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LTC3853IUJ-TR Datasheet(PDF) 5 Page - Linear Technology |
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LTC3853IUJ-TR Datasheet(HTML) 5 Page - Linear Technology |
5 / 36 page LTC3853 5 3853f TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Output Current and Mode Efficiency and Power Loss vs Input Voltage Efficiency vs Output Current and Mode Load Step (Burst Mode Operation) Load Step (Forced Continuous Mode) LOAD CURRENT (mA) 1.00E-02 1.00E-01 1.00E+00 1.00E+01 40 50 60 70 80 30 20 10 0 90 100 3853 G01 BURST DCM CCM VIN = 12V VOUT = 1.8V FIGURE 15 MODIFIED WITH DCR SENSING LOAD CURRENT (mA) 1.00E-02 1.00E-01 1.00E+00 1.00E+01 40 50 60 70 80 30 20 10 0 90 100 3853 G02 BURST DCM CCM VIN = 12V VOUT = 3.3V FIGURE 15 MODIFIED WITH DCR SENSING INPUT VOLTAGE (V) 0 75 80 85 15 25 3853 G03 70 65 60 510 20 90 95 100 1.0 0.8 1.2 1.4 0.4 0.6 0.2 0 1.6 1.8 2.0 30 VOUT = 3.3V IOUT = 2A FIGURE 15 MODIFIED WITH DCR SENSING EFFICIENCY POWER LOSS 40μs/DIV VOUT 100mV/DIV AC COUPLED IL 2A/DIV ILOAD 2A/DIV 3853 G04 VIN = 12V VOUT = 3.3V ILOAD = 0A TO 3A FIGURE 15 CIRCUIT 40μs/DIV VOUT 100mV/DIV AC COUPLED IL 2A/DIV ILOAD 2A/DIV 3853 G05 VIN = 12V VOUT = 3.3V ILOAD = 0A TO 3A FIGURE 15 CIRCUIT Inductor Current at Light Load Load Step (Pulse Skip Mode) 40μs/DIV VOUT 100mV/DIV AC COUPLED IL 2A/DIV ILOAD 2A/DIV 3853 G06 VIN = 12V VOUT = 3.3V ILOAD = 0A TO 3A FIGURE 15 CIRCUIT 1μs/DIV Burst Mode OPERATION 2A/DIV FORCED CONTINUOUS MODE 2A/DIV PULSE SKIPPING MODE 2A/DIV 3853 G07 VIN = 12 VOUT = 1.8V ILOAD = 100mA FIGURE 15 CIRCUIT |
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