Due to we want to common old design and we don't change component (New design difference only output current, we reduce to 38mA)
After we re-calculate, we found output inductance should more than 314uH (follow equation 1, on page 12 of LMR16006 datasheet). but we want to use 47uH (common old design).
please you check us that we can use this value with condition below? What will it affect with?
we try to calculate ESR of capacitor (follow Equation 8,page 13 of LMR16006 datasheet), we get 0.6 Ohm and we use 0.03 Ohm.
Our condition
Input voltage: 48 V (45.6 to 50.4V)
Output voltage: 3.6V
Maximum output current: 0.038A
Switching Frequency: 700kHz
Component selection
output inductance: 47uH (tolerance 10%)
output capacitance: 10uF/6.3V (ESR 0.03 Ohm at 700kHz)
Calculation
Ripple current: 0.112 A (follow equation 2, on page 12 of LMR16006 datasheet)
Output capacitor: 1.5uF (follow equation 5, on page 13 of LMR16006 datasheet)
Output capacitor: 0.26uF (follow equation 6, on page 13 of LMR16006 datasheet)
Output capacitor: 0.28uF (follow equation 7, on page 13 of LMR16006 datasheet)
R(ESR) : 0.637 Ohm (follow equation 8, on page 13 of LMR16006 datasheet)
Our circuit
ESR of Capacitor