LMZ14202_15 Datasheet, PDF (19/31 Pages) Texas Instruments – SIMPLE SWITCHER 6V to 42V, 2A Power Module in Leaded SMT-TO Package

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LMZ14202
SNVS648J – JANUARY 2010 – REVISED OCTOBER 2015
500 mA/Div
2.00 2s/Div
Figure 34. Transition Mode Operation
V_IN = 24 V, V_O = 3.3 V, I_O = 0.35 A 2 μsec/div
The inductor internal to the module is 10 μH. This value was chosen as a good balance between low and high
input voltage applications. The main parameter affected by the inductor is the amplitude of the inductor ripple
current (I_LR). I_LR can be calculated with:
I_{LR P-P} = V_O × (V_IN– V_O)/(10 µH × f_SW × V_IN)
where
• V_IN is the maximum input voltage and f_SW is determined from Equation 10.
(17)
If the output current I_O is determined by assuming that I_O = I_L, the higher and lower peak of I_LR can be
determined. Be aware that the lower peak of I_LR must be positive if CCM operation is required.
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