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LT1737CS Datasheet(PDF) 3 Page - Linear Technology |
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LT1737CS Datasheet(HTML) 3 Page - Linear Technology |
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3 / 28 page  3 LT1737 1737f Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Component value range guaranteed by design. The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 14V, GATE open, VC = 1.4V unless otherwise noted. ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Current Amplifier VC Control Pin Threshold Duty Cycle = Min 0.90 1.12 1.25 V q 0.80 1.35 V VISENSE Switch Current Limit Duty Cycle ≤ 30% 220 250 270 mV Duty Cycle ≤ 30% q 200 280 mV Duty Cycle = 80% 220 mV ∆VISENSE/∆VC 0.30 mV Timing f Switching Frequency COSCAP = 100pF 90 100 115 kHz q 80 125 kHz COSCAP Oscillator Capacitor Value (Note 2) 33 200 pF tON Minimum Switch On Time RtON = 50k 200 ns tED Flyback Enable Delay Time RENDLY = 50k 200 ns tEN Minimum Flyback Enable Time RMENAB = 50k 200 ns Rt Timing Resistor Value (Note 2) 24 240 k Ω Maximum Switch Duty Cycle q 85 90 % Load Compensation Sense Offset Voltage 25 mV Current Gain Factor 0.80 0.95 1.05 mV UVLO Function VUVLO UVLO Pin Lockout Threshold q 1.21 1.25 1.29 V UVLO Pin Shutdown Threshold 0.75 V q 0.4 0.95 V IUVLO UVLO Pin Bias Current VUVLO = 1.2V – 0.25 + 0.1 + 0.25 µA VUVLO = 1.3V – 4.50 – 3.5 – 2.50 µA 3V Output Function VREF Reference Output Voltage ILOAD = 1mA q 2.8 3.0 3.2 V Output Impedance 10 Ω Current Limit q 815 mA |
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