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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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LTC1647-3IGN Arkusz danych(PDF) 20 Page - Linear Technology |
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LTC1647-3IGN Arkusz danych(HTML) 20 Page - Linear Technology |
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20 / 20 page  LTC1647-1/LTC1647-2/LTC1647-3 20 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 q FAX:(408)434-0507 q www.linear-tech.com ©LINEAR TECHNOLOGY CORPORATION 1999 1647f LT/TP 0100 4K • PRINTED IN USA RELATED PARTS TYPICAL APPLICATIO PART NUMBER DESCRIPTION COMMENTS LTC1421 2-Channel Hot Swap Controller 24-Pin, Operates from 3V to 12V and Supports –12V LTC1422 Hot Swap Controller in SO-8 System Reset Output with Programmable Delay LT1640L/LT1640H Negative Voltage Hot Swap Controller in SO-8 Operates from –10V to –80V LT1641 High Voltage Hot Swap Controller in SO-8 Operates from 9V to 80V LT1642 Fault Protected Hot Swap Controller Operates Up to 16.5V, Protected to 33V LTC1643L/LTC1643H PCI-Bus Hot Swap Controller 3.3V, 5V and ±12V in Narrow 16-Pin SSOP LT1645 2-Channel Hot Swap Controller Operates from 1.2V to 12V, Power Sequencing Hot Swapping Two Supplies Two separate supplies can be independently controlled by using the LTC1647-3. In some applications, sequencing between the two power supplies is a requirement. For example, it may be necessary to ramp-up one supply first before allowing the second supply to power-up, as well as requiring that this same supply ramp-down last on power- down. Figure 14’s circuit illustrates how to program the delays between the two pass transistors using the ON1 and ON2 pins (time events t1 to t4). t5 and t7 show both channels being switched on simultaneously where se- quencing is not crucial. Some applications require that both channels be gated off if a fault occurs in one channel. This is accomplished in Figure 14 by using a crisscross FAULT-to-SENSE arrange- ment of R3/R4 and R7/R8. t6 and t9 illustrate the circuit’s operation. Figure 14. Hot Swapping Two Supplies SENSE 1 15 13 FAULT 2 5V SUPPLY VOUT1 (5A) FAULT GND ON2 ON1 5 ON2 4 FAULT 1 3 ON1 2 GND 8 GATE 1 LTC1647-3 C1 10nF R2 10 Ω R1 0.01 Ω Q1 IRF7413 R3 100 Ω CLOAD + VCC1 SENSE 2 GATE 2 VCC2 1 14 12 16 R8 100 Ω 12V SUPPLY VOUT2 (2.5A) CLOAD + R5 10k R6 10k R4 4.7k R7 12k C3 10nF Q2 IRF7413 R9 10 Ω R10 0.02 Ω VR1 VR10 VON1 VON2 VOUT1 VOUT2 t6 t9 1647-1/2/3 F14 t3 t2 t1 t4 t5 t7 t8 |
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