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SP619 データシート(PDF) 4 Page - Sipex Corporation |
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SP619 データシート(HTML) 4 Page - Sipex Corporation |
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4 / 7 page  Jul23-07 Rev K SP69 High Current Power Switch © 2007 Sipex Corporation 4 THEORy OF OPERATION The SP69 is a switch capable of handling up to 800mA of current. 7V capability al- lows the user to have a wide input voltage range that covers the typical Lithium bat- tery range as well as higher 5V input volt- age rails commonly found in USB power. The SP69 also can be used as a 3V or 5V power distribution switch. It is intended for power distribution applications where short circuits are likely to be encountered. Short circuit operation When the SP69 enters a short circuit con- dition, the switch is disabled. The output of the SP69 will not restart until the out- put impedance is greater than 15KΩ. The enable pin can be used to re-enable the SP69 into any load condition that is not a fault condition. Refer to the truth table on page 4 for more information on the differ- ent SP69 switch states. The typical deac- tivation time is about 2ms. Enable The enable pin allows easy control of the SP69. The enable pin should not be en- abled high prior to a voltage being pres- ent on the input of the device. The enable pin should not exceed the input voltage by more than 0.1V due to an internal ESD di- ode. Doing so will affect the operation of the SP69 and could damage the device. In a typical application an 80KΩ resistor to GND should be used on the enable pin. This resistor will pull the enable low when an enable signal is not present. This pre- vents the SP69 from falsely turning on. The enable pin can also be used to restart the part into a load condition that is high in current. Please refer to the truth table on page 4 for more details. Inrush Current The SP69 is a simple resistive switch. When the switch is turned on into a highly capacitive load there could be a significant inrush current that can be encountered. At 6 volts in, the inrush current was about 250mA into a 00µF capacitor. Output Voltage Rise Time The output voltage of the SP69 has an output capacitance dependency on the slope of Vout. A simple RC circuit is cre- ated when the switch is turned on. Equation 1 V(t)=Vo+Vin ( ( Rds(on) • Cout -t Where Vo is initial Voltage condition typi- cally 0V Vin is the input voltage Rds(on) is the switch resistance Cout is the output capacitance For 4.2V Vin and 00µF output capacitance we get about 150ns delay in figure 2. 4.17 3.33 2.5 1.67 0.83 0 0 0.33 0.67 1 1.33 1.67 2 time in uS VOUT This is comparable to actual measured value in figure 3. -e |
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