Datasheet LTC3812-5 (Analog Devices) - 5

LTC3812-5
TYPICAL PERFORMANCE CHARACTERISTICS Short-Circuit/Fault Timeout Load Transient Response Start-Up Operation
VIN VOUT 20V/DIV 5V/DIV VOUT INTV 50mV/DIV INTVCC, CC SS/TRACK VOUT VOUT 2V/DIV 2V/DIV IOUT I 5A/DIV L IL 5A/DIV 2A/DIV 10μs/DIV 38125 G01 2ms/DIV 38125 G02 5ms/DIV 38125 G03 FRONT PAGE CIRCUIT FRONT PAGE CIRCUIT FRONT PAGE CIRCUIT V V V IN = 25V IN = 30V IN = 25V 0A TO 5A LOAD STEP ILOAD = 0.5A RSHORT = 0.1Ω FCB = 0V
Short-Circuit/Foldback Operation Pulse-Skipping Mode Operation Effi ciency vs Input Voltage
100 FRONT PAGE CIRCUIT VOUT VOUT f = 250kHz 5V/DIV 100mV/DIV 95 I ILOAD = 5A TH FORCED IL 0.5A/DIV CONTINUOUS 5A/DIV IL I 2A/DIV 90 LOAD = 0.5A FORCED CONTINUOUS EFFICIENCY (%) 200 I μs/DIV 38125 G04 20μs/DIV 38125 G05 LOAD = 0.5A PULSE-SKIPPING FRONT PAGE CIRCUIT FRONT PAGE CIRCUIT 85 VIN = 25V VIN = 25V IOUT = 100mA FCB = INTVCC 80 0 10 20 30 40 50 60 INPUT VOLTAGE (V) 38125 G06
Effi ciency vs Load Current Frequency vs Input Voltage Frequency vs Load Current
100 300 350 FRONT PAGE CIRCUIT FRONT PAGE CIRCUIT 290 FCB = 0V V 300 IN = 24V FORCED 280 CONTINUOUS LOAD = 5A 250 95 270 VIN = 42V 260 200 250 PULSE SKIPPING LOAD = 0A 150 240 EFFICIENCY (%) 90 FREQUENCY (kHz) FREQUENCY (kHz) 230 100 V 220 OUT = 12V FCB = INTV 50 CC 210 f = 250kHz 85 200 0 0 1 2 3 4 5 6 0 10 20 30 40 50 60 0 1 2 3 4 5 LOAD CURRENT (A) INPUT VOLTAGE (V) LOAD CURRENT (A) 38125 G07 LT1108 • TPC12 38125 G09 38125fc 5