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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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LM2578A Datenblatt(PDF) 6 Page - National Semiconductor (TI) |
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LM2578A Datenblatt(HTML) 6 Page - National Semiconductor (TI) |
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6 / 20 page  Typical Performance Characteristics (Continued) Current Limit Sense Voltage vs Supply Voltage Supply Current 00871140 00871141 Supply Current Collector Current with Emitter Output Below Ground 00871142 00871143 Test Circuit* Parameter tests can be made using the test circuit shown. Select the desired V in, collector voltage and duty cycle with adjustable power supplies. A digital volt meter with an input resistance greater than 100 M Ω should be used to measure the following: Input Reference Voltage to Ground; S1 in either position. Level Shift Accuracy (%) = (T P3(V)/1V) x 100%; S1 at I1 =I2 =1mA Input Current (mA) = (1V − T p3 (V))/1 M Ω:S1atI 1 =I2 = 0 mA. Oscillator parameters can be measured at T p4 using a fre- quency counter or an oscilloscope. The Current Limit Sense Voltage is measured by connecting an adjustable 0-to-1V floating power supply in series with the current limit terminal and referring it to either the ground or the V in terminal. Set the duty cycle to 90% and monitor test point T P5 while adjusting the floating power supply voltage until the LM2578A’s duty cycle just reaches 0%. This voltage is the Current Limit Sense Voltage. The Supply Current should be measured with the duty cycle at 0% and S1 in the I 1 =I2 = 0 mA position. *LM2578A specifications are measured using automated test equipment. This circuit is provided for the customer’s convenience when checking parameters. Due to possible variations in testing conditions, the measured values from these testing procedures may not match those of the factory. www.national.com 6 |
Ähnliche Teilenummer - LM2578A |
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Ähnliche Beschreibung - LM2578A |
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