MPM54322 Power ON Delay - not functioning query

Integrated Inductor Power Modules
1

Experimenting on a EVM54322. Would like to delay Buck 2 output until after Buck 1 is up.

I am having difficulty in getting any Buck 2 Power On Delay.
With the extreme values set below, we get no delay as shown in the scope cap.

MPM54322 Buck 2 Delay Settings
MPM54322 Buck 2 Delay Settings2000×797 180 KB

MPM54322 Buck 1 vs Buck 2 Output on EN
MPM54322 Buck 1 vs Buck 2 Output on EN1024×600 65.7 KB

We are using EVKT-USBI2C-02 and Virtual Bench Pro 4.0 v4.0.66.2007.

I have saved to Mode 0 region and verified the correct values are in the MTP region after power cycle from the GUI and individual reg read. The same ‘no delay’ waveform is seen at power-on and EN disable/enable. I have tried various other values of clock and Power On Delay with the same results.

Any suggestion where we are going wrong please?

Best wishes

2

Hi,

I think the blue curve is the Vout1 and the yellow curve is Vout2. There is a delay between these two outputs. You can zoom in the window to see the delay.

Best,

Fox

3

Hi Fox, Thanks for the reply. With the clock frequency set to 100Hz, the cycle time I’m expecting is 10ms. With a Power On Delay set to 1024, I’d be expecting a delay of around 10 seconds. Is that a correct interpretation of the Power On Delay function?

CH1 (Yellow) = Buck 1. CH2 (Blue) = Buck2. The scope cap above shows any delay is in the order of microseconds.