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HIP6201 Datasheet(PDF) 8 Page - Intersil Corporation |
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HIP6201 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 9 page 2-448 In actual systems, the load transient will most likely be of varying frequency and step size. The power dissipation of the HIP6200/1 becomes even more difficult to estimate analytically. HIP6200 Temperature Rise The HIP6200/1 junction temperature can be estimated simply by: where: ΘJA is the thermal resistance from junction to ambient. Example: HIP6200/1 Junction Temperature Calculation TAMBIENT = 70 oC PDISS = 0.2W ΘJA = 100oC/W THIP6200 = 70 oC + (0.2 x 100) = 90oC In a similar fashion, one could estimate the maximum allowable power dissipation for given maximum ambient and transient loading and determine the boundary of maximum transient frequency. Example Maximum Transient Frequency Calculation TAMBIENT = 70 oC THIP6200 = 110 oC max ΘJA = 80oC/W (this number is dependent upon airflow and the amount of pc board trace connected to HIP6200 Max PDISS = (110 oC - 70oC)/(80oC/W) = 0.5W From Figures 4 and 5, the estimated maximum transient frequency is obtained for any of the seven cases shown. For instance, from Figure 4, the maximum transient frequency is about 4kHz for the 8A transient step and the conditions stipulated. FIGURE 5. ESTIMATED HIP6200, HIP6201 POWER DISSIPATION vs CONVERTER RESPONSE TIME TRANSIENT FREQUENCY (Hz) 102 103 104 0.1 0.2 0.3 0.4 0.5 0.6 TR1 = 2µs, TR2 = 10µs TR1 = 5µs, TR2 = 20µs TR1 = 10µs, TR2 = 30µs TR1 = 15µs, TR2 = 40µs T HIP6200 T AMBIENT P DISS Θ JA • () + = (EQ. 8) HIP6200, HIP6201 |
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