Datasheet LT1425 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | Isolated Flyback Switching Regulators |
| Pages / Page | 20 / 4 — TYPICAL PERFORMANCE CHARACTERISTICS. Feedback Amplifier Output. Error … |
| File Format / Size | PDF / 302 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Feedback Amplifier Output. Error Amplifier Transconductance
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LT1425
W U TYPICAL PERFORMANCE CHARACTERISTICS Feedback Amplifier Output Error Amplifier Transconductance VC Pin Threshold and High Clamp Current vs RREF Pin Voltage vs Temperature (R Voltage vs Temperature REF Referred)
60 1400 2.50 µA) 25°C 40 125°C 1200 2.25 –55°C VC HIGH CLAMP 20 µmho) 1000 2.00 0 800 1.75 –20 600 1.50 PIN VOLTAGE (V) C –40 400 V 1.25 VC THRESHOLD TRANSCONDUCTANCE ( –60 200 1.00 FEEDBACK AMPLIFIER OUTPUT CURRENT ( –80 0 0.75 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 RREF NODE VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 1425 G04 1425 G05 1425 G06
Switching Frequency vs Minimum Synchronization SHDN Pin Input Current vs Temperature Voltage vs Temperature Voltage
300 ) 2.50 1 P-P TA = 25°C 295 2.25 µA) 0 290 2.00 –1 285 1.75 280 1.50 –2 275 1.25 SWITCHING FREQUENCY (kHz) –3 SHDN PIN INPUT CURRENT ( 270 1.00 265 MINIMUM SYNCHRONIZATION VOLTAGE (V 0.75 –4 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 TEMPERATURE (°C) TEMPERATURE (°C) SHDN PIN VOLTAGE (V) 1425 G07 1425 G08 1425 G09
Minimum Switch ON Time vs Flyback Enable Delay Time vs Minimum Flyback Enable Time vs Temperature Temperature Temperature
300 250 275 275 225 250 250 200 225 225 175 200 200 150 175 ENABLE TIME (ns) SWITCH ON TIME (ns) 175 125 150 ENABLE DELAY TIME (ns) 150 100 125 125 75 100 –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) 1425 G10 1425 G11 1425 G12 4
W U TYPICAL PERFORMANCE CHARACTERISTICS Feedback Amplifier Output Error Amplifier Transconductance VC Pin Threshold and High Clamp Current vs RREF Pin Voltage vs Temperature (R Voltage vs Temperature REF Referred)
60 1400 2.50 µA) 25°C 40 125°C 1200 2.25 –55°C VC HIGH CLAMP 20 µmho) 1000 2.00 0 800 1.75 –20 600 1.50 PIN VOLTAGE (V) C –40 400 V 1.25 VC THRESHOLD TRANSCONDUCTANCE ( –60 200 1.00 FEEDBACK AMPLIFIER OUTPUT CURRENT ( –80 0 0.75 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 RREF NODE VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 1425 G04 1425 G05 1425 G06
Switching Frequency vs Minimum Synchronization SHDN Pin Input Current vs Temperature Voltage vs Temperature Voltage
300 ) 2.50 1 P-P TA = 25°C 295 2.25 µA) 0 290 2.00 –1 285 1.75 280 1.50 –2 275 1.25 SWITCHING FREQUENCY (kHz) –3 SHDN PIN INPUT CURRENT ( 270 1.00 265 MINIMUM SYNCHRONIZATION VOLTAGE (V 0.75 –4 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 TEMPERATURE (°C) TEMPERATURE (°C) SHDN PIN VOLTAGE (V) 1425 G07 1425 G08 1425 G09
Minimum Switch ON Time vs Flyback Enable Delay Time vs Minimum Flyback Enable Time vs Temperature Temperature Temperature
300 250 275 275 225 250 250 200 225 225 175 200 200 150 175 ENABLE TIME (ns) SWITCH ON TIME (ns) 175 125 150 ENABLE DELAY TIME (ns) 150 100 125 125 75 100 –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) 1425 G10 1425 G11 1425 G12 4
