Configuring the PAC52XX Multi-Mode Power Manager - Active-Semi

APPLICATION NOTE
Configuring the PAC52XX
Multi-Mode Power Manager
Power Application Controller TM
Marc D Sousa
Director, PAC Applications and Systems
www.active-semi.com
Copyright © 2015 Active-Semi, Inc.
No portion of this document may be reproduced or reused in any form without Active-Semi’s prior written consent
Configuring the PAC52XX MMPM
Power Application Controller
Table of Contents
1 Overview .................................................................................................................................................... 3
2 Firmware Configuration .............................................................................................................................. 4
2.1 Disabling the DC/DC Controller ........................................................................................................... 4
2.2 Enabling the DC/DC Controller ........................................................................................................... 4
3 Buck Mode ................................................................................................................................................. 5
3.1 Block Diagram ..................................................................................................................................... 5
3.2 MMPM Configuration ........................................................................................................................... 5
3.3 Application Example ............................................................................................................................ 6
4 SEPIC Mode .............................................................................................................................................. 7
4.1 Block Diagram ..................................................................................................................................... 7
4.2 MMPM Configuration ........................................................................................................................... 7
4.3 Application Example ............................................................................................................................ 8
5 AC/DC Flyback Mode................................................................................................................................. 9
5.1 Block Diagram ..................................................................................................................................... 9
5.2 MMPM Configuration ........................................................................................................................... 9
5.3 Application Example .......................................................................................................................... 10
6 Recovering PAC52XX When DC/DC Disabled ........................................................................................ 11
6.1 Remove the Inductor ......................................................................................................................... 11
6.2 Short VHM to VP ............................................................................................................................... 11
6.3 Supply VP .......................................................................................................................................... 12
About Active-Semi....................................................................................................................................... 13
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Configuring the PAC52XX MMPM
Power Application Controller
1
OVERVIEW
TM
The family of Power Application Controller (PAC) is highly optimized for controlling and powering nextgeneration smart energy appliances, devices and equipment. The PAC family of controllers integrates
management of many system functions for these applications, including power management.
TM
Each device in the PAC52XX family of controllers contains a Multi-Mode Power Manager (MMPM). The
MMPM provides “all-in-one” efficient power management solutions for multiple types of power sources.
The MMPM integrates control for a switching power supply that can support buck, SEPIC or AC/DC
Flyback modes up operation, as well as up to four linear regulated voltage supplies. In addition, the
switching power supply can also be disabled, if the application can power the IC directly.
The table below shows the PAC52XX family of devices, which voltage ranges are supported as well as
which converter topologies are supported.
Device
PAC5210
PAC5220
PAC5223
PAC5250
PAC5253
Input Voltage
(DC/DC disabled)
4.5V – 16V
4.5V – 16V
4.5V – 18V
4.5V – 16V
4.5V – 16V
DC/DC
X
X
X
X
X
Input Voltage
(DC/DC enabled)
5.2V – 52V
5.2V – 52V
5.2V – 72V
5.2V – 52V
5.2V – 52V
Buck
Boost
X
X
X
X
X
X
X
SEPIC
X
X
X
AC/DC
Flyback
X
X
X
X
X
This document shows examples of how to configure the firmware in the PAC52XX device to support the
DC/DC mode, as well as some application examples for each of the supported power topologies shown
above.
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Configuring the PAC52XX MMPM
Power Application Controller
2
FIRMWARE CONFIGURATION
The MMPM allows the user to configure the operational mode of the DC/DC converter via firmware on the
MCU in the PAC52XX. The MMPM allows the user to select if the DC/DC controller is enabled or
disabled. The administrative state of the DC/DC controller is selected by the SOC.PWRCFG.SMPSOFF
1
bit.
2.1
Disabling the DC/DC Controller
To disable the DC/DC controller, the MCU should set the SOC.PWRCFG.SMPSOFF bit to a 1. With this
configuration, the application must supply the PAC52XX on the VP pin.
The following code will set this bit, without changing any of the other fields:
reg_value = pac5xxx_file_register_read(0x15);
reg_value |= 0x20;
pac5xxx_tile_register_write(0x15, reg_value);
2.2
/* Read SOC.PWRCFG */
/* Set SMPSOFF bit to 1 */
/* Write SOC.PWRCFG */
Enabling the DC/DC Controller
To enable the DC/DC controller, the MCU should set the SOC.PWRCFG.SMPSOFF bit to a 0. When the
DC/DC controller is enabled, the VP output voltage is generated according to the setting of the
SOC.PWRCFG.VP field.
For example, in the PAC5223 the user may set the following VP output voltages:




