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APL1581FC-TRL Datasheet(PDF) 9 Page - Anpec Electronics Coropration |
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APL1581FC-TRL Datasheet(HTML) 9 Page - Anpec Electronics Coropration |
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9 / 17 page  Copyright © ANPEC Electronics Corp. Rev. B.5 - Mar., 2008 APL1581 www.anpec.com.tw 9 Grounding and Output Sensing The APL1581 allows true Kelvin sensing for both the high and low side of the load. Figure 2 shows the de- vice connected to take advantage of the remote sense feature. The SENSE pin and the top of the resistor divider are connected to the top of the load; the bot- tom of the resistor divider is connected to the bottom of the load. Typically the load is a microprocessor and parasitic resistance RP is made up of the PC traces and /or connector resistance between the regulator and the processor. RP is now connectedinside the regulation loop of the APL1581 and for reasonable val- ues of RP the load regulation at the load will be negligible. Voltage drops due to RP are not eliminated; they will add to the dropout voltage of the regulator VIN VCNTL VOUT VSENSE VOUT VIN VCNTL ADJ IADJ=50uA APL1581 R1 R2 VREF Figure 1 Setting Output Voltage VIN VCNTL VOUT VSENSE VOUT VIN VCNTL ADJ IADJ=50uA APL1581 R1 R2 VREF Figure 1 Setting Output Voltage grammable to any voltages in the range of 1.25V to 5.5V according to the following formula: VOUT = VREF x (1+ R1 R2 ) + IADJ x R2 where VREF = 1.25V (typical) IADJ = 50 µA (typical) The recommended R1 is in range of 100 Ω to125Ω to satisfy the minimum load current requirement. Proper sizes of R2 and R1 are also concerned for power dissipation. Application Information (Cont.) Output Voltage Setting (Cont.) regardless of whether they are inside or outside the regulation loop. VIN VCN TL VOUT VSENSE VOUT VIN VCNTL ADJ APL1581 R1 R2 Load RP Adjustable Device Figure 2 Remote Voltage Sensing VIN VCN TL VOUT VSENSE VOUT VIN VCNTL GND APL1581 Load RP Fixed Voltage Device VIN VCN TL VOUT VSENSE VOUT VIN VCNTL ADJ APL1581 R1 R2 Load RP Adjustable Device Figure 2 Remote Voltage Sensing VIN VCN TL VOUT VSENSE VOUT VIN VCNTL GND APL1581 Load RP Fixed Voltage Device Stability and Output Capacitors The circuit design of using the APL1581 series re- quires an output capacitor as part of the device fre- quency compensation. The following chart shows a stable region to select output capacitor for APL1581. This region above the curve indicates minimum re- quired ESR and capacitance to maintain stability. However, the output capacitor should have an ESR less than1 Ω. 0 20 40 60 80 100 1 10 100 1000 Capacitance( µF) Stable Region 0 20 40 60 80 100 1 10 100 1000 Capacitance( µF) Stable Region |
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