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L6234 Arkusz danych(PDF) 3 Page - STMicroelectronics |
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L6234 Arkusz danych(HTML) 3 Page - STMicroelectronics |
3 / 10 page THERMAL DATA Symbol Parameter DIP16+2+2 PowerSO20 Unit Rth j-pin Thermal Resistance, Junction to Pin 12 – °C/W Rth j-amb1 Thermal Resistance, Junction to Ambient (see Thermal Characteristics) 40 – °C/W Rth j-amb2 Thermal Resistance, Junction to Ambient (see Thermal Characteristics) 50 – °C/W Rth j-case Thermal Resistance Junction-case – 1.5 °C/W Figure 1: Printed Heatsink THERMAL CHARACTERISTICS Rth j-pins DIP16+2+2. The thermal resistance is referred to the thermal path from the dissipating region on the top surface of the silicon chip, to the points along the four central pins of the package, at a distance of 1.5 mm away from the stand-offs. Rth j-amb1 If a dissipating surface, thick at least 35 µm, and with a surface similar or bigger than the one shown, is created making use of the printed cir- cuit. Such heatsinking surface is considered on the bottom side of an horizontal PCB (worst case). Rth j-amb2 If the power dissipating pins (the four central ones), as well as the others, have a minimum thermal connection with the external world (very thin strips only) so that the dissipation takes place through still air and through the PCB itself. It is the same situation of point above, without any heatsinking surface created on purpose on the board. Additional data on the PowerDip and the PowerSO20 package can be found in: Application Note AN467: Thermal Characteristics of the PowerDip 20,24 Packages Soldered on 1,2,3 oz. Copper PCB Application Note AN668: A New High Power IC Surface Mount Package: PowerSO20 Power IC Packaging from Insertion to Surface Mounting. L6234 3/10 |
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