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LM3578A 数据表(PDF) 3 Page - Texas Instruments |
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LM3578A 数据表(HTML) 3 Page - Texas Instruments |
3 / 30 page LM2578A, LM3578A www.ti.com SNVS767E – AUGUST 2000 – REVISED APRIL 2013 Electrical Characteristics These specifications apply for 2V ≤ VIN ≤ 40V (2.2V ≤ VIN ≤ 40V for TJ ≤ −25°C), timing capacitor CT = 3900 pF, and 25% ≤ duty cycle ≤ 75%, unless otherwise specified. Values in standard typeface are for TJ = 25°C; values in boldface type apply for operation over the specified operating junction temperature range. Typical(1) LM2578A/ Symbol Parameter Conditions LM3578A Units Limit (2) OSCILLATOR fOSC Frequency 20 kHz 24 kHz (max) 16 kHz (min) ΔfOSC/ΔT Frequency Drift with Temperature −0.13 %/°C Amplitude 550 mVp-p REFERENCE/COMPARATOR(3) VR Input Reference I1 = I2 = 0 mA and 1.0 V Voltage I1 = I2 = 1 mA ±1% (4) 1.050/1.070 V (max) 0.950/0.930 V (min) ΔVR/ΔVIN Input Reference Voltage Line I1 = I2 = 0 mA and 0.003 %/V Regulation I1 = I2 = 1 mA ±1% (4) 0.01/0.02 %/V (max) IINV Inverting Input Current I1 = I2 = 0 mA, duty cycle = 25% 0.5 μA Level Shift Accuracy Level Shift Current = 1 mA 1.0 % 10/13 % (max) ΔVR/Δt Input Reference Voltage Long Term 100 ppm/1000h Stability OUTPUT VC (sat) Collector Saturation Voltage IC = 750 mA pulsed, Emitter 0.7 V grounded 0.90/1.2 V (max) VE (sat) Emitter Saturation Voltage IO = 80 mA pulsed, 1.4 V VIN = VC = 40V 1.7/2.0 V (max) ICES Collector Leakage Current VIN = VCE = 40V, Emitter grounded, 0.1 μA Output OFF 200/250 μA (max) BVCEO(SUS) Collector-Emitter Sustaining Voltage ISUST = 0.2A (pulsed), VIN = 0 60 V 50 V (min) CURRENT LIMIT VCL Sense Voltage Shutdown Level Referred to VIN or Ground 110 mV See (5) 80 mV (min) 160 mV (max) ΔVCL/ΔT Sense Voltage Temperature Drift 0.3 %/°C ICL Sense Bias Current Referred to VIN 4.0 μA Referred to ground 0.4 μA (1) Typical values are for TJ = 25°C and represent the most likely parametric norm. (2) All limits specified 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 specified via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to calculate AOQL. (3) 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. (4) I1 and I2 are the external sink currents at the inputs (refer to Test Circuit). (5) 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). Copyright © 2000–2013, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM2578A LM3578A |
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