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INA4181-Q1: Regarding High-Side Current Sensing for Negative voltages

October 3, 2018, 6:18 pm
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Part Number:INA4181-Q1

Hi,

We are looking for dual or quad channel high-side current sensing amplifier with either analog or SPI/I2C output.

We would like to sense the currents for the following voltages:

+9V
-9V
+4.25V
-4.25V

Current Sense Range: 0 to 1.5A

Please suggest a suitable amplifier for the above mentioned requirements.

We checked on the following IC on the TI website:

1. INA4181-Q1 (4 – Channel Current Amplifier with analog outputs) - www.ti.com/.../ina4181-q1.pdf

As per the datasheet of this amplifier, this amplifier can accept voltage from -0.2V to 26V on IN+ and IN- pins in common mode.

As per our understanding, this amplifier can be used to sense current for +9V and +4.25V. Please let us know if these devices can be used to sense current for -9V and -4.25V?

If not then please suggest similar devices to INA4181-Q1 that can be used to sense the current for the below mentioned voltages:

+9V
-9V
+4.25V
-4.25V

Current Sense Range: 0 to 1.5A

Thanks & Regards,
Sunny Watts

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THS4551: Minimum Input Frequency

October 3, 2018, 8:18 pm
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Part Number:THS4551

Hi Team,

 The input frequency for the customer application is 0.1 to 3KHz, the circuit configuration is a 10 times gain amplifier.
 The Fig.68 Differential Open-Loop Output Impedance in datasheet shows that the impedance at low frequency is high impedance.

 The customer's application uses TH4551 at Closed-Loop,  Closed-Loop Output Impedance will be small. is it possible to use TH4551 at the customer application? 

Regards,
Ogasawra

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LM7171: Unipolar Supply VCC

October 4, 2018, 12:09 am
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Part Number:LM7171

Is this LM7171 able to use unipolar supply VCC (V- pin is connected to ground)?

Regards,

Brian

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INA149: INA149 Impedance

October 4, 2018, 3:27 am
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TLC075: Peak to Peak output voltage vs frequency

October 4, 2018, 4:43 am
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Part Number:TLC075

Hi,

I have a question related to Peak to Peak output voltage vs frequency in the TLC75 datasheet :

In this curve, how is guaranted the THD+N <= 5%? Is it only on the flat region of the curve?

Could anyone tell me what circuit is used for this test (amplifier with a gain of 10 or more?).

Thanks

Matthieu

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LM2903: On the part is also has 86M does this mean the date code is 1823 Please advise

October 4, 2018, 5:36 am
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Part Number:LM2903

I have a part the I am trying to get the date code for it.   It has 86M   Does this mean the date code is 1823.   And do you have a info on how I can decode the date codes.

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LM393: Is there a dual supply comparator that also has a ground pin to interface with digital logic?

October 4, 2018, 6:13 am
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Part Number:LM393

I have a number of bipolar (+/- 3.5V) signals that need to be individually compared to a programmable threshold to drive a LVTTL digital input (ISO7741 isolator).

A thorough search shows me that a programmable threshold comparator (voltage output DAC +  comparator) is not something that exists.  As such, I am now looking for a comparator with bipolar inputs, an output that will be compatible with LVTTL, and will run off of my +/- 5V rails.  So far, I haven't found anything by any manufacturer since all parts that are close don't have a ground pin for the output.  I could add a second comparator and a transistor or a couple of transistors to the output, but I'd rather create a smaller solution if one exists.  Thoughts?

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LM324LV: Opamp output at VCC removed condition

October 4, 2018, 6:45 am
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Part Number:LM324LV

Hi,
   What would be the output voltage level when VCC removed from the LM324LV in Voltage follower mode.

Conditions:-
    Non-inverting pin input voltage - 0.8V and VCC 0V (OFF).

Jebin

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ONET8551T: Cleaning ONET8551T prior to Packaging

October 4, 2018, 10:04 am
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Part Number:ONET8551T

Hello,

Prior to packaging, would would like to clean the ONET8551 with IPA and acetone. Are both of these safe to use on the ONET8551?

Thank you,

Nathan

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INA301: Question of INA301's Analog Vout Delay Time And Phase-Shift Specifications

October 4, 2018, 6:54 pm
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Part Number:INA301

Hi Sirs,

Do we have INA301 analog Vout's delay time or phase-shift specifications similar to the example chart below? 



Thank you and Best regards,

Wayne Chen
10/05/2018

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INA200: On the behavior of the comparator of INA200

October 4, 2018, 9:28 pm
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Part Number:INA200

Hi, team.

I posted the following thread.

e2e.ti.com/.../732488

Let me confirm CMPout behavior on INA200.

＜Quesiton＞

While Vin keeps Low (<0.6V), does CMPout keep Low even if RESET repeat High and Low?

On my customer’s verification, CMPout repeats high and Low linked with RESET.

Which is the correct behavior?

