PAC5220 Datasheet, PDF (21/73 Pages) Active-Semi, Inc – Power Application Controller

PAC5220
Power Application Controller
reconfigured to be 5V, 12V, or 15V by the microcontroller after initialization. When VP is lower than the target
regulation voltage, the internal feedback control circuitry causes the inductor current to increase to raise V P.
Conversely, when VP is higher than the regulation voltage, the feedback loop control causes the inductor current
to decrease to lower VP. The feedback loop is internally stabilized. The output current capability of the switching
supply is determined by the external current sense resistor. In the high-side current sense buck mode, the
inductor current signal is sensed differentially between the CSM pin and VP, and has a peak current limit
threshold of 0.26V. In the low-side current sense flyback or boost mode, the inductor current signal is sensed
differentially between the CSM pin and VSSP, and has a peak current limit threshold of 1V.
The MMSS controller is flexible and configurable as a buck, flyback, or boost converter. Input sources include
battery supply for buck mode (Figure 10-2), and AC line supply voltage range for ultra-high-voltage buck mode
(Figure 10-3), AC/DC flyback mode(Figure10-4). The MMSS controller operational mode is determined by
external configuration and register setting from the microcontroller after power up. It can operate in either high-
side or low-side current sense mode, and does not require external feedback loop compensation circuitry. For
optional extended application range, the MMSS also incorporates additional digital control by the microcontroller
to add accurate computations for outer feedback loop control such as power factor correction and accurate
current control.
Figure 10-2. Buck Mode
VHM
PAC52x2x0
DRM
CSM
VP
V
IN
V (12V typical)
P
Figure 10-3. Ultra-High-Voltage Buck Mode
VHM
PAC5220
DRM
CSM
VP
V (120V/230V)
AC
V (12V typical)
P
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Rev 1.0‒February 25, 2014