1This user guide describes the evaluation module (EVM) for the UCD9224 Digital PWM System Controller
and the UCD7242 Digital Dual Synchronous Buck Power Driver. The UCD9224 is a multi-rail, multi-phase
synchronous buck digital PWM controller designed for non-isolated DC/DC power applications. This
device combines dedicated circuitry for loop management with a microcontroller, flash memory, and a
serial interface to support configurability, monitoring and management. The UCD7242 Dual
Synchronous-Buck Power Driver, the foundation of the PTD08D210W Digital PowerTrain™ module,
simplifies POL rail development by integrating and optimizing many of the power train components (driver,
MOSFETS, current sensing and protection features) needed to realize two voltage phases/rails.
2Description
The UCD9224EVM-464 includes the Digital Power Controller paired with the UCD7242 driver on the
PTD08D210W module to create a power system consisting of two single-phase, point-of-load (POL)
power rails, each capable of up to 10 A of output current.
For evaluation purposes, the EVM is supplied pre-configured to operate from a 12-V +/- 10% input voltage
source and will produce stepped down voltages of 2.5 V (V
once the input voltage has reached the power system’s under-voltage lockout that is set within the
controller.
The PMBus™ compatible serial data interface included on the EVM allows the user to connect the power
system to a Windows based host computer running the Fusion Digital Power™ Designer software with the
USB Interface Adapter EVM (refer to the Section 5: Test Setup for links to the software and adapter
website and documentation). The UCD9224EVM-464 output rails can then be monitored and controlled or
further configured within the functional limits of the PTD08D210W module (VINfrom 4.5 V to 14.0 V and
V
from 0.7 V to 3.6 V), refer to document SLUU490 - Using the UCD92xx Digital Point of Load
OUT
Controller for additional information.
For power systems requiring the features found in the UCD9224, (up to 2 rails/4 phases but needing
additional phases/rails then), the UCD9246, (up to 4 rails/6 phases), and UCD9248, (up to 4 rails/8
phases), digital controllers are available. Additionally, complex power systems can be implemented with
multiple controllers, all sharing the same PMBus ™ interface, and configured to operate as a complete
power solution.
•Fully Configurable Multi-Output and Multi-Phase Non-Isolated DC/DC PWM Controller
•Controls Up to 2 Voltage Rails and Up to 4 Phases
•Supports Switching Frequencies Up to 2 MHz with 250-ps Duty-Cycle Resolution
•Up To 1-mV Closed Loop Resolution
•Hardware-Accelerated, 3-Pole/3-Zero Compensator with Non-Linear Gain for Improved Transient
Performance
•Supports Multiple Soft-Start and Soft-Stop Configurations Including Prebias Start up
•Supports Voltage Tracking, Margining and Sequencing
•Supports Current and Temperature Balancing for Multi-Phase Power Stages
•Supports Phase Adding/Shedding for Multi-Phase Power Stages
•Sync In/Out Pins Align DPWM Clocks Between Multiple UCD92xx Devices
•12-Bit Digital Monitoring of Power Supply Parameters Including:
– Input/Output Current and Voltage
– Temperature at Each Power Stage
•Multiple Levels of Over-current Fault Protection:
– External Current Fault Inputs
– Analog Comparators Monitor Current Sense Voltage
– Current Continually Digitally Monitored
•Over and Under-voltage Fault Protection
•Over-temperature Fault Protection
•Enhanced Nonvolatile Memory with Error Correction Code (ECC)
•Device Operates From a Single Supply with an Internal Regulator Controller That Allows Operation
Over a Wide Supply Voltage Range
•Supported by Fusion Digital Power™ (UCD9224 Datasheet) Designer, a Full Featured PC Based
Design Tool to Simulate, Configure, and Monitor Power Supply Performance
Description
SLUU443–March 2011UCD9224EVM-464 Digitally Controlled Dual-Rail POL
Voltage rangeAs configured, EVM input capable of 4.75 V to 14.0 V10.81213.2V
No load input current135mA
Controller turn-on voltageInput voltage above which outputs become enabled11.0V
Controller turn-off voltageInput voltage below which outputs become disabled10.5
Controller OVP protectionInput voltage above which operation is latched off13.8
Output Characteristics
Output voltage, VOUT1I
Output load current, IOUT110
Output voltage regulationLine regulation: VIN= 10.8 V to 13.2 V, I
Output voltage rippleI
Output over current12.5A
Output voltage, VOUT2Output current = 10 A1.7501.81.850V
Output load current, IOUT210A
Output voltage regulationLine regulation: VIN= 10.8 V to 13.2 V, I
Output voltage rippleI
Output over current12.5A
Systems Characteristics
Switching frequency750kHz
Efficiency2.5 V at 10 A, 1.2 V at 0 A87.5%
Operating temperature25ºC
= 10 A2.4502.52.550V
OUT1
Load regulation: I
= 10 A30mVpp
OUT1
Load regulation: I
= 10 A25mV
OUT2
OUT1
OUT2
1.2 V at 10 A, 2.5 V at 0 A78.2%
Electrical Performance Specifications
= 10 A<1.0%
OUT1
= 10% to 100%, VIN= 12 V<1.0%
= 10 A<1.0%
OUT2
= 10% to 100%, VIN= 12 V<1.0%
PP
SLUU443–March 2011UCD9224EVM-464 Digitally Controlled Dual-Rail POL
Input Voltage Source: 12-V power supply with at least a 5-A sourcing capability.
