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LM2578A Datasheet(PDF) 2 Page - National Semiconductor (TI) |
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LM2578A Datasheet(HTML) 2 Page - National Semiconductor (TI) |
2 / 18 page Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Total Supply Voltage 50V Collector Output to Ground −0.3V to +50V Emitter Output to Ground (Note 2) −1V to +50V Power Dissipation (Note 3) Internally limited Output Current 750 mA Storage Temperature −65˚C to +150˚C Lead Temperature (soldering, 10 seconds) 260˚C Maximum Junction Temperature 150˚C ESD Tolerance (Note 4) 2 kV Operating Ratings Ambient Temperature Range LM1578A −55˚C ≤ T A ≤+125˚C LM2578A −40˚C ≤ T A ≤+85˚C LM3578A 0˚C ≤ T A ≤+70˚C Junction Temperature Range LM1578A −55˚C ≤ T J ≤+150˚C LM2578A −40˚C ≤ T J ≤+125˚C LM3578A 0˚C ≤ T J ≤+125˚C Electrical Characteristics These specifications apply for 2V ≤ V IN ≤ 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 T J = 25˚C; values in boldface type apply for operation over the specified operating junction temperature range. LM1578A LM2578A/ Symbol Parameter Conditions Typical Limit LM3578A Units (Note 5) (Note 6) (Note 11) Limit (Note 7) OSCILLATOR f OSC Frequency 20 kHz 22.4 24 kHz (max) 17.6 16 kHz (min) ∆f OSC/∆T Frequency Drift with −0.13 %/˚C Temperature Amplitude 550 mV p-p REFERENCE/COMPARATOR (Note 8) V R Input Reference I 1 = I2 = 0 mA and 1.0 V Voltage I 1 = I2 = 1mA ±1% (Note 9) 1.035/1.050 1.050/1.070 V (max) 0.965/0.950 0.950/0.930 V (min) ∆V R/∆VIN Input Reference Volt- I 1 = I2 = 0 mA and 0.003 %/V age Line Regulation I 1 = I2 = 1mA ±1% (Note 9) 0.01/0.02 0.01/0.02 %/V (max) I INV Inverting Input I 1 = I2 = 0 mA, duty cycle = 25% 0.5 µA Current Level Shift Accuracy Level Shift Current = 1 mA 1.0 % 5/8 10/13 % (max) ∆V R/∆t Input Reference 100 ppm/1000h Voltage Long Term Stability OUTPUT V C (sat) Collector Saturation I C = 750 mA pulsed, Emitter 0.7 V Voltage grounded 0.85/1.2 0.90/1.2 V (max) V E (sat) Emitter Saturation I O = 80 mA pulsed, 1.4 V Voltage V IN = VC = 40V 1.6/2.1 1.7/2.0 V (max) I CES Collector Leakage V IN = VCE = 40V, Emitter 0.1 µA Current grounded, Output OFF 50/100 200/250 µA (max) BV CEO(SUS) Collector-Emitter I SUST = 0.2A (pulsed), VIN = 060 V Sustaining Voltage 50 50 V (min) www.national.com 2 |
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