Datasheet LTC7817 (Analog Devices) - 7
| 制造商 | Analog Devices |
| 描述 | 40V, Low IQ, 3MHz, Triple Output Buck/Buck/Boost Synchronous Controller |
| 页数 / 页 | 44 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss. vs Output … |
| 文件格式/大小 | PDF / 3.0 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Efficiency and Power Loss. vs Output Current (Buck). Efficiency vs Input V
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LTC7817
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss Efficiency and Power Loss Efficiency and Power Loss Efficiency and Power Loss vs Output Current (Buck) vs Output Current (Buck) vs Output Current (Buck) vs Output Current (Buck) Efficiency vs Input V Efficiency vs Input V oltage (Buck) oltage (Buck)
100 100 100 100 100 BURST EFFICIENCY VIN = 10V 90 VOUT = 5V PULSE–SKIPPING 90 10 80 10 95 EFFICIENCY 70 EFFICIENCY POWER LOSS (W) FCM EFFICIENCY POWER LOSS (W) 80 1 60 1 90 FCM LOSS 50 70 0.1 40 PULSE–SKIPPING 0.1 POWER LOSS 85 V EFFICIENCY (%) LOSS BURST EFFICIENCY (%) 60 0.01 IN = 10V EFFICIENCY (%) 30 V LOSS OUT = 5V ILOAD = 4A 20 V 0.01 80 IN = 10V 50 0.001 V 10 f OUT = 5V fSW=380kHz (FIGURE 10) SW = 380kHz (FIGURE 10) f FIGURE 10 CIRCUIT fSW=2.25MHz (FIGURE 14) SW = 2.25MHz (FIGURE 14) 0 0.001 40 0.0001 75 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 0.1 1 10 4 12 20 28 36 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 7817 G01 7817 G02 7817 G03
Load Step (Buck) Load Step (Buck) Load Step (Buck) Load Step (Buck) Load Step (Buck) Load Step (Buck) Burst Mode Operation Pulse-Skipping Mode Pulse–Skipping Mode Forced Continuous Mode Forced Continuous Mode
VOUT VOUT VOUT 200mV/DIV 200mV/DIV 200mV/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 7817 G06 50µs/DIV 7817 G04 50µs/DIV 7817 G05 50µs/DIV VIN = 10V VIN = 10V VIN = 10V VOUT = 5V VOUT = 5V VOUT = 5V 300mA TO 6A LOAD STEP 300mA TO 6A LOAD STEP 300mA TO 6A LOAD STEP FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT
Inductor Current at Light Load Inductor Current at Light Load Buck Regulated Feedback V Buck Regulated Feedback oltage (Buck) Soft Start-Up Soft Start–Up vs T V emperature oltage vs Temperature
808 FORCED 806 RUN1,2 CONTINUOUS 5V/DIV MODE 804 TAGE (mV) V TAGE OUT2 802 BURST MODE 1V/DIV OPERATION VOL 800 2A/DIV VOUT1 PULSE 1V/DIV 798 SKIPPING MODE TED FEEDBACK VOL 796 4µs/DIV 7817 G07 1ms/DIV 7817 G08 794 V REGULA IN = 10V V VIN = 10V OUT = 5V 792 NO LOAD FIGURE 10 CIRCUIT –55 –25 5 35 65 95 125 155 FIGURE 10 CIRCUIT TEMPERATURE (oC) 7817 G09 Rev 0 For more information www.analog.com 7 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 Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency and Power Loss Efficiency and Power Loss Efficiency and Power Loss Efficiency and Power Loss vs Output Current (Buck) vs Output Current (Buck) vs Output Current (Buck) vs Output Current (Buck) Efficiency vs Input V Efficiency vs Input V oltage (Buck) oltage (Buck)
100 100 100 100 100 BURST EFFICIENCY VIN = 10V 90 VOUT = 5V PULSE–SKIPPING 90 10 80 10 95 EFFICIENCY 70 EFFICIENCY POWER LOSS (W) FCM EFFICIENCY POWER LOSS (W) 80 1 60 1 90 FCM LOSS 50 70 0.1 40 PULSE–SKIPPING 0.1 POWER LOSS 85 V EFFICIENCY (%) LOSS BURST EFFICIENCY (%) 60 0.01 IN = 10V EFFICIENCY (%) 30 V LOSS OUT = 5V ILOAD = 4A 20 V 0.01 80 IN = 10V 50 0.001 V 10 f OUT = 5V fSW=380kHz (FIGURE 10) SW = 380kHz (FIGURE 10) f FIGURE 10 CIRCUIT fSW=2.25MHz (FIGURE 14) SW = 2.25MHz (FIGURE 14) 0 0.001 40 0.0001 75 0.0001 0.001 0.01 0.1 1 10 0.0001 0.001 0.01 0.1 1 10 4 12 20 28 36 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 7817 G01 7817 G02 7817 G03
Load Step (Buck) Load Step (Buck) Load Step (Buck) Load Step (Buck) Load Step (Buck) Load Step (Buck) Burst Mode Operation Pulse-Skipping Mode Pulse–Skipping Mode Forced Continuous Mode Forced Continuous Mode
VOUT VOUT VOUT 200mV/DIV 200mV/DIV 200mV/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 7817 G06 50µs/DIV 7817 G04 50µs/DIV 7817 G05 50µs/DIV VIN = 10V VIN = 10V VIN = 10V VOUT = 5V VOUT = 5V VOUT = 5V 300mA TO 6A LOAD STEP 300mA TO 6A LOAD STEP 300mA TO 6A LOAD STEP FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT FIGURE 10 CIRCUIT
Inductor Current at Light Load Inductor Current at Light Load Buck Regulated Feedback V Buck Regulated Feedback oltage (Buck) Soft Start-Up Soft Start–Up vs T V emperature oltage vs Temperature
808 FORCED 806 RUN1,2 CONTINUOUS 5V/DIV MODE 804 TAGE (mV) V TAGE OUT2 802 BURST MODE 1V/DIV OPERATION VOL 800 2A/DIV VOUT1 PULSE 1V/DIV 798 SKIPPING MODE TED FEEDBACK VOL 796 4µs/DIV 7817 G07 1ms/DIV 7817 G08 794 V REGULA IN = 10V V VIN = 10V OUT = 5V 792 NO LOAD FIGURE 10 CIRCUIT –55 –25 5 35 65 95 125 155 FIGURE 10 CIRCUIT TEMPERATURE (oC) 7817 G09 Rev 0 For more information www.analog.com 7 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 Typical Application Related Parts