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LM3101M Scheda tecnica(PDF) 8 Page - National Semiconductor (TI) |
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LM3101M Scheda tecnica(HTML) 8 Page - National Semiconductor (TI) |
8 / 20 page Functional Description OscillatorSynchronization Section The operating frequency is set by a single resistor connect- ed from the RT pin (pin 1) to ground according to the equa- tion FO e 025(RT 20 pF) kHz X Inserting a 25 kX for RT sets the oscillator frequency at 500 kHz The oscillator is capable of synchronizing to an external source To synchronize the oscillator an external source is connected to the SYNC pin (pin 4) via a differentiator (see Figure 1 ) The external source delivers a pulse train to the differentiator which converts this signal into an AC-coupled signal The negative-edge of this signal applied to the SYNC pin will control the oscillator and thus set the operat- ing frequency The recommended values for RSYNC and CSYNC are as follows RSYNC e 1kX (typical) and CSYNC RSYNC l 1(8 FSYNC) F X kHz To synchronize to a 600 kHz external source and using a RSYNC of1kX the CSYNC must be CSYNC l 1(8 RSYNC FSYNC) e 1(8 1kX 600 kHz) e 208 pF 220 pF The oscillator frequency should range from 67% to 90% of the synchronization frequency In the above example the oscillator frequency can be between 400 kHz and 540 kHz TLH11436 – 6 FIGURE 1 Simplified Version of the Synchronization Circuit TLH11436 – 7 FIGURE 2 Simplified Version of the Short Circuit Frequency Shift Circuit 8 |
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