PAC5250_17 Datasheet, PDF (20/70 Pages) Active-Semi, Inc – Power Application Controller

PAC5250
Power Application Controller
10. MULTI-MODE POWER MANAGER (MMPM)
10.1. Features
 Multi-mode switching supply controller configurable as high voltage or ultra-high-voltage buck, flyback AC/DC
 DC supply up to 52V or line AC input
 4 linear regulators with power and hibernate management
 Power and temperature monitor, warning, and fault detection
10.2. Block Diagram
Figure 10-1. Multi-Mode Power Manager
MULTI-MODE POWER MANAGER
MULTI-MODE SWITCHING
SUPPLY CONTROLLER
COMP &
CURR LIMIT
START UP &
MODE CTRL
CLAMP
1.2V
ERROR
VP
VOLTAGE
SETTING
AMP
ERROR
PWM
LOGIC
DRIVER
COMP
POWER
OK & OVP
IMOD
DAC
CURR
SENSE
VHM
DRM
VSSP
CSM
REGO
VSYS
SYSTEM
SUPPLY
REG
LINEAR
REG
LINEAR
REG
LINEAR
REG
TIMERS
2.5V V
REF
HIBERNATE
V
THREF
POWER
& TEMP
MON
V
MON
V
TEMP
VCCIO
VCC33
VCC18
VSSA
VSS
10.3. Functional Description
The Multi-Mode Power Manager (Figure 10-1) is optimized to efficiently provide "all-in-one" power management required
by the PAC and associated application circuitry from a wide range of input power sources. It incorporates a dedicated multi-
mode switching supply (MMSS) controller operable as a buck, flyback, or boost converter to efficiently convert power
from a DC or AC input source to generate a main supply output VP. Four linear regulators provide VSYS, VCCIO, VCC33, and
VCC18 supplies for 5V system, 5V or 3.3V I/O, 3.3V mixed signal, and 1.8V microcontroller core circuitry. The power
manager also handles system functions including internal reference generation, timers, hibernate mode management, and
power and temperature monitoring.
10.3.1. Multi-Mode Switching Supply (MMSS) Controller
The MMSS controller drives an external power transistor for pulse-width modulation switching of an inductor or
transformer for power conversion. The DRM output drives the gate of the n-channel MOSFET or the base of the NPN
between the VHM on state and VSSP off state at proper duty cycle and switching frequency to ensure that the main supply
voltage VP is regulated. The VP regulation voltage is initially set to 12V during start up, and can be reconfigured to be 5V,
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Rev 1.7‒April 15, 2016