Datasheet LT3845A (Analog Devices) - 6
| 制造商 | Analog Devices |
| 描述 | High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency |
| 页数 / 页 | 26 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Operating Frequency. Error Amp … |
| 文件格式/大小 | PDF / 295 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Operating Frequency. Error Amp Reference. (SENSE + SENSE ) vs VSENSE(CM). vs Temperature
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LT3845A
TYPICAL PERFORMANCE CHARACTERISTICS Operating Frequency Error Amp Reference I + – (SENSE + SENSE ) vs VSENSE(CM) vs Temperature vs Temperature
800 308 1.234 TA = 25°C 306 600 1.233 304 1.232 (µA) 400 302 – ) 300 1.231 200 + + SENSE 298 1.230 0 296 I (SENSE 1.229 294 ERROR AMP REFERENCE (V) –200 OPERATING FREQUENCY (kHz) 1.228 292 –400 290 1.227 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 VSENSE(CM) (V) TEMPERATURE (°C) TEMPERATURE (°C) 3845A G10 3845A G11 3845A G12
Maximum Current Sense VIN UVLO Threshold (Rising) Threshold vs Temperature vs Temperature
106 4.54 4.52 104 4.50 102 4.48 100 4.46 98 4.44 UVLO THRESHOLD, RISING (V) 96 CURRENT SENSE THRESHOLD (mV) V IN 4.42 94 4.40 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) 3845A G13 3845A G14
Current Sense Threshold VIN UVLO Threshold (Falling) vs Duty Cycle vs Temperature
100 3.86 90 80 3.84 70 60 3.82 50 40 3.80 30 20 UVLO THRESHOLD, FALLING (V) 3.78 CURRENT SENSE THRESHOLD (mV) V IN 10 0 3.76 0 10 20 30 40 50 60 70 80 90 100 –50 –25 0 25 50 75 100 125 DUTY CYCLE (%) TEMPERATURE (°C) 3845A G16 3845A G15 3845afa 6 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Operating Frequency Error Amp Reference I + – (SENSE + SENSE ) vs VSENSE(CM) vs Temperature vs Temperature
800 308 1.234 TA = 25°C 306 600 1.233 304 1.232 (µA) 400 302 – ) 300 1.231 200 + + SENSE 298 1.230 0 296 I (SENSE 1.229 294 ERROR AMP REFERENCE (V) –200 OPERATING FREQUENCY (kHz) 1.228 292 –400 290 1.227 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 VSENSE(CM) (V) TEMPERATURE (°C) TEMPERATURE (°C) 3845A G10 3845A G11 3845A G12
Maximum Current Sense VIN UVLO Threshold (Rising) Threshold vs Temperature vs Temperature
106 4.54 4.52 104 4.50 102 4.48 100 4.46 98 4.44 UVLO THRESHOLD, RISING (V) 96 CURRENT SENSE THRESHOLD (mV) V IN 4.42 94 4.40 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) 3845A G13 3845A G14
Current Sense Threshold VIN UVLO Threshold (Falling) vs Duty Cycle vs Temperature
100 3.86 90 80 3.84 70 60 3.82 50 40 3.80 30 20 UVLO THRESHOLD, FALLING (V) 3.78 CURRENT SENSE THRESHOLD (mV) V IN 10 0 3.76 0 10 20 30 40 50 60 70 80 90 100 –50 –25 0 25 50 75 100 125 DUTY CYCLE (%) TEMPERATURE (°C) 3845A G16 3845A G15 3845afa 6 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts