Datasheet LT3740 (Analog Devices) - 4
| 制造商 | Analog Devices |
| 描述 | Wide Operating Range, Valley Mode, No RSENSE Synchronous Step-Down Controller |
| 页数 / 页 | 20 / 4 — TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C, unless otherwise noted). … |
| 文件格式/大小 | PDF / 244 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C, unless otherwise noted). Current Limit vs Bottom Gate. XREF Pin Start-Up
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LT3740
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C, unless otherwise noted) Current Limit vs Bottom Gate XREF Pin Start-Up Load Regulation On-Time
0 200 V SS IN = 10V V 180 0.5V/DIV –0.1 OUT = 2.5V RANGE = V R IN S = 12mΩ 160 IL –0.2 RANGE = OPEN 2A/DIV 140 –0.3 120 (%) RANGE = VIN –0.4 100 OUT RANGE = GND DV –0.5 80 RANGE = GND VO 2V/DIV 60 –0.6 CURRENT SENSING LIMIT (mV) 40 VIN = 10V, VOUT = 2.5V –0.7 RANGE = OPEN I 20 LOAD = 3A –0.8 0 3740 G04 2ms/DIV 0 2 4 6 8 10 30 40 50 60 70 80 90 100 LOAD CURRENT (A) BOTTOM GATE ON DUTY CYCLE (%) 3740 G05 3740 G06
Feedback Reference Voltage Shutdown vs Maximum VC VC vs Current Sensing Threshold vs Temperature
2.0 300 810 1.8 808 250 1.6 806 RANGE = VIN 1.4 804 200 (V) C 1.2 802 1.0 150 (mV) 800 RANGE = FBV 0.8 OPEN 798 MAXIMUM V 100 0.6 796 0.4 794 50 RANGE = GND 0.2 CURRENT SENSING THRESHOLD (mV) 792 0 0 790 0 0.5 1 1.5 2 2.5 3 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 –50 –25 0 25 50 75 100 SHUTDOWN (V) VC (V) TEMPERATURE (°C) 3740 G07 3740 G08 3740 G09a
Shutdown Threshold Switching Frequency PGOOD Threshold vs Temperature vs Temperature vs Temperature
770 1.2 320 1.1 315 760 1.0 310 750 0.9 305 (V) (mV) 740 0.8 300 FBV SHDN 0.7 295 730 0.6 290 720 CONTROLLER FREQUENCY (KHz) 0.5 285 710 0.4 280 –50 –25 0 25 50 75 100 –50 –25 0 25 50 75 100 –50 –25 0 25 50 75 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3740 G09b 3740 G10 3740 G11 3740fc 4
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C, unless otherwise noted) Current Limit vs Bottom Gate XREF Pin Start-Up Load Regulation On-Time
0 200 V SS IN = 10V V 180 0.5V/DIV –0.1 OUT = 2.5V RANGE = V R IN S = 12mΩ 160 IL –0.2 RANGE = OPEN 2A/DIV 140 –0.3 120 (%) RANGE = VIN –0.4 100 OUT RANGE = GND DV –0.5 80 RANGE = GND VO 2V/DIV 60 –0.6 CURRENT SENSING LIMIT (mV) 40 VIN = 10V, VOUT = 2.5V –0.7 RANGE = OPEN I 20 LOAD = 3A –0.8 0 3740 G04 2ms/DIV 0 2 4 6 8 10 30 40 50 60 70 80 90 100 LOAD CURRENT (A) BOTTOM GATE ON DUTY CYCLE (%) 3740 G05 3740 G06
Feedback Reference Voltage Shutdown vs Maximum VC VC vs Current Sensing Threshold vs Temperature
2.0 300 810 1.8 808 250 1.6 806 RANGE = VIN 1.4 804 200 (V) C 1.2 802 1.0 150 (mV) 800 RANGE = FBV 0.8 OPEN 798 MAXIMUM V 100 0.6 796 0.4 794 50 RANGE = GND 0.2 CURRENT SENSING THRESHOLD (mV) 792 0 0 790 0 0.5 1 1.5 2 2.5 3 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 –50 –25 0 25 50 75 100 SHUTDOWN (V) VC (V) TEMPERATURE (°C) 3740 G07 3740 G08 3740 G09a
Shutdown Threshold Switching Frequency PGOOD Threshold vs Temperature vs Temperature vs Temperature
770 1.2 320 1.1 315 760 1.0 310 750 0.9 305 (V) (mV) 740 0.8 300 FBV SHDN 0.7 295 730 0.6 290 720 CONTROLLER FREQUENCY (KHz) 0.5 285 710 0.4 280 –50 –25 0 25 50 75 100 –50 –25 0 25 50 75 100 –50 –25 0 25 50 75 100 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3740 G09b 3740 G10 3740 G11 3740fc 4