Datasheet LTC3786 (Analog Devices) - 5

LTC3786 TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency and Power Loss Efficiency and Power Loss vs Output Current vs Output Current
100 10000 100 10000 90 90 80 1000 80 BURST 1000 POWER LOSS (mW) EFFICIENCY BURST POWER LOSS (mW) 70 70 LOSS 60 100 60 100 VIN = 12V 50 VOUT = 24V 50 40 FIGURE 8 CIRCUIT 10 40 10 EFFICIENCY (%) CCM EFFICIENCY EFFICIENCY (%) 30 CCM LOSS 30 20 BURST EFFICIENCY 1 20 VIN = 12V 1 BURST LOSS VOUT = 24V 10 PULSE-SKIPPING EFFICIENCY 10 Burst Mode OPERATION PULSE-SKIPPING LOSS FIGURE 8 CIRCUIT 0 0.1 0 0.1 0.01 0.1 1 10 0.00001 0.0001 0.001 0.01 0.1 1 10 OUTPUT CURRENT (A) OUTPUT CURRENT (A) 3786 G01 3786 G02
Load Step Load Step Efficiency vs Input Voltage Forced Continuous Mode Burst Mode Operation
100 ILOAD = 2A LOAD STEP 99 FIGURE 8 CIRCUIT LOAD STEP 2A/DIV 2A/DIV INDUCTOR INDUCTOR 98 CURRENT CURRENT VOUT = 12V V 5A/DIV OUT = 24V 5A/DIV 97 VOUT VOUT 96 500mV/DIV 500mV/DIV EFFICIENCY (%) 95 200µs/DIV 3786 G04 VIN = 12V 200µs/DIV 3786 G05 VIN = 12V 94 VOUT = 24V VOUT = 24V LOAD STEP FROM 200mA TO 2.5A LOAD STEP FROM 200mA TO 2.5A FIGURE 8 CIRCUIT FIGURE 8 CIRCUIT 93 0 5 10 15 20 25 INPUT VOLTAGE (V) 3786 G03
Load Step Pulse-Skipping Mode Inductor Current at Light Load Soft Start-Up
LOAD STEP FORCED 2A/DIV CONTINUOUS INDUCTOR MODE CURRENT VOUT 5A/DIV Burst Mode 5V/DIV OPERATION 5A/DIV VOUT 500mV/DIV PULSE- SKIPPING MODE 0V 200µs/DIV 3786 G06 VIN = 12V 5µs/DIV 3786 G07 VIN = 12V 2ms/DIV 3786 G08 VIN = 12V VOUT = 24V VOUT = 24V VOUT = 24V LOAD STEP FROM 200mA TO 2.5A ILOAD = 200µA FIGURE 8 CIRCUIT FIGURE 8 CIRCUIT FIGURE 8 CIRCUIT 3786fc For more information www.linear.com/LTC3786 5