MC33363A Motorola, MC33363A Datasheet - Page 6

• Manufacturer Part Number: MC33363A
• Description: HIGH VOLTAGE OFF-LINE SWITCHING REGULATOR
• Manufacturer: Motorola

Maximum Power Dissipation versus P.C.B. Copper Length
Figure 15. DW Suffix (SOP–16L) Thermal Resistance and
100
90
80
70
60
50
40
30
6
4, 5, 12, 13
0
14, 15
Pin
10
16
11
1
2
3
6
7
8
9
10
Startup Input
–
V CC
Ground
R
C
Regulator Output
Compensation
Voltage Feedback
Input
Overvoltage
Protection Input
–
Power Switch
Drain
L, LENGTH OF COPPER (mm)
R JA
T
T
Function
P D(max) for T A = 50 C
20
Ï Ï Ï
Ï Ï Ï
Ï Ï Ï
Printed circuit board heatsink example
Graphs represent symmetrical layout
L
30
Copper
2.0 oz
When V CC reaches the UVLO upper threshold, the startup MOSFET turns off and power is supplied
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 V
This pin has been omitted for increased spacing between the rectified ac line voltage on Pin 1 and
the V
This is the positive supply voltage input. During startup, power is supplied to this input from Pin 1.
from an auxiliary transformer winding.
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.
Resistor R T connects from this pin to ground. The value selected will program the Current Limit
Comparator threshold and affect the Oscillator frequency.
Capacitor C T connects from this pin to ground. The value selected, in conjunction with resistor R T ,
programs the Oscillator frequency.
This 6.5 V output is available for biasing external circuitry. It requires an external bypass capacitor
of at least 1.0 F for stability.
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.
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.
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.
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.
This pin is designed to directly drive the converter transformer and is capable of switching a
maximum of 700 V and 1.0 A.
L
CC
Ï Ï Ï
Ï Ï Ï
Ï Ï Ï
40
potential on Pin 3.
PIN FUNCTION DESCRIPTION
3.0 mm
50
MC33363A
2.8
2.4
2.0
1.6
1.2
0.8
0.4
0
Maximum Power Dissipation versus P.C.B. Copper Length
100
80
60
40
20
0
Figure 16. P Suffix (DIP–16) Thermal Resistance and
0
Description
CC
pin to ground.
10
P D(max) for T A = 70 C
MOTOROLA ANALOG IC DEVICE DATA
R JA
L, LENGTH OF COPPER (mm)
20
Printed circuit board heatsink example
Graphs represent symmetrical layout
L
Ï Ï Ï
Ï Ï Ï
30
Copper
2.0 oz
L
Ï Ï Ï
Ï Ï Ï
40
3.0 mm
50
5.0
4.0
3.0
2.0
1.0
0