Datasheet LT3845A (Analog Devices) - 9
| Manufacturer | Analog Devices |
| Description | High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency |
| Pages / Page | 26 / 9 — BLOCK DIAGRAM |
| File Format / Size | PDF / 295 Kb |
| Document Language | English |
BLOCK DIAGRAM
Model Line for this Datasheet
Text Version of Document
LT3845A
BLOCK DIAGRAM
C OUT V OUT 3845A FD R SENSE L1 M1 M2 D2 TIONAL) (OP D1 C BOOST C VCC R SET + – TG SW V CC BG f SET BOOST PGND SYNC SGND SENSE SENSE + Q DRIVER DRIVER S R – 10mV BOOSTED SWITCH DRIVER REVERSE CURRENT INHIBIT 110mV TOR TOR OSCILLA SLOPE COMP GENERA + S BST R UVLO Q NOL – DRIVE CONTROL SWITCH LOGIC DRIVE CONTROL TOR ARA SENSE CURRENT COMP TION Y Burst Mode OPERA INTERNAL SUPPL RAIL V CC UVLO (<6V) T AR T-ST 3.8V REG + – + – + – – + SOF + – FEEDBACK BURST DISABLE REFERENCE 1.231V BE UVLO 1V T CONDITIONS: 0.5V UVLO UVLO + V + IN CC SHDN 8V V REF + 100mV REG FAUL V V V CLAMPED TO V REF 2µA g m + V REF C SS – + – – AMP 100mV ERROR V IN – + UVLO (<4V) V IN SHDN BURST_EN V FB V C C SS R A R B R C C C2 C C1 C SS C IN V IN R2 R1 3845afa 9 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
BLOCK DIAGRAM
C OUT V OUT 3845A FD R SENSE L1 M1 M2 D2 TIONAL) (OP D1 C BOOST C VCC R SET + – TG SW V CC BG f SET BOOST PGND SYNC SGND SENSE SENSE + Q DRIVER DRIVER S R – 10mV BOOSTED SWITCH DRIVER REVERSE CURRENT INHIBIT 110mV TOR TOR OSCILLA SLOPE COMP GENERA + S BST R UVLO Q NOL – DRIVE CONTROL SWITCH LOGIC DRIVE CONTROL TOR ARA SENSE CURRENT COMP TION Y Burst Mode OPERA INTERNAL SUPPL RAIL V CC UVLO (<6V) T AR T-ST 3.8V REG + – + – + – – + SOF + – FEEDBACK BURST DISABLE REFERENCE 1.231V BE UVLO 1V T CONDITIONS: 0.5V UVLO UVLO + V + IN CC SHDN 8V V REF + 100mV REG FAUL V V V CLAMPED TO V REF 2µA g m + V REF C SS – + – – AMP 100mV ERROR V IN – + UVLO (<4V) V IN SHDN BURST_EN V FB V C C SS R A R B R C C C2 C C1 C SS C IN V IN R2 R1 3845afa 9 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
