Datasheet LTC1775 (Analog Devices) - 5

LTC1775
W U TYPICAL PERFOR A CE CHARACTERISTICS Maximum Current Sense Voltage Maximum Current Sense Voltage Oscillator Frequency vs Duty Cycle vs Temperature vs Temperature
350 320 300 300 250 SYNC = 1.5V 310 250 200 200 SYNC = 0V 300 150 150 FREQUENCY (kHz) 100 100 290 50 50 MAXIMUM CURRENT SENSE VOLTAGE (mV) MAXIMUM CURRENT SENSE VOLTAGE (mV) 0 280 0 0 0.2 0.4 0.6 0.8 1.0 –40 –15 10 35 60 85 110 135 –40 –15 10 35 60 85 110 135 DUTY CYCLE TEMPERATURE (°C) TEMPERATURE (°C) 1775 • G10 1775 • G11 1775 • G12
RUN/SS Pin Current vs FCB Pin Current vs Temperature Temperature Soft Start
0 0 RUN/SS –1 5V/DIV – 0.5 µA) µA) –2 VOUT 5V/DIV – 1.0 –3 FCB CURRENT ( IL – 1.5 RUN/SS CURRENT ( 5A/DIV –4 – 2.0 –5 –40 –15 10 35 60 85 110 135 –40 –15 10 35 60 85 110 135 VIN = 20V 20ms/DIV V TEMPERATURE (°C) TEMPERATURE (°C) OUT = 5V RLOAD = 0.5Ω 1775 • G13 1775 • G14 FIGURE 1 CIRCUIT 1530 G16
Transient Response Transient Response (Burst Mode Operation) Burst Mode Operation
V V V OUT OUT OUT 50mV 100mV 100mV /DIV /DIV /DIV ITH 100mV /DIV IL 5A/DIV IL IL 5A/DIV 2A/DIV V 100µs/DIV V IN = 20V IN = 20V 200µs/DIV VIN = 20V 20µs/DIV V V OUT = 5V OUT = 5V VOUT = 5V I I LOAD = 2A TO 8A LOAD = 100mA TO 2A ILOAD = 100mA FIGURE 1 CIRCUIT 1530 G18 FIGURE 1 CIRCUIT 1530 G17 FIGURE 1 CIRCUIT 1530 G15 5