LM3524DM datasheet(18/29 Pages) TI

18 / 29 page

LM2524D, LM3524D

SNVS766E – JUNE 2009 – REVISED MAY 2013

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Figure 26. 5V, 1 Amp Switching Regulator, Foil Side

Figure 27. Stuffing Diagram, Component Side

The Step-Up Switching Regulator

Figure 28 shows the basic circuit for a step-up switching regulator. In this circuit Q1 is used as a switch to

alternately apply VIN across inductor L1. During the time, tON, Q1 is ON and energy is drawn from VIN and stored

in L1; D1 is reverse biased and Io is supplied from the charge stored in Co. When Q1 opens, tOFF, voltage V1 will

rise positively to the point where D1 turns ON. The output current is now supplied through L1, D1 to the load and

any charge lost from Co during tON is replenished. Here also, as in the step-down regulator, the current through

L1 has a DC component plus some

ΔIL. ΔIL is again selected to be approximately 40% of IL. Figure 29 shows the

inductor's current in relation to Q1's ON and OFF times.

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