DRV8871 startup
Hello,Our customer now trying to use DRV8871, but their startup current is too big(about 5A/1us) and the device could not operate correctly.It seems that it due to current regulation (not OCP), so they...
View ArticleRE: GND and GVDD_C connection on DRV8332
Hi Rick, thank you very much for your answers and the links. They are very useful. What kind of thermal grease should be used between the driver and its heat sink? Something electrically conducting, I...
View ArticleRE: GND and GVDD_C connection on DRV8332
Hi Michael, Please see section 11.3 of the datasheet for two recommendations.
View ArticleGND and GVDD_C connection on DRV8332
Hello,please answer the following questions:1. What is the best place to connect the GND and GND_X grounds?2. It is recommended to connect the heat sink attached to the DRV8332 to GND. Can you give a...
View ArticleRE: GND and GVDD_C connection on DRV8332
Hi Rick, I have read section 10.3 of the DRV8432 datasheet. The suggested thermal compound is Ceramique from Arctic Silver. But this compound is insulating. Therefore, the chip's thermal pad will not...
View ArticleRE: GND and GVDD_C connection on DRV8332
Hi Michael, You are correct; the thermal pad will not be grounded with insulating thermal compound. The thermal slug does not need external grounding, but we consider it good practice to connect the...
View ArticleRE: GND and GVDD_C connection on DRV8332
Hi Rick, thank you very much for the detailed answer. Best regards, Michael
View ArticleRE: GND and GVDD_C connection on DRV8332
Rick, I didn't realize it at once, but now another question arises: If the thermal slug is conductively attached to the substrate of the die, and the thermal compound does not completely insulate the...
View ArticleRE: GND and GVDD_C connection on DRV8332
Hi Michael, If the heatsink is grounded, there is no problem. This is similar to the DRV8312 thermal pad, which relies on the ground plane to dissipate the heat.
View ArticleRE: GND and GVDD_C connection on DRV8332
OK, thank you very much. Best regards, Michael
View ArticleRE: DRV8303 gate output problems
Hi Osman, It does appear that a fault is shutting down the FETs in Figure 1, but there is more information to confirm it really is. Can you also capture the SH_A pin, so the high side gate to source...
View ArticleRE: DRV8303 gate output problems
Hi Osman, Another question: When the fault occurred, did you read the status register to determine the fault?
View ArticleRE: DRV8303 gate output problems
Mr. Duncan,Thank you for your response. I'll gladly do this tomorrow morning when I get back to the setup. Is there anything else you would like to see?FYI, I've tried omitting the pull-down resistors...
View ArticleRE: DRV8303 gate output problems
[quote user="Rick Duncan"]When the fault occurred, did you read the status register to determine the fault?[/quote] I have not. I was under the impression that the fault resets since the fault pin went...
View ArticleRE: DRV8303 gate output problems
Hi Osman, If you get a chance, please look at the GVDD, AVDD, DVDD, and PVDD when the fault occurs. As you mentioned, it appears there is no ceramic cap near the DRV8303. This could cause PVDD to...
View ArticleRE: DRV8303 gate output problems
Mr. Duncan, I'll make sure to also capture GVDD, AVDD, DVDD and PVDD along with the nFault pin. Do you have a recommendation for the size of the ceramic capacitor on PVDD? I do have a 470uF...
View ArticleRE: DRV8303 gate output problems
Hi Osman, Please refer to Table 3 of the datasheet for capacitor recommendations. Using the power supply current reading or a DMM in-line provides average current. Ideally the current probe shows what...
View ArticleRE: Ringing on output of DRV8432
Hi, I am using DRV8432 in Parallel full bridge mode. I am getting a lot of ringing on the output at the inductors. Please share the snubber circuit which you have designed for DRV8432 and the location...
View ArticlePWM Polarity Inverting Circuit for TEC module using DRV8432 in parallel full...
Hello, I am working on a PWM polarity inverting circuit for TEC module with 24V power supply, 1 TEC requires 12A driving current in total. so I am using DRV8432 in Parallel full bridge mode with my...
View ArticleRE: PWM Polarity Inverting Circuit for TEC module using DRV8432 in parallel...
Hi, The FAULT and OTW signals are indicating the DRV8432 has detected a problem of some sort. It indicates overtemperature plus either overcurrent or undervoltage. Have you examined the VDD and GVDDx...
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