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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC2925IGN датащи(PDF) 16 Page - Linear Technology |
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LTC2925IGN датащи(HTML) 16 Page - Linear Technology |
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16 / 20 page  LTC2925 16 2925f APPLICATIO S I FOR ATIO Supply Sequencing Example In Figure 17, the three slave supplies are sequenced in- stead of tracking. As in the coincident tracking example, the 3.3V master supply ramps up at 100V/s through an external FET, so step 1 remains the same. The 1.8V slave 1 supply ramps up at 1000V/s beginning 10ms after the master signal starts to ramp up. The 2.5V slave 2 supply ramps up at 1000V/s beginning 20ms after the master signal begins to ramp up. The 1.5V slave 3 supply ramps up at 1000V/s beginning 25ms after the master signal begins to ramp up. Note that not every combination of ramp rates and delays is possible. Small delays and large ratios of slave ramp rate to master ramp rate may result in solutions that require negative resistors. In such cases, either the delay must be increased or the ratio of slave ramp rate to master ramp rate must be reduced. In this example, solving for the slave 1 supply yields: 2. Solve for the pair of resistors that provide the desired slave supply behavior, assuming no delay. From Equation 2: Rk Vs Vs k TB =• ≈ 16 5 100 1000 165 .. From Equation 3: R V V k V k V k k TA ′= + ≈ 08 1 235 16 5 1 235 35 7 08 165 213 . . . . . – . . –. 3. Choose RTA to obtain the desired delay. From Equation 4: R Vk ms V s k TA ″ == 08 165 10 100 132 .• . • . From Equation 5: Rk k k TA =≈ –. || . . 213 1 32 348 Figure 17. Supply Sequencing from Figure 18 MASTER SLAVE2 SLAVE1 SLAVE3 0.015 Ω Q1 Si4412ADY 0.1 µF CPGTMR 0.82 µF 10k VCC SENSEP SENSEN 3.3V VIN 3.3V RONB 154k 3.3V VIN RTB1 1.65k RTB2 8.87k RFA2 41.2k 2.5V SLAVE2 MASTER RFB2 88.7k RTA2 4.87k RTB3 8.66k RTA3 3.74k RTA1 3.48k RONA 100k RAMPBUF TRACK1 TRACK2 TRACK3 FB2 GATE LTC2925 PGTMR CSDTMR 0.082 µF SDTMR CSCTMR 0.41 µF SCTMR GND 2925 F18 RAMP RFA3 100k 1.5V SLAVE3 RFB3 86.6k DC/DC IN FB = 0.8V OUT DC/DC IN FB = 0.8V RUN/SS RUN/SS OUT FB3 3.3V PGI RFA1 35.7k 1.8V SLAVE1 RFB1 16.5k SUPPLY MONITOR DC/DC IN FB = 1.235V RUN/SS OUT FB1 FAULT ON 10k VIN STATUS REMOTE RST SD3 SD2 SD1 CGATE 0.1 µF 10 Ω Figure 18. Supply Sequencing Example 10ms/DIV 2925 F17b 10ms/DIV 2925 F17a 1V/DIV 1V/DIV |
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