Datasheet LTC7878 (Analog Devices) - 5
| 制造商 | Analog Devices |
| 描述 | 70V Parallelable 4-Switch Buck-Boost Controller with Inductor DCR Current Sensing |
| 页数 / 页 | 30 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| 文件格式/大小 | PDF / 2.4 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency and Power Loss vs
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LTC7878
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency and Power Loss vs Efficiency and Power Loss vs Efficiency and Power Loss vs Load Current (Buck Mode) Load Current (Buck-Boost Mode) Load Current (Boost Mode)
100 10 100 10 100 10 90 90 90 EFFICIENCY EFFICIENCY EFFICIENCY 80 8 80 8 80 8 70 POWER LOSS (W) 70 POWER LOSS (W) 70 POWER LOSS (W) 60 V V IN = 24V 6 60 6 60 IN = 8V 6 V V V OUT = 12V IN = 12V OUT = 12V 50 FIGURE 5 CIRCUIT 50 VOUT = 12V 50 FIGURE 5 CIRCUIT 40 FCM 4 FIGURE 5 CIRCUIT 40 4 40 FCM 4 EFFICIENCY (%) PULSE-SKIPPING EFFICIENCY (%) FCM EFFICIENCY (%) PULSE-SKIPPING 30 30 PULSE-SKIPPING 30 20 2 20 2 20 2 POWER LOSS 10 POWER LOSS 10 10 POWER LOSS 0 0 0 0 0 0 0.01 0.1 1 10 0.01 0.1 1 10 0.01 0.1 1 10 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 7878 G01 7878 G02 7878 G03
EXTVCC Bias Switch Over Voltage Current Sense Threshold vs Efficiency and Power Loss vs VIN with VIN = 24V, No Switching ITHB Voltage
100 10 3.0 250 99 EFFICIENCY 2.5 200 98 8 97 POWER LOSS (W) 150 2.0 96 6 100 95 1.5 94 4 CURRENT (mA) 50 POWER LOSS EFFICIENCY (%) V CC 1.0 93 EXT 0 92 2 VOUT = 12V 0.5 CURRENT SENSE THRESHOLD (mV) –50 91 IOUT = 9A MODE/ILIM = 0 FIGURE 5 CIRCUIT MODE/ILIM = INTVCC 90 0 0 –100 0 5 10 15 20 25 30 35 40 45 0 5 10 15 20 25 30 35 40 45 0 0.5 1 1.5 2 2.5 INPUT VOLTAGE (V) EXTVCC VOLTAGE (V) ITHB VOLTAGE (V) 7878 G04 7878 G05 7878 G06 Rev. C For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Efficiency and Power Loss vs Efficiency and Power Loss vs Efficiency and Power Loss vs Load Current (Buck Mode) Load Current (Buck-Boost Mode) Load Current (Boost Mode)
100 10 100 10 100 10 90 90 90 EFFICIENCY EFFICIENCY EFFICIENCY 80 8 80 8 80 8 70 POWER LOSS (W) 70 POWER LOSS (W) 70 POWER LOSS (W) 60 V V IN = 24V 6 60 6 60 IN = 8V 6 V V V OUT = 12V IN = 12V OUT = 12V 50 FIGURE 5 CIRCUIT 50 VOUT = 12V 50 FIGURE 5 CIRCUIT 40 FCM 4 FIGURE 5 CIRCUIT 40 4 40 FCM 4 EFFICIENCY (%) PULSE-SKIPPING EFFICIENCY (%) FCM EFFICIENCY (%) PULSE-SKIPPING 30 30 PULSE-SKIPPING 30 20 2 20 2 20 2 POWER LOSS 10 POWER LOSS 10 10 POWER LOSS 0 0 0 0 0 0 0.01 0.1 1 10 0.01 0.1 1 10 0.01 0.1 1 10 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 7878 G01 7878 G02 7878 G03
EXTVCC Bias Switch Over Voltage Current Sense Threshold vs Efficiency and Power Loss vs VIN with VIN = 24V, No Switching ITHB Voltage
100 10 3.0 250 99 EFFICIENCY 2.5 200 98 8 97 POWER LOSS (W) 150 2.0 96 6 100 95 1.5 94 4 CURRENT (mA) 50 POWER LOSS EFFICIENCY (%) V CC 1.0 93 EXT 0 92 2 VOUT = 12V 0.5 CURRENT SENSE THRESHOLD (mV) –50 91 IOUT = 9A MODE/ILIM = 0 FIGURE 5 CIRCUIT MODE/ILIM = INTVCC 90 0 0 –100 0 5 10 15 20 25 30 35 40 45 0 5 10 15 20 25 30 35 40 45 0 0.5 1 1.5 2 2.5 INPUT VOLTAGE (V) EXTVCC VOLTAGE (V) ITHB VOLTAGE (V) 7878 G04 7878 G05 7878 G06 Rev. C For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts