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POWERPHASEGEVB
POWERPHASEG
Evaluation Board
User's Manual
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Description
EVAL BOARD USER’S MANUAL
The POWERPHASEG evaluation board is designed such
that it can accommodate 2 PowerPhase parts. Depending on
the type of application and necessity, any combination of the
above packages can also be used. The POWERPHASEG
evaluation board is designed to operate with an input voltage
ranging from 8 V to 19 V, and to provide an output voltage
of 0.8 V to 1.55 V for load currents of up to 25 A.
The POWERPHASEG can be ordered with either 5 V or
12 V drivers, but one can be installed at a time. The
POWERPHASEG evaluation board has a number of test
points that can be used to evaluate its performance in any
given application.
• Access to IC Features such as Enable, Switching Node
and VID Settings for Output Voltage
• Convenient Test Points for Simple, Non-Invasive
Measurements of Converter Performance Including
Input Ripple, Output Ripple, High Side and Low Side
Gate Signals and Switching Node
Applications
• Synchronous Buck Converters
High Frequency Applications
High Current Applications
♦ Low Duty Cycle Applications
Multi-Phase Synchronous Buck Converters
♦ Evaluation Board Has Only One Phase Implemented
♦
Features
♦
• 8 V to 19 V Input Voltage
• 25 A of Steady State Load Current
• 330 kHz Switching Frequency
•
Figure 1. POWERPHASEG Evaluation Board
© Semiconductor Components Industries, LLC, 2014
April, 2014 − Rev. 0
1
Publication Order Number:
EVBUM2233/D
POWERPHASEGEVB
SCHEMATIC OF THE POWERPHASEG EVALUATION BOARD
Figure 2. Schematic of the POWERPHASEG Evaluation Board
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ELECTRICAL SPECIFICATIONS
Table 1. ELECTRICAL SPECIFICATIONS FOR POWERPHASEG USING NTMFD4C85N
Parameter
Notes and Conditions
Min
Typ
Max
Units
Input Characteristics
Vin
Input Voltage
−
8
12
19
V
Vdrvr
Driver Voltage
−
5
−
12
V
Input Current
Vin = 12 V; Iout = 25 A
0
−
3
A
Iin
No Load Input Current
Vin = 12 V; Iout = 0 A; Vdrvr = 5 V
0
9
−
mA
Vin = 12 V; Iout = 0 A; Vdrvr = 10 V
0
12
−
mA
Output Characteristics
Vout
*Output Voltage
Vin = 12 V; Iout = 25 A
0.8
1.2
1.55
V
Vp-p
Maximum Switch Node Voltage
Vin = 12 V; Iout = 20 A; Vdrvr = 5 V & 10 V
−
18
−
V
Iout
Output Current
Vin = 8 V to 19 V
0
−
25
A
System Characteristics
FSW
Switching Frequency
Note 1
−
330
−
kHz
hPeak
Peak Efficiency
Vin = 12 V; Vout = 1.2 V; Vdrvr = 5 V
−
91
−
%
h
Full Load efficiency
Vin = 12 V; Vout = 1.2 V; Vdrvr = 5 V; Iout = 20 A
−
85
−
%
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
*The output voltage can be adjusted by changing the VID settings. See Appendix.
1. The switching frequency is defined by the resistors R13 and R14 and can only be changed only by changing the resistors R13 and R14.
CONNECTORS AND TEST POINTS DESCRIPTIONS
Input Power
Switching Frequency
Connect the input voltage positive probe to Pin 1 at J1 and
sense probe at J9, negative probe to the GND at Pin 2 at J1
and sense probe at J10. The input voltage can range from 8 V
to 19 V.
The converter switching frequency is set by the voltage
divider setup of R13 and R14 between the pins 10 (ROSC)
and 33 (AGND) of the NCP5386 controller. In order to
change the frequency, these resistors have to be changed.
Changing the frequency also changes the Ilim (Over Current
shutdown threshold) settings.
Output Power
Connect the output voltage positive probe to J13 (large
screw connector) and sense probe at J11, ground probe at J14
(large screw connector) and the sense probe to J12. The
output voltage is set by the VID settings (Refer to
Appendix).
Test Points Description
Monitoring the Input Voltage
The input voltage can be monitored by using the test
points at J9 and J10 on the POWERPHASEG evaluation
board. This allows the user to find out the exact value of
input voltage since there will be no losses from the cables or
connectors.
Controller Biasing
Connect the positive probe to Pin 2 at J5 and the negative
probe to the GND at Pin 1 at J5. Please keep this as a separate
supply to avoid damage to the controller especially when
other drive voltages are used. Controller VIN MAX
specification is 7 V.
Monitoring the Output Voltage
The POWERPHASEG evaluation board provides two test
points for measuring the output voltage without any losses
from the cables or connectors. The output voltage can be
measured at the points J11 and J12 on the evaluation board.
Driver Biasing
The driver positive voltage probe Vcc should be connected
to both pin 1 and 2 at J6. The driver voltage is defined
depending on the type of driver installed (i.e.) a 12 V driver
or a 5 V driver. The POWERPHASEG evaluation board is
set up to accept DFN8 footprints of ON Semiconductor 5 V
and 12 V drivers.
Monitoring the Switch Node Waveforms
The POWERPHASEG evaluation board provides the
opportunity to monitor the switch node waveforms.
The probe socket at test point JS8 provides the switch node
waveforms.
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POWERPHASEGEVB
Monitoring the High Side and Low Side Waveforms
The high side waveforms can be obtained from the probe
socket at test point JS6 and the low side waveforms can be
obtained from the probe socket at test point JS10.
The probe sockets that are provided on the evaluation
board for monitoring the waveforms are such that the
oscilloscope probes can be inserted into the probe socket and
are held in place. The Test Point and the Probe Socket are
shown in Figure 3.
Probe Ground
Connector
Probe Signal
Connector
Monitoring the PWM Signal
The PWM signal from the controller to the driver can be
monitored from the probe socket provided at JS11.
Figure 3. Tektronix Test Point & Probe Socket
Part #: 700503100
TEST EQUIPMENT REQUIRED
Voltage Sources
Meters to Measure Voltages and Currents
(ii) DC Supply Source for Driver Voltage
The supply source for the driver should be a 0 to 20 V DC
source. The driver voltage varies depending on the type of
driver used (i.e.) For NCP5911 driver, the driver voltage is
5 V and for NCP5901 driver, it is 12 V.
In the POWERPHASEG Evaluation Board, the voltages
that are to be measured are Vin, Vout and Vdrv. Similarly,
the currents that are to be measured are Iin, Iout and Idrvr. The
set up for measuring these voltages and currents, and the
meters required are shown in Figure 4. The currents are
measured across the shunt resistances that are connected
across each of the terminals of input, output and driver
voltages as shown in Figure 4. For example, the output
current is measured as, Iout = Vout / Rsh. Similarly the input
and driver current can also be measured. The connecting
wires from the output terminal to the electronic load should
be thicker in order to avoid losses and to measure the exact
voltage at the end of the terminals.
Electronic Load
Oscilloscope
(i) DC Supply Source for Input Voltage
The input voltage source should be a 0 to 20 V DC source.
The input voltage may be increased further depending on the
parts that are being used on the POWERPHASEG
evaluation board such that the part can withstand the applied
voltage. Hence, based on the required input voltage to be
applied, the requirement of the DC power supply varies.
The oscilloscope is used to monitor the switch node
waveforms. This should be an analog or digital oscilloscope
set for DC coupled measurement with 50 MHz bandwidth.
The resolution can be set at 5 V/division vertically and
20 ns/division horizontally. The oscilloscope channels can
be connected at various test points such as High Side Driver
(JS6), Low Side Driver (JS10), Switch Node (JS8), G1
PWM Signal (JS11), Vin (sense) (J9 & J10) and Vout (sense)
(J11 & J12).
The electronic load supplied to the POWERPHASEG
evaluation board ranges from 0 A to 25 A. Hence a DC
current source of 0 A to 30 A is needed for the evaluation
board.
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POWERPHASEGEVB
TEST SET UP AND PROCEDURE
Test Setup
The test set up, test points and components present on the
POWERPHASEG Evaluation Board are shown in Figure 4.
The POWERPHASE parts placed on the evaluation board
are the Q43 and Q44 (Refer to Figure 1).
Figure 4. Schematic of the Test Setup
Start Up and Shut Down Procedures
4. Set the load current to required value. The load
current must be incremented slowly to prevent
the transient spikes at CS1/CS2 thereby shutting
down the controller. If the controller shuts down,
the input voltage must be set to zero, then the input
power supply has to be turned off, then turned on
and Vin re-established.
Before starting the test, the oscilloscope probes should be
connected. IR or k-type thermo-couples can be used to
monitor the temperature of the parts to make sure that they
are still within the limits. IR monitoring requires the removal
of the oscilloscope probes due to the IR beam interference.
Start Up Procedure:
1. Initially set all the power supplies to 0 V.
2. Set the output voltage by changing the VID
settings. The output voltage should not be changed
with either the controller or driver active.
3. Set the driver voltage and then set the input
voltage.
Shut Down Procedure:
1. Shut down the Load.
2. Reduce the input voltage to zero and then shut
down the input power supply.
3. Reduce the driver voltage to zero and then shut
down the driver power supply.
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POWERPHASEGEVB
Test Procedure
1. Before making any connections, make sure to set
the power supplies for input voltage and the driver
voltage at 0 V. Also make sure that the load
current is at 0 A.
2. Connect the Oscillator probes at the desired test
points.
