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LM2578AN Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM2578AN Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 20 page Electrical Characteristics (Continued) These specifications apply for 2V ≤ V IN ≤ 40V (2.2V ≤ V IN ≤ 40V for T J ≤ −25˚C), timing capacitor C T = 3900 pF, and 25% ≤ duty cycle ≤ 75%, unless otherwise specified. Values in standard typeface are for T J = 25˚C; values in boldface type apply for operation over the specified operating junction temperature range. LM2578A/ Symbol Parameter Conditions Typical LM3578A Units (Note 5) Limit (Note 6) CURRENT LIMIT ∆V CL/ ∆T Sense Voltage Temperature Drift 0.3 %/˚C I CL Sense Bias Current Referred to V IN 4.0 µA Referred to ground 0.4 µA DEVICE POWER CONSUMPTION I S Supply Current Output OFF, V E = 0V 2.0 mA 3.5/4.0 mA (max) Output ON, I C = 750 mA pulsed, 14 mA V E =0V Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating the device beyond its rated operating conditions. Note 2: For TJ ≥ 100˚C, the Emitter pin voltage should not be driven more than 0.6V below ground (see Application Information). Note 3: At elevated temperatures, devices must be derated based on package thermal resistance. The device in the 8-pin DIP must be derated at 95˚C/W, junction to ambient. The device in the surface-mount package must be derated at 150˚C/W, junction-to-ambient. Note 4: Human body model, 1.5 k Ω in series with 100 pF. Note 5: Typical values are for TJ = 25˚C and represent the most likely parametric norm. Note 6: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). Room temperature limits are 100% production tested. Limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate AOQL. Note 7: Input terminals are protected from accidental shorts to ground but if external voltages higher than the reference voltage are applied, excessive current will flow and should be limited to less than 5 mA. Note 8: I1 and I2 are the external sink currents at the inputs (refer to Test Circuit). Note 9: Connection of a 10 k Ω resistor from pin 1 to pin 4 will drive the duty cycle to its maximum, typically 90%. Applying the minimum Current Limit Sense Voltage to pin 7 will not reduce the duty cycle to less than 50%. Applying the maximum Current Limit Sense Voltage to pin 7 is certain to reduce the duty cycle below 50%. Increasing this voltage by 15 mV may be required to reduce the duty cycle to 0%, when the Collector output swing is 40V or greater (see Ground-Referred Current Limit Sense Voltage typical curve). Typical Performance Characteristics Oscillator Frequency Change with Temperature Oscillator Voltage Swing 00871132 00871133 www.national.com 4 |
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