Multimeters: Two 5 ½ digit digital multimeters.
Output Load: Two electronic loads capable of sinking 10 A from low voltage (<1 V) sources.
Oscilloscope: Minimum 4-channel, 100-MHz bandwidth with storage capability.
Fan: Not required but may be desirable if testing at full output power.
Recommended Wire Gauge:
Input Voltage: 20 AWG min.
Output Load: 16 AWG min.
5.1.1Test configuration, Monitoring and Control Functionality
PC computer running Microsoft OS version:
•XP (32 – bit)
•Vista (32 – bit)
•Vista (64 – bit untested, should be compatible)
•7 (32 or 64 – bit)
Texas Instruments’ USB Interface Adapter EVM - P/N USB-to-GPIO, User's Guide - SLLU093
Fusion Digital Power Designer Software Installer Executable File:
fusion_digital_power_designer_download_for_power_controllers_version_1_8_6.exe or newer
Test Setup
SLUU443–March 2011UCD9224EVM-464 Digitally Controlled Dual-Rail POL
J42-JanADDR-1Jumper location to modify ADDR-1 setting
J51+V
J61+V
J7 (optional)1REG3.3 V from onboard regulator U1
J81CNTRLManual control line access
J9 (optional)1GNDInput voltage return
(1)
J7 is not populated by default and a shunt trace connects Pins 1 and 2 on the EVM.
(2)
J9 (DC power jack) replaces J1 to allow use of a standard 5.5mm/2.5mm power adapter plug.
Table 2. Connector definition
2GNDInput voltage return
5USB interface adapter – 3.3V 100ma supply (optional)
6USB interface adapter – ground
7PMBus_CNTRLUSB interface adapter – control line
8PMBus_ALERTUSB interface adapter – alert line
9PMBus_CLKUSB interface adapter – clock line
10PMBus_DATAUSB interface adapter – data line
2PGOODPower good – all rails (UCD9224 Pin 26)
3AGNDAnalog ground reference point for external signals
4VTRACKInput reference for external voltage tracking
4-MarADDR-0Jumper location to modify ADDR-0 setting
OUT2
2-V
2-V
OUT2
OUT1
OUT1
23.3 V3.3-V supply for UCD9224 controller
3EXT3.3 V from J2-5 (PMBus)
2AGNDGround
2Unconnected
3/3 AVINInput voltage
Output voltage 2
Output voltage 2 return
Output voltage 1
Output voltage 1 return
(1)
(1)
(2)
(2)
Test Setup
SLUU443–March 2011UCD9224EVM-464 Digitally Controlled Dual-Rail POL
CS_1CS-1APower stage 1A current sense input and input to analog comparator 1
CS_2CS-2APower stage 2A current sense input and input to analog comparator 2
TP1AGNDAnalog ground reference
TP2AGNDAnalog ground reference
TP3nRESETReset pin – active low
TP4V33FBBase drive control for 3.3-V linear regulator transistor (no connect if using an
TP5SEQ-1Sequencing input/output (GPIO)
TP6CS-1BPower stage 1B current sense input
TP7nTRSTJTAG test reset (pull-down to ground using 10-kΩ resistor)
TP8DPWM-1B
TP9TMSJTAG test mode select (pull-up to 3.3 V with 10-kΩ resister)
TP10DPWM-3A
TP11TDI/Sync_InJTAG test data in (multiplexed with Sync_In for synchronizing switching
TP12TDO/Sync_OutJTAG test data out (multiplexed with Sync_Out for synchronizing switching
TP13TCKJTAG test clock
TP14SRE-1BSynchronous rectifier enable output 1B
TP15SRE-3ASynchronous rectifier enable output 3A
TP16FLT-1BExternal fault input 1B
TP17FLT-3AExternal fault input 3A
TP18CS-3APower stage 3A current sense input and input to analog comparator 4
Table 3. Test Point Functions
OUT
OUT2
Output voltage for rail #1 referenced to PGND
Output voltage for rail #2 referenced to PGND
external 3.3-V LDO regulator)
frequency across multiple devices) – Pull-up to 3.3 V with 10-kΩ resistor
Accessing the UCD9224EVM-464’s configuration, control and monitoring capabilities with the Fusion
Digital Power Designer software tool requires a one-time software setup per host system.
