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MIC4224YMME Datasheet(PDF) 11 Page - MIC GROUP RECTIFIERS |
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MIC4224YMME Datasheet(HTML) 11 Page - MIC GROUP RECTIFIERS |
11 / 20 page Micrel, Inc. MIC4223/MIC4224/MIC4225 June 2009 11 M9999-061109-A (408) 944-0800 Quiescent Current Power Dissipation Quiescent current powers the internal logic, level shifting circuitry and bias for the output drivers. This current is proportional to operating frequency and VDD voltage. The typical characteristic graphs show how supply current varies with switching frequency and supply voltage. The power dissipated by the driver’s quiescent current is: DD DD quiescent I V Pdiss × = Total Power Dissipation and Thermal Considerations Total package power dissipation equals the power dissipation of each driver caused by driving the external MOSFETs plus the supply current. B A quiescent TOTAL Pdriver Pdriver Pdiss Pdiss + + = The die temperature may be calculated once the total power dissipation is known. JA TOTAL A J Pdiss T T θ × + = Where: TA is the Maximum ambient temperature TJ is the junction temperature (°C) PdissTOTAL is the power dissipation of the Driver θ JA is the thermal resistance from junction-to- ambient air (°C/W) The following graphs help determine the maximum gate charge that can be driven with respect to switching frequency, supply voltage and ambient temperature. Figure 5a shows the power dissipation in the driver for different values of gate charge with VDD = 5V. Figure 5b shows the power dissipation at VDD = 12V. Figure 5c show the maximum power dissipation for a given ambient temperature for the SOIC and ePAD MSOP packages. The maximum operating frequency of the driver may be limited by the maximum power dissipation of the driver package. 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 100k 1M FREQUENCY (Hz) 10M PDISS: GATE Charge vs. Frequency VDD=5V 10nC 20nC 30nC 40nC 50nC Figure 5a. PDISS vs. QG and fS for VDD = 5V 100k 1M FREQUENCY (Hz) 10M PDISS: GATE Charge vs. Frequency 1.4 1.6 1.8 2.0 1.2 1.0 0.8 0.6 0.4 0.2 0 VDD=12V 10nC 20nC 30nC 40nC 50nC Figure 5b. PDISS vs. QG and fS for VDD = 12V Maximum Power Dissipation 0.0 0.5 1.0 1.5 2.0 20 40 60 80 100 120 140 Ambient Temperature (°C) Figure 5c. Maximum PDISS vs. Ambient Temperature |
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