MC33365(2006) データシートの表示（PDF） - ON Semiconductor

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MC33365
(Rev.:2006)

High Voltage Switching Regulator

ON Semiconductor 

MC33365

short−circuit protection. This output requires an external

bypass capacitor of at least 1.0 μF for stability.

Thermal Shutdown and Package

Internal thermal circuitry is provided to protect the Power

Switch in the event that the maximum junction temperature

is exceeded. When activated, typically at 150°C, the Latch

is forced into a ‘reset’ state, disabling the Power Switch. The

Latch is allowed to ‘set’ when the Power Switch temperature

falls below 140°C. This feature is provided to prevent

catastrophic failures from accidental device overheating. It

is not intended to be used as a substitute for proper

heatsinking.

The MC33365 is contained in a heatsinkable plastic

dual−in−line package in which the die is mounted on a

special heat tab copper alloy lead frame. This tab consists of

the four center ground pins that are specifically designed to

improve thermal conduction from the die to the circuit

board. Figure 16 shows a simple and effective method of

utilizing the printed circuit board medium as a heat

dissipater by soldering these pins to an adequate area of

copper foil. This permits the use of standard layout and

mounting practices while having the ability to halve the

junction to air thermal resistance. The examples are for a

symmetrical layout on a single−sided board with two ounce

per square foot of copper.

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