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LTC2927ITS8-TRPBF 数据表(PDF) 12 Page - Linear Technology |
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LTC2927ITS8-TRPBF 数据表(HTML) 12 Page - Linear Technology |
12 / 16 page LTC2927 12 2927fb Figure 15. Supply Sequencing (from Figure 16) Figure 16. Supply Sequencing Example 1V/DIV 10ms/DIV MASTER SLAVE1 SLAVE2 2927 F15 10ms/DIV 1V/DIV MASTER 3.3V RONB 138k RONA 100k ON RAMP SLAVE1 1.8V VCC 3.3V EARLY VIN 3.3V LTC2927 GND SDO RUN/SS FB IN DC/DC FB = 1.235V OUT RAMPBUF TRACK 0.1μF RTB1 1.65k RFB1 16.5k RFA1 35.7k RTA1 3.48k ON RAMP SLAVE2 2.5V 2927 F16 VCC 3.3V EARLY 3.3V LTC2927 GND SDO RUN/SS FB IN DC/DC FB = 0.8V OUT RAMPBUF TRACK 0.1μF 0.1μF RTB2 88.7k RFB2 887k RFA2 412k RTA2 36.5k In Figure 15, the slave 1 supply and the slave 2 supply are sequenced instead of tracking. The 3.3V master ramps up at 100V/s. 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 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 supply yields: 1. Set the ramp rate of the master signal. From Equation 1: C A Vs F RAMP == μ 10 100 01 μ / . 2. Solve for the pair of resistors that provide the desired slave supply behavior, assuming no delay. Rk Vs Vs k TB =• = 16 5 100 1000 165 . / / . ΩΩ 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 . . . . . . . . ΩΩ Ω Ω 3. Choose RTA to obtain desired delay. From Equation 4: R Vk ms V s k TA ″ = • • = 08 165 10 100 132 .. / . Ω Ω From Equation 5: Rk k k TA =− = 213 1 32 348 .. . ΩΩ Ω Supply Sequencing Example APPLICATIO S I FOR ATIO |
类似零件编号 - LTC2927ITS8-TRPBF |
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类似说明 - LTC2927ITS8-TRPBF |
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