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MC33363A Datasheet(PDF) 6 Page - ON Semiconductor

Part No. MC33363A
Description  HIGH VOLTAGE OFF-LINE SWITCHING REGULATOR
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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MC33363A Datasheet(HTML) 6 Page - ON Semiconductor

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MC33363A
6
MOTOROLA ANALOG IC DEVICE DATA
0
100
L, LENGTH OF COPPER (mm)
PD(max) for TA = 50°C
Figure 15. DW Suffix (SOP–16L) Thermal Resistance and
Maximum Power Dissipation versus P.C.B. Copper Length
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
Figure 16. P Suffix (DIP–16) Thermal Resistance and
Maximum Power Dissipation versus P.C.B. Copper Length
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
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 700 V and 1.0 A.


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