Datasheet LTC3803 (Analog Devices) - 13

LTC3803
TYPICAL APPLICATIONS 4:1 Input Range 3.3V Output Isolated Flyback DC/DC Converter
T1 + + PA1277NL V V OUT IN 3.3V 18V TO 72V • 100μF 3A 2.2μF 220k 6.3V MMBTA42 V – PDS1040 IN 100k • × 3 GND 68Ω BAS516 PDZ6.8B V 150pF CC 10Ω BAS516 680Ω 22Ω • 1 6 0.1μF I GATE FDC2512 TH/RUN 2 5 GND VCC V + OUT LTC3803 4.7k 3 4 V SENSE FB BAT760 0.1μF 0.040Ω V 270Ω CC 1 6 V + 6.8k OUT BAS516 PS2801-1 VIN OPTO 1 0.1μF 2.2nF 47pF LT4430 56k 2 5 GND COMP 2 0.33μF 100k 3 4 OC FB BAS516 22.1k 3803 TA05
Effi ciency vs Load Current
84 82 80 78 76 EFFICIENCY (%) 74 72 VIN = 48V VIN = 24V 70 0 1 2 3 4 IOUT (A) 3803 TA05a 3803fc 13 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATIONS RELATED PARTS