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Si8275BBD-IS1 데이터시트(PDF) 10 Page - Silicon Laboratories |
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Si8275BBD-IS1 데이터시트(HTML) 10 Page - Silicon Laboratories |
10 / 43 page 2.3 Power Supply Connections Isolation requirements mandate individual supplies for VDDI, VDDA, and VDDB. The decoupling caps for these supplies must be placed as close to the VDD and GND pins of the Si827x as possible. The optimum values for these capacitors depend on load current and the distance between the chip and the regulator that powers it. Low effective series resistance (ESR) capacitors, such as Tantalum, are recommended. 2.4 Power Dissipation Considerations Proper system design must assure that the Si827x operates within safe thermal limits across the entire load range.The Si827x total power dissipation is the sum of the power dissipated by bias supply current, internal parasitic switching losses, and power dissipated by the series gate resistor and load. The equation below shows total Si827x power dissipation. PD = (VDDI)(IDDI) + 2(IDD2)(VDD2) + ( f )(QG) (V DD2 ) Rp Rp + Rg + (f)(Q G )(V DD2 ) Rn Rn + Rg + 2 fCintVDD22 where: PD is the total Si827x device power dissipation (W) IDDI is the input-side maximum bias current (10 mA) IDD2 is the driver die maximum bias current (4 mA) Cint is the internal parasitic capacitance (370 pF) VDDI is the input-side VDD supply voltage (2.5 to 5.5 V) VDD2 is the driver-side supply voltage (4.2 to 30 V) f is the switching frequency (Hz) QG is the gate charge of external FET RG is the external gate resistor RP is the RDS(ON) of the driver pull-up switch: 2.7 Ω Rn is the RDS(ON) of the driver pull-down switch: 1 Ω Equation 1 Power dissipation example for driver using Equation 1 with the following givens: VDDI = 5.0 V VDD2 = 12 V f = 350 kHz RG = 22 Ω QG = 25 nC Pd = 199 mW From which the driver junction temperature is calculated using Equation 2, where: Pd is the total Si827x device power dissipation (W) θja is the thermal resistance from junction to air (105 °C/W in this example) TA is the ambient temperature T j = Pd × θ ja + TA = (0.199)(105) + 20 = 41.0 ° C Si827x Data Sheet System Overview silabs.com | Smart. Connected. Energy-friendly. Preliminary Rev. 0.5 | 9 |
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