Datenblatt-Suchmaschine für elektronische Bauteile |
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L6563S Datenblatt(PDF) 8 Page - STMicroelectronics |
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L6563S Datenblatt(HTML) 8 Page - STMicroelectronics |
8 / 42 page Pin connection L6563S 8/42 Doc ID 16116 Rev 3 3 Pin connection Figure 2. Pin connection Table 3. Pin description n° Name Function 1INV Inverting input of the error amplifier. The information on the output voltage of the PFC pre- regulator is fed into the pin through a resistor divider. The pin normally features high impedance but, if the tracking boost function is used, an internal current generator programmed by TBO (pin 6) is activated. It sinks current from the pin to change the output voltage so that it tracks the mains voltage. 2COMP Output of the error amplifier. A compensation network is placed between this pin and INV (pin 1) to achieve stability of the voltage control loop and ensure high power factor and low THD. To avoid uncontrolled rise of the output voltage at zero load, when the voltage on the pin falls below 2.4 V the gate driver output will be inhibited (burst-mode operation). 3MULT Mains input to the multiplier. This pin is connected to the rectified mains voltage via a resistor divider and provides the sinusoidal reference to the current loop. The voltage on this pin is used also to derive the information on the RMS mains voltage. 4CS Input to the PWM comparator. The current flowing in the MOSFET is sensed through a resistor, the resulting voltage is applied to this pin and compared with an internal reference to determine MOSFET’s turn-off. A second comparison level at 1.7 V detects abnormal currents (e.g. due to boost inductor saturation) and, on this occurrence, activates a safety procedure that temporarily stops the converter and limits the stress of the power components. 5VFF Second input to the multiplier for 1/V2 function. A capacitor and a parallel resistor must be connected from the pin to GND. They complete the internal peak-holding circuit that derives the information on the RMS mains voltage. The voltage at this pin, a dc level equal to the peak voltage on pin MULT (3), compensates the control loop gain dependence on the mains voltage. Never connect the pin directly to GND but with a resistor ranging from 100 k Ω (minimum) to 2 M Ω (maximum). 6TBO Tracking boost function. This pin provides a buffered VFF voltage. A resistor connected between this pin and GND defines a current that is sunk from pin INV (#1). In this way, the output voltage is changed proportionally to the mains voltage (tracking boost). If this function is not used leave this pin open. |
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