Datasheet LT3837 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Isolated No-Opto Synchronous Flyback Controller |
| Pages / Page | 28 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS. Feedback Amplifier Source and. … |
| File Format / Size | PDF / 324 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Feedback Amplifier Source and. Feedback Amplifier gm. Feedback Amplifier Voltage Gain
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LT3837
TYPICAL PERFORMANCE CHARACTERISTICS Feedback Amplifier Source and Feedback Amplifier gm Feedback Amplifier Voltage Gain Sink Current vs Temperature vs Temperature vs Temperature
70 1100 1700 SOURCE CURRENT 1650 VFB = 1.1V 65 1600 SINK 1050 1550 60 CURRENT 1500 VFB = 1.4V 1450 (µA) 55 1000 1400 (µmho) (V/V) I VC g m A V 1350 50 1300 950 1250 45 1200 1150 40 900 1100 –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) 3837 G10 3837 G11 3837 G12
UVLO Shutdown Threshold UVLO vs Temperature IUVLO Hysteresis vs Temperature vs Temperature
1.250 3.7 0.90 0.85 1.245 3.6 0.80 3.5 0.75 VCC = 14V 1.240 0.70 3.4 (µA) (µA) 1.235 0.65 UVLO (V) 3.3 I UVLO V UVLO 0.60 1.230 3.2 0.55 0.50 1.225 3.1 0.45 1.220 3.0 0.40 –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) 3837 G13 3837 G14 3837 G15
Soft-Start Charge Current PG, SG Rise and Fall Times Minimum On-Time vs Temperature vs Load Capacitance vs Temperature
24 80 21.5 TA = 25°C ICC = 10mA 23 70 21.0 22 60 21 50 FALL TIME 20.5 20 40 (V) TIME (ns) V CC 19 30 20.0 RISE TIME 18 20 SFST CHARGE CURRENT (µA) 19.5 17 10 16 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) 3837 G16 3837 G17 3837 G18 3837fd 5 Document Outline features applications description Typical Application absolute maximum ratings Pin Configuration order information electrical characteristics typical performance characteristics pin functions block diagram flyback feedback amplifier timing diagram operation applications information typical application Package description Revision History related parts
TYPICAL PERFORMANCE CHARACTERISTICS Feedback Amplifier Source and Feedback Amplifier gm Feedback Amplifier Voltage Gain Sink Current vs Temperature vs Temperature vs Temperature
70 1100 1700 SOURCE CURRENT 1650 VFB = 1.1V 65 1600 SINK 1050 1550 60 CURRENT 1500 VFB = 1.4V 1450 (µA) 55 1000 1400 (µmho) (V/V) I VC g m A V 1350 50 1300 950 1250 45 1200 1150 40 900 1100 –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) 3837 G10 3837 G11 3837 G12
UVLO Shutdown Threshold UVLO vs Temperature IUVLO Hysteresis vs Temperature vs Temperature
1.250 3.7 0.90 0.85 1.245 3.6 0.80 3.5 0.75 VCC = 14V 1.240 0.70 3.4 (µA) (µA) 1.235 0.65 UVLO (V) 3.3 I UVLO V UVLO 0.60 1.230 3.2 0.55 0.50 1.225 3.1 0.45 1.220 3.0 0.40 –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) 3837 G13 3837 G14 3837 G15
Soft-Start Charge Current PG, SG Rise and Fall Times Minimum On-Time vs Temperature vs Load Capacitance vs Temperature
24 80 21.5 TA = 25°C ICC = 10mA 23 70 21.0 22 60 21 50 FALL TIME 20.5 20 40 (V) TIME (ns) V CC 19 30 20.0 RISE TIME 18 20 SFST CHARGE CURRENT (µA) 19.5 17 10 16 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) 3837 G16 3837 G17 3837 G18 3837fd 5 Document Outline features applications description Typical Application absolute maximum ratings Pin Configuration order information electrical characteristics typical performance characteristics pin functions block diagram flyback feedback amplifier timing diagram operation applications information typical application Package description Revision History related parts
