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LT1952IGN Datenblatt(PDF) 20 Page - Linear Technology |
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LT1952IGN Datenblatt(HTML) 20 Page - Linear Technology |
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20 / 24 page ![]() LT1952 20 1952f APPLICATIO S I FOR ATIO Figure 14. 36V to 72V Input to 5V at 20A Synchronous Forward Converter Figure 13. Output Voltage Transient Response (6A to 12A Load Step at 6A/µs) Figure 12. LT1952-Based Synchronous Forward Converter Efficiency vs Load Current (For Circuit in Figure 14) LOAD CURRENT (A) 0 25 20 1952 F12 5 10 15 98 96 94 92 90 88 86 VIN = 48V VOUT = 5V fOSC = 300kHz VDD CG PGND GND OPTO VCOMP VFB FG SYNC VAUX ICOMP +ISNS –ISNS OVP LTC1698 1 2 3 4 5 6 8 16 15 14 13 12 11 9 HCPL-M453 0.1µF 10VBIAS 6 5 4 1 2 3 SYNC 7VBIAS +V0UT R14 1.2k R16 12.4k R15 38.3k C9, 6.8nF 1µF X5R R13 270Ω 0.1µF T1 PA0491 Q2 PH3830 Q3 PH3830 L1 PA1393.152 C01 100µF X5R 2× +V0UT 5V 20A SYNC BAS516 220pF 560Ω T2 SOUT SOUT CIN 2.2µF 100V X5R +VIN 36V TO 72V 1952 F14 Q1: PHM15NQ20 PHILIPS SD_VSEC OUT OC ISENSE PGND GND VIN LT1952 BLANK DELAY 912 16 5 6 2 3 4 7 14 11 10 13 8 15 115k 1k 0.1µF 0.1µF 10VBIAS 475k 18.2k 22k 40k 33k 4.75k 9.53k 100k Q1 0.015Ω COMP 1 1µF 40k SYNC SOUT SS_MAXDC VREF FB ROSC VOUT (200mV/DIV) 0A IOUT (5A/DIV) 20µs/DIV 1952 F13 |
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