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Table of Contents
User’s Guide
TPS40195 Buck Controller Evaluation Module User's
Guide
Table of Contents
1 Introduction.............................................................................................................................................................................2
2 Description.............................................................................................................................................................................. 2
2.1 Applications........................................................................................................................................................................2
2.2 Features............................................................................................................................................................................. 2
3 TPS40195EVM Electrical Performance Specifications........................................................................................................3
4 Schematic................................................................................................................................................................................4
4.1 Test Points..........................................................................................................................................................................5
5 Test Setup................................................................................................................................................................................5
5.1 Equipment.......................................................................................................................................................................... 5
5.2 Equipment Setup................................................................................................................................................................7
6 Test Procedure........................................................................................................................................................................ 8
6.1 Line and Load Regulation.................................................................................................................................................. 8
6.2 Output Ripple Measurement (TP5, TP13)..........................................................................................................................8
6.3 Loop Analysis (TP7, TP8, TP10)........................................................................................................................................9
6.4 Disable (TP11) and Power Good (TP9)............................................................................................................................10
6.5 Switch Node (TP4) and SYNC (TP12)............................................................................................................................. 10
6.6 Equipment Shutdown....................................................................................................................................................... 10
7 TPS40195EVM Typical Performance Data and Characteristic Curves.............................................................................11
7.1 Line and Load Regulation.................................................................................................................................................11
7.2 Efficiency.......................................................................................................................................................................... 11
7.3 Output Voltage Ripple...................................................................................................................................................... 12
7.4 Transient Response......................................................................................................................................................... 12
7.5 Bode Plots........................................................................................................................................................................13
7.6 Test Point Waveforms...................................................................................................................................................... 14
8 EVM Assembly Drawings and Layout.................................................................................................................................15
9 List of Materials.....................................................................................................................................................................17
10 Revision History................................................................................................................................................................. 17
Trademarks
All trademarks are the property of their respective owners.
