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LT1171I Datasheet(PDF) 6 Page - Linear Technology |
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LT1171I Datasheet(HTML) 6 Page - Linear Technology |
6 / 20 page 6 LT1170/LT1171/LT1172 TEMPERATURE ( °C) 1170/1/2 G16 400 350 300 250 200 150 100 50 0 –75 –25 25 50 150 –50 0 75 100 125 – 400 – 350 – 300 – 250 – 200 – 150 –100 –50 0 CURRENT (OUT OF VC PIN) VOLTAGE VC VOLTAGE IS REDUCED UNTIL REGULATOR CURRENT DROPS BELOW 300 µA JUNCTION TEMPERATURE ( °C) –75 –25 25 50 150 1170/1/2 G17 –50 0 75 100 125 2.2 2.0 1.8 1.6 1.4 1.2 1.0 Isolated Mode Flyback Reference Voltage TEMPERATURE ( °C) 1170/1/2 G18 23 22 21 20 19 18 17 16 15 –75 –25 25 50 150 –50 0 75 100 125 RFB = 500Ω RFB = 1k RFB = 10k Normal/Flyback Mode Threshold on Feedback Pin TEMPERATURE ( °C) –50 500 490 480 470 460 450 440 430 420 410 400 0 50 75 1170/1/2 G20 –25 25 100 125 150 –24 –22 –20 –18 –16 –14 –12 –10 –8 –6 –4 FEEDBACK PIN CURRENT (AT THRESHOLD) FEEDBACK PIN VOLTAGE (AT THRESHOLD) Flyback Blanking Time Shutdown Thresholds Transconductance of Error Amplifier FREQUENCY (Hz) 1k 7000 6000 5000 4000 3000 2000 1000 0 –1000 10k 100k 1170/1/2 G19 1M 10M –30 0 30 60 90 120 150 180 210 θ gm TEMPERATURE ( °C) 11 10 9 8 7 6 5 4 3 2 1 1170/1/2 G13 –75 –25 25 50 150 –50 0 75 100 125 VSUPPLY = 60V VSUPPLY = 3V VC = 0.6V Feedback Pin Clamp Voltage Switch “Off” Characteristics Idle Supply Current vs Temperature FEEDBACK CURRENT (mA) 0 500 450 400 350 300 250 200 150 100 50 0 0.4 1170/1/2 G14 0.1 0.2 0.3 0.5 0.6 0.7 0.8 0.9 1.0 –55 °C 25 °C 150 °C SWITCH VOLTAGE (V) 0 1000 900 800 700 600 500 400 300 200 100 0 40 1170/1/2 G15 10 20 30 50 60 70 80 90 100 VSUPPLY = 55V VSUPPLY = 3V VSUPPLY = 15V VSUPPLY = 40V TYPICAL PERFOR A CE CHARACTERISTICS |
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