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LT1578C Datasheet(PDF) 4 Page - Linear Technology |
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LT1578C Datasheet(HTML) 4 Page - Linear Technology |
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4 / 28 page  4 LT1578/LT1578-2.5 TYPICAL PERFORMANCE CHARACTERISTICS JUNCTION TEMPERATURE ( °C) –50 4 3 2 1 0 100 1576 G04 –25 0 25 50 75 125 AT 2.44V STANDBY THRESHOLD (CURRENT FLOWS OUT OF PIN) Shutdown Pin Bias Current (VSHDN = Lockout Threshold) JUNCTION TEMPERATURE ( °C) –50 180 160 140 120 100 80 60 40 20 0 100 1576 G05 –25 0 25 50 75 125 CURRENT REQUIRED TO FORCE SHUTDOWN (FLOWS OUT OF PIN). AFTER SHUTDOWN, CURRENT DROPS TO A FEW µA JUNCTION TEMPERATURE ( °C) –50 100 1576 G06 050 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 –25 25 75 125 START-UP SHUTDOWN Shutdown Supply Current INPUT VOLTAGE (V) 0 25 20 15 10 5 0 1576 G08 5 10 15 VSHDN = 0V FREQUENCY (Hz) 2000 1500 1000 500 0 –500 200 150 100 50 0 –50 10 1k 10k 1M 1576 G09 100 100k GAIN PHASE ERROR AMPLIFIER EQUIVALENT CIRCUIT ROUT 570k COUT 2.4pF VC RLOAD = 50Ω VFB 1 × 10 –3 ) ( Error Amplifier Transconductance JUNCTION TEMPERATURE ( °C) –50 2.46 2.45 2.44 2.43 2.42 2.41 2.40 25 75 1576 G07 –25 0 50 100 125 ON STANDBY FEEDBACK VOLTAGE (V) 0 2.0 1576 G12 0.5 1.0 1.5 250 200 150 100 50 0 FEEDBACK PIN CURRENT SWITCHING FREQUENCY Shutdown Supply Current JUNCTION TEMPERATURE ( °C) –50 100 1576 G11 050 1600 1400 1200 1000 800 600 400 200 0 –25 25 75 125 Error Amplifier Transconductance Frequency Foldback Shutdown Thresholds Standby Thresholds SHUTDOWN VOLTAGE (V) 0 30 25 20 15 10 5 0 1576 G010 0.1 0.2 0.3 0.4 VIN = 10V Shutdown Pin Bias Current (VSHDN = Shutdown Threshold) |
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