5V (0)
9V (1)
12V (2)
15V (3)
The following code will clear the SOC.PWRCFG.SMPSOFF bit and set a VP output voltage of 15V
without changing any of the other fields:
reg_value = pac5xxx_file_register_read(0x15);
reg_value &= ~0x20;
reg_value |= 0xC0;
pac5xxx_tile_register_write(0x15, reg_value);
/*
/*
/*
/*
Read SOC.PWRCFG */
Set SMPSOFF bit to 0 */
Set VP to 3 (15V) */
Write SOC.PWRCFG */
Each of the supported DC/DC topologies will need to customize the firmware configuration of the MMPM.
See the sections below for more detail on each of these topologies.
1
The default value for the DC/DC controller is 0 (enabled)
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Configuring the PAC52XX MMPM
Power Application Controller
3
BUCK MODE
3.1
Block Diagram
The block diagram below shows how a DC/DC buck topology may be implemented with the PAC52XX.
3.2
MMPM Configuration
The Input Voltage is supplied on VHM and output is generated on VP.
The MMPM allows you to configure several parameters for the operation of the DC-DC:




VP output voltage
VHM clamp voltage
Switching frequency
Maximum duty cycle
The VP output voltage and Switching Frequency are dependent on the application, and inductor for the
power supply. For a buck mode DC-DC, the maximum duty cycle isn’t very important so any value may
be used.
To configure the MMPM for a buck mode DC-DC, the following configuration is recommended:




Set SOC.PWRSTATCFG.PWRUNLOCK to 1 to enable write access to SOC.SCFG and
SOC.PWRCFG
Set SOC.SCFG.VHMCLAMP to 0 to disable the VHM voltage clamp
Select the switching frequency by writing the SOC.SCFG.FMODE and SOC.SCFG.FSWM fields
to the appropriate values (see below)
Enable the DC-DC by setting the SOC.PWRCFG.SMPSOFF bit to a 0
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Configuring the PAC52XX MMPM
Power Application Controller

Select the output voltage of the DC-DC (VP) by writing the SOC.PWRCFG.VP value to the
appropriate value (see below)
The DC/DC switching frequency may be selected by the values shown in the table below.
FMODE
FSWM
0
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
1
Switching
Frequency
45kHz
50kHz
55kHz
62.5kHz
72.25kHz
82.5kHz
100kHz
125kHz
181kHz
200kHz
220kHz
250kHz
289kHz
330kHz
400kHz
500kHz
The VP output voltage may be selected from the SOC.PWRCFG.VP field as shown below.
VP
0
1
2
3
3.3
VP voltage setting
5V
9V
12V
15V
Application Example
A typical configuration for a DC-DC in buck mode would be:




Switching Frequency: 500kHz
MAXDUTY: Min off time: 500ns
VHM Voltage clamp disabled
VP output voltage: 12V
In order to configure the MMPM for the above configuration, the following code fragment may be used:
pac5xxx_tile_register_write(ADDR_PWRCTL, 0x40);
pac5xxx_tile_register_write(ADDR_PSTATSET, 0x80);
pac5xxx_tile_register_write(ADDR_SCFG, 0x3E);
pac5xxx_tile_register_write(ADDR_PWRCFG, 0x8E);
//
//
//
//
Set
Set
Set
Set
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MCUALIVE (indicate alive to in case of reset)
PWRUNLOCK bit to allow firmware to modify SCFG & PWRCFG
VCLAMPSEL, Fs=500kHz, DMAX=500ns
DC/DC enabled, VP=12V, VCC18, TON, TRESET, VSYSILIM
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Configuring the PAC52XX MMPM
Power Application Controller
4
SEPIC MODE
4.1
Block Diagram
The block diagram below shows how a DC/DC SEPIC topology may be implemented with the PAC52XX.
4.2
MMPM Configuration
The Input Voltage is supplied on VHM and output is generated on VP.
The MMPM allows you to configure several parameters for the operation of the DC-DC:




