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IRU1502-33CH Datasheet(PDF) 8 Page - International Rectifier |
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IRU1502-33CH Datasheet(HTML) 8 Page - International Rectifier |
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8 / 11 page  IRU1502-33 8 Rev. 1.0 07/17/03 www.irf.com APPLICATION INFORMATION Introduction The IRU1502-33 regulator is a 3-terminal device offered in a fixed output of 3.3V and it is designed specifically to provide an extremely low dropout voltage. The IRU1502-33 is designed to meet the fast current transient needs as well as providing an accurate initial voltage, reducing the overall system cost with the need for fewer number of output capacitors. Thermal Protection When the junction temperature exceeds 135 8C, the in- ternal thermal protection shuts the IRU1502-33 down. Current Limit Protection The IRU1502-33 provides Over Current Protection when the output current exceeds typically 1.4A. The output decreases to limit the power dissipation. Stability The IRU1502-33 requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. A minimum input capacitance of 4.7 mF and a minimum output capacitance 4.7mF Ce- ramic capacitor is needed for regulator stage as well as the specified minimum loads to guarantee stability. Transient Response and PSRR The input and output capacitors are critical in order to ensure good transient response and PSRR. The most important aspects of this are capacitor selection, place- ment and trace routing. Place each capacitor as close as physically possible to its corresponding regulator pin. Use wide traces for a low inductance path. Couple di- rectly to the ground and power planes as possible. The use of low ESR capacitors is crucial to achieving good results. Larger capacitance and lower ESR will improve both PSRR and transient response. Thermal Design The IRU1502-33 incorporates an internal thermal shut- down that protects the device when the junction tem- perature exceeds the allowable maximum junction tem- perature. Although this device can operate with junction temperatures in the range of 150 8C, it is recommended that the selected heat sink be chosen such that during maximum continuous load operation the junction tem- perature is kept below 125 8C. The following shows the typical thermal design. Figure 17 - Thermal resistor diagram for IRU1502-33. Where: ΘJC is the thermal resistance from junction to case. ΘCH is the thermal resistance from case to heat sink if applicable. ΘHA is the thermal resistance from heat sink to am- bient. ΘJA(through plastic cover)is the thermal resistance from junc- tion to the ambient through plastic cover. Typically it is very large and can be neglected. Therefore, over- all junction-to-ambient thermal resistance can be rep- resented as: Where ΘJA is the junction to ambient thermal resistance. ΘJA ≅ ΘJC+ΘCH+ΘHA Power consumption Ambient Junction ΘJA(through plastic cover) ΘJC ΘCH ΘHA |
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