Datasheet LT3957A (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Boost, Flyback, SEPIC and Inverting Converter with 5A, 40V Switch |
| Pages / Page | 28 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS TA ≈ TJ = 25°C, unless otherwise … |
| File Format / Size | PDF / 567 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA ≈ TJ = 25°C, unless otherwise noted. Dynamic Quiescent Current. Normalized Switching
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LT3957A
TYPICAL PERFORMANCE CHARACTERISTICS TA ≈ TJ = 25°C, unless otherwise noted. Dynamic Quiescent Current Normalized Switching vs Switching Frequency RT vs Switching Frequency Frequency vs FBX
12 1000 120 10 100 8 80 (mA) 6 (kΩ) 100 60 I Q T R 4 40 2 NORMALIZED FREQUENCY (%) 20 0 10 0 100 200 300 400 500 600 700 800 900 1000 0 100 200 300 400 500 600 700 800 900 1000 –0.8 –0.4 0 0.4 0.8 1.2 1.6 SWITCHING FREQUENCY (kHz) SWITCHING FREQUENCY (kHz) FBX VOLTAGE (V) 3957A G04 3957A G05 3957A G06
Switching Frequency SW Pin Current Limit SW Pin Current Limit vs Temperature vs Temperature vs Duty Cycle
325 6.6 6.6 RT = 41.2k 320 6.4 6.4 315 310 6.2 6.2 305 300 6.0 6.0 295 5.8 5.8 290 SW PIN CURRENT LIMIT (A) SW PIN CURRENT LIMIT (A) SWITCHING FREQUENCY (kHz) 285 5.6 5.6 280 275 5.4 5.4 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) DUTY CYCLE (%) 3957A G09 3957A G07 3957A G08
EN/UVLO Threshold EN/UVLO Hysteresis Current vs Temperature EN/UVLO Current vs Voltage vs Temperature
1.28 40 2.4 1.26 30 2.2 EN/UVLO RISING 1.24 (μA) 20 2.0 1.22 EN/UVLO FALLING I EN/UVLO EN/UVLO VOLTAGE (V) EN/UVLO CURRENT (μA) 10 1.8 1.20 1.18 0 1.6 –50 –25 0 25 50 75 100 125 0 10 20 30 40 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) EN/UVLO VOLTAGE (V) TEMPERATURE (°C) 3957A G10 3957A G11 3957A G12 3957afa 5
TYPICAL PERFORMANCE CHARACTERISTICS TA ≈ TJ = 25°C, unless otherwise noted. Dynamic Quiescent Current Normalized Switching vs Switching Frequency RT vs Switching Frequency Frequency vs FBX
12 1000 120 10 100 8 80 (mA) 6 (kΩ) 100 60 I Q T R 4 40 2 NORMALIZED FREQUENCY (%) 20 0 10 0 100 200 300 400 500 600 700 800 900 1000 0 100 200 300 400 500 600 700 800 900 1000 –0.8 –0.4 0 0.4 0.8 1.2 1.6 SWITCHING FREQUENCY (kHz) SWITCHING FREQUENCY (kHz) FBX VOLTAGE (V) 3957A G04 3957A G05 3957A G06
Switching Frequency SW Pin Current Limit SW Pin Current Limit vs Temperature vs Temperature vs Duty Cycle
325 6.6 6.6 RT = 41.2k 320 6.4 6.4 315 310 6.2 6.2 305 300 6.0 6.0 295 5.8 5.8 290 SW PIN CURRENT LIMIT (A) SW PIN CURRENT LIMIT (A) SWITCHING FREQUENCY (kHz) 285 5.6 5.6 280 275 5.4 5.4 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 20 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) DUTY CYCLE (%) 3957A G09 3957A G07 3957A G08
EN/UVLO Threshold EN/UVLO Hysteresis Current vs Temperature EN/UVLO Current vs Voltage vs Temperature
1.28 40 2.4 1.26 30 2.2 EN/UVLO RISING 1.24 (μA) 20 2.0 1.22 EN/UVLO FALLING I EN/UVLO EN/UVLO VOLTAGE (V) EN/UVLO CURRENT (μA) 10 1.8 1.20 1.18 0 1.6 –50 –25 0 25 50 75 100 125 0 10 20 30 40 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) EN/UVLO VOLTAGE (V) TEMPERATURE (°C) 3957A G10 3957A G11 3957A G12 3957afa 5