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Introduction
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1 Introduction
The TPS40195EVM evaluation module (EVM) is a synchronous buck converter providing a fixed 3.3-V output at
up to 20 A from a 12-V input bus. The EVM is designed to start up from a single supply, so no additional bias
voltage is required for start up. The module uses the TPS40195 4.5-V to 20-V Input, Voltage-Mode, Synchrns
Buck Controller w/ PGOOD data sheet.
2 Description
The TPS40195EVM is designed to use a regulated 12-V bus (8 V to 20 V) to produce a regulated 3.3-V output
at up to 20 A of load current. TPS40195EVM is designed to demonstrate the TPS40195 in a typical 12-V bus to
low-voltage application while providing a number of test points to evaluate the performance of the TPS40195 in a
given application.
2.1 Applications
•
•
•
•
•
Non-isolated medium current point-of-load and low-voltage bus converters
Networking equipment
Telecommunications equipment
Computer peripherals
Digital set-top box
2.2 Features
•
•
•
•
•
•
2
8-V to 20-V input range
3.3-V fixed output
20-ADC steady state output current
300-kHz switching frequency
2-layer PCB with all components on top side
Convenient test points for probing switching waveforms and non-invasive loop response testing
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TPS40195EVM Electrical Performance Specifications
3 TPS40195EVM Electrical Performance Specifications
Table 3-1. TPS40195EVM Electrical and Performance Specifications
PARAMETER
CONDITIONS
MIN
NOM
MAX
UNITS
INPUT CHARACTERSTICS
VIN
Input voltage
8
IIN
Input current
VIN = 8 V, IOUT = 20 A
—
9
A
No load input current
VIN = 12 V, IOUT = 0 A
—
60
mA
VIN_ON
Input turn-on voltage
IOUT = 0 A to 20 A
VIN_HYS
Input hysteresis
IOUT = 0 A to 20 A
6.3
12
7.2
20
8
1.12
V
V
OUTPUT CHARACTERSTICS
VOUT
Output voltage
VIN = 12 V, IOUT = 20 A
3.23
3.3
3.36
Line regulation
Load regulation
VIN = 8 to 20 V, IOUT = 20 A
—
—
0.5%
VIN = 12 V, IOUT = 0 to 20 A
—
—
0.5%
VOUTpp
IOUT
Output voltage ripple
VIN = 12 V, IOUT = 20 A
—
—
50
Output current
VIN = 8 V to 20 V
0
20
20
IOCP
Output overcurrent inception point
VIN = 12 V
20.5
—
—
V
mVpp
A
TRANSIENT RESPONSE
ΔI
Load step
—
16
—
A
Load slew rate
20 A to 4 A to 20 A
—
1
—
A/μsec
Over shoot
—
300
—
mV
Settling time
—
20
—
μs
SYSTEMS CHARACTERSTICS
FSW
Switching frequency
240
300
360
ηpk
Peak efficiency
VIN = 12 V, IOUT = 0 to 20 A
—
95%
—
η
Full load efficiency
VIN = 12 V, IOUT = 20 A
—
92%
—
Operating temperature range
VIN = 8 to 20 V, IOUT = 0 to 20 A, with
fan
—
25
—
Top
kHz
°C
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Schematic
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GND
3.3V @20A
GND
VIN
8.0 to 20V
+
+
+
+
+
+
+
+
VOUT
4 Schematic
Figure 4-1. TPS40195EVM Schematic for Reference Only, See Table 9-1 List of Materials for Specific
Values
4
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Schematic
4.1 Test Points
Table 4-1. Test Points Available on the TPS40195EVM
TEST POINT
NAME
DESCRIPTION
TP1
VIN
Measure the input voltage at this point.
TP2
GND
Ground connection for input voltage measurements
TP3
Soft Start
Monitor the soft start capacitor voltage.
TP4
Switch Node
Monitor the switch node voltage.
TP5
VOUT
Measure the output voltage and ripple at this point, see Section 6.1.
TP6
GND
Ground connection for output voltage measurements
TP7
CHA
Input A for loop analysis, see Section 6.3.
TP8
CHB
Input B for loop analysis, see Section 6.3.
TP9
Power Good
Monitor power good signal at this point, see Section 6.4.
TP10
GND
General ground connection
TP11
DISABLE
Short TP11 to TP2 to disable the TPS40195 controller, see Section 6.4.
TP12
SYNC
Inject square wave synchronizing pulse here, see Section 6.5.
TP13
GND
Used for output ripple test with TP5, see Section 6.2.
5 Test Setup
5.1 Equipment
5.1.1 Voltage Source
VIN: The input voltage source (VIN) should be a 0-V to 20-V variable DC source capable of 20 ADC.
5.1.2 Meters
A1: 0 ADC to 20 ADC, ammeter
V1: VIN, 0-V to 20-V voltmeter
V2: VOUT, 0-V to 5-V voltmeter
5.1.3 Loads
LOAD1: The output load (LOAD1) should be an electronic constant current mode load capable of 0 ADC to 20
ADC at 3.3 V.
5.1.4 Oscilloscope
Oscilloscope: A digital or analog oscilloscope can be used to measure the ripple voltage on VOUT. It is
also used to monitor various test points around the EVM. Section 6 describes test procedure for these
measurements. For ripple measurements it is not recommended to use the leaded ground connection supplied
with the oscilloscope. This can induce additional noise due to the large ground loop area.
5.1.5 Signal Generator
A signal generator can be used to synchronous the EVM to a higher switching frequency. See Section 6 for
details on doing this.
5.1.6 Recommended Wire Gauge
VIN to J1: The connection between the source voltage, VIN and J1 of the EVM can carry as much as 20 ADC.
The minimum recommended wire size is 2x AWG #16 with the total length of wire less than two feet (2-feet
input, 2-feet return).
