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LTM4609 Datasheet(PDF) 16 Page - Linear Technology |
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LTM4609 Datasheet(HTML) 16 Page - Linear Technology |
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16 / 38 page  LTM4636-1 16 46361fa For more information www.linear.com/LTM4636-1 APPLICATIONS INFORMATION an accurate 4.99k resistor internally for the top feedback resistor.Figure5showsanexampleofcoincidenttracking. VOUT(SLAVE) 1 4.99k RTA • V TRACK VTRACK is the track ramp applied to the slave’s track pin. VTRACK has a control range of 0V to 0.6V, or the internal reference voltage. When the master’s output is divided down with the same resistor values used to set the slave’s output, then the slave will coincident track with the master until it reaches its final value. The master will continue to its final value from the slave’s regulation point (see Figure 6). Voltage tracking is disabled when VTRACK is more than 0.6V. RTA in Figure 5 will be equal to RFB for coincident tracking. The TRACK/SS pin of the master can be controlled by an externalramporthesoft-startfunctionofthatregulatorcan be used to develop that master ramp. The LTM4636-1 can be used as a master by setting the ramp rate on its track pin using a soft-start capacitor. A 1.25µA current source is used to charge the soft-start capacitor. The following equation can be used: tSOFT-START 0.6V • CSS 1.25µA Figure 4. Phase Selection Examples LTM4636-1 180 PHASE MODE_PLLIN PHMODE CLKOUT VOUT 3/4 INTVCC LTM4636-1 240 PHASE MODE_PLLIN PHMODE CLKOUT VOUT 3/4 INTVCC LTM4636-1 300 PHASE MODE_PLLIN PHMODE 46361 F04 CLKOUT VOUT 3/4 INTVCC LTM4636-1 0 PHASE MODE_PLLIN PHMODE R2 10k R1 30.1k CLKOUT VOUT LTM4636-1 0 PHASE MODE_PLLIN PHMODE CLKOUT VOUT LTM4636-1 90 PHASE MODE_PLLIN PHMODE CLKOUT VOUT LTM4636-1 180 PHASE MODE_PLLIN PHMODE CLKOUT VOUT LTM4636-1 270 PHASE MODE_PLLIN PHMODE CLKOUT VOUT 3/4 INTVCC INTVCC LTM4636-1 60 PHASE SIX PHASE FOUR PHASE LTM4636-1 0 PHASE MODE_PLLIN PHMODE CLKOUT VOUT LTM4636-1 120 PHASE MODE_PLLIN PHMODE CLKOUT VOUT LTM4636-1 240 PHASE MODE_PLLIN PHMODE CLKOUT VOUT THREE PHASE LTM4636-1 0 PHASE MODE_PLLIN PHMODE CLKOUT VOUT LTM4636-1 180 PHASE MODE_PLLIN PHMODE CLKOUT VOUT FLOAT INTVCC TWO PHASE MODE_PLLIN PHMODE CLKOUT VOUT 3/4 INTVCC LTM4636-1 120 PHASE MODE_PLLIN PHMODE CLKOUT VOUT 3/4 INTVCC VOUT PHASE 0 0 0 0 0 CLKOUT PHASE 90 90 120 60 180 PHMODE (V) 0 1/4 INTVCC FLOAT 3/4 INTVCC INTVCC PHASE SELECTION |
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