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SE5167CHG-LF Datasheet(PDF) 6 Page - Seaward Electronics Inc. |
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SE5167CHG-LF Datasheet(HTML) 6 Page - Seaward Electronics Inc. |
6 / 8 page Revision 1/4/2010 Preliminary and all contents are subject to change without prior notice. © Seaward Electronics, Inc., 2006. • www.seawardinc.com.cn • Page 6 Application Hints Like any Low dropout regulator, SE5167 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 2.2uF is required. The inexpensive Electrolytic capacitor is preferred. The value can be increased without upper limit. 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 inexpensive Electrolytic capacitor is recommended. The minimum value is 2.2uF but once again its value can be increased without limit. Thermal Consideration It is important that the thermal limit of the package should not be exceeded. The SE5167 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] 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 250°C/W for SE5167. SE5167 is designed to enter thermal protection at 150°C. For example, if TA is 25°C then the max PD is limited to about 0.5W. In other words, if IOUT(MAX) = 300mA, then [VIN – VOUT] can not exceed 1.67V. |
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