J3 and J4 to LOAD1 (Power): The power connection between J2 of the EVM and LOAD1 can carry as much
as 20 ADC. The minimum recommended wire size is 2x AWG #16, with the total length of wire less than two feet
(1-foot output, 1-foot return).
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Test Setup
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5.1.7 Other
Fan: This evaluation module includes components that can get hot to the touch, because this EVM is not
enclosed to allow probing of circuit nodes, a small fan capable of 200 LFM to 400 LFM is required to reduce
component surface temperatures to prevent user injury. The EVM should not be left unattended while powered.
The EVM should not be probed while the fan is not running.
6
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Test Setup
5.2 Equipment Setup
Shown in Figure 5-1 is the basic test setup recommended to evaluate the TPS40195EVM. Please note that
although the return for J1 and J4 are the same, the connections should remain separate as shown in Figure 5-1.
1. Working at an ESD workstation, make sure that any wrist straps, bootstraps, or mats are connected
referencing the user to earth ground before power is applied to the EVM. Electrostatic smock and safety
glasses should also be worn.
2. Prior to connecting the DC input source, VIN, it is advisable to limit the source current from VIN to 20-A
maximum. Make sure VIN is initially set to 0 V and connected as shown in Figure 5-1.
3. Connect the ammeter A1 (0-A to 20-A range) between VIN and J1 as shown in Figure 5-1.
4. Connect voltmeter V1 to TP1 and TP2 as shown in Figure 5-1.
5. Connect LOAD1 to J3 and J4 as shown in Figure 5-1. Set LOAD1 to constant current mode to sink 0 ADC
before VIN is applied.
6. Connect voltmeter, V2 across TP5 and TP6 as shown in Figure 5-1.
7. Place Fan as shown in Figure 5-1 and turn on, making sure air is flowing across the EVM.
FAN
.
Oscilloscop
e
See figure 3 for tip
and barrel
measurement
1M W , AC
20MHz
+ V2 -
LOAD1
3.3V
0 to 20A
+
-
V IN
0 to 20V
+ V1 -
A1
-
+
Figure 5-1. TPS40195EVM Recommended Test Setup
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Test Procedure
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6 Test Procedure
6.1 Line and Load Regulation
1.
2.
3.
4.
5.
6.
Increase VIN from 0 V to 8 V.
Step LOAD1 from 0 A to 20 A.
Record, VIN, IIN, VOUT and IOUT for each LOAD1 step.
Step VIN from 8 V to 20 V.
Repeat 2 to 4 above for each VIN step.
See Section 6.6 for equipment shut down.
See Section 7.1 and Section 7.2 for typical line and load regulation curves and efficiency results.
6.2 Output Ripple Measurement (TP5, TP13)
1. Set up the EVM as described in Section 5.2 and Figure 5-1.
2. Set the oscilloscope to the following:
• 1-MΩ input impedance
• 20-MHz Bandwidth
• AC coupling
• 1-μs/div horizontal resolution
• 10-mV/div vertical resolution
3. Place the oscilloscope probe tip through TP5 and hold the ground barrel to TP13 as shown in Figure 6-1. For
a hands free approach, the loop in TP13 can be cut and opened to cradle the probe barrel. V2 can have to
be removed from these test points to allow the oscilloscope to be connected.
4. Increase VIN to 8 V.
5. Vary LOAD1 from 0 A to 20 A and observe the oscilloscope waveform.
6. Repeat step 5 for various VIN values up to 20 V.
7. See Section 6.6 for equipment shutdown.
See Section 7.3 for typical ripple voltage results
Metal Ground Barrel
Probe Tip
TP5
TP13
Figure 6-1. Output Ripple Measurement - Tip and Barrel Using TP5 and TP13
8
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Test Procedure
6.3 Loop Analysis (TP7, TP8, TP10)
The TPS40195EVM contains a 1.30-kΩ series resistor in the feedback loop to allow for matched impedance
signal injection into the feedback for loop response analysis.
1.
2.
3.
4.
5.
