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APL1541-33KC-TR Datasheet(PDF) 8 Page - Anpec Electronics Coropration |
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APL1541-33KC-TR Datasheet(HTML) 8 Page - Anpec Electronics Coropration |
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8 / 13 page  Copyright ANPEC Electronics Corp. Rev. A.2 - Oct., 2003 APL1541 www.anpec.com.tw 8 Application Information Output Voltage The APL1541 develops a 1.25V reference voltage be- tween 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 voltage devices R1 and R2 are included in the device. V IN APL1541 OUT IN ADJ VREF R1 R2 V OUT IADJ 60 µA Figure 1. Basic Adjustable Regulator V OUT = V REF(1+ )+IADJR2 R2 R1 Load Regulation When the adjustable regulator is used. Load regula- tion will be limited by the resistance of the wire con- necting the regulator to the load. The data sheet speci- fication for load regulation is measured at the output pin of the device. Best load regulation is obtained when the top of the resistor 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 con- nected to the output, and the ground pin can be con- nected to low side of the load. If R1 were connected to the load, RP is multiplied by the divider ratio, the effective resistance between the regulator and the load would be: Rp X (1+ ), Rp = Parasitic Line Resistance R2 R1 V IN A P L1541 OU T IN AD J R1 R2 Rp P A R A S IT IC L INE RE S IS T A N C E CO NN E C T R 1 T O C ASE CO NN E C T R2 T O L O A D R L 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 APL1541 requires an output capacitor to main- tain stability and improve transient response. Proper capacitor selection is important to ensure proper operation. The APL1541 output capacitor selection is dependent upon the ESR (equivalent series resistance) of the output capacitor to maintain stability. When the output capacitor is 10uF or greater, the out- put capacitor should have an ESR less than 1 Ω.This will improve transient response as well as promote stability. A low-ESR solid tantalum capacitor works extremely well and provides good transient response and stability over temperature. |
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