VP output voltage
VHM clamp voltage
Switching frequency
Maximum duty cycle
The VP output voltage and Switching Frequency are dependent on the application, and inductor for the
power supply. For a SEPIC mode DC-DC, the maximum duty cycle must be set to a maximum of 25%.
To configure the MMPM for a buck mode DC-DC, the following configuration is recommended:





Set SOC.PWRSTATCFG.PWRUNLOCK to 1 to enable write access to SOC.SCFG and
SOC.PWRCFG
Set SOC.SCFG.VHMCLAMP to 0 to disable the VHM voltage clamp
Select the switching frequency by writing the SOC.SCFG.FMODE and SOC.SCFG.FSWM fields
to the appropriate values (see below)
Select a 25% minimum duty cycle off time by writing SOC.SCFG.FMODE to 0 and
SOC.SCFG.MAXDUTY to 0
Enable the DC-DC by setting the SOC.PWRCFG.SMPSOFF bit to a 0
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Configuring the PAC52XX MMPM
Power Application Controller

Select the output voltage of the DC-DC (VP) by writing the SOC.PWRCFG.VP value to the
appropriate value (see below)
The DC/DC switching frequency may be selected by the values shown in the table below.
FMODE
FSWM
0
0
1
2
3
4
5
6
7
Switching
Frequency
45kHz
50kHz
55kHz
62.5kHz
72.25kHz
82.5kHz
100kHz
125kHz
The VP output voltage may be selected from the SOC.PWRCFG.VP field as shown below.
VP
0
1
2
3
4.3
VP voltage setting
5V
9V
12V
15V
Application Example
A typical configuration for a DC-DC in SEPIC mode would be:




Switching Frequency: 125kHz
MAXDUTY: Min off time: 25%
VHM Voltage clamp disabled
VP output voltage: 15V
In order to configure the MMPM for the above configuration, the following code fragment may be used:
pac5xxx_tile_register_write(ADDR_PWRCTL, 0x40);
pac5xxx_tile_register_write(ADDR_PSTATSET, 0x80);
pac5xxx_tile_register_write(ADDR_SCFG, 0x2E);
pac5xxx_tile_register_write(ADDR_PWRCFG, 0xCE);
//
//
//
//
Set
Set
Set
Set
© 2015 Copyright, Active-Semi International, Inc.
MCUALIVE (indicate alive to in case of reset)
PWRUNLOCK bit to allow firmware to modify SCFG & PWRCFG
VCLAMPSEL, Fs=125kHz, DMAX=25%
DC/DC enabled, VP=15V, VCC18, TON, TRESET, VSYSILIM
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Configuring the PAC52XX MMPM
Power Application Controller
5
AC/DC FLYBACK MODE
5.1
Block Diagram
The block diagram below shows how a AC/DC Flyback topology may be implemented with the PAC52XX.
5.2
MMPM Configuration
The Rectified Input Voltage is supplied on VHM and output is generated on VP.
The MMPM allows you to configure several parameters for the operation of the AC/DC Flyback converter:




VP output voltage
VHM clamp voltage
Switching frequency
Maximum duty cycle
The VP output voltage and Switching Frequency are dependent on the application, and inductor for the
power supply. The VHM clamp should be set to 20V.
To configure the MMPM for a buck mode DC-DC, the following configuration is recommended:




Set SOC.PWRSTATCFG.PWRUNLOCK to 1 to enable write access to SOC.SCFG and
SOC.PWRCFG
Set SOC.SCFG.VHMCLAMP to 1 to enable the VHM voltage clamp
Select the switching frequency by writing the SOC.SCFG.FMODE and SOC.SCFG.FSWM fields
to the appropriate values (see below)
Enable the DC-DC by setting the SOC.PWRCFG.SMPSOFF bit to a 0
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Configuring the PAC52XX MMPM
Power Application Controller

