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APE1911MP Datasheet(PDF) 4 Page - Advanced Power Electronics Corp. |
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APE1911MP Datasheet(HTML) 4 Page - Advanced Power Electronics Corp. |
4 / 9 page Advanced Power Electronics Corp. APE1911 FUNCTION DESCRIPTION PWM Control Setting the Output Voltage Table 1 Resistor select for output voltage setting Inductor Selection Input Capacitor Selection 4 The APE1911 consists of DC/DC converters that employ a pulse-width modulation (PWM) system. In converters of the APE1911, the pulse width varies in a range from 0 to 85%, according to the load current. The ripple voltage produced by the switching can easily be removed through a filter because the switching frequency remains constant. Therefore, these converters provide a low-ripple power over broad ranges of input voltage and load current. Application circuit item shows the basic application circuit with APE1911 adjustable output version. The external resistor sets the output voltage according to the following equation: For most designs, Low inductance values are physically smaller but require faster switching, which results in some efficiency loss. The inductor value can be derived from the following equation: VOUT = 1.0V x (1+R4/R3) L = [VIN x (VOUT-VIN)] / VOUT x ∆ IL x fLx Where is inductor Ripple Current. Large value inductors lower ripple current and small value inductors result in high ripple currents. Choose inductor ripple current approximately 15% of the maximum input current 2.4A, ∆IL=0.18A. The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple current to prevent core saturation (2.4A+0.18A). The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input capacitor impedance at the switching frequency shall be less than input source impedance to prevent high frequency switching current passing to the input. A low ESR input capacitor sized for maximum RMS current must be used. The capacitor voltage rating should be at least 1.5 times greater than the input voltage, and often much higher voltage ratings are needed to satisfy. VOUT 9V 12V 15V 18V L1 Value 18uH 22uH 25uH 33uH VOUT R3 R4 12V 1K 11K 15V1.3K18K 18V1.3K22K 24V1.3K30K 32V2.2K68K |
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