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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LT1952IGN Datenblatt(PDF) 22 Page - Linear Technology |
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LT1952IGN Datenblatt(HTML) 22 Page - Linear Technology |
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22 / 24 page  LT1952/LT1952-1 22 19521fd 36V to 72V Input, 3.3V 40A Converter An LT1952-based synchronous forward converter provides theidealsolutionforpowersuppliesrequiringhighefficiency at low output voltages and high load currents. The 3.3V 40A solution in Figure 18 achieves peak efficiencies of 92.5% (Figure 17) by minimizing power loss due to rectification at the output. Synchronous rectifier control output SOUT, with programmable delay, optimizes timing control for a secondary side synchronous MOSFET controller (LTC3900) which results in high efficiency synchronous rectification. TheLT1952/LT1952-1useaprecisioncurrentlimitthreshold at the OC pin combined with a soft-start hiccup mode to provide low stress output short-circuit protection. The maximum output current will vary only 10% over the full VIN range. During short-circuit the average power dissipation of the circuit will be lower than 15% of maximum rated power thanks to a soft-start controlled hiccup mode. APPLICATIONS INFORMATION This allows a significant reduction in power component sizing using the LT1952-based converter. OUTPUT CURRENT (A) 010 50 1952 F17 20 30 40 94 93 92 91 90 89 88 87 86 VIN = 48V VOUT = 3.3V fOSC = 300kHz Figure 17. LT1952-Based Synchronous Forward Converter Efficiency vs Load Current (For Circuit in Figure 18) Figure 18. 36V to 72V, 3.3V at 40A Synchronous Forward Converter • • • LTC3900 8V BIAS VU1 VU1 220pF BAT760 8V BIAS 3 FG 5 CG +VIN 36V TO 72V PA0912.002 BAS516 BCX55 VOUT 3.3V, 40A 10k 10k 10k 1nF 8V BIAS 1mF 15k 560Ω COUT 100μF 3x 0.1μF 2.2mF 1nF 12V Q2 PH3230 2x Q3 PH3230 2x 18V 270Ω PS2801 T2 Q4470-B 2.2nF VU1 18k 249k 80.6k 1μF 0.1μF 10k 10k 82k 47k 4 3 5 4 8 2 1 LT1009 LT1797 1952 F18 L1 SD_VSEC OUT LT1952 714 ROSC VIN 315 BLANK GND 98 SS_MAXDC PGND 513 DELAY 12 VR = 2.5V OC 611 COMP ISENSE 110 FB = 1.23V SOUT 216 Si7846 1 GND 6 CS+ 2 VCC 4 CS– 7 SYNC 8 TIMER 370k 10mΩ 1μF 470Ω 39k 13.2k 115k 27k 0.22μF 0.1μF 10k 59k 33k 2.2k 22k L1: PA0713, PULSE ENGINEERING ALL CAPACITORS X7R, CERAMIC, TDK T2: COILCRAFT |
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