Hello,
My customer has been using TPS40140 and has a timing problem with this devices. Here are a couple of questions related to TPS40140 to be clarify. Customer uses it in two phase mode.
1. VREG should be shut off when UVLO_CEx is pulled low, is this right?
2. What is the delay between VREG build-up and SS ramp-up? Is it a fixed time or a variable?
3. Customer found the between VREG ramp-up and Soft-start ramp-up varies when TPS40140 is enabled before VREG drops to zero. Could anyone help explain why?
Thanks!