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LT3510 Datasheet(PDF) 22 Page - Linear Technology |
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LT3510 Datasheet(HTML) 22 Page - Linear Technology |
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22 / 28 page  LT3510 22 3510fc inductor size by allowing an increase in frequency. A dual step down application (Figure 10) steps down the input voltage (VIN1) to the highest output voltage then uses that voltage to power the second output (VIN2). VOUT1 must be able to provide enough current for its output plus VOUT2 maximum load. Note that the VOUT1 must be above VIN2 minimum input voltage (2V) when the second channel starts to switch. Delaying channel 2 can be accomplished by either independent soft-start capacitors or sequencing with the PG1 output. For example, assume a maximum input of 24V: VIN = 24V, VOUT1 = 5V at 1.5A and VOUT2 = 1.2V at 1.5A Frequency Hz VV VV V t L V OUT D IN SW D MIN ON () – () ≤ + + ≥ IIN OUT OUT IN VV Vf –• • () Figure 10. 5V and 1.2V 2-Stage Step-Down Converter with Output Sequencing Single Step Down: Frequency Hz ns kH () .. –. . ≤ + + = 12 06 24 04 06 190 392 zz L kHz H L 1 24 5 5 24 392 10 2 24 12 12 2 = () ≥ = () –• • –. • . μ 4 4 392 27 • . kHz H ≥μ 2-Stage Step-Down: Frequency ns MHz Max Fr ≤ + + = 50 6 24 04 06 190 12 . –. . . eequency MHz L MHz H L = = () ≥ 12 1 24 5 5 24 1 2 33 2 . –• •. . μ == () ≥ 51 2 1 2 51 2 076 –. • . •. . MHz H μ SHDN 4.7μF 47μF 42.3k 100k 26.7k PMEG4005 8.06k PMEG4005 10pF 470pF 3.3μH 1μH VOUT1 5V VOUT2 1.2V VIN 6V TO 24V 0.47μF 47μF 2 0.47μF 10pF B360A B360A VIN1 VIN2 LT3510 GND BST1 SW1 IND1 VOUT1 PG1 FB1 VC1 SS/TRACK1 FSET BST2 SW2 IND2 VOUT2 PG2 FB2 VC2 SS/TRACK2 40.2k 4k 8.06k 3510 F10 32.4k 0.1μF 0.1μF 470pF APPLICATIONS INFORMATION |
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