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UC3626 датащи(PDF) 9 Page - Texas Instruments |
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UC3626 датащи(HTML) 9 Page - Texas Instruments |
9 / 23 page UCC2626, UCC3626 SLUS318B – APRIL 1999 – REVISED JANUARY 2002 9 www.ti.com APPLICATION INFORMATION configuring the oscillator The UCC3626 oscillator is designed to operate at frequencies up to 250 kHz and provide a triangle waveform on CT with a peak-to-peak amplitude of 5 V for improved noise immunity. The current used to program CT is derived from the R_TACH resistor according to the following equation: I OSC + 25 R_TACH Amps The oscillator frequency is set by R_TACH and CT according to the following relationship: f OSC + 2.5 R_TACH CT Hz Timing resistor values should be between 25 k Ω and 500 kΩ, while capacitor values should be between 100 pF and 1 µF. Figure 3 provides a graph of oscillator frequency for various combinations of timing components. As with any high-frequency oscillator, timing components should be located as close as possible to the device pins when laying out the printed-circuit board. It is also important to reference the timing capacitor directly to the ground pin on the UCC3626 rather than daisy chaining it to another trace or the ground plane. This technique prevents switching current spikes in the local ground from causing jitter in the oscillator. synchronizing the oscillator A common system specification is to have all oscillators synchronized to a master clock. The UCC3626 provides a SYNCH input for this purpose. The SYNCH input is designed to interface with a digital clock pulse generated by the master oscillator. A positive-going edge on this input causes the UCC3626 oscillator to begin discharging. In order for the slave oscillator to function properly, it must be programmed for a frequency slightly lower than that of the master. Also, a resistor equal to R_TACH must be placed in parallel with CT. Figure 4 illustrates the waveforms for a slave oscillator programmed to 20 kHz with a master frequency of 30 kHz. The SYNCH pin must be grounded when not used. Figure 3 1.E+03 1.E+04 1.E+05 1.E+06 1.E–10 1.E–09 1.E–08 1.E–07 R_TACH = 25 k Ω R_TACH = 100 k Ω R_TACH = 500 k Ω R_TACH = 250 k Ω CT – Oscillator Timing Capacitance – F OSCILLATOR FREQUENCY vs TIMING CAPACITANCE (1) (2) |
Аналогичный номер детали - UC3626 |
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Аналогичное описание - UC3626 |
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