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APL111718FC-TUG Datasheet(PDF) 10 Page - Anpec Electronics Coropration |
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APL111718FC-TUG Datasheet(HTML) 10 Page - Anpec Electronics Coropration |
10 / 19 page Copyright © ANPEC Electronics Corp. Rev. C.10 - Sep., 2010 APL1117 www.anpec.com.tw 10 Application Information (Cont.) Thermal Consideration The APL1117 regulators have thermal protection to limit junction temperature to 150ºC. However, the device is recommended to be operated under 125ºC. A heatsink may be required depending on the maximum power dissipation and maximum ambient temperature of the application. Figure 3&4 show for the TO-252-3 and SOT-223 the measured values θ (J-A) for different copper area sizes using a 2 layers, 1.6mm, and 6Sq. cm FR-4 PCB with 2oz. copper and a ground plane layer on the backside area used for heatsinking. It can be used as a rough guideline in estimating thermal resistance. Both the TO-252-3 and SOT-223 packages use a copper plane on the PCB and the PCB itself as a heatsink. To optimize the heat sinking ability of the plane and PCB, solder the tab of the package to the plane. Top Copper Area (cm2) Figure 3. θ (J-A) vs. copper area for the TO-252-3 package Top Copper Area (cm2) Figure 4. θ (J-A) vs. copper area for the SOT-223 package The thermal resistance for each application will be af- fected by thermal interactions with other components on the board. Some experimentation will be necessary to determine the actual value. The power dissipation of APL1117 is equal to: P D = (VIN - VOUT) x IOUT Maximum junction temperature is equal to: T JUNCTION (Note) = T AMBIENT + (PD x θJA) Note: T JUNCTION must not exceed 125°C The curves for Ripple Rejection were generated using an adjustable device with the adjust pin bypassed. With a 22 µF bypassing capacitor, 75dB ripple rejection is ob- tainable at any output level. The impedance of the adjust pin capacitor, at the ripple frequency, should be < R1. R1 is normally in the range of 100 Ω to 200Ω. The size of the required adjust pin capacitor is the function of the input ripple frequency. At 120Hz, with R1=100 Ω, the adjust pin capacitor should be 13 µF. For fixed voltage devices and adjustable devices without an adjust pin capacitor, the output ripple will increase as the ratio of the output volt- age to the reference voltage (VOUT /VREF ). Ripple Rejection 0 2 4 6 8 10 12 14 T A=25 oC 25 30 35 40 45 50 0 2 4 6 8 10 12 14 30 35 40 45 50 55 60 T A=25 oC Safe Operation Area Using the experiment result of previous Thermal Con- sideration (choose the one with 1.5cmx1.5cm polygen area) and θ (J-A)=50°C/W spec, the safe operation area of APL1117 in TO-252-3 and SOT-223 packages can be ob- tained as Figure 5. Figure 5. Safe Operation Area of APL1117 in TO-252-3 and SOT-223 packages (limited by Power Dissipation with T JUNCTION < 125°C) 0.851 1.31.45 1.75 2.05 2.35 2.65 2.953.1 Input-Output Voltage Differential (V) T A=85 oC T A=55 oC T A=25 oC 0 200 400 600 800 1000 1200 |
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