Datasheet LT3431 (Analog Devices) - 5
| 制造商 | Analog Devices |
| 描述 | High Voltage, 3A, 500kHz Step-Down Switching Regulator |
| 页数 / 页 | 28 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS. Minimum Input Voltage. Switching … |
| 文件格式/大小 | PDF / 263 Kb |
| 文件语言 | 英语 |
TYPICAL PERFOR A CE CHARACTERISTICS. Minimum Input Voltage. Switching Frequency. with 5V Output. BOOST Pin Current
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LT3431
W U TYPICAL PERFOR A CE CHARACTERISTICS Minimum Input Voltage Switching Frequency with 5V Output BOOST Pin Current
575 7.5 90 80 550 7.0 70 525 60 6.5 MINIMUM INPUT 50 500 VOLTAGE TO START 40 6.0 FREQUENCY (kHz) 475 30 INPUT VOLTAGE (V) BOOST PIN CURRENT (mA) 20 5.5 MINIMUM INPUT 450 VOLTAGE TO RUN 10 425 5.0 0 –50 –25 0 25 50 75 100 125 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 1 2 3 JUNCTION TEMPERATURE (°C) LOAD CURRENT (A) SWITCH CURRENT (A) 3431 G10 3431 G11 3431 G12
Switch Minimum ON Time VC Pin Shutdown Threshold Switch Voltage Drop vs Temperature
2.1 450 600 400 1.9 TJ = 125°C 500 350 1.7 300 400 TJ = 25°C 1.5 250 300 1.3 200 150 200 1.1 SWITCH VOLTAGE (mV) T THRESHOLD VOLTAGE (V) J = –40°C 100 0.9 SWITCH MINIMUM ON TIME (ns) 100 50 0.7 0 0 –50 –25 0 25 50 75 100 125 0 1 2 3 –50 –25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) SWITCH CURRENT (A) JUNCTION TEMPERATURE (°C) 3431 G13 3431 G14 3431 G15
Switch Peak Current Limit
6.00 5.50 5.00 4.50 4.00 3.50 SWITCH PEAK CURRENT LIMIT (A) 3.00 2.50 –50 –25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) 3431 G16 sn3431 3431fs 5
W U TYPICAL PERFOR A CE CHARACTERISTICS Minimum Input Voltage Switching Frequency with 5V Output BOOST Pin Current
575 7.5 90 80 550 7.0 70 525 60 6.5 MINIMUM INPUT 50 500 VOLTAGE TO START 40 6.0 FREQUENCY (kHz) 475 30 INPUT VOLTAGE (V) BOOST PIN CURRENT (mA) 20 5.5 MINIMUM INPUT 450 VOLTAGE TO RUN 10 425 5.0 0 –50 –25 0 25 50 75 100 125 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 1 2 3 JUNCTION TEMPERATURE (°C) LOAD CURRENT (A) SWITCH CURRENT (A) 3431 G10 3431 G11 3431 G12
Switch Minimum ON Time VC Pin Shutdown Threshold Switch Voltage Drop vs Temperature
2.1 450 600 400 1.9 TJ = 125°C 500 350 1.7 300 400 TJ = 25°C 1.5 250 300 1.3 200 150 200 1.1 SWITCH VOLTAGE (mV) T THRESHOLD VOLTAGE (V) J = –40°C 100 0.9 SWITCH MINIMUM ON TIME (ns) 100 50 0.7 0 0 –50 –25 0 25 50 75 100 125 0 1 2 3 –50 –25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) SWITCH CURRENT (A) JUNCTION TEMPERATURE (°C) 3431 G13 3431 G14 3431 G15
Switch Peak Current Limit
6.00 5.50 5.00 4.50 4.00 3.50 SWITCH PEAK CURRENT LIMIT (A) 3.00 2.50 –50 –25 0 25 50 75 100 125 JUNCTION TEMPERATURE (°C) 3431 G16 sn3431 3431fs 5