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LT1071HVCT Datasheet(PDF) 5 Page - Linear Technology |
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LT1071HVCT Datasheet(HTML) 5 Page - Linear Technology |
5 / 12 page 5 LT1070/LT1071 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage (Shutdown Mode) Driver Current* vs Switch Current SWITCH CURRENT (A) 0 160 140 120 100 80 60 40 20 0 4 1070/71 G10 1 * 23 5 TJ ≥ 25°C AVERAGE LT1070 POWER SUPPLY CURRENT IS FOUND BY MULTIPLYING DRIVER CURRENT BY DUTY CYCLE, THEN ADDING QUIESCENT CURRENT TJ = –55°C SUPPLY VOLTAGE (V) 0 60 80 100 30 50 1070/71 G12 40 20 0 10 20 40 120 140 160 60 TJ = 25°C VC = 50mV VC = 0V Supply Current vs Input Voltage* INPUT VOLTAGE (V) 0 6 8 10 12 10 20 30 * 40 1070/71 G11 50 14 UNDER VERY LOW OUTPUT CURRENT CONDITIONS, DUTY CYCLE FOR MOST CIRCUITS WILL APPROACH 10% OR LESS 16 7 9 11 13 15 60 TJ = 25°C ISWITCH ≤ 10mA 90% DUTY CYCLE 50% DUTY CYCLE 0% DUTY CYCLE 10% DUTY CYCLE Feedback Pin Clamp Voltage Shutdown Thresholds TEMPERATURE ( °C) –75 300 250 200 150 100 50 0 125 1070/71 G16 –25 25 75 – 50 150 0 50 100 400 350 –300 –250 –200 –150 –100 –50 0 – 400 –350 VC VOLTAGE IS REDUCED UNTIL REGULATOR CURRENT DROPS BELOW 300 µA VOLTAGE CURRENT (OUT OF VC PIN) FEEDBACK CURRENT (mA) 0 300 400 500 0.8 1070/71 G18 200 100 250 350 450 150 50 0 0.2 0.4 0.6 0.1 0.9 0.3 0.5 0.7 1.0 –55 °C 25 °C 150 °C TEMPERATURE ( °C) –75 7 9 11 125 1070/71 G14 5 3 6 8 10 4 2 1 –25 25 75 – 50 150 0 50 100 VC = 0.6V VSUPPLY = 60V VSUPPLY = 3V Idle Supply Current vs Temperature Normal/Flyback Mode Threshold on Feedback Pin TEMPERATURE ( °C) –50 400 410 430 440 450 500 470 0 50 75 1070/71 G13 420 480 490 460 –4 –6 –10 –12 –14 –24 –18 –8 –20 –22 –16 –25 25 100 125 150 FEEDBACK PIN VOLTAGE (AT THRESHOLD) FEEDBACK PIN CURRENT (AT THRESHOLD) Error Amplifier Transconductance TEMPERATURE ( °C) –75 3000 4000 5000 125 1070/71 G14 2000 1000 2500 3500 4500 1500 500 0 –25 25 75 – 50 150 0 50 100 gm = (VC PIN) (FB PIN) ∆I ∆V Shutdown Mode Supply Current VC PIN VOLTAGE (mV) 0 120 160 200 80 1070/71 G14 80 40 100 140 180 60 20 0 20 40 60 10 90 30 50 70 100 TJ = 150°C –55 °C ≤ TJ ≤ 125°C |
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