Datasheet LTC3777 (Analog Devices) - 8

LTC3777
TYPICAL PERFORMANCE CHARACTERISTICS Shutdown from RUN Shutdown from RUN Start-Up Forced Continuous Mode Forced Continuous Mode Pulse-Skipping Mode Buck Region Boost Region Boost Region
RUN RUN 5V/DIV 5V/DIV SW1 100V/DIV SW1 SW1 SW2 100V/DIV 100V/DIV 100V/DIV SW2 SW2 100V/DIV 100V/DIV IL IL IL 500mA/DIV 20A/DIV 20A/DIV VOUT VOUT VOUT 50V/DIV 50V/DIV 50V/DIV 3777 G19 3777 G20 5ms/DIV 3777 G18 200µs/DIV 200µs/DIV VIN = 120V VIN = 24V VIN = 24V VOUT = 48V VOUT = 48V VOUT = 48V 15Ω RESISTIVE LOAD 5A LOAD 5A LOAD
Shutdown from RUN Shutdown from RUN Forced Continuous Mode Forced Continuous Mode Buck-Boost Region Buck Region Line Transient Rising Edge
RUN RUN 5V/DIV 5V/DIV VIN SW1 SW1 100V/DIV 100V/DIV 100V/DIV 12V to 120V SW2 SW2 ITH 100V/DIV 100V/DIV 2V/DIV I I L I L 20A/DIV L 2A/DIV 1A/DIV V V OUT OUT V 50V/DIV OUT 500mV/DIV 50V/DIV AC-COUPLED 200µs/DIV 3777 G21 200µs/DIV 3777 G22 1ms/DIV 3777 G23 VIN = 48V VIN = 120V VOUT = 48V VOUT = 48V VOUT = 48V NO LOAD ILOAD = 5A
Line Transient Falling Edge DRVCC vs Load Current DRVCC vs Load Current
10.5 6.5 VIN LDO, EXTVCC = 0V label2 label3 label4 label5 VIN LDO, EXTVCC = 0V EXTVCC = 12V EXTVCC = 8.5V VIN 100V/DIV ITH 10.0 6.0 2V/DIV I TAGE (V) TAGE (V) L 1A/DIV VOL VOL V CC CC OUT 500mV/DIV 9.5 DRV 5.5 DRV AC-COUPLED 1ms/DIV 3777 G24 V V OUT = 48V VIN = 12V IN = 12V DRVSET = V5 DRVSET = 0V 9.0 5.0 0 20 40 60 80 100 0 20 40 60 80 100 LOAD CURRENT (mA) LOAD CURRENT (mA) 3777 G25 3777 G26 Rev A 8 For more information www.analog.com Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS – SWITCHING BIAS SUPPLY PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS