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I have TPS54362 Q1 with VOUT = 5V and 10V. They running in DCM mode but only when VIN is less than 28V, after that it the current jumped more than 10mA (without load).
I checked the datasheet and there nothing mention or explained coming out from DCM to CCM when VIN>28V approx.
How to keep in DCM or pulse skipping mode for all VIN up to 50V?.
Can you check with your eval board to comfirm similar issue here or they keep in DCM mode (low Iq) between 10V to 50V.
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In reply to richard payne:
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In reply to JohnTucker:
Below is the circuit designed for 5V0 modified for 1V8 including R19,R23,R24 and R31, either case they suffer similar problem as described when VRAW>28V the Iq jumped to 10mA due to change of operation mode. NB: The 1V8 load varies from 2mA in sleep mode to 150mA in active mode.
I lost calculation note for R19,R23,R24 for 1V8 but it based on datasheet procedure. There is no WebBench for this device.
I checked this in my lab using TPS54362EVM (standard EVM circuit) and on my EVM also device current increases to 10mA (comes out of LPM mode) when Vin is around 30V.
Please seethe datasheet specification in Page-7 related to this and there is a high voltage threshold for disabling LPM mode.
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