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WM8351 Datasheet(PDF) 141 Page - Wolfson Microelectronics plc |
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WM8351 Datasheet(HTML) 141 Page - Wolfson Microelectronics plc |
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141 / 330 page  Production Data WM8351 w PD, April 2012, Rev 4.5 141 14.8.3 DC-DC STEP UP CONVERTER DC-DC Converter 2 is a versatile step-up pulse-width-modulated (PWM) DC-DC converter designed to deliver high power efficiency across full load conditions. The converter can also be used as a switch. DC-DC Converter 2 is designed with a fixed frequency current mode architecture. The clock frequency is set by the internal RC oscillator, which provides a 1.0MHz clock. The PVDD supply pin provides the core supply for DC-DC Converter 2. The connections to DC-DC Converter 2 in Constant Voltage Mode are illustrated in Figure 70. See Section 29.4 for details of the connections for the Constant Current and USB operating modes of the DC-DC Step-Up Converter. Figure 70 Step-Up DC-DC Converter Connections The external components at the converter output are required by the DC-DC Converter integral loop compensation circuit. Note that the recommended output capacitor Cout varies according to the required output voltage. See Section 29.4 for details of the recommended external components. |
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