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MC33260PG Datasheet(PDF) 8 Page - ON Semiconductor |
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MC33260PG Datasheet(HTML) 8 Page - ON Semiconductor |
8 / 22 page MC33260 http://onsemi.com 8 PIN FUNCTION DESCRIPTION Pin # PDIP−8 Pin # SO−8 Function Description 1 7 Feedback Input This pin is designed to receive a current that is proportional to the preconverter output voltage. This information is used for both the regulation and the overvoltage and undervoltage protections. The current drawn by this pin is internally squared to be used as oscillator capacitor charge current. 2 8 Vcontrol This pin makes available the regulation block output. The capacitor connected between this pin and ground, adjusts the control bandwidth. It is typically set below 20 Hz to obtain a nondistorted input current. 3 1 Oscillator Capacitor (CT) The circuit uses an on−time control mode. This on−time is controlled by comparing the CT voltage to the Vcontrol voltage. CT is charged by the squared feedback current. 4 2 Zero Current Detection Input This pin is designed to receive a negative voltage signal proportional to the current flowing through the inductor. This information is generally built using a sense resistor. The Zero Current Detection prevents any restart as long as the Pin 4 voltage is below (−60 mV). This pin is also used to perform the peak current limitation. The overcurrent threshold is programmed by the resistor connected between the pin and the external current sense resistor. 5 3 Synchronization Input This pin is designed to receive a synchronization signal. For instance, it enables to synchronize the PFC preconverter to the associated SMPS. If not used, this pin must be grounded. 6 4 Ground This pin must be connected to the preregulator ground. 7 5 Gate Drive The gate drive current capability is suited to drive an IGBT or a power MOSFET. 8 6 VCC This pin is the positive supply of the IC. The circuit turns on when VCC becomes higher than 11 V, the operating range after startup being 8.5 V up to 16 V. Figure 21. Application Schematic 18 7 6 5 2 3 4 L1 Filtering Capacitor Sync M1 C1 D1 + Vcontrol VCC Load (SMPS, Lamp Ballast,...) Ro CT ROCP Rcs D1...D4 DIP−8 CONFIGURATION SHOWN |
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