Please confirm the ESD protection level of TPS51124RGET device (I see other chips have this parameter), and the data sheet does not see the relevant parameters. Thank you!

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TPS65286: 22Vin to 20Vout/3.5A

March 28, 2019, 3:50 am

≫ Next: TPS62147: TPS62147: Duty Cycle Mode

≪ Previous: TPS51124: ESD Protection Level of TPS51124RGET

Part Number:TPS65286

Hi Sir

May I know TPS65286 can support 22Vin to 20Vout / 3.5A or not ?

Thanks

↧

TPS62147: TPS62147: Duty Cycle Mode

March 28, 2019, 4:00 am

≫ Next: LM25145: At the point of EMI, which is better LM25141 or LM25145?

≪ Previous: TPS65286: 22Vin to 20Vout/3.5A

Part Number:TPS62147

Hi Sir:

TPS61247 can work on DCM 100% PWM, But we find some chip work on 96% when i want it work on 100%, the Vout is less than The theoretical value. The Vfb should be 0.7. The chip can't reach 100%, Vfb=0.65V.

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LM25145: At the point of EMI, which is better LM25141 or LM25145?

March 28, 2019, 4:02 am

≫ Next: LM25088: thermal pad connection

≪ Previous: TPS62147: TPS62147: Duty Cycle Mode

Part Number:LM25145

Dear Specialists,

My customer is considering LM25141 and LM25145 and has a question.

I would be grateful if you could advise.

---

At the point of EMI, which is better LM25141 or LM25145?

I can'f find any difference on the datasheet.

---

I appreciate your great help in advance.

Best regards,

Shinichi

↧

LM25088: thermal pad connection

March 28, 2019, 4:23 am

≫ Next: TPS53355: Schematic Review

≪ Previous: LM25145: At the point of EMI, which is better LM25141 or LM25145?

Part Number:LM25088

Hi people,

I am designing an inverting PSU with the LM25088. (+15V In, -12V out) and I was wondering....

1) is the thermal pad internally connected to a pin?

2) what should I do with this pad electrically? Can it be connected to the Ground Plane?

Thanks!

↧

TPS53355: Schematic Review

March 28, 2019, 4:28 am

≫ Next: BQ76940: CAP1 pin connection

≪ Previous: LM25088: thermal pad connection

Part Number:TPS53355

Dear Team,

May I have your double confirm on the schematic?

(Please visit the site to view this file)

Kevin

↧

BQ76940: CAP1 pin connection

March 28, 2019, 4:37 am

≫ Next: LM4040-N: LM4040BIM3-2.5/NOPB Output Voltage Tolerance question

≪ Previous: TPS53355: Schematic Review

Part Number:BQ76940

In my custom board , CAP1 Pin is shorted , i.e. it directly get connected to VSS even when there is no Capacitor attached, so can it affect the Cell Voltages reading , because from that point my cell voltage readings are coming out to be zero

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LM4040-N: LM4040BIM3-2.5/NOPB Output Voltage Tolerance question

March 28, 2019, 5:04 am

≫ Next: HIGH BAY LED DRIVER 120W

≪ Previous: BQ76940: CAP1 pin connection

Part Number:LM4040-N

Hi Ti team,

We test LM4040BIM3-2.5 Output Voltage Tolerance outside 0.2% in Ta=20°C to 23°C, test output Vref is 2.51V or 2.513V

SCH as below,

Could you pls help us check that does IC failed or below SCH design probem or test method problem? thanks!

↧

HIGH BAY LED DRIVER 120W

March 28, 2019, 5:06 am

≫ Next: TPS65217: AC voltage detection threshold too high?

≪ Previous: LM4040-N: LM4040BIM3-2.5/NOPB Output Voltage Tolerance question

Hello,

I would desing a AC/DC CC led driver and I found PMP4317.1 in the Reference Desing that could fit the application but I would modifiy di max output current up to 1000mA.

Another better solution would be to make a 480/500W led driver with 4 different control channal with a max CC of 1000mA with indipendent analog and pwm dimming each.

Could you please help me in this task and give some suggestion?

Thanks in advanced,
Luca.

↧

TPS65217: AC voltage detection threshold too high?

March 28, 2019, 5:08 am

≫ Next: concept understanding: Inrush current limit circuit working

≪ Previous: HIGH BAY LED DRIVER 120W

Part Number:TPS65217

In the datasheet of the TPS65217, the voltage detection threshold for VAC and VUSB is described as minimal 4.3 Volt.

I would assume this means that the power path would switch on at 4.3 Volt latest (could be lower).

If that is not the case, it is weird in my opinion that no upper bound is given.

In my tests, the device switches on at 4.3667 volt.

Since this is higher than the 4.3 volt given in the datasheet, I'm wondering whether my design is wrong.

Can you tell me whether I should review my design or whether this is according to the specification, and whether the datasheet should contain an upper bound as well?

Thank you for your time.

↧

concept understanding: Inrush current limit circuit working

March 28, 2019, 5:29 am

≫ Next: LM5170-Q1: LM5170-Q1 - Current Sharing

≪ Previous: TPS65217: AC voltage detection threshold too high?

