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LM78S4 Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM78S4 Datasheet(HTML) 3 Page - National Semiconductor (TI) |
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3 / 10 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. Storage Temperature Range Ceramic DIP −65˚C to +175˚C Molded DIP −65˚C to +150˚C Operating Temperature Range Extended (LM78S40J) −55˚C to +125˚C Industrial (LM78S40N) −40˚C to +125˚C Commercial (LM78S40CN) 0˚C to +70˚C Lead Temperature Ceramic DIP (Soldering, 60 sec.) 300˚C Molded DIP (Soldering, 10 sec.) 265˚C Internal Power Dissipation (Note 2) (Note 3) 16L-Ceramic DIP 1.50W 16L-Molded DIP 1.04W Input Voltage from V IN to GND 40V Input Voltage from V + (Op Amp) to GND 40V Common Mode Input Range (Comparator and Op Amp) −0.3 to V+ Differential Input Voltage (Note 4) ±30V Output Short Circuit Duration (Op Amp) Continuous Current from V REF 10 mA Voltage from Switch Collectors to GND 40V Voltage from Switch Emitters to GND 40V Voltage from Switch Collectors to Emitter 40V Voltage from Power Diode to GND 40V Reverse Power Diode Voltage 40V Current through Power Switch 1.5A Current through Power Diode 1.5A ESD Susceptibility (to be determined) LM78S40 Electrical Characteristics (Note 5) T A = Operating temperature range, VIN = 5.0V, V +(Op Amp) = 5.0V, unless otherwise specified. Symbol Parameter Conditions Min Typ Max Units GENERAL CHARACTERISTICS I CC Supply Current V IN = 5.0V 1.8 3.5 mA (Op Amp Disconnected) V IN = 40V 2.3 5.0 mA I CC Supply Current V IN = 5.0V 4.0 mA (Op Amp Connected) V IN = 40V 5.5 mA REFERENCE SECTION V REF Reference Voltage I REF = 1.0 mA Extend −55˚C < T A < +125˚C, Comm 0 < T A < +70˚C, 1.180 1.245 1.310 V Indus −40˚C < T A < +85˚C V R LINE Reference Voltage V IN = 3.0V to VIN = 40V, 0.04 0.2 mV/V Line Regulation I REF = 1.0 mA, TA = 25˚C V R LOAD Reference Voltage I REF = 1.0 mA to IREF = 10 mA, 0.2 0.5 mV/mA Load Regulation T A = 25˚C OSCILLATOR SECTION I CHG Charging Current V IN = 5.0V, TA = 25˚C 20 50 µA I CHG Charging Current V IN = 40V, TA = 25˚C 20 70 µA I DISCHG Discharge Current V IN = 5.0V, TA = 25˚C 150 250 µA I DISCHG Discharge Current V IN = 40V, TA = 25˚C 150 350 µA V OSC Oscillator Voltage Swing V IN = 5.0V, TA = 25˚C 0.5 V t on/toff Ratio of Charge/ 6.0 µs/µs Discharge Time CURRENT LIMIT SECTION V CLS Current Limit Sense Voltage T A = 25˚C 250 350 mV OUTPUT SWITCH SECTION V SAT 1 Output Saturation Voltage 1 I SW = 1.0A (Figure 1) 1.1 1.3 V V SAT 2 Output Saturation Voltage 2 I SW = 1.0A (Figure 2) 0.45 0.7 V 3 www.national.com |
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