MC33363A

http://onsemi.com

7

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

2

--

This pin has been omitted for increased spacing between the rectified ac line voltage on Pin 1 and

3

This is the positive supply voltage input. During startup, power is supplied to this input from Pin 1.

supplied from an auxiliary transformer winding.

4, 5, 12, 13

GND

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

Comparator threshold and affect the Oscillator frequency.

7

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 mF 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 700 V and 1.0 A.

ORDERING INFORMATION

Device

Package

MC33363ADWG

SOIC--16WB

(Pb--Free)

47 Units / Rail

MC33363ADWR2G

SOIC--16WB

(Pb--Free)

1000 / Tape & Reel

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.