Datasheet LTC3777 (Analog Devices) - 7

LTC3777
TYPICAL PERFORMANCE CHARACTERISTICS Forced Continuous Mode Pulse-Skipping Mode Forced Continuous Mode Boost Region Boost Region Buck-Boost Region
SW1 SW1 SW1 100V/DIV 100V/DIV 100V/DIV SW2 SW2 SW2 100V/DIV 100V/DIV 100V/DIV IL IL IL 5A/DIV 5A/DIV 1A/DIV VOUT VOUT VOUT 200mV/DIV 200mV/DIV 200mV/DIV AC-COUPLED AC-COUPLED AC-COUPLED 5µs/DIV 3777 G09 5µs/DIV 3777 G10 5µs/DIV 3777 G11 VIN = 24V VIN = 24V VIN = 48V VOUT = 48V VOUT = 48V VOUT = 48V ILOAD = 0A ILOAD = 0A ILOAD = 0A
Pulse-Skipping Mode Forced Continuous Mode Pulse-Skipping Mode Buck-Boost Region Buck Region Buck Region
SW1 SW1 SW1 100V/DIV 100V/DIV 100V/DIV SW2 SW2 SW2 100V/DIV 100V/DIV 100V/DIV IL IL IL 1A/DIV 5A/DIV 5A/DIV VOUT VOUT VOUT 200mV/DIV 200mV/DIV 200mV/DIV AC-COUPLED AC-COUPLED AC-COUPLED 5µs/DIV 3777 G12 5µs/DIV 3777 G13 5µs/DIV 3777 G14 VIN = 48V VIN = 120V VIN = 120V VOUT = 48V VOUT = 48V VOUT = 48V ILOAD = 0A ILOAD = 0A ILOAD = 0A
Start-Up from RUN Forced Continuous Mode Start-Up Forced Continuous Mode Start-Up Forced Continuous Mode Pre-Biased Output Boost Region Buck-Boost Region
SW1 50V/DIV SW1 SW1 100V/DIV 100V/DIV SW2 SW2 SW2 50V/DIV 100V/DIV 100V/DIV I I L L IL 5A/DIV 500mA/DIV 500mA/DIV VOUT V V OUT OUT 50V/DIV 50V/DIV 50V/DIV 3777 G16 3777 G17 2.5ms/DIV 3777 G15 5ms/DIV 5ms/DIV VIN = 24V VIN = 24V VIN = 48V VOUT = 48V VOUT = 48V VOUT = 48V VOUT PRE-BIAS = 12V 15Ω RESISTIVE LOAD 15Ω RESISTIVE LOAD 200mA LOAD Rev A For more information www.analog.com 7 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