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LTC3854EMSE 数据表(PDF) 11 Page - Linear Technology |
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LTC3854EMSE 数据表(HTML) 11 Page - Linear Technology |
11 / 28 page LTC3854 3854fa applicaTions inForMaTion Figure 2. Buck Regulator Using DCR Current Sense capacitor is equal to the voltage drop across the inductor DCR • R2/(R1+R2). R2 may be used to scale the voltage across the same terminals when the DCR is greater than the target sense resistance. Check the manufacturer’s datasheetforspecificationsregardingtheinductorDCR,in ordertoproperlydimensiontheexternalfiltercomponents. The DCR of the inductor can also be measured using a precision RLC meter. Slope Compensation and Inductor Peak Current Slope compensation provides stability in constant-fre- quency architectures by preventing subharmonic oscil- lations at high duty cycles. It is accomplished internally by adding a compensating ramp to the inductor current signal. Normally, this results in a reduction of maximum inductor peak current for high duty cycles. However, the LTC3854 uses a novel scheme that allows the maximum inductor peak current to remain unaffected throughout all duty cycles. 3854 F02 LTC3854 VIN RUN/SS TG BOOST SW BG GND INTVCC ITH FB SENSE– SENSE+ M1 M2 CB DBOOST CIN CVINT CC2 CC RC CSS RFB1 L DCR R1 COUT C1 VOUT RFB2 VIN R2 INDUCTOR Inductor Value Calculation The inductor value has a direct effect on ripple current. The inductor ripple current ∆IL decreases with higher inductance or frequency and increases with higher VIN. LMIN = 1 ∆IL • fSW • VOUT 1− VOUT VIN(MAX) Accepting larger values of ∆IL allows the use of low value inductors, but results in a higher output voltage ripple and greater core losses. A reasonable starting point for setting ripple current is IL = 0.4 • (IMAX). The maximum ∆IL occurs at the maximum input voltage. Option 1: DCR within desired range R1• C1 = L DCR (R2 not used) Option 2: DCR > desired RSENSE R1||R2 • C1 = L DCR (at 20°C) RSENSE (EQ) = DCR(MAX)• R2 R1 +R2 |
类似零件编号 - LTC3854EMSE |
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类似说明 - LTC3854EMSE |
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