MB39A114 Datasheet, PDF (39/54 Pages) Fuji Electric – DC/DC Converter IC for Charging Li-ion Battery

12.6 V output
∆Vo
ESR ≤
∆IL
1
−
2πfCL
0.126
1
≤
−
1.2
2π × 300 × 10³ × 22 × 10^−6
≤ 80 mΩ
Capacitance value
16.8 V output
∆IL
CL ≥
2πf (∆Vo − ∆IL × ESR)
1.22
≥
2π × 300 × 10³ × (0.168 − 1.22 × 0.06)
≥ 6.8 µF
12.6 V output
∆IL
CL ≥
2πf (∆Vo − ∆IL × ESR)
1.2
≥
2π × 300 × 10³ × (0.126 − 1.2 × 0.06)
≥ 11.8 µF
Ripple current
16.8 V output
(VIN − Vo) tON
ICLrms ≥
2√3L
(25 − 16.8) × 0.672
≥
2√3 × 15 × 10^−6 × 300 × 10³
≥ 707 mArms
12.6 V output
(VIN − Vo) tON
ICLrms ≥
2√3L
(22 − 12.6) × 0.572
≥
2√3 × 15 × 10^−6 × 300 × 10³
≥ 690 mArms
MB39A114
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