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AME1084CCBT Datasheet(PDF) 6 Page - Analog Microelectronics |
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AME1084CCBT Datasheet(HTML) 6 Page - Analog Microelectronics |
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6 / 16 page  Analog Microelectronics, Inc. 6 AME1084 5A Low Dropout Positive Voltage Regulator n n n n n Application Description 1. Output voltage adjustment Like most regulators, the AME1084 regulates the output by comparing the output voltage to an internally generated reference voltage. On the adjustable version, the VREF is available ex- ternally 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: V OUT = VREF ( 1 + ) + I ADJ x R2 On fixed versions of AME1084, the voltage di- vider is provided internally. R2 R1 Figure 3 3. Current limit protection AME1084 is protected against overload conditions. Current protection is triggered at typical 7.5A. 4. Stability and load regulation AME1084 requires a capacitor from VOUT to GND t o provide compensation feedback to the internal gain stage. This is to ensure stability at the output termi- nal. Typically, a 10 µF tantalum or 50µF aluminum electrolytic is sufficient. Note: It is important that the ESR for this capacitor does not exceed 0.5 Ω. The output capacitor dose not have a theoretical upper limit and increasing its value will increase stability. COUT = 100 µF or more is typical for high cur- rent regulator design. For the adjustable version, the best load regulation is accomplished when the top of theresistor divider (R1) is connected directly to theoutput pin of the AME1084. When so connected, R P is not multiplied by the divider ratio. For fixed output versions, the top of R1 is internally connected to the output. The ground pin can be con- nected to low side of the load to eliminate ground loop errors. 2. Thermal protection AME1084 has thermal protection which limits junction temperature to 150OC. However, de- vice functionality is only guaranteed to a maxi- mum junction temperature of +125OC. The power dissipation and junction tempera- ture for AME1084 in TO-220 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 Figure 4 V OUT = VREF (1+ R2 R1 ) + I ADJ x R2 OUT ADJ IN V REF I AD J 50 µA V IN V OUT R1 R2 C 1 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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