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RE: DRV595: Increasing power capability

March 15, 2017, 3:32 am
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Hi Anders,
7.5A over-current protect threshold is for an instantaneous signal. When the output current exceeds the threshold, OC FAULT is triggered. But 4A maximum output is more for thermal consideration. When outputting a large current continously, the temperature could go high, and OT FAULT is triggered when the temperature exceeds the threshold. So we use a 4A maximum output current in the datasheet, but actually it's only a rough number. If the thermal design in the system is good enough, the maximum output current can be more than 4A.

Best regards,
Shawn Zheng
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RE: DRV595: Increasing power capability

March 15, 2017, 4:33 am
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Based on the thermal resistance JA 22 deg/W, 85 degC environment and the thermal trip point 150 degC I get a dissipation of 2.95W in the device.
Assuming your rough 4A is valid I then get a rdson of 186mOhms.
From the typical curves in the datasheet we have rdson vs ambient temperature.( In this case the 60mohms at 25 degC as stated also in the electrical characteristics table).
Now if I compare the rdson there is a significant difference at 150 degC.
Chip temperature is not the same as ambient temperature which clutter the conclusions.
Should I interpretate that at Tambient 150degC for the Rdson the chip temperature is at Tj=215degC.
There is an inconcistency somewhere either in my resoning or in the datasheet.
Could you please advice?
How much power can be dissipated in the device?
Is it the chip temperature that is shown in the typical Rdson curves?
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RE: DRV8830: VIH for I2C line

March 15, 2017, 5:43 am
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Hello Rick-san,

Thank you for your prompt reply. Looking at the electrical specification, VIH_MAX is 0.5 x VCC. So when VCC=6.0V, VIH_MAX = 3.0V.
If 3.3V is acceptable, what is the meaning of "VIH_MAX" specification ?

Best Regards,
Kawai
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RE: No Communication

March 15, 2017, 6:05 am
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It's not able to communicate since it doesn't see the 24VDC that I am applying. There's communication from my laptop to the full speed USB isolator to the to the USB2ANY. There just seems to be a problem with the USB2ANY. It's possible that it's not functioning properly.

Hopefully the new USB2ANY, that's on it's way, will arrive today and be the answer.

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No Communication

March 14, 2017, 12:10 pm
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When starting the DRV10983 EVM control software, I get the message "An update to the device is required. Please make sure that the power supply is greater than 22V and press OK." 

I made sure that the it is greater than 22V (it's actually 24V). I made sure that this was so. My laptop is connected to the USB2ANY and it's light is on indicating such. I can only get the software to come up if I say to continue in simulation mode then continue. Subsequently, it is put into DEMO mode. 

I did make sure that I saw 24V where everywhere I'm supposed to.

This software has always been buggy (both versions). Currently using v3.0.5

Need help ASAP.

L.Keel

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RE: DRV8830: VIH for I2C line

March 15, 2017, 6:13 am
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Hi Kawai-san,

There has been some confusion about this spec. The voltage on the inputs can be up to the maximum ratings.

The spec is intended to provide two pieces of information.

1) The device typically switches points from high to low and low to high at the typical values. This also shows some hysteresis.

2) The min Vil and max Vih show the values that the device will recognized a logic low (<= Vil min) and a logic high (>=Vih max). To make certain a logic high is accepted, the input voltage must be >= Vih max. To make certain a logic low is accepted, the input voltage must be <= Vil min. Between these values, the device may not have transitioned.

Think of the Vil spec as "Input logic-low voltage falling threshold" and the Vih spec as ""Input logic-high voltage rising threshold"
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RE: DRV8871: Speed Regulation

March 15, 2017, 6:20 am
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Hi Amanda,

Can you clarify a few items?

What additional control over the speed does the customer want?

What is meant by drive the motor faster?

By integrated current sensing, are you referring to the VPROPI pin of the DRV8801?

Is there a link to the motor?
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DRV8871: Speed Regulation

March 14, 2017, 7:55 pm
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Part Number: DRV8871

Hello there,

I have a customer who is currently using the DRV8801 device to drive his brushed DC motor but he wants more control over the speed and to be able to drive faster. I'm trying to understand if there are existing capabilities within his device that are maybe untapped for which he'd be able to kick his RPMs up a notch (while still maintaining a fast decay) or if maybe I should be recommending the DRV8871 since it seems to be the poster-child device for variable speed control. Please help me understand the direction I should take or if there's something I'm missing. 

