Datasheet LT1725 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | General Purpose Isolated Flyback Controller |
| Pages / Page | 28 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS. Minimum Switch-On Time vs. Minimum … |
| File Format / Size | PDF / 265 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS. Minimum Switch-On Time vs. Minimum Enable Time vs. Enable Delay Time vs. Temperature
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LT1725
W U TYPICAL PERFOR A CE CHARACTERISTICS Minimum Switch-On Time vs Minimum Enable Time vs Enable Delay Time vs Temperature Temperature Temperature
275 275 275 RTON = 50k RMINENAB = 50k 250 250 250 225 225 225 200 200 200 175 175 175 ENABLE DELAY TIME (ns) MINIMUM ENABLE TIME (ns) MINIMUM SWITCH-ON TIME (ns) 150 150 150 125 125 125 –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) 1725 G10 1725 G11 1725 G12
Feedback Amplifier Output Current Feedback Amplifier vs FB Pin Voltage Transconductance vs Temperature
80 1600 µA) µmho) 60 1400 40 T 1200 A = –55°C T 20 A = 25°C 1000 0 800 –20 TA = 125°C 600 –40 –60 400 FEEDBACK AMPLIFIER OUTPUT CURRENT ( –80 200 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 FEEDBACK AMPLIFIER TRANSCONDUCTANCE ( –50 –25 0 25 50 75 100 125 FB PIN VOLTAGE (V) TEMPERATURE (°C) 1725 G13 1725 G14
Soft-Start Charging Current vs Soft-Start Sink Current vs Temperature Temperature
60 2.5 V(SFST) = 0V V(SFST) = 1.5V µA) 50 2.0 40 1.5 30 1.0 20 0.5 10 SOFT-START SINK CURRENT (mA) SOFT-START CHARGING CURRENT ( 0 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) 1725 G15 1725 G16 1725fa 5
W U TYPICAL PERFOR A CE CHARACTERISTICS Minimum Switch-On Time vs Minimum Enable Time vs Enable Delay Time vs Temperature Temperature Temperature
275 275 275 RTON = 50k RMINENAB = 50k 250 250 250 225 225 225 200 200 200 175 175 175 ENABLE DELAY TIME (ns) MINIMUM ENABLE TIME (ns) MINIMUM SWITCH-ON TIME (ns) 150 150 150 125 125 125 –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) 1725 G10 1725 G11 1725 G12
Feedback Amplifier Output Current Feedback Amplifier vs FB Pin Voltage Transconductance vs Temperature
80 1600 µA) µmho) 60 1400 40 T 1200 A = –55°C T 20 A = 25°C 1000 0 800 –20 TA = 125°C 600 –40 –60 400 FEEDBACK AMPLIFIER OUTPUT CURRENT ( –80 200 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 FEEDBACK AMPLIFIER TRANSCONDUCTANCE ( –50 –25 0 25 50 75 100 125 FB PIN VOLTAGE (V) TEMPERATURE (°C) 1725 G13 1725 G14
Soft-Start Charging Current vs Soft-Start Sink Current vs Temperature Temperature
60 2.5 V(SFST) = 0V V(SFST) = 1.5V µA) 50 2.0 40 1.5 30 1.0 20 0.5 10 SOFT-START SINK CURRENT (mA) SOFT-START CHARGING CURRENT ( 0 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) 1725 G15 1725 G16 1725fa 5
