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ZXSC410E6TA Datasheet(PDF) 6 Page - Zetex Semiconductors |
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ZXSC410E6TA Datasheet(HTML) 6 Page - Zetex Semiconductors |
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6 / 12 page  Sense Resistor A low value sense resistor is required to set the peak current. Power in this resistor is negligible due to the low sense voltage threshold, VSENSE. Below is a table of recommended sense resistors: Output power calculation By making the above assumptions for inductance and peak current the output power can be determined by: POUT = IAV x VIN x = (Watts) where I I 2 X (T T (T T AV PK ON DIS ON OFF = + + ) ) and T Ix L V ON PK IN = and T Ix L V- V DIS PK OUT IN = and TOFF ≅ 1.7µs (internally set by ZXSC410) and = efficiency i.e. 100% = 1 Operating frequency can be derived by: F 1 TT ON OFF = + Output capacitors Output capacitors are a critical choice in the overall performance of the solution. They are required to filter the output and supply load transient currents. There are three parameters which are paramount in the selection of the output capacitors, capacitance, IRIPPLE and ESR. The capacitance value is selected to meet the load transient requirements. The capacitors IRIPPLE rating must meet or exceed the current ripple of the solution. The ESR of the output capacitor can also affect loop stability and transient performance. The capacitors selected for the solutions, and indicated in the reference designs, are optimised to provide the best overall performance. Input capacitors The input capacitor is chosen for its voltage and RMS current rating. The use of low ESR electrolitic or tantalum capacitors is recommended. Capacitor values for optimum performance are suggested in the reference design section Also note that the ESR of the input capcitor is effectively in series with the input and hence contributes to efficiency losses in the order of IRMS 2 . ESR. ZXSC410 ZXSC420 SEMICO NDUC TORS ISSUE 2 - May 2003 6 Manufacture Series RDC( ) Range Size Tolerance URL Cyntec RL1220 0.022 - 10 0805 ±5% http://www.cyntec.com IRC LR1206 0.010 - 1.0 1206 ±5% http://www.ictt.com |
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