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L6221A データシート(PDF) 11 Page - STMicroelectronics

部品番号 L6221A
部品情報  QUAD DARLINGTON SWITCH
Download  15 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6221A データシート(HTML) 11 Page - STMicroelectronics

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Figure 25 : Maximum Dissipable Power and Junc-
tion to Ambient Thermal Resistance
versus Side ”
α”
Figure 26 : Maximum Allowable Power Dissipa-
tion versus 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 L6221A can be reduced by sol-
deringthe GND pins to a suitablecopper 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 squarecopper 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.
L6221A - L6221AD - L6221N
11/15


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