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Si82398CD4-IS Folha de dados(PDF) 10 Page - Silicon Laboratories |
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Si82398CD4-IS Folha de dados(HTML) 10 Page - Silicon Laboratories |
10 / 38 page Substituting values for PDmax Tjmax, TA, and θja into Equation 2 results in a maximum allowable total power dissipation of 1.19 W. Maximum allowable load is found by substituting this limit and the appropriate data sheet values from Table 4.1 Electrical Characteris- tics1,2 on page 15 into Equation 1 and simplifying. The result is Equation 3 (4.0 A driver), which assumes VDDI = 5 V and VDDA = VDDB = 18 V. Equation 3 is graphed in the following figure where the points along the load line represent the package dissipation-limited value of CL for the corresponding switching frequency. Figure 2.15. Max Load vs. Switching Frequency 2.5 Layout Considerations It is most important to minimize ringing in the drive path and noise on the Si8239x VDD lines. Care must be taken to minimize parasitic inductance in these paths by locating the Si8239x as close to the device it is driving as possible. In addition, the VDD supply and ground trace paths must be kept short. For this reason, the use of power and ground planes is highly recommended. A split ground plane system having separate ground and VDD planes for power devices and small signal components provides the best overall noise performance. 2.6 Undervoltage Lockout Operation Device behavior during start-up, normal operation and shutdown is shown in Figure 2.16 Si82391/6/8 Device Behavior during Normal Operation and Shutdown on page 10, where UVLO+ and UVLO- are the positive-going and negative-going thresholds respectively. Note that outputs VOA and VOB default low when input side power supply (VDDI) is not present. 2.6.1 Device Startup Outputs VOA and VOB are held low during power-up until VDD is above the UVLO threshold for time period tSTART. Following this, the outputs follow the states of inputs VIA and VIB. Si8239x Data Sheet System Overview silabs.com | Smart. Connected. Energy-friendly. Rev. 0.9 | 9 |
Nº de peça semelhante - Si82398CD4-IS |
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Descrição semelhante - Si82398CD4-IS |
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