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IRU1010CD Datasheet(PDF) 5 Page - International Rectifier |
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IRU1010CD Datasheet(HTML) 5 Page - International Rectifier |
5 / 10 page IRU1010 5 Rev. 1.7 02/03/03 www.irf.com Assuming the following specifications: Where: VF is the forward voltage drop of the D1 diode as shown in Figure 5. The steps for selecting the right package with proper board area for heatsinking to keep the junction tempera- ture below 135 8C is given as: 1) Calculate the maximum power dissipation using: 2) Calculate the maximum θJA allowed for our example: 3) Select a package from the datasheet with lower θJA than the one calculated in the previous step. Selecting TO-252 (D-Pak) with at least 0.5" square of 0.062" FR4 board using 1 oz. copper has 70 °C/W which is lower than the calculated number. To set the output DC voltage, we need to select R1 and R2: 4) Assuming R1 = 121 V, 1%: Select R2 = 154 V, 1%. Figure 5 - Final Schematic for half of the GTL+ termination regulator. Layout Consideration The output capacitors must be located as close to the VOUT terminal of the device as possible. It is recom- mended to use a section of a layer of the PC board as a plane to connect the VOUT pin to the output capacitors to prevent any high frequency oscillation that may result due to excessive trace inductance. VIN = 5V VF = 0.5V VOUT = 2.85V IOUT(MAX) = 0.8A TA = 35 8C uJA(MAX) = = = 75.6 8C/W TJ - TA PD 135 - 35 1.32 PD = IOUT 3 (VIN - VF - VOUT) PD = 0.8 3 (5 - 0.5 - 2.85) = 1.32W R2 = 3R1 = 3121 = 154.8V ( ) ( ) VOUT VREF -1 2.85 1.25 -1 IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 TAC Fax: (310) 252-7903 Visit us at www.irf.com for sales contact information Data and specifications subject to change without notice. 02/01 2.85V R1 121 1% R2 154 1% 5V C2 22uF C1 10uF IRU1010 Adj VOUT VIN D1 |
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