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L11815AL-XX-TQ2-X-T Datasheet(PDF) 4 Page - Unisonic Technologies |
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L11815AL-XX-TQ2-X-T Datasheet(HTML) 4 Page - Unisonic Technologies |
4 / 4 page L11815A CMOS IC UNISONICTECHNOLOGIESCO.,LTD 4 of 4 www.unisonic.com.tw QW-R502-346.F DETAILED DESCRIPATION The UTC L11815A of CMOS regulators insist of a PMOS pass transistor, voltage reference, error amplifier, over-current protection, and thermal shutdown. The error amplifier, over-current shutdown, and thermal protection circuits provides data for P-channel pass transistor. The error amplifier takes output voltage for a precision reference in the normal operation and the normal operation is restored when the junction temperature drops below 120°C.Over-current and Thermal shutdown circuits start to work when the junction temperature is higher than 150 °C, or the current exceeds 2.2A. The output voltage stays low when the thermal shutdown is in active. The UTC L11815A behaves like a current source when the load reaches 2.2A. But the current would fall back to 600mA to prevent excessive power loss when the load impedance value is below 0.3Ω.Normal operation is restored when the load resistance value is higher than 0.75 Ω. EXTERNAL CAPACITORS The UTC L11815A has an output capacitor to ground of 4.7μF or more in the stable operation. Ceramic capacitors can provide the lowest ESR with the best AC performance. Aluminum Electrolytic capacitors, in contrast, have the highest ESR with poorest AC response. Unfortunately, large value ceramic capacitors are comparatively expensive. So we can parallel a 0.1μF ceramic capacitor with a 10μF Aluminum Electrolytic. The result is low ESR, high capacitance, and low overall cost. A second capacitor is recommended between the input and ground to stabilize input voltage. To get an ideal effect the value of the input capacitor should be at least 0.1μF. All capacitors should be placed in close proximity to the pins. This can be achieved with a star connection. TYPICAL APPLICATION CIRCUIT L11815A GND VIN VOUT VIN VOUT C1=1µF C2=4.7µF UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. |
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