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Part Number: DRV8353
I am testing my new hardware with DRV8353RS. I supplied it with 20V.
Schematic of DRV8353RS connection:
When I connect 20V to +UBat, i am waiting for 5.3V at output, but there is 0.5V without loading. If i load output to 100 OHM, there is 0V.
The following signals are present at the buck converter pins:
- SW: short 50kHz pulses:
- VIN: DC 20V
- VCC: DC 7V
- BST: some 50kHz pulses with 7V level:
- RCL: DC 0.2V
- RT/SD: DC 2V
- FB: DC 0.2V
- Current consumption ~50mA, DRV8353RS heats up.
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In reply to Adam Sidelsky:
In reply to Vyacheslav Kulakov:
BSR-CCP LV/MV DC/DC Applications
Can you share the schematic of the LM5008?
In reply to David Baba:
I was notified that the LM5008A is integrated in the device in question. I reviewed the schematic and waveform above. One thing that jumps out at me is that the switch node waveforms provided, only show switching to a few volts with 20V in? If so, it suggests one of two things.
Either the input voltage is dropping, or the device is damaged, i.e. high RDSon when switching?
Please check input supply, if present (20V), then I would replace device.
Hope this helps?
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