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LTM4627EVPBF 数据表(PDF) 14 Page - Linear Technology |
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LTM4627EVPBF 数据表(HTML) 14 Page - Linear Technology |
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14 / 28 page  LTM4627 14 4627f its final value from the slave’s regulation point. Voltage tracking is disabled when VTRACK is more than 0.6V. RTA in Figure 4 will be equal to the RFB for coincident tracking. The TRACK/SS pin of the master can be controlled by an external ramp or the soft-start function of that regulator can be used to develop that master ramp. The LTM4627 can be used as a master by setting the ramp rate on its track pin using a soft-start capacitor. A 1.2μA current source is used to charge the soft-start capacitor. The following equation can be used: tSOFT-START = 0.6 • CSS 1.2µA ⎛ ⎝⎜ ⎞ ⎠⎟ Ratiometric tracking can be achieved by a few simple calculations and the slew rate value applied to the master’s TRACK/SS pin. As mentioned above, the TRACK/SS pin has a control range from 0V to 0.6V. The master’s TRACK/SS pin slew rate is directly equal to the master’s output slew rate in volts/time. The equation: MR SR • 60.4k = RTB where MR is the master’s output slew rate and SR is the slave’s output slew rate in volts/time. When coincident tracking is desired, then MR and SR are equal, thus RTB is equal to 60.4k. RTA is derived from equation: RTA= 0.6V VFB 60.4k + VFB RFB – VTRACK RTB where VFB is the feedback voltage reference of the regula- tor, and VTRACK is 0.6V. Since RTB is equal to the 60.4k APPLICATIONS INFORMATION Figure 4. Dual Outputs (1.5V and 1.2V) with Tracking COMP TRACK/SS RUN fSET MODE_PLLIN PGOOD VOUT VOUT_LCL DIFF_OUT VOSNS + VOSNS – VFB LTM4627 VIN R2 10k RFB1 40.2k R4 100k C10 22μF 16V C7 22μF 16V 82pF CSS SOFT-START CAPACITOR 470μF 6.3V 100μF 6.3V VOUT2 1.5V AT 15A C8 C11 C9 22μF 16V INTVCC EXTVCC VIN 6V TO 16V SGND GND + COMP TRACK/SS RUN fSET MODE_PLLIN PGOOD VOUT VOUT_LCL DIFF_OUT VOSNS + VOSNS – VFB LTM4627 VIN R1 10k RFB 60.4k R3 100k C2 22μF 16V C3 22μF 16V 82pF 470μF 6.3V 100μF 6.3V VOUT1 1.2V 15A C4 C6 C1 22μF 16V INTVCC EXTVCC 4627 F04 SGND GND + RTB 60.4k RTA 60.4k MASTER RAMP OR OUTPUT VIN 6V TO 16V 150pF 150pF |
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