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LM6321M Datasheet(PDF) 8 Page - National Semiconductor (TI) |
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LM6321M Datasheet(HTML) 8 Page - National Semiconductor (TI) |
8 / 11 page Application Hints (Continued) pation in any application is P D =(TJ(max)−TA)/ θ JA. For the simple case of a buffer driving a resistive load as in Figure 2, the maximum DC power dissipation occurs when the output is at half the supply. Assuming equal supplies, the formula is P D =IS (2V +)+V+2/4 R L. The next parameter which must be calculated is the maxi- mum allowable temperature rise, T R(max). This is calculated by using the formula: T R(max) = TJ(max) − TA(max) where: T J(max) is the maximum allowable junction temperature T A(max) is the maximum ambient temperature Using the calculated values for T R(max) and P(max), the required value for junction-to-ambient thermal resistance, θ (J–A), can now be found: θ (J–A) =TR(max)/P(max) The heatsink for the LM6321 is made using the PC board copper. The heat is conducted from the die, through the lead frame (inside the part), and out the pins which are soldered to the PC board. The pins used for heat conduction are: TABLE 1. Part Package Pins LM6321N 8-Pin DIP 1, 4, 5, 8 LM6321M 14-Pin SO 1, 2, 3, 6, 7, 8, 9, 13, 14 Figure 3 shows copper patterns which may be used to dissipate heat from the LM6321. TABLE 2. Package L (in.) H (in.) θ JA (˚C/W) 8-Pin DIP 2 0.5 47 14-Pin SO 1 0.5 69 21 57 Table 2 shows some values of junction-to-ambient thermal resistance ( θ JA) for values of L and W for 2 oz. copper: 00922308 FIGURE 2. 8-Pin DIP 00922309 14-Pin SOIC 00922310 *For best results, useL=2H FIGURE 3. Copper Heatsink Patterns www.national.com 8 |
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