6.1Fusion Digital Power Designer Software (Fusion GUI) Installation
Place the Fusion Digital Power Designer Software (Fusion GUI) Installer zip file (UCD9224EVM-464
Software Files) in a known location on the host computer to be used for EVM configuration/test. Unzip the
installation files for the Fusion Digital Power Designer Software by double clicking the zip file.
Double click the unzipped TI-Fusion-Digital-Power-Designer-1.8.6.exe file and proceed through the
installation by accepting the installer prompts and the license agreement. Use the Fusion GUI installer’s
suggested default installation locations to complete the install.
When the Fusion GUI installation reaches the finished window, uncheck the launch application check box
and close the window.
7Test Procedure
The UCD9224EVM-464 is provided with a default configuration that will allow the user to immediately
power up the EVM and begin testing as either a stand-alone power solution or as a “networked” power
system when accessing the PMBus™ interface.
7.1Test Setup
1. Set the external input power supply’s output voltage to 12 V +/-0.5 V and current limit the supply at 5.0
A. Ensure the output voltage is disabled.
2. Attach supply connection leads (AWG 20 minimum) between the external power supply and the input
voltage connector (J1) on the EVM following the polarity settings shown in the Recommended Test
Setup (Figure 4).
3. Set both Electronic Load A and B to constant current loading and adjust their loading currents to 10.0
A +/- 0.1 A each.
4. Attach leads (AWG 16 minimum) between the Electronic Load A inputs and the target EVM’s V
connector following the polarity settings shown in the Recommended Test Setup (Figure 4).
5. Attach leads (AWG 16 minimum) between the Electronic Load B inputs and the target EVM’s V
connector following the polarity settings shown in the Recommended Test Setup (Figure 4).
6. Ensure that both electronic loads have their loads enabled.
Software Setup
(J6)
OUT1
(J5)
OUT2
SLUU443–March 2011UCD9224EVM-464 Digitally Controlled Dual-Rail POL
1. Attach the DMMs to both output voltage test points, +V
2. Enable the external input voltage supply.
3. Measure V
OUT1
and V
Output Voltages.
OUT2
7.3VINUVLO Settings and OVP Setpoint
1. Remove the DMM from V
2. Slowly reduce the external input voltage supply until V
3. Slowly increase the external input voltage supply until V
4. Slowly increase the external input voltage supply until V
5. Return the input supply to 12.0 V, confirm operation is still disabled.
6. Disable the external input voltage source.
and connect to the input voltage test points, VINand PGND.
OUT2
7.4Turn-On Timing / Power Good
Testing the currently configured settings for Turn-On Timing and Power Good
1. Attach Channel 1 of the oscilloscope between V
V
and PGND test points.
OUT2
2. Set the oscilloscope to 1.0 V/div. vertical scale on both channels and set the time scale to 1 ms/div.
Set the Trigger source to Channel 1 with a single-shot acquisition.
3. Remove DMM from VINand connect between the PGOOD (J2-2) and AGND (J2-3).
4. Enable the external input power supply.
5. Review captured waveform and active high PGOOD signal.
1. Attach the USB Interface Adapter to the computer hosting the Fusion GUI software with the supplied
USB A-to-MiniB cable then to the UCD9224 with the supplied 10-pin ribbon cable. The USB Interface
Adapter will be recognized as an HID device by the host system with no additional drivers needed. The
green LED will illuminate when the adapter has been connected with the system.
2. With the UCD9224EVM-464 still powered, launch the Fusion GUI by double clicking the desktop icon
or, alternately, navigating to the application icon in the program folder through the Windows Start Menu
(default location: Start\All Programs\Texas Instruments Fusion Digital Power Designer\Fusion Digital
Power Designer).
NOTE: The Offline Mode version of the GUI is for project file development only and will not be able
to access an operating power system.
3. The GUI will scan the bus for available devices and after this discovery process is successful the GUI
will open to its main Configuration Page (Figure 6). Navigation through the GUI is controlled with the
Page and Tab selections which are highlighted in red.
Test Procedure
Figure 6. Default Fusion Digital Power Designer GUI Start Page
SLUU443–March 2011UCD9224EVM-464 Digitally Controlled Dual-Rail POL
4. Select the Monitor Page and the window in Figure 7 will be displayed. The operating status of the
output voltage and other parameters for Rail #1 can be reviewed from this window, by default Rail #1
is always presented at the Fusion GUI startup. Rail #2 can be monitored by using the dropdown
selection in the upper right corner of the monitoring window and selecting UCD9224 @ Address xxx
Rail #2. The red horizontal lines that are present in most of the plots indicate the fault limits for this
parameter and the yellow lines are the warning levels.
