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MC33362 Datasheet(PDF) 6 Page - ON Semiconductor |
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MC33362 Datasheet(HTML) 6 Page - ON Semiconductor |
6 / 12 page MC33362 6 MOTOROLA ANALOG IC DEVICE DATA 0 100 L, LENGTH OF COPPER (mm) PD(max) for TA = 50°C R θJA 90 70 60 80 50 10 20 30 40 50 2.8 2.4 1.6 1.2 2.0 0.8 0.4 0 40 30 0 0 Graphs represent symmetrical layout 3.0 mm Printed circuit board heatsink example L L 100 80 60 40 20 10 20 30 40 50 L, LENGTH OF COPPER (mm) 5.0 4.0 3.0 2.0 1.0 0 PD(max) for TA = 70°C 2.0 oz Copper R θJA Graphs represent symmetrical layout 3.0 mm L L 2.0 oz Copper Printed circuit board heatsink example Figure 15. DW Suffix (SOP–16L) Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length Figure 16. P Suffix (DIP–16) Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length PIN FUNCTION DESCRIPTION Pin Function Description 1 Startup Input This pin connects directly to the rectified ac line voltage source. Internally Pin 1 is tied to the drain of a high voltage startup MOSFET. During startup, the MOSFET supplies internal bias, and charges an external capacitor that connects from the VCC pin to ground. 2 – This pin has been omitted for increased spacing between the rectified AC line voltage on Pin 1 and the VCC potential on Pin 3. 3 VCC This is the positive supply voltage input. During startup, power is supplied to this input from Pin 1. When VCC reaches the UVLO upper threshold, the startup MOSFET turns off and power is supplied from an auxiliary transformer winding. 4, 5, 12, 13 Ground These pins are the control circuit grounds. They are part of the IC lead frame and provide a thermal path from the die to the printed circuit board. 6 RT Resistor RT connects from this pin to ground. The value selected will program the Current Limit Comparator threshold and affect the Oscillator frequency. 7 CT Capacitor CT connects from this pin to ground. The value selected, in conjunction with resistor RT, programs the Oscillator frequency. 8 Regulator Output This 6.5 V output is available for biasing external circuitry. It requires an external bypass capacitor of at least 1.0 µF for stability. 9 Compensation This pin is the Error Amplifier output and is made available for loop compensation. It can be used as an input to directly control the PWM Comparator. 10 Voltage Feedback Input This is the inverting input of the Error Amplifier. It has a 2.6 V threshold and normally connects through a resistor divider to the converter output, or to a voltage that represents the converter output. 11 Overvoltage Protection Input This input provides runaway output voltage protection due to an external component or connection failure in the control loop feedback signal path. It has a 2.6 V threshold and normally connects through a resistor divider to the converter output, or to a voltage that represents the converter output. 14, 15 – These pins have been omitted for increased spacing between the high voltages present on the Power Switch Drain, and the ground potential on Pins 12 and 13. 16 Power Switch Drain This pin is designed to directly drive the converter transformer and is capable of switching a maximum of 500 V and 2.0 A. |
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