6.
7.
8.
9.
Set up the EVM as described in Section 5.2 and Figure 5-1.
Connect a input signal amplitude measurement probe (Channel A) to TP7 as shown in Figure 6-2.
Connect a output signal amplitude measurement probe (Channel B) to TP8 as shown in Figure 6-2.
Connect the ground lead of Channel A and Channel B to TP10 as shown in Figure 6-2.
Inject 30-mV or less signal across R11 (TP7 and TP8) through an isolation transformer.
Sweep frequency from 100 Hz to 1 MHz with 10 Hz or lower post filter.
Control loop gain can be measured by 20 × Log (ChannelB/ChannelA).
Control loop phase is measured by the phase difference between Channel A and Channel B.
Disconnect Isolation transformer from TP7 and TP8 before making other measurements (signal injection into
feedback may interfere with accuracy of other measurements).
10. See Section 6.6 for equipment shutdown.
See Section 7.5 for typical bode plots and transient performance of this EVM.
+ V2 -
FAN
LOAD1
3.3V
0 to 20A
+
-
V IN
0 to 20V
+ V1 -
A1
-
+
Network
Analyzer
CHA
CHB
Figure 6-2. Control Loop Measurement Setup
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Test Procedure
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6.4 Disable (TP11) and Power Good (TP9)
The TPS40195EVM defaults to the Enabled state.
1.
2.
3.
4.
5.
6.
7.
8.
Set up the EVM as described in Section 5.2 and Figure 5-1.
Using a four-channel oscilloscope monitor TP11, TP9, and TP5.
Increase VIN to 8 V.
Set LOAD1 to 10 A.
Short TP11 to TP2. Output should drop to zero.
Remove short. Output should return to regulation.
Repeat steps 4 and 5 above for various VIN and LOAD1 combinations.
See Section 6.6 for equipment shutdown.
See Section 7.6 for typical disable and power good performance.
6.5 Switch Node (TP4) and SYNC (TP12)
1. Set up the EVM as described in Section 5.2 and Figure 5-1.
2. Use the oscilloscope to monitor TP4. Set the oscilloscope to the following:
• 1-MΩ input impedance
• 20-MHz Bandwidth
• AC coupling
• 1-μs/div horizontal resolution
• 5-V/div vertical resolution
3. Increase VIN to 12 V.
4. Set LOAD1 to 10 A.
5. Vary LOAD1 and observe the oscilloscope.
6. Vary VIN and observe the oscilloscope.
7. Set the signal generator to 360 kHz and pulse shape per Figure 6-1.
8. Connect the signal generator to TP12.
9. Monitor TP12 and TP4 with the oscilloscope.
10. Vary signal generator frequency from 360 kHz to 400 kHz.
11. See Section 6.6 for equipment shutdown.
Volts
TF < 100ns
2.5V < V INH < 6.0V
V INL < 0.5V
T < 1/(1.2 x F SW)
Time
Figure 6-3. Typical TPS40195EVM SYNC Signal. The TPS40195 Synchronizes on the Falling Edge.
6.6 Equipment Shutdown
1.
2.
3.
4.
10
Shut down the oscilloscope.
Shut down LOAD1.
Shut down VIN.
Shut down the fan.
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TPS40195EVM Typical Performance Data and Characteristic Curves
7 TPS40195EVM Typical Performance Data and Characteristic Curves
Figure 7-1 through Figure 7-10 present typical performance curves for the TPS40195EVM. Since actual
performance data can be affected by measurement techniques and environmental variables, these curves are
presented for reference and may differ from actual field measurements.
7.1 Line and Load Regulation
OUTPUT VOLTAGE
vs
LOAD CURRENT
3.33
3.32
12V
VOUT - Output Voltage - V
8V
3.31
3.30
20V
3.29
3.28
3.27
0
2
4
6
8
10
12
14
16
18
20
IOUT - Load Current - A
Figure 7-1. TPS40195EVM Line and Load Regulation VIN = 8 V to 20 V, VOUT = 3.3 V, IOUT = 0 A to 20 A
7.2 Efficiency
EFFICIENCY
vs
LOAD CURRENT
100
h - Efficiency - %
80
12V
8V
20V
60
40
0
1 2.5
4 5.5 7 8.5 10 11.5 13 14.5 16 17.5 19
IOUT - Load Current - A
Figure 7-2. TPS40195EVM Efficiency VIN = 8 V to 20 V, VOUT = 3.3 V, IOUT = 1 A to 20 A
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TPS40195EVM Typical Performance Data and Characteristic Curves
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7.3 Output Voltage Ripple
Figure 7-3. TPS40195EVM Output Voltage Ripple (VIN = 12 V, IOUT = 20 A)
7.4 Transient Response
Figure 7-4. TPS40195EVM Transient Response, VIN Figure 7-5. TPS40195EVM Transient Response, VIN
= 12 V, IOUT = 20 A to 4 A, Ch1: IOUT, Ch2: VOUT
= 12 V, IOUT = 4 A to 20 A, Ch1: IOUT, Ch2: VOUT
12
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TPS40195EVM Typical Performance Data and Characteristic Curves
7.5 Bode Plots
Gain/Phase
vs
Frequency
Gain/Phase
vs
Frequency
45
90
-15
-30
45
Phase
-45
Gain - dB
0
Phase °
Gain - dB
Gain
15
Gain
30
135
30
135
15
0
90
-15
Phase - °
45
-60
100
180
60
180
60
Phase
-30
45
-45
1000
10000
100000
0
1000000
-60
100
1000
10000
100000
0
1000000
Frequency - Hz
Frequency - Hz
Figure 7-6. TPS40195EVM Bode Plot VIN = 12 V,
IOUT = 20 A, Crossover Frequency = 48 kHz, Phase
Margin = 57.5°
Figure 7-7. TPS40195EVM Bode Plot VIN = 12 V,
IOUT = 0 A, Crossover Frequency = 46 kHz, Phase
Margin = 62°
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TPS40195EVM Typical Performance Data and Characteristic Curves
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7.6 Test Point Waveforms
Figure 7-9. TPS40195EVM Enable and Power Good,
Figure 7-8. TPS40195EVM Disable and Power
VIN = 12 V, IOUT = 10 A, Ch1: TP1 (VIN), Ch2: TP5
Good, VIN = 12 V, IOUT = 10 A, Ch1: TP1 (VIN), Ch2:
(VOUT), Ch3: TP11 (ENABLE); Ch4: TP9 (Power
TP5 (VOUT), Ch3: TP11 (ENABLE); Ch4: TP9 (Power
Good)
Good)
Figure 7-10. TPS40195EVM Switching Waveform (Ch1: TP4) and Synchronization (Ch2: TP12) VIN = 12 V,
IOUT = 10 A, fSYNC = 400 kHz
14
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EVM Assembly Drawings and Layout
8 EVM Assembly Drawings and Layout
The following figures (Figure 8-1 through Figure 8-3) show the design of the TPS40195EVM printed circuit
board. The EVM has been designed using a 2-layer, 2-oz copper-clad circuit board with all components on the
top side. Moving components to both sides of the PCB or using additional internal layers can offer additional size
reduction for space constrained systems.
Figure 8-1. TPS40195EVM Component Placement (Viewed from Top)
Figure 8-2. TPS40195EVM Top Copper (Viewed from Top)
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EVM Assembly Drawings and Layout
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Figure 8-3. TPS40195EVM Bottom Copper (X-ray Viewed from Top)
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List of Materials
9 List of Materials
Table 9-1 lists the EVM components as configured according to the schematic shown in Figure 4-1.
Table 9-1. TPS40195EVM List of Materials
COUNT
REF DES
0
C1, C2, C7, C8, C11,
C19, C27
DESCRIPTION
MFR
PART NUMBER
Capacitor, aluminum, 20% (UE Series)
Panasonic
EEF-UEvvxxxR
1
C12
Capacitor, ceramic, 1.0 μF, 6.3 V, X7R, 10%, 0603
Std
Std
0
C13
Capacitor, ceramic, OPEN
Std
Std
6
C14, C15, C16, C17,
C18, C25
Capacitor, ceramic, 47 μF, 6.3 V, X5R, 20%, 1210
Std
Std
1
C20
Capacitor, ceramic, 4700 pF, 50 V, [X7R, 10%, 0603
Std
Std
1
C21
Capacitor, ceramic, 10 μF, 6.3 V, X5R, 10%, 0603
Std
Std
1
C22
Capacitor, ceramic, 680 pF, 50 V, X7R, 10%, 0603
Std
Std
1
C23
Capacitor, ceramic, 100 pF, 50 V, COG, 5%, 0603
Std
Std
1
C24
Capacitor, ceramic, 10 pF, 50 V, NPO, 5%, 0603
Std
Std
1
C26
Capacitor, aluminum, 25 V, ±20%, 160 mΩ
Panasonic
EEVFK1E331P
5
C3, C4, C5, C9, C10
Capacitor, ceramic, 10 μF, 25 V, X7R, 20%, 1210
Std
Std
1
C6
Capacitor, ceramic, 1.0 μF, 25 V, X7R, 10%, 0805
Std
Std
1
L1
Inductor, SMT, 27 A, 3.0 mΩ
Vishay
IHLP5050FDER1R5M01
2
Q1, Q2
MOSFET, N-channel, 30 V, 11 A, 9.1 mΩ
IR
IRF7821
2
Q3, Q4
MOSFET, N-channel, 30 V, 16 A, 4.0 mΩ
IR
IRF7832
3
R1, R10, R12
Resistor, chip, 100 kΩ, 1/16 W, 1%
Std
Std
1
R11
Resistor, chip, 1.30 kΩ, 1/16 W, 1%
Std
Std
1
R13
Resistor, chip, 3.01 kΩ, 1/16 W, 1%
Std
Std
1
R14
Resistor, chip, 22.1 kΩ, 1/16 W, 1%
Std
Std
1
R17
Resistor, chip, 10.0 kΩ, 1/16 W, 1%
Std
Std
0
R18, R19, R20, R21
Resistor, chip, xxx Ω, 1/16 W, 1%
Std
Std
1
R2
Resistor, chip, 200 kΩ, 1/16 W, 1%
Std
Std
1
R22
Resistor, chip, 0 Ω, 1/16 W
Std
Std
1
R26
Resistor, chip, 0.15 Ω, 1/8 W, 5%
Std
Std
4
R3, R8, R15, R16
Resistor, chip, 1.0 Ω, 1/16 W, 5%
Std
Std
1
R4
Resistor, chip, 2.0 Ω, 1/16 W, 5%
Std
Std
1
R5
Resistor, chip, 1.0 Ω, 1210, 5%
Std
Std
1
R6
Resistor, chip, 42.2 kΩ, 1/16 W, 1%
Std
Std
1
R7
Resistor, chip, 82.5 kΩ, 1/16 W, 1%
Std
Std
1
R9
Resistor, chip, 49.9 kΩ, 1/16 W, 1%
Std
Std
1
U1
TPS40195, 4.5-V to 20-V Sync buck controller with sync
and pgood
TI
TPS40195RGY
10 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (July 2008) to Revision B (January 2022)
Page
• Updated the numbering format for tables, figures, and cross-references throughout the document. ................2
• Updated the user's guide title............................................................................................................................. 2
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IMPORTANT NOTICE AND DISCLAIMER
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AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY
IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD
PARTY INTELLECTUAL PROPERTY RIGHTS.
These resources are intended for skilled developers designing with TI products. You are solely responsible for (1) selecting the appropriate
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