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UM15343S Datasheet(PDF) 8 Page - Union Semiconductor, Inc. |
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UM15343S Datasheet(HTML) 8 Page - Union Semiconductor, Inc. |
8 / 12 page ________________________________________________________________________ http://www.union-ic.com Rev.04 Feb.2014 8/12 UM153xx/UM154xx Typical Application Circuit GND VOUT VIN CIN 1 μF(Ceramic) COUT 1 μF(Ceramic) UM153xx GND VOUT VIN CIN 1 μF(Ceramic) COUT 1 μF(Ceramic) UM154xx EN off on Applications Information Output Capacitance and Transient Response The UM153xx/UM154xx series regulators are designed to be stable with a wide range of output capacitors. The ESR of the output capacitor affects stability, most notably with small capacitors. A minimum output capacitor of 1μF with an ESR of 0.3Ω or less is recommended to ensure stability. The device’s output transient response will be a function of output capacitance. Larger values of output capacitance decrease the peak deviations and provide improved transient response for larger load current changes. Extra consideration must be given to the use of ceramic capacitors. The X5R and X7R dielectrics result in more stable characteristics and are more suitable for use as the output capacitor. The X7R type has better stability across temperature, while the X5R is less expensive and is available in higher values. Thermal Protection Thermal protection disables the output when the junction temperature rises to approximately +160°C allowing the device to cool. When the junction temperature cools to approximately +140°C the output circuit is again enabled. |
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