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SE5117ASG Datasheet(PDF) 4 Page - Estek Electronics Co. Ltd |
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SE5117ASG Datasheet(HTML) 4 Page - Estek Electronics Co. Ltd |
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4 / 6 page  Application Hints Thermal Consideration SE5117 Like any Low dropout regulator, SE5117 requires external capacitors to ensure stability. The external capacitors must be carefully selected to ensure the performances. Input Capacitor: An Input Capacitor of at least 10uF is required. Ceramic or Tantalum can be used. The value can be increased without upper limit. It is important that the thermal limit of the package should not be exceeded. The SE5117 has built-in thermal protection. When the thermal limit is exceeded, the IC will enter protection, and the VOUT will be reset to zero. The power dissipation for a given application can be calculated as follows: The Power Dissipation (PD) is PD = IOUT * [VIN –VOUT] Output Capacitor: An Output Capacitor is required for look stability. It must be located no more than 1cm away from the VOUT pin, and connected directly between VOUT and GND pins. The minimum value is 10uF but once again its value can be increased without limit. The thermal limit of the package is then limited to PD(MAX) = [TJ –TA]/θJA where TJ is the junction temperature, TA is ambient temperature, and θJA is around 135°C/W for SE5117. SE5117 is designed to enter thermal protection at 150°C. For example, if TA is 25°C then the max PD is limited to about 1W. In other words, if IOUT(MAX) = 1A, then [VIN –VOUT] can not exceed 1V. 4 BEIJING ESTEK ELECTRONICS CO.,LTD |
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