Datasheet LTC7815 (Analog Devices) - 7
| Hersteller | Analog Devices |
| Beschreibung | Low IQ, 2.25MHz, Triple Output, Buck/Buck/Boost Synchronous Controller |
| Seiten / Seite | 38 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss. … |
| Dateiformat / Größe | PDF / 1.4 Mb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss. Efficiency. vs Output Current (Buck)
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LTC7815
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss Efficiency vs Output Current (Buck) vs Output Current (Buck) Efficiency vs Input Voltage (Buck)
100 10k 100 100 BURST EFFICIENCY 90 90 97 80 FCM LOSS 1k 80 POWER LOSS (mW) 70 70 93 PULSE–SKIPPING 60 LOSS 100 60 50 50 90 40 10 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) BURST LOSS 87 30 FCM EFFICIENCY 30 20 1 20 83 FIGURE 9 CIRCUIT PULSE–SKIPPING FIGURE 9 CIRCUIT V 10 IN = 12V V 10 OUT = 5V EFFICIENCY VOUT = 5V VIN = 20V ILOAD = 5A 0 0.1 0 80 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 0.1 1 10 0 5 10 15 20 25 30 35 40 LOAD CURRENT (A) LOAD CURRENT (A) INPUT VOLTAGE (V) 7815 G01 7815 G02 7815 G03 FIGURE 9 CIRCUIT VIN = 12V, VOUT = 5V
Load Step (Buck) Load Step (Buck) Load Step (Buck) Burst Mode Operation Pulse-Skipping Mode Forced Continuous Mode
VOUT VOUT V 100mV/DIV OUT 100mV/DIV 100mV/DIV AC-COUPLED AC-COUPLED AC-COUPLED IL IL I 3A//DIV 3A//DIV L 3A//DIV 20µs/DIV 7815 G04 V 20µs/DIV 7815 G05 20µs/DIV 7815 G06 IN = 12V V V V IN = 12V IN = 12V OUT = 5V V V FIGURE 9 CIRCUIT OUT = 5V OUT = 5V FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT
Inductor Current at Light Load Buck Regulated Feedback Voltage (Buck) Soft Start-Up (Buck) vs Temperature
808 FORCED 806 CONTINUOUS V MODE OUT1 2V/DIV 804 TAGE (mV) VOUT2 Burst Mode 2V/DIV 802 OPERATION 3A/DIV 800 RUN1/ PULSE– RUN2 798 SKIPPING 5V/DIV MODE TED FEEDBACK VOL 796 0.5µs/DIV 7815 G07 5ms/DIV 7815 G08 VIN = 12V V REGULA 794 IN = 12V VOUT = 5V FIGURE 9 CIRCUIT 792 ILOAD = 1mA –75 –50 –25 0 25 50 75 100 125 150 FIGURE 9 CIRCUIT TEMPERATURE (°C) 7815 G09 7815f For more information www.linear.com/LTC7815 7 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
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss Efficiency vs Output Current (Buck) vs Output Current (Buck) Efficiency vs Input Voltage (Buck)
100 10k 100 100 BURST EFFICIENCY 90 90 97 80 FCM LOSS 1k 80 POWER LOSS (mW) 70 70 93 PULSE–SKIPPING 60 LOSS 100 60 50 50 90 40 10 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) BURST LOSS 87 30 FCM EFFICIENCY 30 20 1 20 83 FIGURE 9 CIRCUIT PULSE–SKIPPING FIGURE 9 CIRCUIT V 10 IN = 12V V 10 OUT = 5V EFFICIENCY VOUT = 5V VIN = 20V ILOAD = 5A 0 0.1 0 80 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 0.1 1 10 0 5 10 15 20 25 30 35 40 LOAD CURRENT (A) LOAD CURRENT (A) INPUT VOLTAGE (V) 7815 G01 7815 G02 7815 G03 FIGURE 9 CIRCUIT VIN = 12V, VOUT = 5V
Load Step (Buck) Load Step (Buck) Load Step (Buck) Burst Mode Operation Pulse-Skipping Mode Forced Continuous Mode
VOUT VOUT V 100mV/DIV OUT 100mV/DIV 100mV/DIV AC-COUPLED AC-COUPLED AC-COUPLED IL IL I 3A//DIV 3A//DIV L 3A//DIV 20µs/DIV 7815 G04 V 20µs/DIV 7815 G05 20µs/DIV 7815 G06 IN = 12V V V V IN = 12V IN = 12V OUT = 5V V V FIGURE 9 CIRCUIT OUT = 5V OUT = 5V FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT
Inductor Current at Light Load Buck Regulated Feedback Voltage (Buck) Soft Start-Up (Buck) vs Temperature
808 FORCED 806 CONTINUOUS V MODE OUT1 2V/DIV 804 TAGE (mV) VOUT2 Burst Mode 2V/DIV 802 OPERATION 3A/DIV 800 RUN1/ PULSE– RUN2 798 SKIPPING 5V/DIV MODE TED FEEDBACK VOL 796 0.5µs/DIV 7815 G07 5ms/DIV 7815 G08 VIN = 12V V REGULA 794 IN = 12V VOUT = 5V FIGURE 9 CIRCUIT 792 ILOAD = 1mA –75 –50 –25 0 25 50 75 100 125 150 FIGURE 9 CIRCUIT TEMPERATURE (°C) 7815 G09 7815f For more information www.linear.com/LTC7815 7 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