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UCC3809PW-1G4 Datasheet(PDF) 6 Page - Texas Instruments |
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UCC3809PW-1G4 Datasheet(HTML) 6 Page - Texas Instruments |
6 / 16 page 6 UCC1809-1/-2 UCC2809-1/-2 UCC3809-1/-2 The recommended value for CT is 1nF for frequencies in the 100 kHz or less range and smaller CT for higher fre- quencies. The minimum recommended values of RT1 and RT2 are 10k Ω and 4.32kΩ, respectively. Using these values maintains a ratio of at least 20:1 between the RDS(on) of the internal FETs and the external timing resis- tors, resulting in minimal change in frequency over tem- perature. Because of the oscillator's susceptibility to capacitive coupling, examine the oscillator frequency by looking at the common RT1-RT2-CT node on the circuit board as opposed to looking at pins 3 and 4 directly. For good noise immunity, RT1 and RT2 should be placed as close to pins 3 and 4 of the IC as possible. CT should be returned directly to the ground pin of the IC with minimal stray inductance and capacitance. 10 100 1000 100 1000 10000 CT [pF] Figure 4. Oscillator frequency vs. CT (RT1 = 10k, RT2 = 4.32k) CT S(OSC) R(OSC) Q(OSC)=CLK =S(PWM) FB R(PWM) Q(PWM) OUT CT CHARGING CT DISCHARGING 3.33V 1.67V 1V 70% ON 30% OFF FB SIGNAL DOMINANT MAX. DUTY CYCLE DOMINANT Figure 3. Waveforms associated with the oscillator latch and the PWM latch. APPLICATION INFORMATION (cont.) UDG-99037 |
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