Other Parts Discussed in Thread: TPS62147
Hi,
We are planning to use TPS62150 in our design with below specifications.
Input Voltage - 10.5-13.5V
Output Voltage - 3.3V
Output Current - 0.1-0.4A
Based on datasheet recommendation, we have selected 2.5MHz switching frequency and 2.2µH inductor.
Considering 20% tolerance of inductor, maximum input voltage of 13.5V and output voltage of 3.3V, inductor ripple current is calculated using vout / vin x (vinmax-vout) / fsw / L formula as 0.57A.
Can you please confirm if above ripple current calculation is correct?
In general, we like to keep inductor current within 30% of maximum load current and operate in continuous current mode. However, in this case, ripple current is higher than the maximum load current and hence, a reverse current may flow in the design and/or device may go in dis-continuous mode. Can you please share your comments on this?
Also, is there any alternate part that can be used with above input/output requirements while keeping inductor ripple current below 30% of load current and operating in continuous current mode?
Regards
Raja
