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LTC2927IDDB-PBF 数据表(PDF) 10 Page - Linear Technology |
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LTC2927IDDB-PBF 数据表(HTML) 10 Page - Linear Technology |
10 / 16 page LTC2927 10 2927fb This example converts the coincident tracking example to the ratiometric tracking profile shown in Figure 11. The ramp rate of the master signal remains unchanged (Step 1) and there is no delay in ratiometric tracking (Step 3), so only the result of step 2 in the 3-step design procedure needs to be considered. In this example, the ramp rate of the 1.8V slave 1 supply ramps up at 60V/s and the 2.5V slave 2 supply ramps up at 85V/s. Always verify that the chosen ramp rate will allow the supplies to ramp-up completely before RAMPBUF reaches VCC. If the 1.8V supply were to ramp-up at 50V/s it would only reach 1.65V because the RAMPBUF signal would reach its final value of VCC = 3.3V before the slave supply reached 1.8V. 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 60 27 4 . / / . ΩΩ From Equation 3: R V V k V k V k k TA ′ = +− ≈ 08 1 235 16 5 1 235 35 7 08 27 4 10 . . . . . . . ΩΩ Ω Ω Step 3 is unnecessary because there is no delay, so RTA = RTA’ Figure 11. Ratiometric Tracking (from Figure 12) 1V/DIV 10ms/DIV SLAVE1 MASTER SLAVE2 2927 F11 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 27.4k RFB1 16.5k RFA1 35.7k RTA1 10k ON RAMP SLAVE2 2.5V 2927 F12 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 1M RFB2 887k RFA2 412k RTA2 383k Ratiometric Tracking Example APPLICATIO S I FOR ATIO Figure 12. Ratiometric Tracking Example |
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类似说明 - LTC2927IDDB-PBF |
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