L6221CD datasheet(11/15 Pages) STMICROELECTRONICS

Il numero della parte	L6221CD

Spiegazioni elettronici	QUAD DARLINGTON SWITCH

PDF	15 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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Figure 25 : Maximum Dissipable Power

and Junction to Ambient Ther-

mal Resistance vs. Side "

α".

Figure 26 : Maximum Allowable Power

Dissipation vs. Ambient

Temperature.

Figure 24 : External Heatsink Mounting

Example.

Figure 23 : Example of P.C. Board Copper

Area Which is Used as Heatsink.

MOUNTING INSTRUCTION

The Rth j-amb of the L6221C can be reduced by sol-

dering the GND pins to a suitable copper area of the

printed circuit board (Fig. 23) or to an external

heatsink (Fig. 24).

The diagram of figure 25 shows the maximum dis-

sipable power Ptot and the Rth j-amb as a function of

the side "

α" of two equal square copper areas hav-

ing a thickness of 35

µ (1.4 mils). During soldering

the pins temperature must not exceed 260

°C and

the soldering time must not be longer than 12 sec-

onds.

The external heatsink or printed circuit copper area

must be connected to electrical ground.

L6221C

11/15

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