JAJSHM1B July 2008 – June 2019 TPS5450-Q1
PRODUCTION DATA.
The following formulas show how to estimate the device power dissipation under continuous conduction mode operations. They should not be used if the device is working at light loads in the discontinuous conduction mode.
Conduction Loss: Pcon = IOUT2 x RDS(on) x VOUT/VIN
Switching Loss: Psw = VIN x IOUT x 0.01
Quiescent Current Loss: Pq = VIN x 0.01
Total Loss: Ptot = Pcon + Psw + Pq
Given TA => Estimated Junction Temperature: TJ = TA + Rth x Ptot
Given TJMAX = 125°C => Estimated Maximum Ambient Temperature: TAMAX = TJMAX – Rth x Ptot