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LT1241 Datasheet(PDF) 3 Page - Linear Technology |
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LT1241 Datasheet(HTML) 3 Page - Linear Technology |
3 / 16 page 3 LT1241 Series PARAMETER CONDITIONS MIN TYP MAX UNITS Error Amplifier Section Output Voltage High Level VPIN2 = 2.3V, RL = 15k to GND q 5 5.6 V Output Voltage Low Level VPIN2 = 2.7V, RL = 15k to Pin 8 q 0.2 1.1 V Current Sense Section Gain q 2.85 3.00 3.15 V/V Maximum Current Sense Input Threshold VPIN3 < 1.1V q 0.90 1.00 1.10 V Power Supply Rejection Ratio q 70 dB Input Bias Current q –1 10 µA Delay to Output q 50 100 ns Blanking Time 100 ns Blanking Override Voltage 1.5 V Output Section Output Low Level IOUT = 20mA q 0.25 0.4 V IOUT = 200mA q 0.75 2.2 V Output High Level IOUT = 20mA q 12.0 V IOUT = 200mA q 11.75 V Rise Time CL = 1nF, TJ = 25°C50 80 ns Fall Time CL = 1.0nF, TJ = 25°C30 60 ns Output Clamp Voltage IO = 1mA q 18 19.5 V Undervoltage Lockout Start-Up Threshold LT1241 q 9.0 9.6 10.2 V LT1242/LT1244 q 15 16 17 V LT1243/LT1245 q 7.8 8.4 9.0 V Minimum Operating Voltage LT1241/LT1243/LT1245 q 7.0 7.6 8.2 V LT1242/LT1244 q 9.0 10 11 V Hysteresis LT1241 1.6 2.0 V LT1242/LT1244 5.5 6.0 V LT1243/LT1245 0.4 0.8 V PWM Maximum Duty Cycle LT1241/LT1244/LT1245 TJ = 25°C46 48 % LT1242/LT1243 TJ = 25°C94 96 % Minimum Duty Cycle q 0% Total Device Start-Up Current q 170 250 µA Operating Current q 710 mA The q denotes those specifications which apply over the full operating temperature range. Note 1: Unless otherwise specified, VCC = 15V, RT = 10k, CT = 3.3nF. (Notes 1, 2) ELECTRICAL C C HARA TERISTICS Note 2: Low duty cycle pulse techniques are used during test to maintain junction temperature close to ambient. |
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