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TPS543B20: About Bootstrap resistor value

Part Number: TPS543B20

Hi,

Could you tell me about TPS543B20 Bootstrap resistor value?
Customers are trying to install a Bootstrap resistor to reduce spike noise.

Customer use condition is :
Vin=10V
Vout=0.72V
Iout=10A~20A
Fsw≒870kHz

Customers are trying to use 3.3 ohm resistor.
Is this all right?
And Please tell me the upper limit of the resistor value which becomes a problem.




Best Regards,
Yusuke