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LTC2927CDDB-TRPBF Datasheet(PDF) 11 Page - Linear Technology |
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LTC2927CDDB-TRPBF Datasheet(HTML) 11 Page - Linear Technology |
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11 / 16 page  LTC2927 11 2927fb Converting the circuit in the coincident tracking example to the offset tracking shown in Figure 13 is relatively simple. Here the 1.8V slave 1 supply ramps up 1V below the master. The ramp rate remains the same (100V/s), so there are no changes necessary to steps 1 and 2 of the 3-step design procedure. Only step 3 must be considered. Be sure to verify that the chosen voltage offset will allow the slave supply to ramp up completely. In this example, if the voltage offset were 2V, the slave supply would only ramp to 3.3V – 2V = 1.3V. 3. Choose RTA to obtain desired delay. First, convert the desired voltage offset, VOS, to a delay tD, using the ramp rate: t V S V Vs ms D OS S == = 1 100 10 6 / () From Equation 4: R Vk ms V s k TA ″ = • • = 0 8 16 5 10 100 13 2 .. / . Ω Ω From Equation 5: Rk k k TA =≈ 13 1 132 665 .. . ΩΩ Ω Figure 13. Offset Tracking (from Figure 14) 1V/DIV 10ms/DIV MASTER SLAVE1 SLAVE2 2927 F13 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 16.5k RFB1 16.5k RFA1 35.7k RTA1 6.65k ON RAMP SLAVE2 2.5V 2927 F14 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 887k RFB2 887k RFA2 412k RTA2 316k Offset Tracking Example APPLICATIO S I FOR ATIO Figure 14. Offset Tracking Example |
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