Electronic Components Datasheet Search |
|
MIC4423BWM Datasheet(PDF) 10 Page - Micrel Semiconductor |
|
MIC4423BWM Datasheet(HTML) 10 Page - Micrel Semiconductor |
10 / 12 page MIC4423/4424/4425 Micrel MIC4423/4424/4425 10 January 1999 = 12 x [(0.5 x 0.0035) + (0.5 x 0.0003)] = 0.0228W Total power dissipation, then, is: PD = 0.2160 + 0.0066 + 0.0228 = 0.2454W Assuming an SOIC package, with an θJA of 120°C/W, this will result in the junction running at: 0.2454 x 120 = 29.4 °C above ambient, which, given a maximum ambient temperature of 60 °C, will result in a maximum junction temperature of 89.4 °C. EXAMPLE 2: A MIC4424 operating on a 15V input, with one driver driving a 50 Ω resistive load at 1MHz, with a duty cycle of 67%, and the other driver quiescent, in a maximum ambient temperature of 40 °C: PL = I2 x RO x D First, IO must be determined. IO = VS / (RO + RLOAD) Given RO from the characteristic curves then, IO = 15 / (3.3 + 50) IO = 0.281A and: PL = (0.281)2 x 3.3 x 0.67 = 0.174W PT = F x VS 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: PQ = 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: PD = 0.174 + 0.025 + 0.0150 = 0.213W In a ceramic package with an θJA of 100°C/W, this amount of power results in a junction temperature given the maximum 40 °C ambient of: (0.213 x 100) + 40 = 61.4 °C The actual junction temperature will be lower than calculated both because duty cycle is less than 100% and because the graph lists RDS(on) at a TJ of 125°C and the RDS(on) at 61°C TJ will be somewhat lower. Definitions CL = 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 IH = Power supply current drawn by a driver when both inputs are high and neither output is loaded. IL = Power supply current drawn by a driver when both inputs are low and neither output is loaded. ID = Output current from a driver in Amps. PD = Total power dissipated in a driver in Watts. PL = Power dissipated in the driver due to the driver’s load in Watts. PQ = Power dissipated in a quiescent driver in Watts. PT = 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). RO= Output resistance of a driver in Ohms. VS= Power supply voltage to the IC in Volts. |
Similar Part No. - MIC4423BWM |
|
Similar Description - MIC4423BWM |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |