Datasheet LTC7802-3.3 (Analog Devices) - 6
| Fabricante | Analog Devices |
| Descripción | 40V Low IQ, 3MHz Dual, 2-Phase Synchronous Step-Down Controller with Spread Spectrum |
| Páginas / Página | 34 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss. vs Load … |
| Formato / tamaño de archivo | PDF / 1.5 Mb |
| Idioma del documento | Inglés |
TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss. vs Load Current. vs Output Current. Efficiency vs Load Current
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LTC7802-3.3
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss vs Load Current vs Output Current Efficiency vs Load Current Efficiency vs Input Voltage Efficiency vs Input V
100 100 100 100 BURST EFFICIENCY VOUT = 5V FIGURE 9 CIRCUIT 90 95 ILOAD1,2 = 8A PULSE–SKIPPING 98 80 10 EFFICIENCY 90 70 FCM EFFICIENCY POWER LOSS (W) 85 96 60 1 80 VOUT2 = 5V 94 50 FCM LOSS 75 40 92 V PULSE–SKIPPING BURST 0.1 70 OUT1 = 3.3V EFFICIENCY (%) LOSS EFFICIENCY (%) EFFICIENCY (%) 30 LOSS VIN = 8V 65 V 90 IN = 16V 20 V 0.01 60 V IN = 12V IN = 24V V 88 10 OUT = 5V 55 FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT Burst Mode OPERATION 0 0.001 50 86 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 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 780233 G01 780233 G02 780233 G03
Load Step Forced Load Step Burst Mode Operation Load Step Pulse-Skipping Mode Continuous Mode Forced Continuous Mode
VOUT VOUT V 500mV/DIV OUT 500mV/DIV 500mV/DIV INDUCTOR INDUCTOR INDUCTOR CURRENT CURRENT CURRENT 5A/DIV 5A/DIV 5A/DIV LOAD LOAD LOAD CURRENT CURRENT CURRENT 5A/DIV 5A/DIV 5A/DIV 50µs/DIV 780233 G04 50µs/DIV 780233 G05 50µs/DIV 780233 G06 VIN = 12V VIN = 12V VIN = 12V VOUT = 5V VOUT = 5V VOUT = 5V 300mA TO 8A LOAD STEP 300mA TO 8A LOAD STEP 300mA TO 8A LOAD STEP FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT
Regulated Feedback Voltage Inductor Current at Light Load Soft Start-Up vs Temperature
1.00 FORCED 0.75 RUN1,2 CONTINUOUS 5V/DIV MODE V 0.50 OUT2 TAGE (%) 1V/DIV TAGE 0.25 BURST MODE TED VOL OPERATION VOL V 0 2A/DIV OUT1 1V/DIV PULSE –0.25 SKIPPING MODE –0.50 780233 G08 4µs/DIV 780233 G07 1ms/DIV –0.75 V CHANGE IN REGULA IN = 12V VIN = 12V VOUT = 5V FORCED CONTINUOUS MODE –1.00 NO LOAD FIGURE 9 CIRCUIT –55 –25 5 35 65 95 125 155 FIGURE 9 CIRCUIT TEMPERATURE (°C) 78023 G09 Rev. 0 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration 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 vs Load Current vs Output Current Efficiency vs Load Current Efficiency vs Input Voltage Efficiency vs Input V
100 100 100 100 BURST EFFICIENCY VOUT = 5V FIGURE 9 CIRCUIT 90 95 ILOAD1,2 = 8A PULSE–SKIPPING 98 80 10 EFFICIENCY 90 70 FCM EFFICIENCY POWER LOSS (W) 85 96 60 1 80 VOUT2 = 5V 94 50 FCM LOSS 75 40 92 V PULSE–SKIPPING BURST 0.1 70 OUT1 = 3.3V EFFICIENCY (%) LOSS EFFICIENCY (%) EFFICIENCY (%) 30 LOSS VIN = 8V 65 V 90 IN = 16V 20 V 0.01 60 V IN = 12V IN = 24V V 88 10 OUT = 5V 55 FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT Burst Mode OPERATION 0 0.001 50 86 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 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 780233 G01 780233 G02 780233 G03
Load Step Forced Load Step Burst Mode Operation Load Step Pulse-Skipping Mode Continuous Mode Forced Continuous Mode
VOUT VOUT V 500mV/DIV OUT 500mV/DIV 500mV/DIV INDUCTOR INDUCTOR INDUCTOR CURRENT CURRENT CURRENT 5A/DIV 5A/DIV 5A/DIV LOAD LOAD LOAD CURRENT CURRENT CURRENT 5A/DIV 5A/DIV 5A/DIV 50µs/DIV 780233 G04 50µs/DIV 780233 G05 50µs/DIV 780233 G06 VIN = 12V VIN = 12V VIN = 12V VOUT = 5V VOUT = 5V VOUT = 5V 300mA TO 8A LOAD STEP 300mA TO 8A LOAD STEP 300mA TO 8A LOAD STEP FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT FIGURE 9 CIRCUIT
Regulated Feedback Voltage Inductor Current at Light Load Soft Start-Up vs Temperature
1.00 FORCED 0.75 RUN1,2 CONTINUOUS 5V/DIV MODE V 0.50 OUT2 TAGE (%) 1V/DIV TAGE 0.25 BURST MODE TED VOL OPERATION VOL V 0 2A/DIV OUT1 1V/DIV PULSE –0.25 SKIPPING MODE –0.50 780233 G08 4µs/DIV 780233 G07 1ms/DIV –0.75 V CHANGE IN REGULA IN = 12V VIN = 12V VOUT = 5V FORCED CONTINUOUS MODE –1.00 NO LOAD FIGURE 9 CIRCUIT –55 –25 5 35 65 95 125 155 FIGURE 9 CIRCUIT TEMPERATURE (°C) 78023 G09 Rev. 0 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts