wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 140
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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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WM8351
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14.8.2
DC-DC Converters 1, 3 and 4 are versatile step-down, pulse-width-modulated (PWM) DC-DC
converters designed to deliver high power efficiency across full load conditions. The converters offer
Active and Standby/Hysteretic operating modes in order to maximise efficiency for different loads. A
low-power LDO sleep mode is also available to further reduce quiescent current at very lightly loaded
conditions. The DC-DC Converters maintain output voltage regulation during the switch-over between
operating modes.
The step-down regulators are designed with fixed frequency current mode architecture. The current
feedback loop is through the PMOS current path and is amplified and summed with an internal slope
compensation network. The voltage feedback loop is through an internal feedback divider. The ON
time is determined by comparing the summed current feedback and the output of the switcher error
amplifier. The period is set by the internal RC oscillator, which provides a 2.048MHz clock.
A supply pin (PVDD) provides the core supply for DC-DC Converter 3. Another supply pin
(LINEDCDC) provides the core supply for DC-DC Converters 1 and 4. The input voltage connection
to DC-DC Converters 1, 3 and 4 is provided on PV1, PV3 and PV4 respectively. These input voltages
may be provided from the LINE voltage.
The connections to DC-DC Converter 1 are illustrated in Figure 69. The equivalent circuit applies to
DC-DC Converters 3 and 4 also.
Figure 69 Step-Down 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 transient response on DC-DC1. A single recommended value is provided for Cout on DC-
DC3 and DC-DC4.
See Section 29.2 for details of the recommended external components.
DC-DC STEP DOWN CONVERTERS
PD, June 2009, Rev 4.1
Production Data
140
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