In the V
slightly when referenced to the earlier section of the plot. This reflects the application of margining to
the output voltage with the Margin High setting still visible at the bottom of the column just to the left of
the plots.
Rail #1 plot shown in Figure 7, the voltage can be seen to shift down slightly and then up
OUT
www.ti.com
Figure 7. Fusion Digital Power Designer Software – Monitor Page – Rail #1
NOTE: A Low VINalert may be present when monitoring is first accessed but it does not affect the
operation of the system. This is a typical alert condition during initial voltage application, as
VINramps above the voltage necessary to power the UCD9224 but has not reached the Turn
Controller On threshold before the first VINsample is taken by the controller. This contrasts to
a VINUnder Voltage Warning which occurs when the unit is operating and the input voltage
falls below the VINUV Warning level.
5. There are configuration value boxes in many of the plot windows, ex. OT Fault and OT Warn boxes
Test Procedure
exist within the Temp Rail #1 plot. These are the numerical values for the fault and warning limits and
reflect the same values found on the Configuration page of the GUI.
Change the OT Warn level from the pre-configured 85°C to 20°C and click the Write button, observe in
the Status Registers/Lines section of the Monitor page that the Temp Status has been updated from
OK to OT Warn and the SMBALERT# changes from Not Asserted to Asserted.
PMBus™ digital controllers are considered slave devices on the SMBus and as such they cannot
initiate communication with the system controller directly, but instead need to ask for assistance by
activating the SMBus Alert line, SMBALERT#. If the SMB Alert line is pulled low then the system
controller, the Fusion GUI for this example, will send an inquiry across the PMBus™ to determine
which controller requires assistance and why. Once the system controller has determined the issue
(and possibly initiated a response), then the faults can be cleared. Return the OT Warn level to 85°C
and click the Clear Faults button.
Now change the OT Fault level to 20°C and click the Write button, observe that several items changed
state within the Status Registers/Lines section. The Temp Status and Logged Faults both indicate OT
Fault, Misc Status indicates POWER_GOOD#, and the SMBALERT# is Asserted again.
POWER_GOOD# is an indication that one or both rails have violated either the Power_Good_ON or
_OFF thresholds in the configuration. In this case, it is the Power_Good_Off threshold because the
configured response for an OT Fault on Rail#1 had been set to Shut Down Immediately.
Warnings and faults are stored in RAM and will be cleared when power to the controller is cycled or
the Clear Faults button is exercised. Logged faults are stored in Flash and they are persistent after a
power cycle. Logged faults can be cleared with the Clear Logged Faults button.
Power cycle the UCD9224 EVM and the configuration will be returned to the original state before the
above changes were implemented.
SLUU443–March 2011UCD9224EVM-464 Digitally Controlled Dual-Rail POL
7.6Restoring the UCD9224 EVM’s Original Configuration
The file HPA464_EVM_Default_Configuration.XML can be found on the TI website and is provided to
allow the user to return the EVM to its originally configured state. Simply open the Fusion GUI while the
powered EVM is connected to the computer with the USB Interface Adapter. At the default Configuration
Screen select File → Import Project from the dropdown menu at the top of the window and the SelectProject File window will open. Click the Select File button and navigate to the location of and highlight
the HPA464_EVM_Default_Configuration.xml file and click the Open button. Click the Next > button
and the Select Project Items to Import window will open, set the check boxes as shown in Figure 8 and
click the Next > button. In the Review Parameters to Import window, click the Select All button and then
click the Write Checked button. The Fusion GUI will download the default configuration settings (it may
generate two warnings about NACK of SYNC_OFFSET command, this is OK, the controller NACKs this
command if the value is already zero). When the download is complete, click the Next > button then the
OK button to complete the project file import. The Fusion GUI will perform a device reset after which the
UCD9224EVM-464 should be restored to its original configuration settings.
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the
product(s) must have electronics training and observe good engineering practice standards. As such, the goods being provided are
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including product safety and environmental measures typically found in end products that incorporate such semiconductor
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Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30
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This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION
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EVM Warnings and Restrictions
It is important to operate this EVM within the input voltage range of 4.75 V to 12 V and the output voltage range of 0.7 V to 3.6 V .
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are
questions concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the
EVM. Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load
specification, please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than 60° C. The EVM is designed to
operate properly with certain components above 60° C as long as the input and output ranges are maintained. These components
include but are not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of
devices can be identified using the EVM schematic located in the EVM User's Guide. When placing measurement probes near
these devices during operation, please be aware that these devices may be very warm to the touch.
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