Other Parts Discussed in Thread: TPS54318
Hi
The customer wants to estimate the power consumption of this device. As mentioned in other device data sheets (eg TPS54318), it can be calculated using the following formula:
1. Conduction loss: Pcon = Iout ^ 2 * Rds * Vout / Vin
2. Switching loss: Psw = 2 (tr + tf) * Vin ^ 2 * Iout * Fsw
3. Gate charge loss: Pg = 2 * Qg * Vin * Fsw
4. Quiescent current loss: Pq = Iq * Vin
5. Dead time loss: Pd = 2 * 0.7V * Fsw * Iout
If this process is correct, what are the following parameters?
How much is tr and tf?
How much is Qg?
Regards,
Koji Hamamoto
