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SP7661ER Datasheet(PDF) 3 Page - Sipex Corporation |
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SP7661ER Datasheet(HTML) 3 Page - Sipex Corporation |
3 / 11 page Feb21-07 SP7661 Evaluation Manual ©2007 Sipex Corporation Page 3 of 11 Adjusting the current downwards is controlled by adjusting R8. ⋅ ⋅ + ⋅ = DCR) (Imax - 60mV DCR) (Imax 60mV) - (Vout R4 R8 Equation 3 Where DCR is the Inductor winding resistance and IMAX is the desired output current Further details on the current limit can be found in the SP7661 data sheet. For the Wurth Inductor on this demo board, DCR= 14m Ω nominal. POWER SUPPLY DATA The SP7661ER is designed with an accurate 2.0% reference over line, load and temperature. Figure 1 data shows a typical SP7661 evaluation board efficiency plot, with efficiencies up to 90% and output currents up to 3A. The output voltage ripple of less than 10mV at full load and the LX node are shown in figure 2. Figures 3 and 4 illustrate a 0A to 3A and 1A to 3A Load Step. Short circuit and current limit are shown in Figures 5 and 6. Typical startup characteristics into a full load and no load are shown in figure 7 and 8. All data was taken at 12VIN. While data on individual power supply boards may vary, the capability of the SP7661ER of achieving high accuracy over a range of load conditions shown here is quite impressive and desirable for accurate power supply design. 7661 Efficiency 12Vin, 3.3Vout, 3Amps 50.0 55.0 60.0 65.0 70.0 75.0 80.0 85.0 90.0 95.0 0.51 1.52 2.53 Iout (Amps) Figure 1. Efficiency vs. Load |
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