decrease rather rapidly near end of charge for NiMH cells. We have to design the circuit
assuming the lo
west input voltage to ensure enough duty cycle to store adequate energy
in the inductor. Again, we must choose the ripple current. We can choose a larger ripple
current of 100 mA since the high frequency allows use of relatively small capacitors
while still having small ripple voltage. We use the values from Figure 5.7 and Eq. (5-5):
L 2.6 (12.0 2.6)/(0.10 1.4 MHz 12.0) 15 H
The 1.4-MHz switching frequency allows very small fi lter capacitors that can be either
tantalum or ceramic. ...
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