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SP6122EB Datasheet(PDF) 3 Page - Sipex Corporation |
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SP6122EB Datasheet(HTML) 3 Page - Sipex Corporation |
3 / 6 page Rev. 5/23/01 SP6122 Evaluation Board Manual © Copyright 2001 Sipex Corporation 3 SP612 Evaluation Board Divider Resistors: The values of R1 and R2 are selected to program 1.9V output, with 1.5V trim voltage Vb, and R1 = 500ohm: i3 = (Vout-Vb)/R1=(1.9-1.5)/500 = 800uA. The external voltage divider will add only 800uA to the load. Divider Resistor R2 is: R2 = Vb/(i3-i1)=1.5/(800uA-20uA) = 1.9K The user of the SP6122 Evaluation Board can use the above equations for i3 and R2 to modify R2 and change the output voltage to be any voltage from Vb (1.5V) to as high as the input voltage. And if you want the output voltage to be the preset voltage Vb (1.5V), just short a wire across R1. Figure 1. Schematic: Output Voltage Divider Resistors POWER SUPPLY DATA The SP6122 is engineered for size and minimum pin count, yet has a very accurate 1.5% reference over line, load and temperature. Figure 2 data shows a typical SP6122 Evaluation Board Efficiency plot, with efficiencies to 88% and output currents to 4A. Load Regulation plot in Figure 3 shows an essentially flat response of only 3mV change for up to 4A load. Figure 4 Line Regulation illustrates a 1.90V output that varies only 4mV or 0.2% for an input voltage change from 3.3V to 5.5V. While data on individual power supply boards may vary, the capability of the SP6122 of achieving high accuracy over load and line shown here is quite impressive and desirable for accurate power supply design. Vout Rin1 Rin2 62.5K R1 500 R2 + - Error Amplifier + - 1.25 SP6122 i1 i3 i2 Va Vb Pin3 1.9K |
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