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LTM4600EVPBF 数据表(PDF) 18 Page - Linear Technology |
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LTM4600EVPBF 数据表(HTML) 18 Page - Linear Technology |
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18 / 24 page  LTM4600 18 4600fa inductor ripple current gets too high above 16V, and the 400ns minimum off-time is limited below 9V. Equations for setting frequency: ION = VIN – 0.7V/110k; for 5V input, ION = 39µA frequency = (ION/[2.4V • 10pF]) • DC; DC = duty cycle, duty cycle is (VOUT/VIN) t = tON + tOFF, tON = on-time, tOFF = off-time of the switching period; t = 1/frequency tOFF must be greater than 400ns, or t – tON > 400ns. tON = DC • t ~450kHz frequency or 2.22µs period is chosen for 5V to 3.3V. Frequency range is about 450kHz to 650kHz from 4.5V to 7V input. tON = 0.66 • 2.22µs ≅ 1.46ns tOFF = 2µs – 1.32ns ≅ 760ns tON and tOFF are above the minimums with adquate guard band. Using the frequency = (ION/[2.4V • 10pF]) • DC, solve for ION = (450kHz • 2.4V • 10pF) • (1/0.66) ≅ 16µA. ION current calculated from 5V input was 39µA, so a resistor from fADJ to ground = (0.7V/30.1k) = 23µA. 39µA – 23µA = 16µA, sets the adequate ION current for proper frequency range for the higher duty cycle conversion of 5V to 3.3V. Input voltage range is limited to 4.5V to 7V. Higher input voltages can be used without the 30.1k on fADJ. The inductor ripple current gets too high above 7V, and the 400ns minimum off-time is limited below 4.5V. APPLICATIO S I FOR ATIO 4600 F18 R2 22.1k 1% R1 30.1k EXTVCC RUN/SS COMP FCB VOUT 5V TO 3.3V AT 8A WITH fADJ = 30.1k C1, C3: TDK C3216X5R1E106MT C2: TAIYO YUDEN, JMK316BJ226ML C4: SANYO POS CAP, 6TPE330MIL PGOOD VOSET SVIN PGND SGND 4.5V TO 7V 3.3V AT 8A C1 10 µF 25V C3 10 µF 25V C4 330 µF 6.3V C2 22 µF C5 100pF VIN LTM4600EV fADJ RUN/SOFT-START OPEN DRAIN EFFICIENCY = 93% + 4600 F19 R2 13.7k 1% R1 15k EXTVCC RUN/SS COMP FCB VOUT 12V TO 5V AT 8A WITH fADJ = 15k C1, C3: TDK C3216X5R1E106MT C2: TAIYO YUDEN, JMK316BJ226ML C4: SANYO POS CAP, 6TPE330MIL PGOOD VOSET SVIN PGND SGND 9V TO 16V 5V AT 8A EFFICIENCY = 93% C1 10 µF 25V C3 10 µF 25V C4 330 µF 6.3V C2 22 µF C5 100pF VIN LTM4600EV fADJ RUN/SOFT-START OPEN DRAIN + 5V to 3.3V at 8A 12V to 5V at 8A |
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