application: Buck, Vin=720V , period=15us

Thanks!

Andrew

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TPS62825: Asking for the recommendation TPS62825 design

October 21, 2019, 7:02 pm
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Part Number: TPS62825

Hi Team,

Customer is looking for the detail of TPS62825 design.

 

Could you please check the TPS62825's PSM into PWM mode which Iout loading current thresholds need more than ?, and if this is easy to revison IC's internal circuit to force it always keep working at PWM mode?

 

 

BR,

SHH

 

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BQ25606: BQ25606

October 21, 2019, 7:47 pm
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Part Number: BQ25606

i'd like to know what is  the VSYS  when the battery is absent?  thank you very much.

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LM5117: LM5117 Circuit review

October 21, 2019, 7:53 pm
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Part Number: LM5117

My customer conditions are as follows:

Vin:48~54V

Vo: CC:32V~40V

      CV:32V

Po:600W

Please help the Review circuit  and layout (Please visit the site to view this file)as follows:

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TPS2553: TPS2553 OCP Fault

October 21, 2019, 8:01 pm
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Part Number: TPS2553

Dear Team,

Why the OCP at 3A the device fault signal will assert after 130ms?

But 1.1A will assert immediately

1.1A OCP

3A

BR

Kevin

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