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LT3991EMSETRPBF Datasheet(PDF) 5 Page - Linear Technology |
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LT3991EMSETRPBF Datasheet(HTML) 5 Page - Linear Technology |
5 / 24 page LT3991 5 3991f TYPICAL PERFORMANCE CHARACTERISTICS Switch Current Limit Switch Current Limit Switch VCESAT Boost Pin Current Frequency Foldback Minimum Switch On-Time/ Switch Off-Time Load Regulation Switching Frequency TA = 25°C, unless otherwise noted. Soft-Start LOAD CURRENT (mA) 3991 G10 0.30 –0.25 –0.20 –0.15 –0.10 –0.05 0.20 0.15 0.10 0.05 0 0.25 –0.30 0 1200 600 800 1000 400 200 FRONT PAGE APPLICATION REFERENCED FROM VOUT AT 0.5A LOAD TEMPERATURE (°C) 3991 G11 1000 650 900 850 800 750 700 950 600 –55 155 35 65 125 95 5 –25 DUTY CYCLE (%) 3991 G12 3.0 2.0 1.5 1.0 0.5 2.5 0 0 100 60 80 40 20 TEMPERATURE (°C) 3991 G13 2.5 2.4 2.3 2.2 2.1 2.0 1.5 1.6 1.7 1.8 1.9 –55 –25 155 125 95 65 35 5 DUTY CYCLE = 30% SWITCH CURRENT (mA) 3991 G14 700 400 300 200 100 500 600 0 0 1500 500 750 1000 1250 250 SWITCH CURRENT (mA) 3991 G15 45 20 15 10 5 25 30 35 40 0 0 1500 500 750 1000 1250 250 FB PIN VOLTAGE (V) 0 900 800 400 200 500 600 700 300 100 0 0.8 0.4 3991 G16 1.2 0.6 0.2 1 TEMPERATURE (°C) –55 400 350 150 50 200 250 300 100 0 65 5 3991 G17 155 35 –25 95 125 tOFF(MIN) 1A LOAD tOFF(MIN) 0.5A LOAD tON(MIN) SS PIN VOLTAGE (V) 0 2.5 2.0 0.5 1.0 1.5 0 1.25 0.75 3991 G18 2 1 0.5 0.25 1.75 1.5 |
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