Part Number:DRV595
Hello,
I am using DRV595 to drive a TEC (+/-4V, 3A MAX).
First, the driver was configured to be in 20dB, SLV mode. The SYNC input was 1Mhz. Also, FS0,1,2 were set to [1 1 0], 1Mhz.
When I enabled the chip with 0 differential input, the chip got really hot consuming 5W without any load attached. I measured output (+/-) signals and there were unsynchronized 4.3Mhz signals out from output pins (drive side of inductors).
Then, I changed the mode configuration so that the chip could be in the 20dB/Master mode and disconnected the SYNC input (floating). (No changes in FS 0,1,2 configuration, still in 1Mhz config).
The output signals were 1Mhz which I expected, BUT the SYNC signal (now its an output) was 100kHz! Ah-ha!
I switched it back to the 20dB/SLV mode and NOW with 100kHz SYNC input! Then, the output signal was 1Mhz and there was no excessive power consumption.
Based on these experiments, It seems there is a factor of 10 in between the SYNC and output signals.
Now, I have two questions.
1. I couldn't find any mention of this factor of 10 between SYNC and output signals in the datasheet. Is this expected feature? or is this something that we can set with FS pins?
2. In SLV mode, do FS pins need to be set correctly? meaning that does it need to be matched with input SYNC?
Thanks,
Sukwon