Hi experts,
Can you help to share how to calculate the IC power dissipation in the calculation tool? What's formula are you using? Thanks.
Arie
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Hi experts,
Can you help to share how to calculate the IC power dissipation in the calculation tool? What's formula are you using? Thanks.
Arie
Hi Arie,
The VCC current is effectively the DC current to charge and discharge the FET gates. The current is Icc = Qg*Fsw, where Qg is the gate charge at Vgs = 5V for each FET. The power loss is either Vin*Icc or VCCX*Icc, depending on whether there is an external source tied to VCCX or not.
Connecting to VCCX is advantageous from a power dissipation standpoint, particularly at high Vin or Fsw.
Regards,
Tim