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APL5910KAI-TRG Datasheet(PDF) 11 Page - Anpec Electronics Coropration |
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APL5910KAI-TRG Datasheet(HTML) 11 Page - Anpec Electronics Coropration |
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11 / 16 page  Copyright © ANPEC Electronics Corp. Rev. A.2 - Aug., 2008 APL5910 www.anpec.com.tw 11 Application Information ........... (V) Power Sequencing The power sequencing of VIN and VCNTL is not neces- sary to be concerned. However, do not apply a voltage to VOUT for a long time when the main voltage applied at VIN is not present. The reason is the internal parasitic diode from VOUT to VIN conducts and dissipates power without protections due to the forward-voltage. Output Capacitor The APL5910 requires a proper output capacitor to main- tain stability and improve transient response. The output capacitor selection is dependent upon ESR (equivalent series resistance) and capacitance of the output capacitor over the operating temperature. Ultra-low-ESR capacitors (such as ceramic chip capacitors) and low-ESR bulk capacitors (such as solid tantalum, POSCap, and Aluminum electrolytic capacitors) can all be used as output capacitors. During load transients, the output capacitors which is de- pending on the stepping amplitude and slew rate of load current, are used to reduce the slew rate of the current seen by the APL5910 and help the device to minimize the variations of output voltage for good transient response. For the applications with large stepping load current, the low-ESR bulk capacitors are normally recommended. Decoupling ceramic capacitors must be placed at the load and ground pins as close as possible and the imped- ance of the layout must be minimized. Input Capacitor The APL5910 requires proper input capacitors to supply current surge during stepping load transients to prevent the input voltage rail from dropping. Because the para- sitic inductor from the voltage sources or other bulk ca- pacitors to the VIN pin limits the slew rate of the surge currents, more parasitic inductance needs, more input capacitance. Ultra-low-ESR capacitors (such as ceramic chip capacitors) and low-ESR bulk capacitors (such as solid tantalum, POSCap, and Aluminum electrolytic capacitors can all be used as an input capacitor of VIN. For most applications, the recommended input capacitance of VIN is 10 µF at least. However, if the drop of the input voltage is not cared, the input capacitance can be less than 10 µF. Setting The Output Voltage The output voltage is programmed by the resistor divider connected to FB pin. The preset output voltage is calcu- lated by the following equation : + ⋅ = R2 R1 1 0.8 VOUT where R1 is the resistor connected from VOUT to FB with Kelvin sensing connection and R2 is the resistor con- nected from FB to GND. A bypass capacitor (C1) may be connected with R1 in parallel to improve load transient response and stability. More capacitance reduces the variations of the supply voltage on VIN pin. |
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