MC33363A Datasheet, PDF (6/12 Pages) ON Semiconductor – HIGH VOLTAGE OFF-LINE SWITCHING REGULATOR

MC33363A
Figure 15. DW Suffix (SOP–16L) Thermal Resistance and
Maximum Power Dissipation versus P.C.B. Copper Length
100
2.8
PD(max) for TA = 50°C
90
2.4
80
70
60
2.0
Printed circuit board heatsink example
ÏÏÏÏÏÏ _L
2.0 oz
Copper
ÏÏÏÏÏÏÏÏÏÏÏÏ _L
1.6
1.2
3.0 mm
50
Graphs represent symmetrical layout _0.8
R_θJA
40
0.4
Figure 16. P Suffix (DIP–16) Thermal Resistance and
Maximum Power Dissipation versus P.C.B. Copper Length
100
80
ÏÏÏÏÏÏÏÏÏÏ ^{Printed circuit board heatsink example}
L
2.0 oz
Copper
5.0
4.0
60
R_θJA
L
3.0 mm
Graphs represent symmetrical layout
3.0
40
2.0
20
PD(max) for TA = 70°C
1.0
30
0
0
10
20
30
40
50
L, LENGTH OF COPPER (mm)
0
0
0
10
20
30
40
50
L, LENGTH OF COPPER (mm)
Pin
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₂
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₃
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{4, 5, 12, 13}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₆
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₇
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₈
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₉
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁₀
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁₁
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ _{14, 15}
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ₁₆
Function
Startup Input
–
VCC
Ground
R_T
C_T
Regulator Output
Compensation
Voltage Feedback
Input
Overvoltage
Protection Input
–
Power Switch
Drain
PIN FUNCTION DESCRIPTION
Description
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_CC pin to ground.
This pin has been omitted for increased spacing between the rectified ac line voltage on Pin 1 and
the V_CC potential on Pin 3.
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.
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 RT connects from this pin to ground. The value selected will program the Current Limit
Comparator threshold and affect the Oscillator frequency.
Capacitor CT connects from this pin to ground. The value selected, in conjunction with resistor RT,
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 µF 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.
6
MOTOROLA ANALOG IC DEVICE DATA