Customer's verification

Best regards,

Masumi Sekiguchi

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TL082: TL082 is not working fine as subtractor

October 5, 2018, 12:07 am
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Part Number:TL082

WHY IS THIS OPAMP(TL082) NOT WORKING AS SUBTRACTOR (UNDER LOW DIFFERENTIAL INPUT   & GAIN=1)? Application diagram is same as the diagram in the link. In the circuit, V2 range is 12Volt to 14Volt, V1 is 12Volt  and R1=R2=Rf.     And suggest an opamp that works in low differential input voltage. Thanks

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OPA355-Q1: How to coodinate phase margin of high speed amplifier

October 5, 2018, 3:38 am
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Part Number:OPA355-Q1

Dear all,

My customer concern oscillation of this high speed amplifier with high load capacitance(around 1nF).

Could you teach us the appropriate way to coodinate phase margin?

Simulation by TINA-TI? Test by FRA? or Test by oscilloscope with changing capacitance load and resistor?

We think that high speed amplifier can oscillate easier than general purpose amplifiers.

So, we would like to know the right way to coodinate phase margin.

Best regards,

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INA212-Q1: how to protect MCU pin connected with OUT pin

October 5, 2018, 3:55 am
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Part Number:INA212-Q1

Dear all,

We concern the situation when IN- pin and OUT pin is shorted.

We connect IN- pin to 12V and OUT pin to 5V MCU.

So, if they are shorted, MCU I/O pin will be broken by 12V.

Could you teach us the countermeasures to protect MCU pin?

Best regards,

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LMP8358: Differential input ?

October 5, 2018, 4:08 am
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Part Number:LMP8358

Why is the LMP8358 limited to 100mV differential input? I would like to use it to 150mV or even 200mV. I see the absoulute max input is limited to the rails. I am suppling the INAMP with 5V and -0.3V.  I'm using it to sense current loside (0 to 200mV ) above circuit ground.

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LMH6554: Frequency response for different input capacitances

October 5, 2018, 5:09 am
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Part Number:LMH6554

I'm using the LMH6554 as a transimpedance amplifier. The input current source has a capacitance C_IN in parallel. With this setup a PSPICE AC analysis results in the following bandwidths:

C_IN = 1 pF  => BW = 49 MHz

C_IN = 50 pF  => BW = 63 MHz

Usually transimpedance amplifier bandwidth decreases with increasing capacitances at input. What is the reason for this behaviour?

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TSM104W: LM614 alternative

October 5, 2018, 6:16 am
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Part Number:TSM104W

Hello dear Amps Team, 

Since the LM614 is EOL, I am searching for an alternative. I was recommended the TSM104W as such, however, I am not sure, if it is fully compatible. And if not, what are the main differences and what would be the better alternative? And which packages are available for the TSM104W, I would need the SO16W, or the SO16L. 

Best regards, 

Catarina

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INA230: Power sequence Analog inputs between and Vs

October 5, 2018, 6:33 am
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Part Number:INA230

Hi all

Would you mind if we ask INA230?

<Question1>
Is there power sequence Analog inputs between and Vs?

<Question2>
On the datasheet, there are descriptions of absolute maximum ratings;
SDA : GND – 0.3 to +6
SCL : GND – 0.3 to VS + 0.3
Does it mean SCL has diode between SCL and VS?
SDA doesn't have diode between SDA and VS, right?

Kind regards,

Hirotaka Matsumoto

GND – 0.3 to VS + 0.3

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ISO224: Transfer function

October 5, 2018, 9:57 am
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Part Number:ISO224

Hi team,

For the ISO224 transfer function is shown in the datasheet figure. 5.

That's Vout diff= Vin/3 but may I know some voltage value for VOUTP and VOUTN when such as Vout diff= 2V and 4V in figure 5?

Thank you!

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INA302: eFuse Application Causes Damage to Current Sense Amp

October 5, 2018, 10:42 am
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Part Number:INA302

Hi there,

I'm working on a current sensing application using the INA302A1 for electronic fusing in a robot power supply. Basically I'd like to set current threshold limits for a "slow blow" and "fast blow" fuse using the ALERT2 and ALERT1 outputs respectively. Both pins are tied together in a wired OR configuration with a shared pull-up resistor for an active low FLT signal which is then fed into control logic for a power MOSFET.

I tested the INA302 chip using the EVM and it seemed like it should work great for this application. After assembling my own prototype board, however, I'm running into some issues. I seem to have burnt up a few INA302 chips and I'm not sure why. My common mode voltage is 24V and my shunt resistor is 10mOhm. As I adjust the current through the shunt resistor with a variable load I eventually end up with a short between 24V and GND. This is with currents <1A, so I don't think that I'm exceeding the maximum differential input voltage. I've checked the rest of my board and it's definitely related to the INA302. I've read the datasheet carefully and I followed the suggested board layout closely so I'm confused as to why I keep blowing up chips. About the only change that I made was connecting the two ALERT signals together in a wired OR configuration, but since they are open-collector outputs I didn't think that would cause a problem. My analog design skills are a bit rusty, so I would appreciate any insight you all might have.

Here's a portion of the schematic:

Thanks,

Domenic Rodriguez

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