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TPS50601-SP: Current Limit

Part Number: TPS50601-SP
Other Parts Discussed in Thread: TPS50601A-SP

Could you explain the meaning of the three current limits shown in the Datasheet, see image below?

1. Why does the low-side NMOS switch show two different limits,  3A for sinking and 10A for sourcing.  Its the same device, what does it care if current is going in or out, why are there two limits for this.

2. Can you give me an example of when the device is sinking current and how the 3A would apply and another example for sourcing?

3. The high-side is a PMOS.  If this device can have 100% duty cycle means that the high-side is always on.  Does this mean I can pass 10A continious without burning the device?  Does this predicate on having a massive heatsink?  

4. The front sheet of the D/S incates a max of 6A on the IC.  Is this a 6A continous operation?

5. Under what heatsink conditions can I pass 6A on the IC? Can it do 6A without a heatsink?