1. TPS54620 Current Limit
J. Tucker
5 June, 2018

2. 12 V input, 5 V @ 6A Output PH Vout Vin = 12 V VPH less than Vin
VPH decreases during ON time (sourcing current) PH
Vout
Body diode conduction during dead time

3. 12 V input, 5 V @ 10A Output PH Vout Vin = 12 V
Peak current limit reached here PH
Vout
Body diode conduction during dead time
Vout decreases above current limit
Duty cycle decreases as load current increase (peak current limit reduces on time)

4. 12 V input, 5 V @ 11A Output PH Vout Vin = 12 V
Peak current limit reached earlier in the cycle PH
Vout
Body diode conduction during dead time
Vout decreases further as current increases
Duty cycle decreases further