3. Set the driver voltage to the required value
(For example, Vdrvr = 5 V).
4. After reaching the required driver voltage,
set the input voltage as required.
(For example, Vin = 12 V).
5. Set the load current slowly to the desired value.
For example, Iout = 2.5 A. (Refer to Start Up
Procedure #4).
6. The frequency is already set to 330 kHz.
If a different switching frequency is required,
R13 and R14 have to be changed as per the data
sheet of NCP5386. (Refer to Appendix).
7. Connect the voltmeters/multi-meters to monitor
the required parameters. (Refer to Figure 4).
8. Obtain the required data and waveforms.
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POWERPHASEGEVB
TEST RESULTS
Efficiency of NTMFD4C85N on POWERPHASEG Evaluation Board for Vdrvr = 5 V
95
Efficiency (%)
90
85
80
75
70
0
5
10
15
20
25
Load (A)
Figure 5. Efficiency for POWERPHASEG Board for Vdrvr = 5 V
Switch Node Voltage Waveforms of NTMFD4C85N on POWERPHASEG Evaluation Board for Vdrvr = 5 V
(i) At Iout = 20 A and Vdrvr = 5 V (Vin = 12 V; Vout = 1.2 V; Freq = 330 kHz)
Figure 6. Switch Node Waveforms for Vdrvr = 5 V
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POWERPHASEGEVB
APPENDIX
Table of AMD VID Settings for NCP5386B Controller
The Grayhill 76PSB08ST 8 position switch used for
setting the output voltage of the synchronous buck
converter. Figure 7 below shows the pin assignment of the
switch. VID0–VID5 set the output voltage. DAC, and EN is
the enable pin of the controller (controller reset). EN must
always be in the up position (1) unless a reset is performed.
To set the output voltage to 1.2 V, for example: VID0 = 0
(down), VID1, VID2, VID3 = 1 (up), VID4 = 0 (down), and
VID5, DAC, EN = 1 (up).
Figure 7. Grayhill Switch Pin Labeling
Table 2. VID CONTROL SETTINGS FOR OUTPUT VOLTAGE
PIN 1
PIN 2
PIN 3
PIN 4
PIN 5
PIN 6
PIN 7
PIN 8
VID0
VID1
VID2
VID3
VID4
VID5
DAC
EN
VOUT (V)
Tolerance
0
0
0
0
0
1
1
1
1.5625
±0.5%
1
0
0
0
0
1
1
1
1.5375
±0.5%
0
1
0
0
0
1
1
1
1.5125
±0.5%
1
1
0
0
0
1
1
1
1.4875
±0.5%
0
0
1
0
0
1
1
1
1.4925
±0.5%
1
0
1
0
0
1
1
1
1.4400
±0.5%
0
1
1
0
0
1
1
1
1.4125
±0.5%
1
1
1
0
0
1
1
1
1.3875
±0.5%
0
0
0
1
0
1
1
1
1.3625
±0.5%
1
0
0
1
0
1
1
1
1.3375
±0.5%
0
1
0
1
0
1
1
1
1.3125
±0.5%
1
1
0
1
0
1
1
1
1.2875
±0.5%
0
0
1
1
0
1
1
1
1.265
±0.5%
1
0
1
1
0
1
1
1
1.2400
±0.5%
0
1
1
1
0
1
1
1
1.2125
±0.5%
1
1
1
1
0
1
1
1
1.1900
±0.5%
0
0
0
0
1
1
1
1
1.1625
±0.5%
1
0
0
0
1
1
1
1
1.1375
±0.5%
0
1
0
0
1
1
1
1
1.1125
±0.5%
1
1
0
0
1
1
1
1
1.0900
±0.5%
0
0
1
0
1
1
1
1
1.0650
±0.5%
1
0
1
0
1
1
1
1
1.0400
±0.5%
0
1
1
0
1
1
1
1
1.0125
±0.5%
1
1
1
0
1
1
1
1
0.9875
±0.5%
0
0
0
1
1
1
1
1
0.9625
±0.5%
1
0
0
1
1
1
1
1
0.9375
±0.5%
0
1
0
1
1
1
1
1
0.9125
±0.5%
1
1
0
1
1
1
1
1
0.8900
±0.5%
0
0
1
1
1
1
1
1
0.8650
±0.5%
1
0
1
1
1
1
1
1
0.8400
±0.5%
0
1
1
1
1
1
1
1
0.8125
±0.5%
1
1
1
1
1
1
1
1
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Shutdown
POWERPHASEGEVB
Pin Diagram of NCP5386B Controller
Figure 8. Top View of the Pin Diagram of NCP5386B
Switching Frequency of the Oscillator
The switching frequency of the oscillator can only be
changed by changing the resistors R13 and R14.
For more information on NCP5386B: see Data Sheet of
NCP5386B.
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EVBUM2233/D