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UPC1909 Datasheet(PDF) 9 Page - NEC |
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UPC1909 Datasheet(HTML) 9 Page - NEC |
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9 / 16 page  Data Sheet G14309EJ1V0DS00 9 µµµµPC1909 TIMING CHART tqc Vd Oscillation waveform CT Feedback input FB OUT1 output waveform OUT2 output waveform Oscillation waveform CT’ tqd (1) Oscillation waveform (CT) This waveform is determined by the external capacitor connected to the CT pin (pin 16) and the external resistor connected to the RT pin (pin 15). It is usually a 1.5-V to 3.5-V triangle waveform (the rise and fall times are the same). (2) Output waveform (OUT1) Whichever is the lower of the DTC1 pin (pin 13) and FB pin (pin 12) voltages is compared with the triangle wave of the CT pin (pin 16). The OUT1 pin (pin 11) is high level while the triangle wave is low. (3) Output waveform (OUT2) Whichever is the higher of the DTC2 pin (pin 5) and FB pin (pin 12) voltages is compared with the level-shifted triangle wave (CT’). The OUT2 pin (pin 6) is high level while the level-shifted triangle wave is high. (4) Triangle wave level shift The triangle wave that controls OUT2 is the original triangle wave of the CT pin (pin 16) shifted to a lower potential via the level shift circuit (OLS). The amount of shift (Vd) can be adjusted using the resistor (RCT2) connected between the CT2 pin (pin 2) and the VREF pin. The relationship between the shift amount (Vd) and the resistance value (k Ω) of the resistor RCT2 connected to the CT2 pin (pin 2) is as follows. Vd = × 2 [V] RCT2[k Ω] + 10 4.3 (5) Dead-time (tqc, tqd) adjustment The dead time between the fall of OUT1 and the rise of OUT2 (tqc) and the dead time between the fall of OUT2 and the rise of OUT1 (tqd) is determined by the oscillation frequency and the amount of level shift of the triangle wave. Although usually tqc = tqd, if setting these independently, connect a suitable resistor between the CT pin and the VREF pin, as well as between the CT pin and GND, and adjust the dead time by making the oscillation waveform asymmetrical. |
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