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LTC1871-7 Datasheet(PDF) 11 Page - Linear Technology |
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LTC1871-7 Datasheet(HTML) 11 Page - Linear Technology |
11 / 36 page LTC3787 11 3787fc BLOCK DIAGRAM SLEEP SWITCHING LOGIC AND CHARGE PUMP + – 4.8V 3.8V VBIAS VIN CIN INTVCC PLLIN/ MODE PGOOD + – 1.32V 1.08V + – – – + – + VFB EXTVCC 5.4V LDO VCO PFD SW 0.425V SENS LO BOOST TG CB COUT VOUT DB CLKOUT PGND BG INTVCC VFB S R Q EA 1.32V SS 1.2V RSENSE 0.5μA/ 4.5μA 10μA 11V SHDN – + SHDN 2.5V – + RC SS SENS LO ITH CC CSS CC2 0.7V 2.8V SLOPE COMP 2mV + – – + SENSE – SENSE+ SHDN CLK2 CLK1 RUN SGND INTVCC FREQ DUPLICATE FOR SECOND CONTROLLER CHANNEL + – + – L + – EN 5.4V LDO EN 20μA 100k SYNC DET ILIM PHASMD OV 3787 BD CURRENT LIMIT ICMP IREV OPERATION Main Control Loop The LTC3787 uses a constant-frequency, current mode step-up architecture with the two controller channels operating out of phase. During normal operation, each external bottom MOSFET is turned on when the clock for that channel sets the RS latch, and is turned off when the main current comparator, ICMP, resets the RS latch. The peak inductor current at which ICMP trips and resets the latch is controlled by the voltage on the ITH pin, which is the output of the error amplifier EA. The error amplifier compares the output voltage feedback signal at the VFB pin (which is generated with an external resistor divider connected across the output voltage, VOUT, to ground), to the internal 1.200V reference voltage. In a boost converter, the required inductor current is determined by the load current, VIN and VOUT. When the load current increases, it causes a slight decrease in VFB relative to the reference, which causes the EA to increase the ITH voltage until the average inductor current in each channel matches the new requirement based on the new load current. After the bottom MOSFET is turned off each cycle, the top MOSFET is turned on until either the inductor current starts to reverse, as indicated by the current comparator, IR, or the beginning of the next clock cycle. |
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