Datenblatt-Suchmaschine für elektronische Bauteile |
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UCC2974 Datenblatt(PDF) 9 Page - Texas Instruments |
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UCC2974 Datenblatt(HTML) 9 Page - Texas Instruments |
9 / 14 page UCC2974 UCC3974 SLUS485A – JULY 2001 – REVISED NOVEMBER 2001 9 www.ti.com APPLICATION INFORMATION low-frequency dimming oscillator The oscillator for the LFD section of the device is an R-C relaxation oscillator with programmable upslope and downslope on its timing ramp. Figure 3 shows a simplified LFD oscillator diagram that illustrates the principle. The charge time for the timing capacitor, CT is the time it takes to charge that capacitor from 0.5 V to 3 V from a 4.2-V source through RC. This time is: tc + 1.126 R C C T The discharge time is the time it takes to discharge the CT capacitor from 3 V to 0.5 V through RD connected to GND. This time is: t d + 1.792 R D C T The period of the LFD oscillator is simply the sum of the charge and discharge times, or T + C T 1.126 R C ) 1.792 R D The minimum duty cycle of the LFD PWM when operating in this mode is: d min + t d T UDG–01025 6 7 + + SQ Q R 4.3 0.5 3.0 RC RD RC RD CT 4.3 3.0 0.5 0.0 T CHARGE DISCHARGE tC tD Figure 3. LFD Oscillator (1) (2) (3) (4) |
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Ähnliche Beschreibung - UCC2974 |
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