LA5724MC

PS No.A2021-6/6

6. Inductance current: peak value

The ripple current peak value must be held within the rated current values for the inductor used. Here, IRP id the ripple

current. IRP can be determined from the folloeing equation.

IRP = IOUT +

VIN - VOUT - Vsat

2L

× Tom

= 0.5 +

12 - 5.0 - 0.4

2

× 120×10

-6

× 2.8×10

-6

≈ 0.57A

7. Inducrance current: ripple current value

Here

ΔIR is the ripple current. ΔIR can be determined from the folloeing equation. If the load current becomes less than

one half the ripple current, the icductor current will become discontinuous.

ΔIR =

VIN - VOUT - Vsat

L

× Tom

=

12 - 5.0 - 0.4

120

×10

-6

× 2.8×10

-6

≈ 0.15A

8. Diode D1

A Schottky barrier diode must be used for the diode. If a fast recovery diode si used, it is possible that the IC could be

destroyed be the applied reverse voltage due to the recovety and the on-state voltage.

9. Diode current: peak current

Applecations must be designed so that the peak value of the diode current remains within the rated current of the diode.

The peak value of the diode current will be the same current as the peak value of the inductor current.

10. Repetitive pwak reverse voltage

Application must be designed so that the repetitive peak reverse voltage remains within the voltage rating og the diode.

Here, VRRM is the repetitive peak reverse voltage. VRRM can be determined from the folloeing equation.

VRRM ≥ VCC

Since moise voltage and other terms will be added in actual in actual operation, the voltage headling caoacity of the

device should be about 1.5 times that given by the above calculation.

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