Also he wants to maintain the integrated current sensing capabilities so that is also a factor. 

Motor being used: Uniqualis 180SH-12230V

Thanks so much for your feedback,

-Amanda

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RE: DRV8312: DRV8312 about the coil voltage control

March 15, 2017, 6:33 am
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Hello Mickey,
The DRV8312 is a three phase driver and not an automotive rated part. If customer is interested in only one output channel, I would recommend looking at a single output automotive rated device, the DRV8872-Q1 has PWM control. What are customer's specs? we might be limited by their requirements. Thank you.
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DRV8312: DRV8312 about the coil voltage control

March 15, 2017, 12:23 am
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Part Number: DRV8312

Hi Team,

The customer would like to use DRV8312.   The customer would like to use one output channel of DRV8312 device to control the coil voltage through PWM

The customer's application is the Automotive Magnetorheological Semi - active Suspension System. He needs to control the coil current in the magnetorheological

damper to control the strength of the magnetic field. 

Can DRV8312 be used to control the coil voltage? If DRV8312 cannot be  used to control the coil voltage, would you recommend a suitable IC or a good 

solution?

Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments

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RE: UC2625 Gate Driver

March 15, 2017, 6:34 am
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Hi Eray,

For gate drivers, have you looked at the LM5107? You may need additional circuitry to invert the signal.

Also, have you investigated using the DRV8307 or DRV8308? Depending on the voltage range this may meet your needs.
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RE: UC2625 Gate Driver

March 15, 2017, 6:39 am
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Hello Eray,

Our experts have been notified and should reply soon.
Thank you
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RE: DRV8701: DRV8701 Operation out of Spec Voltage

March 15, 2017, 7:07 am
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Hello Mathew,

We look investigate and reply to you soon.
Thank you.
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DRV8701: DRV8701 Operation out of Spec Voltage

March 15, 2017, 6:56 am
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Part Number: DRV8701

Hello,

I was curious about using this chip to run a 90V DC motor even though it's max voltage is 47V.  Would I be able to set the ground voltage for the chip to about 70-80VDC and run the motor (given that VM is @ 110VDC)?  I'm under the assumption if I were to do this that the Rsense (and other features) wouldn't work properly, is this a correct assumption?

Thank you,

Mat

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RE: Selection of MOSFET driver for switched reluctance motor with system voltages 48V and current 3A

March 15, 2017, 7:14 am
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Hi Pragash,

The DRV8844 probably cannot be used. It is rated below 3A.

The DRV8432 may work, but this depends on the control. Each output pair has a RESET signal. If the FET can be used instead of the diode, it may work.
The DRV8432 has a bootstrap architecture. A small low pulse is recommended to recharge the bootstrap capacitor.
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p channel and n channel Mosfet + driver

March 15, 2017, 7:45 am
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Hi,

I am exploring the products for asymmetric bridge circuit for Switched reluctance motor control. I want to know about the products related to p channel n channel dual MOSFETs rated at 60 V and 5 A current. Also is there availability of integrated driver for the above module. Also can be the p channel and n channel Mosfets of the same IC be connected in seriec with load winding? Gate voltage supply range 15V

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RE: UC2625 Gate Driver

March 15, 2017, 7:52 am
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Hello Rick,

Thanks for your reply. I use UC2625 since it is a Controlled Assembly / Enhanced Product.

So, if I use a LM5100 series gate driver, I should invert (only) PU outputs using an N type Mosfet. Did I get it right?

Regards..
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RE: UC2625 Gate Driver

March 15, 2017, 7:53 am
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Thanks Luis. By the way, are there any evaluation boards or example schematics for UC2625 ?
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RE: UC2625 Gate Driver

March 15, 2017, 8:01 am
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Hi Eray,

A device expert has been contacted to confirm this, plus provide any information regarding EVMs or example schematics.
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UC2625 Gate Driver

March 15, 2017, 12:11 am
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Hi,

I am trying to use UC2625 in a design. Planning to drive N-channel MOSFETs on high and low-sides.

UC2625 PU outputs are in open-drain configuration, PD outputs are something like push-pull or totem-pole. (PU active low, PD active high)

Are there any gate drivers, to accept these two inputs? Or what kind of gate driver should I implement?

Thanks!

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