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EVAL6569 Datasheet(PDF) 6 Page - Panasonic Semiconductor |
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EVAL6569 Datasheet(HTML) 6 Page - Panasonic Semiconductor |
6 / 14 page charged and the circuit can restart immediately. This method is suitable when the inverter uses only one DC blocking capacitor connected to the power ground, as used on figure 11 for Compact Fluorescent Lamp. Pulling the VS voltage below the UVLO turns off the oscillator and gives the same bridge configuration. For the L6569A, discharging the VS supply below the UVLO turns off both MOSFETs. An SCR like the X0202MA may be used for the reset function. If the current flowing through the supply resistor is higher than the SCR holding current (see figure 12), the SCR will remain on and the two MOS- FETs off. Removing power or commutating the SCR allows a new start up [4]. Otherwise a disable circuitry that turns off the two MOSFETs (see figure13), can achieve the shut- down function. Compared to the SCR solution, the shutdown is immediate and the inverter can restart on the disable order. H.V. L6569 Vs 200 200 100nF 5.6k VS BOOT HVG OUT LVG GND CF RF VIN DISABLE HCF4011 22 4.7 k W BC327 Figure 13: L6569 disable circuitry with both MOSFETs off. L 6569A Rs R R C shutdown OFF OFF Figure 12: Shutdown with a thyristor & a serial resistor to slow down the supply voltage decay. L 6569 ON R F R L C F Figure 11: L6569 shutdown through the CF oscillator pin. AN880 APPLICATION NOTE 6/14 |
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