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LTC3827EG-1-TR Datasheet(PDF) 9 Page - Linear Technology |
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LTC3827EG-1-TR Datasheet(HTML) 9 Page - Linear Technology |
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9 / 32 page  LTC3827-1 9 38271fe FUNCTIONAL DIAGRAM Main Control Loop The LTC3827-1 uses a constant frequency, current mode step-down architecture with the two controller channels operating 180 degrees out of phase. During normal op- eration, each external top 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 resis- tor divider connected across the output voltage, VOUT, to ground) to the internal 0.800V reference voltage. 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 matches the new load current. After the top MOSFET is turned off each cycle, the bottom 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. (Refer to Functional Diagram) SWITCH LOGIC + – 4.7V VIN VIN INTVCC-0.5V 0.8V FC BURSTEN CLK2 CLK1 + – + – – + – + INTERNAL SUPPLY RLP CLP PLLIN/MODE EXTVCC INTVCC SGND + 5.25V/ 7.5V LDO SW SHDN SLEEP 0.4V TOP BOOST TG CB CIN D DB PGND BOT BG INTVCC INTVCC VIN COUT VOUT 38271 FD RSENSE RB VFB DROP OUT DET FOLDBACK BOT TOP ON S R Q Q OSCILLATOR PHASE DET PLLLPF PLLIN/MODE FC BURSTEN EA 0.88V 0.80V TRACK/SS OV VFB 0.5μA 1μA 6V RA – + RC 2(VFB) RST SHDN TRACK/SS 1,13 2, 12 4, 10 3, 11 23, 18 25, 16 26, 15 24, 17 CC CC2 CSS 2(VFB) 0.45V SLOPE COMP 6mV + – – + SENSE– SENSE+ ICMP IR B RUN 8, 9 DUPLICATE FOR SECOND CONTROLLER CHANNEL + – – + FIN + – + – PGOOD1 VFB1 0.88V 0.72V L SHDN 6 5 27 22 20 19 7 28,14 21 ITH 100k OPERATION |
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