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LTC3564EDCB-TRPBF Datasheet(PDF) 9 Page - Linear Technology |
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LTC3564EDCB-TRPBF Datasheet(HTML) 9 Page - Linear Technology |
9 / 20 page 9 LTC3564 3564f The basic LTC3564 application circuit is shown in Figure 1. External component selection is driven by the load require- ment and begins with the selection of L followed by CIN and COUT. Inductor Selection For most applications, the value of the inductor will fall in the range of 0.47 μH to 2.2μH. Its value is chosen based on the desired ripple current. Large value inductors lower ripple current and small value inductors result in higher ripple currents. Higher VIN or VOUT also increases the ripple current as shown in equation 1. A reasonable starting point for setting ripple current is ΔIL = 500mA (40% of 1.25A). Δ = ()( ) − ⎛ ⎝⎜ ⎞ ⎠⎟ I fL V V V L OUT OUT IN 1 1 (1) The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple current to prevent core saturation. Thus, a 1.5A rated inductor should be enough for most applications (1.25A + 250mA). For better efficiency, choose a low DC-resis- tance inductor. The inductor value also has an effect on Burst Mode operation. The transition to low current operation begins when the inductor current peaks fall to approximately 300mA. Lower inductor values (higher ΔIL) will cause this to occur at lower load currents, which can cause a dip in efficiency in the upper range of low current operation. In Burst Mode operation, lower inductance values will cause the burst frequency to increase. Inductor Core Selection Different core materials and shapes will change the size/ current and price/current relationship of an inductor. Toroid or shielded pot cores in ferrite or permalloy mate- rials are small and don’t radiate much energy, but gener- ally cost more than powdered iron core inductors with similar electrical characteristics. The choice of which style inductor to use often depends more on the price vs size requirements and any radiated field/EMI requirements than on what the LTC3564 requires to operate. Table 1 shows some typical surface mount inductors that work well in LTC3564 applications. APPLICATIO S I FOR ATIO Table 1. Representative Surface Mount Inductors MANUFATURER PART NUMBER VALUE ( μH) MAX DC CURRENT (A) DCR (m Ω) HEIGHT (mm) Toko A915AY-1R1M-DC53LC 1.1 3.25 16 3 1070AS-1R0N-DB3020C 1 1.9 47 2 Sumida CDRH4D18C/LD-1R1 1.1 2.1 24 2 CDRH3D14-1R2 1.2 2.2 36 1.5 CR5D11-1R0 1 2.2 40 1.2 CDRH2D18/HP-2R2 2.2 1.6 48 2 FDK MIPW3226D0R9M 0.9 1.4 70 1 Coilcraft LPO6610-122ML 1.2 2.1 80 1 LPS4018-222ML 2.2 2.5 70 1.8 Vishay IHLP1616ABERR47M01 0.47 5 20 1.2 IHLP1616ABER1R0M01 1 4 45 1.2 VIN LTC3564 RUN R1 3564 F01 R2 CF L CIN COUT SW VIN VOUT VFB GND Figure 1. LTC3564 General Schematic |
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