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LM2524DN Fiches technique(PDF) 8 Page - National Semiconductor (TI) |
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LM2524DN Fiches technique(HTML) 8 Page - National Semiconductor (TI) |
8 / 22 page Functional Description INTERNAL VOLTAGE REGULATOR The LM3524D has an on-chip 5V, 50 mA, short circuit pro- tected voltage regulator. This voltage regulator provides a supply for all internal circuitry of the device and can be used as an external reference. For input voltages of less than 8V the 5V output should be shorted to pin 15, V IN, which disables the 5V regulator. With these pins shorted the input voltage must be limited to a maximum of 6V. If input voltages of 6V–8V are to be used, a pre-regulator, as shown in Figure 1, must be added. OSCILLATOR The LM3524D provides a stable on-board oscillator. Its fre- quency is set by an external resistor, R T and capacitor, CT.A graph of R T,CT vs oscillator frequency is shown is Figure 2. The oscillator’s output provides the signals for triggering an internal flip-flop, which directs the PWM information to the outputs, and a blanking pulse to turn off both outputs during transitions to ensure that cross conduction does not occur. The width of the blanking pulse, or dead time, is controlled by the value of C T, as shown in Figure 3. The recommended values of R T are 1.8 k Ω to 100 kΩ, and for C T, 0.001 µF to 0.1 µF. If two or more LM3524D’s must be synchronized together, the easiest method is to interconnect all pin 3 terminals, tie all pin 7’s (together) to a single C T, and leave all pin 6’s open except one which is connected to a single R T. This method works well unless the LM3524D’s are more than 6" apart. A second synchronization method is appropriate for any circuit layout. One LM3524D, designated as master, must have its R TCT set for the correct period. The other slave LM3524D(s) should each have an R TCT set for a 10% longer period. All pin 3’s must then be interconnected to allow the master to properly reset the slave units. The oscillator may be synchronized to an external clock source by setting the internal free-running oscillator fre- quency 10% slower than the external clock and driving pin 3 with a pulse train (approx. 3V) from the clock. Pulse width should be greater than 50 ns to insure full synchronization. ERROR AMPLIFIER The error amplifier is a differential input, transconductance amplifier. Its gain, nominally 86 dB, is set by either feedback or output loading. This output loading can be done with either purely resistive or a combination of resistive and re- active components. A graph of the amplifier’s gain vs output load resistance is shown in Figure 4. 00865010 *Minimum CO of 10 µF required for stability. FIGURE 1. 00865005 FIGURE 2. 00865006 FIGURE 3. 00865007 FIGURE 4. www.national.com 8 |
Numéro de pièce similaire - LM2524DN |
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Description similaire - LM2524DN |
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