Datasheet LT3825 (Analog Devices) - 5
| 制造商 | Analog Devices |
| 描述 | Isolated No-Opto Synchronous Flyback Controller with Wide Input Supply Range |
| 页数 / 页 | 32 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Feedback Amplifier Output. Feedback … |
| 文件格式/大小 | PDF / 390 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Feedback Amplifier Output. Feedback Amplifier Source and. Feedback Amplifier gm
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LT3825
TYPICAL PERFORMANCE CHARACTERISTICS Feedback Amplifier Output Feedback Amplifier Source and Feedback Amplifier gm Current vs VFB Sink Current vs Temperature vs Temperature
70 70 1100 125°C SOURCE CURRENT 50 25°C VFB = 1.1V 65 –40°C 1050 30 SINK 60 CURRENT V 10 FB = 1.4V (µA) (µA) 55 1000 I VC (µmho) –10 I VC g m 50 –30 950 –50 45 –70 40 900 0.9 1 1.1 1.2 1.3 1.4 1.5 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 VFB (V) TEMPERATURE (°C) TEMPERATURE (°C) 3825 G10 3825 G11 3825 G12
Feedback Amplifier Voltage Gain vs Temperature UVLO vs Temperature IUVLO Hysteresis vs Temperature
1700 1.250 3.7 1650 1600 1.245 3.6 1550 3.5 1500 1.240 1450 3.4 (µA) (V/V) 1400 1.235 A V1350 UVLO (V) 3.3 I UVLO 1300 1.230 3.2 1250 1200 1.225 3.1 1150 1100 1.220 3.0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3825 G13 3825 G14 3825 G15
Soft-Start Charge Current PG, SG Rise and Fall Times VCC Clamp Voltage vs Temperature vs Load Capacitance vs Temperature
23 80 21.5 TA = 25°C ICC = 10mA 22 70 21.0 21 60 20 50 FALL TIME 20.5 19 40 (V) TIME (ns) V CC 18 30 20.0 RISE TIME 17 20 SFST CHARGE CURRENT (µA) 19.5 16 10 15 0 19.0 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 8 9 10 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) CAPACITANCE (nF) TEMPERATURE (°C) 3825 G16 3825 G17 3825 G18 3825fe 5 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Feedback Amplifier Output Feedback Amplifier Source and Feedback Amplifier gm Current vs VFB Sink Current vs Temperature vs Temperature
70 70 1100 125°C SOURCE CURRENT 50 25°C VFB = 1.1V 65 –40°C 1050 30 SINK 60 CURRENT V 10 FB = 1.4V (µA) (µA) 55 1000 I VC (µmho) –10 I VC g m 50 –30 950 –50 45 –70 40 900 0.9 1 1.1 1.2 1.3 1.4 1.5 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 VFB (V) TEMPERATURE (°C) TEMPERATURE (°C) 3825 G10 3825 G11 3825 G12
Feedback Amplifier Voltage Gain vs Temperature UVLO vs Temperature IUVLO Hysteresis vs Temperature
1700 1.250 3.7 1650 1600 1.245 3.6 1550 3.5 1500 1.240 1450 3.4 (µA) (V/V) 1400 1.235 A V1350 UVLO (V) 3.3 I UVLO 1300 1.230 3.2 1250 1200 1.225 3.1 1150 1100 1.220 3.0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3825 G13 3825 G14 3825 G15
Soft-Start Charge Current PG, SG Rise and Fall Times VCC Clamp Voltage vs Temperature vs Load Capacitance vs Temperature
23 80 21.5 TA = 25°C ICC = 10mA 22 70 21.0 21 60 20 50 FALL TIME 20.5 19 40 (V) TIME (ns) V CC 18 30 20.0 RISE TIME 17 20 SFST CHARGE CURRENT (µA) 19.5 16 10 15 0 19.0 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 6 7 8 9 10 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) CAPACITANCE (nF) TEMPERATURE (°C) 3825 G16 3825 G17 3825 G18 3825fe 5 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Related Parts