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UCC3830DAC-4 Datasheet(PDF) 8 Page - Texas Instruments |
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UCC3830DAC-4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 10 page 8 UCC3830-4/-5/-6 Choosing the Input Capacitor The input capacitors are chosen primarily based on their switching frequency RMS current handling capability and their voltage rating. The input capacitors must handle virtually all of the RMS current at the switching fre- quency, even if the circuit does not have an input induc- tor. The switching current in the input capacitors appears as shown in Figure 5. The amount of RMS current in an Aluminum Electrolytic capacitor has a strong impact on the reliability and life- time of the capacitor. Other factors which affect the life of an input capacitor are internal heat rise, external air- flow, the amount of time that the circuit operates at maxi- mum current and the operating voltage. The curves in Figure 6 show the RMS current handled by the total input capacitance in typical VRM circuits delivering 1.8V to 2.8V and powered from 5V. Related Publications U-156 and U-157 are Unitrode Application Notes describ- ing the operation of the UC3886 and the UC3886/ UC3910 together in a Pentium® Pro application. Typical Application The UCC3830-x is ideal for converting the 5.0V system bus into the required Pentium® Pro bus voltage. The 3.3V system bus can also be converted using the UCC3830-x when the Pentium® Pro requires lower bus voltages. APPLICATION INFORMATION (cont.) Table I. Parts list. REFERENCE DESIGNATOR DESCRIPTION PACKAGE U1 Unitrode UCC3830DWP-5 DAC/PWM SOIC-20 Wide C1 Sanyo 6MV1500GX, 1500 µF, 6.3V, Aluminum Electrolytic 10x20mm Radial Can C2 Sanyo 6MV1500GX, 1500 µF, 6.3V, Aluminum Electrolytic 10x20mm Radial Can C3 Sanyo 6MV1500GX, 1500 µF, 6.3V, Aluminum Electrolytic 10x20mm Radial Can C4 Sanyo 6MV1500GX, 1500 µF, 6.3V, Aluminum Electrolytic 10x20mm Radial Can C5 Sprague/Vishay 595D475X0016A2B, 4.7 µF 16V Tantalum SPRAGUE Size A C6 Sanyo 6MV1500GX, 1500 µF, 6.3V, Aluminum Electrolytic 10x20mm Radial Can C7 Sanyo 6MV1500GX, 1500 µF, 6.3V, Aluminum Electrolytic 10x20mm Radial Can C8 Sanyo 6MV1500GX, 1500 µF, 6.3V, Aluminum Electrolytic 10x20mm Radial Can C9 Sanyo 6MV1500GX, 1500 µF, 6.3V, Aluminum Electrolytic 10x20mm Radial Can C10 Sanyo 6MV1500GX, 1500 µF, 6.3V, Aluminum Electrolytic 10x20mm Radial Can C11 Sprague 593D107X9010D2, 100 µF, 6.3V Tantalum EIA Size D SMD C12 0.10 µF Ceramic 1206 SMD C13 0.01 µF Ceramic 0603 SMD C14 0.01 µF Ceramic 0603 SMD C15 0.01 µF Ceramic 0603 SMD C16 1000pF Ceramic 0603 SMD C17 0.10 µF Ceramic 1206 SMD C18 33pF NPO Ceramic 0603 SMD C19 1500pF Ceramic 0603 SMD C20 82pF NPO Ceramic 0603 SMD C21 0.10 µF Ceramic 1206 SMD C22 0.10 µF Ceramic 1206 SMD CR1 International Rectifier 32CTQ030 30V, 30A Schottky Diode TO-220AB L1 Micrometals T50-52B, 10 Turns #16AWG, 4.5 µH Toroid |
Similar Part No. - UCC3830DAC-4 |
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Similar Description - UCC3830DAC-4 |
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