Hi Everyone!

I recently come to visit this active inrush current limit circuit but curious how it is working . Please feed me some info regarding the working .

Ref image added here:

is there any application notes available for this setup, i have searched but i couldnt found nearby sch itself. Suggestion and inputs are welcome.

↧

LM5170-Q1: LM5170-Q1 - Current Sharing

March 28, 2019, 6:57 am

≫ Next: BQ24172: Minimum current

≪ Previous: concept understanding: Inrush current limit circuit working

Part Number:LM5170-Q1

Hello.

I am using the LM5170 to control a 4-phase buck converter. The buck is 48V/36V 1 kW. The controller is regulating the output voltage and it is able to handle transients, but I am having issues currently with current sharing among the four phases. My phase 1 and 2 share one controller and my phase 3 and 4 share another controller. Current is balance between phases 1 and 2 and current is balanced between phases 3 and 4, but the current balance is not balanced between the controllers. Phases 1 and 2 have way more current in them than phases 3 and 4.

I am using 1 voltage loop to set the ISETA pin for all four phases. I was wondering if I should be using 2 separate voltage loops, one for each controller? I do not know if the references are slightly off in the controller and if it is causing a large discrepancy between both controllers.

↧

BQ24172: Minimum current

March 28, 2019, 7:18 am

≫ Next: BQ24105: Minimum current

≪ Previous: LM5170-Q1: LM5170-Q1 - Current Sharing

Part Number:BQ24172

Hi,

What is the minimum current of BQ24172?

(I need a minimum current of 80mA).

From the graphs in the datasheet it seems that the current is 0.5A.

However, i am sure that the current may be lower (of course the efficiency would be low...)

If i cant get 80mA, please advice a switching (not linear) battery charger for such currents.

Best Regards,

Arkadi

↧

BQ24105: Minimum current

March 28, 2019, 7:19 am

≫ Next: BQ78350-R1: Battery discharge FET turns off during shortcut even if ASCD protection is disabled

≪ Previous: BQ24172: Minimum current

Part Number:BQ24105

Hi,

What is the minimum current of BQ24105?

(I need a minimum current of 80mA).

From the graphs in the datasheet it seems that the current is 0.5A.

However, i am sure that the current may be lower (of course the efficiency would be low...)

If i cant get 80mA, please advice a switching (not linear) battery charger for such currents.

Best Regards,

Arkadi

↧

BQ78350-R1: Battery discharge FET turns off during shortcut even if ASCD protection is disabled

March 28, 2019, 7:42 am

≫ Next: TPS92662-Q1: Connection of mutliple LEDs per channel?

≪ Previous: BQ24105: Minimum current

Part Number:BQ78350-R1

Hello

Ive got a problem with my bq78350-r1 design. Battery managed with Bq78350-r1 and bq769200 powering BLDC engine controller. During engine rotation direction change, controller sometimes kills the battery (DSG FET turns off). If the ASDC protection is enabled, in lifetimes data i can see that it was a Short Circuit and it is reasonable for me. But if i disable shortcircuit protection IC turns off DSG FET too (i checked FET's gate and it is pulled down) for about one or two seconds and then back to normal. In lifetime data there is no sign of any protection activation. What couses DSG FET to turn off? How to disable this?

↧

TPS92662-Q1: Connection of mutliple LEDs per channel?

March 28, 2019, 7:43 am

≫ Next: TPS54240: TPS54240 damage

≪ Previous: BQ78350-R1: Battery discharge FET turns off during shortcut even if ASCD protection is disabled

Part Number:TPS92662-Q1

Hi team,

For TPS92662-Q1, is it possible to connect mutliple LEDs per channel?

If so, how many LEDs can be connected per channel?

Thanks,

Sam Lee

↧

TPS54240: TPS54240 damage

March 28, 2019, 7:43 am

≫ Next: BQ28Z610: Overtemperature condition does not trip the related FET in both charge & discharge.

≪ Previous: TPS92662-Q1: Connection of mutliple LEDs per channel?

Part Number:TPS54240

1.In each of the following cases, the IC2 is damaged;about 5% percent；VIN:9V, Vout:=15v/-15V,100mA

a. when the power was turned on(Test no load or with load all have damaged);Use a multimeter to test: there is no difference between damaged IC pins and normal IC;

b. when the power is turn on,VIN=9V,Iout=100mA, after a later,The tps54240 is about 4-5% percent of the damage occurred,I test with a multimeter,pin2 and pin11 is short;

c. when I test Short circuit protection,,-15V output Short circuit protection is OK,but the +15V output Short circuit protection is not OK,and +15V output Short will damaged IC2,Use a multimeter to test: there is no difference between damaged IC pins and normal IC? why +15V output No short circuit protection?

d. PIN10 TO -15V waveform as below; and VIN TO -15V waveform is not have any spikes;

2. I find the datasheet in 7.3.14, when the Frequency rising,the VIN is voltage falling,so I use the WEBENCH® Designer ,the result Switching frequency<700K,then I use 600K frequency,and test the result is about 4% percent of the damage occurred,I test with a multimeter,pin2 and pin11 is not short,but the IC can not work!