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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC4216IDE датащи(PDF) 20 Page - Linear Technology |
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LTC4216IDE датащи(HTML) 20 Page - Linear Technology |
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20 / 24 page  LTC4216 4216f 20 An example with LTC4216 mounted on the backplane is shown in Figure 15. In this case, the NPN transistor, Q1, and two resistors, R7 and R8, form the PCB connection sensing circuit with the ON pin. With the PCB out of the backplane connector, Q1 base is tied to load supply through R7, turning Q1 on and pulling the LTC4216’s ON pin low. The base of Q1 is also wired to the backplane connector pin. When the PCB is inserted into the backplane, Q1 base is grounded through a short pin connection on the PCB. This turns off Q1 and the LTC4216’s ON pin is allowed to pull high to the load supply through R8, turning it on. In the previous examples, the PCB connection sensing circuits are not wired with interrupt capability from the system controller. As shown in Figure 16, adding logic- level discrete N-channel MOSFETs, M2 and M3, and a couple of resistors allow interrupt control to the sensing circuit. M2 is held on by its gate, pulling high through R8 to the load supply until the PCB is mated firmly to the backplane connector. A low logic-level for both the ⎯⎯O⎯N/RST and ⎯O⎯N/OFF signals turns M2 and M3 off, allowing the ON pin to be pulled high and turning LTC4216 on. A high logic-level for the ⎯O⎯N/OFF signal turns off the device and pulls the GATE low. The device is reset by pulling the ⎯O⎯N/RST signal high. 5V Hot Swap Application Figure 17 shows a hot swap application circuit with VCC and SENSEP pins connected together to a 5V load supply (VIN). The resistive divider, R1/R2, sets the undervoltage threshold for the load supply and allows the system to start up only after the supply voltage rises above 4V. The resistive divider, R3/R4, monitors VOUT and signals the APPLICATIO S I FOR ATIO Figure 14. Single Channel 1.5V Hot Swap Controller Figure 15. Hot Swap Controller on Backplane with Staggered Pin Connections SENSEP SENSEN GATE TIMER FB FAULT RESET SS FILTER LTC4216 CX 100nF C4 10nF R1 20k 1% R4 13k 1% R6 10k R3 10k 1% R2 3.3k 1% LONG BACKPLANE CONNECTOR (FEMALE) PCB EDGE CONNECTOR (MALE) GND LONG SHORT C1 10nF C2 10nF C3 68nF VOUT 1.5V 5A VCC 3.3V VIN 1.5V GND M1 Si4864DY R5 10k + CLOAD 4700 µF FAULT RESET µP LOGIC 4216 F14 LONG 11 10 9 8 7 12 1 4 2 53 6 VCC PCB CONNECTION SENSING ON CY 330nF RSENSE 0.004 Ω RY 22 Ω RX 10 Ω SENSEP SENSEN GATE TIMER FAULT RESET FB SS FILTER LTC4216 CY 330nF R6 10k R9 100k CLOAD 1000 µF VOUT 3.3V 5A R3 10k 1% LONG BACKPLANE CONNECTOR (FEMALE) PCB EDGE CONNECTOR (MALE) GND LONG SHORT SHORT SHORT SHORT C1 10nF C2 4.7nF C3 33nF M1 Si4864DY R7 10k R5 10k FAULT RESET 4216 F15 11 10 9 8 7 12 1 45 3 6 Q1 2 VCC ON R8 10k + R4 39.2k 1% CX 100nF PCB CONNECTION SENSING VIN 3.3V Z1 Z1: SMAJ6.0A Q1: MMBT3904 RSENSE 0.004 Ω RY 22 Ω RX 10 Ω |
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