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ATR2803R3SFCH Datasheet(PDF) 10 Page - International Rectifier |
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ATR2803R3SFCH Datasheet(HTML) 10 Page - International Rectifier |
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10 / 12 page  10 www.irf.com ATR28XXS 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 inches (Including heat sink if used),P d = power dissipation in watts. The total surface area of the ATR package is 7.34 square inches. If a worse case full load efficiency of 76% is assumed, then the case temperature rise of an ATR2805S can be calculated as follows: Hence, if T AMBIENT = +25°C, the DC/DC converter case temperature will be approximately 159 °C if no heat sink or air flow is provided. Block Diagram Application Information Inhibit Function Thermal Management To calculate the heat sink area required to maintain a specific case temperature rise, the above equation may be manipulated as follows: PKG d HEATSINK A P T A − ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎣ ⎡ ∆ = − 43 1 85 0 80 . . As an example, if a maximum case temperature rise of 50 °C above ambient is required, then the required effective heat sink area is: EMI Filter An Optional EMI filter (AFC461)is available that 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. 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. International Rectifier permits synchronization of multiple ATR28XX converters to match switching frequency of the converter to the frequency of the system clock, thus eliminating this type of noise. Device Synchronization W Eff P P out 5 9 1 76 1 30 1 1 . = ⎥⎦ ⎤ ⎢⎣ ⎡ − = ⎥⎦ ⎤ ⎢⎣ ⎡ − = ∆T = 80 A –0.7 P 0.85 (°C) ∆T = 80 (7.34)-0.7 (9.5)0.85 = 134°C () 2 43 1 85 0 9 22 34 7 5 9 80 50 in A HEATSINK . . . . . = − ⎥ ⎥ ⎦ ⎤ ⎢ ⎢ ⎣ ⎡ = − Output Voltage Adjustment The output voltage of the ATR2805S converter can be adjusted upward by connecting an appropriate resistor value between the Positive Output (Pin 5) and the Positive Sense (Pin 6) as shown in Table 1 below. Resistance Pin 5 to 6 ( :) Output Voltage Increase (V) 109 0.1 240 0.2 400 0.3 600 0.4 857 0.5 1200 0.6 Table1 Output adjustment resistor values for ATR2805S 5 4 +Vout Output Return Pulse Width Modulator Primary Housekeeping Supply EMI Filter 1 10 +Input Inhibit Input Sync Input Return Error Amp & Ref +Sense Sense Return FB CS Drive Case 6 3 9 8 2 |
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