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Focus on DCS, PLC, robot control system and large servo system.
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The peak switch current is given by: (46) Where ΔIL1 and ΔIL2 are the peak-to-peak inductor ripple currents of inductors L1 and L2 respectively. The rms current through the switch is given by: (47) 8.2.2.2.2 Power Diode Selection The Power diode must be selected to handle the peak current and the peak reverse voltage. In a SEPIC, the diode peak current is the same as the switch peak current. The off-state voltage or peak reverse voltage of the diode is VIN + VOUT. Similar to the boost converter, the average diode current is equal to the output current. Schottky diodes are recommended. 8.2.2.2.3 Selection of Inductors L1 and L2 Proper selection of the inductors L1 and L2 to maintain constant current mode requires calculations of the following parameters. Average current in the inductors: (48) IL2AVE = IOUT (49) Peak-to-peak ripple current, to calculate core loss if necessary: (50) (51) Maintaining the condition IL > ΔIL /2 to ensure continuous conduction mode yields the following minimum values for L1 and L2: (52) (53) Peak current in the inductor, to ensure the inductor does not saturate: (54) (55) IL1PK must be lower than the maximum current rating set by the current sense resistor. The value of L1 can be increased above the minimum recommended value to reduce input ripple and output ripple. However, once ΔIL1 is less than 20% of IL1AVE, the benefit to output ripple is minimal. By increasing the value of L2 above the minimum recommendation, ΔIL2 can be reduced, which in turn will reduce the output ripple voltage: (56) where ESR is the effective series resistance of the output capacitor
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