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MIC4124 Datasheet(PDF) 9 Page - MIC GROUP RECTIFIERS |
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MIC4124 Datasheet(HTML) 9 Page - MIC GROUP RECTIFIERS |
9 / 11 page MIC4123/4124/4125 Micrel, Inc. M9999-052405 9 May 2005 P Q = V S x [D x IH + (1 – D) x IL] = 12 x [(0.5 x 0.0035) + (0.5 x 0.0003)] = 0.0228W Total power dissipation, then, is: P D = 0.2160 + 0.0066 + 0.0228 = 0.2454W Assuming an E-Pad SOIC package, with an θ JA of 58°C/W, this will result in the junction running at: 0.2454 x 58 = 14.2°C above ambient, which, given a maximum ambient tempera- ture of 60°C, will result in a maximum junction temperature of 89.4°C. EXAMPLE 2: A MIC4124 operating on a 15V input, with one driver driving a 50Ω resistive load at 1MHz, with a duty cycle of 67%, and the other driver quiescent, in a maximum ambi- ent temperature of 40°C: P L = I 2 x R O x D First, I O must be determined. I O = VS / (RO + RLOAD) Given R O from the characteristic curves then, I O = 15 / (3.3 + 50) I O = 0.281A and: P L = (0.281)2 x 3.3 x 0.67 = 0.174W P T = F x V S x (A•s)/2 (because only one side is operating) = (1,000,000 x 15 x 3.3 x 10–9) / 2 = 0.025 W and: P Q = 15 x [(0.67 x 0.00125) + (0.33 x 0.000125) + (1 x 0.000125)] (this assumes that the unused side of the driver has its input grounded, which is more efficient) = 0.015W then: P D = 0.174 + 0.025 + 0.0150 = 0.213W In a MLF with an θ JA of 60°C/W, this amount of power results in a junction temperature given the maximum 40°C ambient of: (0.213 x 100) + 40 = 52.8°C The actual junction temperature will be lower than calculated both because duty cycle is less than 100% and because the graph lists R DS(on) at a TJ of 125°C and the RDS(on) at 52.8°C TJ will be somewhat lower. Definitions C L = Load Capacitance in Farads. D = Duty Cycle expressed as the fraction of time the input to the driver is high. f = Operating Frequency of the driver in Hertz. I H = Power supply current drawn by a driver when both inputs are high and neither output is loaded. I L = Power supply current drawn by a driver when both inputs are low and neither output is loaded. I D = Output current from a driver in Amps. P D = Total power dissipated in a driver in Watts. P L = Power dissipated in the driver due to the driver’s load in Watts. P Q = Power dissipated in a quiescent driver in Watts. P T = Power dissipated in a driver when the output changes states (“shoot-through current”) in Watts. NOTE: The “shoot-through” current from a dual transition (once up, once down) for both drivers is stated in the graph on the following page in ampere- nanoseconds. This figure must be multiplied by the number of repetitions per second (frequency to find Watts). R O = Output resistance of a driver in Ohms. V S = Power supply voltage to the IC in Volts. |
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