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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC2926IGN датащи(PDF) 21 Page - Linear Technology |
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LTC2926IGN датащи(HTML) 21 Page - Linear Technology |
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21 / 28 page  LTC2926 21 2926fa Offset Tracking Example Converting the circuit in the coincident tracking example to the offset tracking profile shown in Figure 17 is relatively simple. Here the 1.8V slave supply ramps up 1V below the master, and the 2.5V slave supply ramps up 0.5V below the master. The ramp rate remains the same (100V/s), as do the slave supplies’ minimum load resistances, so there are no changes necessary to steps 1 or 2 of the three-step APPLICATIO S I FOR ATIO Figure 17. Offset Tracking Waveforms from Figure 18 Circuit design procedure. Only step 3 must be considered. Be sure to verify that the chosen voltage offsets will allow the slave supplies to ramp up completely. In this example, if the voltage offset on the 1.8V supply were 2V, it could ramp up only to 3.3V – 2V = 1.3V. 3. Solve for the tracking resistors that set the desired ramp rate and voltage offset or time delay of the slave supply. From Equation 4: Rk Vs Vs k TB =• ⎛ ⎝⎜ ⎞ ⎠⎟ = 15 0 100 100 15 . ΩΩ Choose RTB = 15.0kΩ. Since offset is required, Equation 5a applies: ΔV = 1.0V From Equation 6: R V V k V k V k TA = +−+ 08 08 15 0 08 953 08 15 0 1 . . . . . . . . ΩΩΩ 0 0 15 0 531 V k k . . Ω Ω = Choose RTA = 5.36kΩ. 500mV/DIV MASTER SLAVE2 SLAVE1 5ms/DIV 2926 F17 500mV/DIV 5ms/DIV Figure 18. Offset Tracking Example RTB1 15.0k RTA1 5.36k 2926 F18 LTC2926 S1 FB1 RAMPBUF TRACK1 TRACK2 GND PGTMR VIN RTB2 15.0k RTA2 4.64k FAULT 10k CPGTMR 1 µF CMGATE 0.1 µF MGATE 0.1 µF 10 Ω VCC RAMP VIN STATUS STATUS/PGI ON ON/OFF NC RSGATE 10k 3.3V VIN Q0 IRF7413Z SGATE2 10 Ω Q2 IRF7413Z SGATE1 10 Ω 3.3V MASTER D1 RFB1 15.0k RFA1 9.53k S2 FB2 D2 RFB2 15.0k RFA2 5.76k FAULT OUT IN SENSE RX1 100 Ω 1.8V MODULE 3.3V Q1 IRF7413Z 1.8V SLAVE1 OUT IN SENSE RX2 100 Ω 2.5V MODULE 3.3V 2.5V SLAVE2 |
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