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APL111750FC-TUG Datasheet(PDF) 9 Page - Anpec Electronics Coropration |
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APL111750FC-TUG Datasheet(HTML) 9 Page - Anpec Electronics Coropration |
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9 / 19 page  Copyright © ANPEC Electronics Corp. Rev. C.10 - Sep., 2010 APL1117 www.anpec.com.tw 9 Application Information V IN APL1117 OUT IN ADJ VREF R1 R2 V OUT IADJ 60 µA VOUT = VREF(1+ )+IADJR2 R2 R1 Figure 1. Basic Adjustable Regulator Output Voltage The APL1117 develops a 1.25V reference voltage between the output and the adjust terminal. By placing a resistor between these two terminals, a constant Current is caused to flow through R1 and down through R2 to set the overall output voltage. Normally, this current is chosen to be the specified minimum load current of 10mA. For fixed volt- age devices R1 and R2 are included in the device. Load Regulation When the adjustable regulator is used, load regulation will be limited by the resistance of the wire connecting the regulator to the load. The data sheet specification for load regulation is measured at the output pin of the device. Best load regulation is obtained when the top of the re- sistor divider (R1) is tied directly to the output pin of the device not to the load. For fixed voltage, devices the top of R1 is internally connected to the output, and the ground pin can be connected to low side of the load. If R1 is connected to the load, R P is multiplied by the divider ratio, the effective resistance between the regulator and the load would be: Figure 2. Connections for Best Load Regulation Input Capacitor An input capacitor of 10 µF or greater is recommended. Tantalum or aluminum electrolytic capacitors can be used for bypassing. Larger Values will improve ripple rejection by bypassing the input to the regulator. Output Capacitor The APL1117 requires an output capacitor to maintain sta- bility and improve transient response. Proper capacitor selection is important to ensure proper operation. The APL1117 output capacitor selection is dependent upon the ESR (equivalent series resistance) of the output ca- pacitor to maintain stability. When the output capacitor is 10 µF or greater, the output capacitor should have an ESR less than 1 Ω. This will improve transient response as well as promote stability. A low-ESR solid tantalum ca- pacitor works extremely well and provides good transient response and stability over temperature. Aluminum electrolytics can also be used, as long as the ESR of the capacitor is <1 Ω. The value of the output ca- pacitor can be increased without limit. Higher capacitance values help to improve transient response and ripple re- jection and reduce output noise. Rp X (1+ ), Rp = Parasitic Line Resistance R2 R1 V IN APL1117 OUT IN ADJ R1 R2 Rp PARASITIC LINE RESISTANCE CONNECT R1 TO CASE CONNECT R2 TO LOAD RL |
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