Tool/software:
Based on Fault table 6, 8353 can be programmed to detect over current using both VDS and Vsense simultaneously but different paths in internal circuitry. Figure 48 shows VDS configuration using Rsense external power resistor use case. High side VDS is set to detect voltage across high side external FET which this diff voltage is compared to VDS_OCP threshold which is same for both hi and Lo sode fets. See both figures below.
1. However Vsense overcurrent detection schematic showing measurement and threshold comparator for Vsense_ocp threshold is not shown in the specs like VDS overcurrent options are shown. Can you help with this please.
2. If I want to use VDS detection for low side with external Rsense, then given VDS_ocp same for high and low fets, for an fixed value of over current I need to set CSA_FET =0 and LS_REF =0 so minus input of low side VDS monitor is tied to SPx other wise high and low sides will measure different resistors (low side fet R plus Rsense where high side only fet R). Is this correct.
3. Given, I program CSA_FET and LS_REF both to 0, does this anyway effect which signal Vsense is monitoring; I expect Vsense and VDS are independent. Please let me know.
4. Given both VDS and Vsense overcurrent are tied to same OCP_MODE setting, is there a way to disable one and use the other such as use Vsense only with VDS disabled?
Regrads
TG
