PAC5220 datasheet(21/73 Pages) ACTIVE-SEMI

21 / 73 page

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 VP.

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.

- 21 -

Rev 1.0‒February 25, 2014

Figure 10-2. Buck Mode

VHM

DRM

CSM

PAC52xx

(12V typical)

VHM

DRM

CSM

PAC5220

(12V typical)

Figure 10-3. Ultra-High-Voltage Buck Mode

VHM

DRM

CSM

PAC5220

(12V typical)

(120V/230V)

PAC5220 Datasheet(PDF) 21 Page - Active-Semi, Inc