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ATR2812DFHB Datasheet(PDF) 6 Page - International Rectifier |
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ATR2812DFHB Datasheet(HTML) 6 Page - International Rectifier |
6 / 8 page 6 www.irf.com ATR28XXD Series Connecting the inhibit input (Pin 2) to input common (Pin 10) will cause the converter to shut down. It is recommended that the inhibit pin be driven by an open collector device capable of sinking at least 400µA of current. The open circuit voltage of the inhibit input is 11.5 ±1.0VDC. Assuming that there is no forced air flow, the package temperature rise above ambient ( ∆T) may be calculated using the following expression: where A = the effective surface area in square inhes (in-cluding heat sink if used), P d = power dissipation in watts. The total surface area of the ATR standard package is 7.34 square inches. If a worse case full load efficiency of 78% is assumed, then the case temperature rise can be calculated as follows: Hence, if T AMBIENT = +25°C, the DC/DC converter case temperature will be approximately 147 °C if no heat sink or air flow is provided. Block Diagram Application Information Inhibit Function Thermal Management ∆Τ = 80 A –0.7 P d 0.85 (°C) (1) W Eff P P OUT d 5 8 1 78 1 30 1 1 . = ⎥⎦ ⎤ ⎢⎣ ⎡ − = ⎥⎦ ⎤ ⎢⎣ ⎡ − = and ∆Τ = 80 (7.34) –0.7 (8.5)0.85 = 122°C To calculate the heat sink area required to maintain a specific case temperature rise, equation (1) may be manipulated as follows: PKG d HEATSINK A P T A − ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎣ ⎡ ∆ = − 43 1 85 0 80 . . As an example, if it is desired to limit the case temperature rise to a maximum of 50 °C above ambient, the required effective heat sink area is: 2 43 1 85 0 1 19 34 7 5 8 80 50 in A HEATSINK . . ) . ( . . = − ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ = − EMI Filter An EMI filter (AFC461), available as an option, will reduce the input ripple current to levels below the limits imposed by MIL-STD-461B CEO3. Whenever multiple DC/DC converters are utilized in a single system, significant low frequency noise may be generated due to slight difference in the switching frequencies of the converters (beat frequency noise). Because of the low frequency nature of this noise (typically less than 10KHz), it is difficult to filter out and may interfere with proper operation of sensitive systems (communications, radar or telemetry). The International Rectifier ATR28XX converters provide a synchronizing input permitting synchronization of multiple converters to the frequency of the users system clock, thereby minimizing this type of noise. Device Synchronization 3 4 +Vout Output Return Pulse Width Modulator Primary Housekeeping Supply EMI Filter 1 2 9 10 +Input Inhibit Input Sync Input Return FB CS Drive 5 -Vout 8 Case Error Amp & Ref Regulator |
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