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LT1072CK Datasheet(PDF) 5 Page - Linear Technology |
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LT1072CK Datasheet(HTML) 5 Page - Linear Technology |
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5 / 16 page  5 LT1072 1072fc Driver Current* vs Switch Current Supply Current vs Input Voltage* Supply Current vs Supply Voltage (Shutdown Mode) Normal/Flyback Mode Threshold on Feedback Pin Shutdown Mode Supply Current Error Amplifier Transconductance Shutdown Thresholds Idle Supply Current vs Temperature Feedback Pin Clamp Voltage SWITCH CURRENT (A) 0 *AVERAGE LT1072 POWER SUPPLY CURRENT IS FOUND BY MULTIPLYING DRIVER CURRENT BY DUTY CYCLE, THEN ADDING QUIESCENT CURRENT 80 70 60 50 40 30 20 10 0 1.6 LT1072 • TPC10 0.4 0.8 1.2 2 1.4 0.2 0.6 1 1.8 *UNDER VERY LOW OUTPUT CURRENT CONDITIONS, DUTY CYCLE FOR MOST CIRCUITS WILL APPROACH 10% OR LESS INPUT VOLTAGE (V) 0 5 7 9 11 10 20 30 40 LT1072 • TPC11 50 13 15 6 8 10 12 14 60 TJ = 25°C NOTE THAT THIS CURRENT DOES NOT INCLUDE DRIVER CURRENT, WHICH IS A FUNCTION OF LOAD CURRENT AND DUTY CYCLE. 90% DUTY CYCLE 50% DUTY CYCLE 10% DUTY CYCLE 0% DUTY CYCLE SUPPLY VOLTAGE (V) 0 60 80 100 30 50 LT1072 • TPC12 40 20 0 10 20 40 120 140 160 60 TJ = 25°C VC = 50mV VC = 0V TEMPERATURE (°C) –50 400 410 430 440 450 500 470 0 50 75 LT1072 • TPC13 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) VC PIN VOLTAGE (mV) 0 120 160 200 80 LT1072 • TPC14 80 40 100 140 180 60 20 0 20 10 40 30 60 70 90 50 100 TJ = 150°C –55°C ≤ TJ ≤ 125°C TEMPERATURE (C°) –75 0 500 1500 2000 2500 5000 3500 –25 25 50 150 LT1072 • TPC15 1000 4000 4500 3000 –50 0 75 100 125 Gm = ∆ I ∆V (VC PIN) (FB PIN) TEMPERATURE (°C) –75 200 250 300 125 LT1072 • TPC16 150 100 0 –25 25 75 –50 150 050 100 50 400 350 –200 –250 –300 –150 –100 0 –50 –400 –350 CURRENT (OUT OF VC PIN) VOLTAGE VC VOLTAGE IS REDUCED UNTIL REGULATOR CURRENT DROPS BELOW 300µA TEMPERATURE (°C) –75 1 2 4 5 6 11 8 –25 25 50 150 LT1072 • TPC17 3 9 10 7 –50 0 75 100 125 VC = 0.6V VSUPPLY = 60V VSUPPLY = 3V FEEDBACK CURRENT (mA) 0 300 400 500 0.8 LT1072 • TPC18 200 100 250 350 450 150 50 0 0.2 0.1 0.4 0.3 0.6 0.7 0.9 0.5 1 –55°C 25°C 150°C TYPICAL PERFOR A CE CHARACTERISTICS |
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