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APE2901N-48 Datasheet(PDF) 3 Page - Advanced Power Electronics Corp. |
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APE2901N-48 Datasheet(HTML) 3 Page - Advanced Power Electronics Corp. |
3 / 10 page Advanced Power Electronics Corp. APE2901 BLOCK DIAGRAM OPERATION APPLICATION INFORMATION INPUT/OUTPUT CAPACITOR SELECTION INDUCTOR SELECTION 3 SW GND VFM CONTROL Driver VREF OUT ERROR AMP. LIMITER AMP. The APE2901 architecture is built around a VFM CONTROL logic core, switching frequency is set through a built in oscillator. TON time is fixed (Typ. 5uS) while TOFF time is determined by the error amplifier output, a logic signal coming from the comparison made by the Error Amplifier Stage between the signal coming from the output voltage divider network and the internal Band-Gap voltage reference (Vref). TOFF reaches a minimum (Typ. 1.7uS) when heavy load conditions are met (Clock frequency 150KHz). An over current conditions, through the internal power switch, causes a voltage drop VLX=RDSON x ISW and the VLX limiter block forces the internal switch to be off, so narrowing TON time and limiting internal power dissipation. In this case the switching frequency may be higher than the 150KHz set by the internal clock generator. VFM control ensures very low quiescent current and high conversion efficiency even with very light loads. Since the Output Voltage pin is also used as the device Supply Voltage, the versions with higher output voltage present an higher internal supply voltage that results in lower power switch RDSON, slightly greater output power and higher efficiency. Moreover, bootstrapping allows the input voltage to sag to 0.6V (at IOUT=1mA) once the system is started. If the input voltage exceeds the output voltage, the output will follow the input, however, the input or output voltage must not be forced above 5.5V. The Output Ripple Voltage, as well as the Efficiency, is strictly related to the behavior of these elements. The output ripple voltage is the product of the peak inductor current and the output capacitor Equivalent Series Resistance (ESR). Best performances are obtained with good high frequency characteristics capacitors and low ESR. The best compromise for the value of the Output Capacitance is 47µF Tantalum Capacitor; Lower values may cause higher Output Ripple Voltage and lower Efficiency without compromising the functionality of the device. An Input Capacitor is required to compensate, if present, the series impedance between the Supply Voltage Source and the Input Voltage of the Application. A 47µH inductor is recommended for most APE2901 applications. However, the inductance value is not critical, and the APE2901 will work with inductors in the 33µH to 120µH. |
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