Datasheet LTC7801 (Analog Devices) - 6

LTC7801
Typical perForMance characTerisTics Efficiency and Power Loss vs Load Current Efficiency vs Load Current Efficiency vs Input Voltage
100 10k 100 100 BURST EFFICIENCY 90 90 98 80 80 96 FCM LOSS PULSE–SKIPPING 1k POWER LOSS (mW) 70 70 94 LOSS 60 60 92 50 100 50 90 PULSE–SKIPPING BURST LOSS 40 40 88 EFFICIENCY (%) EFFICIENCY EFFICIENCY (%) EFFICIENCY (%) 30 30 86 10 20 V FIGURE 13 CIRCUIT IN = 24V 20 V 84 FIGURE 13 CIRCUIT IN = 48V V 10 IN = 24V 10 FIGURE 13 CIRCUIT VIN = 100V V 82 OUT = 12V FCM EFFICIENCY VOUT = 12V VOUT = 12V VIN = 140V ILOAD = 4A 0 1 0 80 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 0.1 1 10 20 40 60 80 100 120 140 LOAD CURRENT (A) LOAD CURRENT (A) INPUT VOLTAGE (V) 7801 G01 7801 G02 7801 G03
Load Step Burst Mode Load Step Load Step Forced Operation Pulse-Skipping Mode Continuous Mode
VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV AC COUPLED AC COUPLED AC COUPLED IL IL IL 1A/DIV 1A/DIV 1A/DIV 7801 G04 200µs/DIV 7801 G04 7801 G06 200µs/DIV 200µs/DIV VIN = 24V VIN = 24V VIN = 24V FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT
Regulated Feedback Voltage Inductor Current at Light Load Soft Start-Up vs Temperature
808 VOUT FORCED 2V/DIV 806 CONTINUOUS MODE 804 TAGE (V) BURST MODE 802 RUN OPERATION 2V/DIV 2A/DIV 800 PULSE 798 SKIPPING TED FEEDBACK VOL MODE 796 7801 G07 7801 G08 200µs/DIV 2ms/DIV REGULA 794 VIN = 24V VIN = 24V FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT 792–75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) 7801 G09 7801f 6 For more information www.linear.com/LTC7801 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts