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AME1117ACCT Datasheet(PDF) 9 Page - Analog Microelectronics |
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AME1117ACCT Datasheet(HTML) 9 Page - Analog Microelectronics |
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9 / 15 page  Analog Microelectronics, Inc. 9 AME1117 1A Low Dropout Positive Voltage Regulator n n n n n Application Descriptions Like most regulators, the AME1117 regulates the output by comparing the output voltage to an inter- nally generated reference voltage. On the adjust- able version, the V REF is available externally as 1.25V between V OUT and ADJ. The voltage ratio formed by R1 and R2 should be set to conduct 10mA (minimum output load). The output voltage is given by the following equation: 1. Output voltage adjustment V OUT = VREF (1+ R2 R1 ) + IADJ x R2 On fixed versions of AME1117, the voltage divider is provided internally. Figure 4 2. Thermal protection AME1117 has thermal protection which limits junction temperature to 150OC. However, device functionality is only guaranteed to a maximum junction temperature of +125OC. The power dissipation and junction temperature for AME1117 in DPAK package are given by P D = (VIN - VOUT) x IOUT T JUNCTION = TAMBIENT + ( PD x θJA) Note: T JUNCTION must not exceed 125 O C 3. Current Limit Protection AME1117 is protected against overload conditions. Current protection is triggered at typically 1.5A. AME1117 requires a capacitor from VOUT to GND to provide compensation feedback to the internal gain stage. This is to ensure stability at the output terminal. Typically, a 10 µF tantalum or 50µF alu- minum electrolytic is sufficient. Note: It is important that the ESR for this capacitor does not exceed 0.5 Ω. The output capacitor does not have a theoretical upper limit and increasing its value will increase stability. C OUT = 100µF or more is typical for high current regulator design. For the adjustable version, the best load regulation is accomplished when the top of the resistor di- vider (R1) is connected directly to the output pin of the AME1117. When so connected, RP is not mul- tiplied by the divider ratio. For fixed output versions, the top of R1 is internally connected to the output. The ground pin can be connected to the low side of the load in order to eliminate ground loop errors. 4. Stability and Load Regulation Figure 5 C 1 V OUT = V REF (1+ R2 R1 ) + I ADJ x R2 OUT ADJ IN V REF I AD J 50 µA V IN V OUT R1 R2 OUT ADJ IN V IN R1 R2 R L R P Parasitic Line Resistance Connect R2 to load (Connect R1 to case) |
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