Select the output voltage of the DC-DC (VP) by writing the SOC.PWRCFG.VP value to the
appropriate value (see below)
The DC/DC switching frequency may be selected by the values shown in the table below.
FMODE
FSWM
0
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
1
Switching
Frequency
45kHz
50kHz
55kHz
62.5kHz
72.25kHz
82.5kHz
100kHz
125kHz
181kHz
200kHz
220kHz
250kHz
289kHz
330kHz
400kHz
500kHz
The VP output voltage may be selected from the SOC.PWRCFG.VP field as shown below.
VP
0
1
2
3
5.3
VP voltage setting
5V
9V
12V
15V
Application Example
A typical configuration for a DC-DC in SEPIC mode would be:




Switching Frequency: 181kHz
MAXDUTY: Min off time: 25%
VHM Voltage clamp enabled (20V)
VP output voltage: 15V
In order to configure the MMPM for the above configuration, the following code fragment may be used:
pac5xxx_tile_register_write(ADDR_PWRCTL, 0x40);
pac5xxx_tile_register_write(ADDR_PSTATSET, 0x80);
pac5xxx_tile_register_write(ADDR_SCFG, 0x10);
pac5xxx_tile_register_write(ADDR_PWRCFG, 0xC0);
//
//
//
//
Set
Set
Set
Set
© 2015 Copyright, Active-Semi International, Inc.
MCUALIVE (indicate alive to in case of reset)
PWRUNLOCK bit to allow firmware to modify SCFG & PWRCFG
VCLAMPSEL, Fs=181kHz, DMAX=25%
DC/DC enabled, VP=15V
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Configuring the PAC52XX MMPM
Power Application Controller
6
RECOVERING PAC52XX WHEN DC/DC DISABLED
Certain problems may prevent the DC/DC from starting properly, resulting in an unresponsive PAC
device. For example, if the user firmware disables the DC/DC controller, but the PCB is designed to only
operate in SEPIC mode, the PAC device will not be powered, and it cannot be recovered until it is
powered.
The PCB will attempt to start up the DC/DC when it is powered up. But if the PAC52XX has disabled the
internal DC/DC controller, then the power supply on VP will never come up, causing the PAC to not
power up so that the firmware can be changed.
In order to work around this issue, VP must be supplied directly. The steps below show how to do just
this.
6.1
Remove the Inductor
Remove the inductor in the DC/DC. In the schematic below (for a SEPIC converter), this is component L1.
This will separate the switching supply from VHM.
6.2
Short VHM to VP
In order to power the PAC52XX directly from VP, the PCB must have the VHM and VP pins shorted.
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Configuring the PAC52XX MMPM
Power Application Controller
6.3
Supply VP
Supply the PAC52XX on VP with 12V-15V. This will allow the PAC52XX device to start.
At this point, the user may erase the firmware, so that the DC/DC is not disabled. Then the VHM to VP
short and inductor may be disabled.
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Configuring the PAC52XX MMPM
Power Application Controller
ABOUT ACTIVE-SEMI
Active-Semi, Inc. headquartered in Dallas, TX is a leading innovative semiconductor company with
proven power management, analog and mixed-signal products for end-applications that require power
conversion (AC/DC, DC/DC, DC/AC, PFC, etc.), motor drivers and control and LED drivers and control
along with ARM microcontroller for system development.
Active-Semi’s latest family of Power Application Controller (PAC)™ ICs offer high-level of integration with
32-bit ARM Cortex M0, along with configurable power management peripherals, configurable analog
front-end with high-precision, high-speed data converters, single-ended and differential PGAs, integrated
low-voltage and high-voltage gate drives. PAC IC offers unprecedented flexibility and ease in the systems
design of various end-applications such as Wireless Power Transmitters, Motor drives, UPS, Solar
Inverters and LED lighting, etc. that require a microcontroller, power conversion, analog sensing, highvoltage gate drives, open-drain outputs, analog & digital general purpose IO, as well as support for wired
and wireless communication. More information and samples can be obtained from
http://www.active-
semi.com or by emailing marketing@active-semi.com
Active-Semi shipped its 1 Billionth IC in 2012, and has over 120 in patents awarded and pending
approval.
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Active-Semi reserves the right to modify its products, circuitry or product specifications without notice. Active-Semi products are not intended, designed,
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Active-Semi accepts no liability for inclusion and/or use of its products in such equipment or applications. Active-Semi does not assume any liability arising
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