wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 141
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wm8351
Manufacturer Part Number
wm8351
Description
Wolfson Audioplus? Stereo Codec With Power Management
Manufacturer
Wolfson Microelectronics plc
Datasheet
1.WM8351.pdf
(328 pages)
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14.8.3
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 1.024MHz 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 29.3 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 29.3 for details of the recommended external components.
DC-DC STEP UP CONVERTER
PD, June 2009, Rev 4.1
WM8351
141
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