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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM2700MTX-ADJ датащи(PDF) 3 Page - National Semiconductor (TI) |
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LM2700MTX-ADJ датащи(HTML) 3 Page - National Semiconductor (TI) |
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3 / 17 page  Block Diagram 20012303 Detailed Description The LM2700 utilizes a PWM control scheme to regulate the output voltage over all load conditions. The operation can best be understood referring to the block diagram and Figure 1 of the Operation section. At the start of each cycle, the oscillator sets the driver logic and turns on the NMOS power device conducting current through the inductor, cycle 1 of Figure 1 (a). During this cycle, the voltage at the V C pin controls the peak inductor current. The V C voltage will in- crease with larger loads and decrease with smaller. This voltage is compared with the summation of the SW voltage and the ramp compensation. The ramp compensation is used in PWM architectures to eliminate the sub-harmonic oscillations that occur during duty cycles greater than 50%. Once the summation of the ramp compensation and switch voltage equals the V C voltage, the PWM comparator resets the driver logic turning off the NMOS power device. The inductor current then flows through the schottky diode to the load and output capacitor, cycle 2 of Figure 1 (b). The NMOS power device is then set by the oscillator at the end of the period and current flows through the inductor once again. The LM2700 has dedicated protection circuitry running dur- ing normal operation to protect the IC. The Thermal Shut- down circuitry turns off the NMOS power device when the die temperature reaches excessive levels. The UVP com- parator protects the NMOS power device during supply power startup and shutdown to prevent operation at voltages less than the minimum input voltage. The OVP comparator is used to prevent the output voltage from rising at no loads allowing full PWM operation over all load conditions. The LM2700 also features a shutdown mode decreasing the supply current to 5µA. www.national.com 3 |
Аналогичный номер детали - LM2700MTX-ADJ |
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Аналогичное описание - LM2700MTX-ADJ |
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