Texas Instruments TPS56221EVM-579 User manual

User’s Guide
TPS56221 Step-Down Converter Evaluation Module User's
Guide
Table of Contents
1 Introduction.............................................................................................................................................................................3
2 Description.............................................................................................................................................................................. 4
2.1 Applications........................................................................................................................................................................4
2.2 Features............................................................................................................................................................................. 4
3 Electrical Performance Specifications................................................................................................................................. 5
4 Schematic................................................................................................................................................................................6
5 Test Setup................................................................................................................................................................................7
5.1 Test Equipment.................................................................................................................................................................. 7
5.2 Recommended Wire Gauge...............................................................................................................................................7
5.3 Equipment Set Up Procedure............................................................................................................................................ 8
6 Configurations........................................................................................................................................................................ 9
6.1 Enable Selection (J3)......................................................................................................................................................... 9
7 Test Point Descriptions........................................................................................................................................................ 10
7.1 Input Voltage Monitoring (TP1 and TP2)..........................................................................................................................10
7.2 Output Voltage Monitoring (TP3 and TP4)....................................................................................................................... 10
7.3 Enable/Soft-start Monitoring (TP5)...................................................................................................................................10
7.4 Power Good Monitoring (TP6)......................................................................................................................................... 10
7.5 Loop Response Testing (TP7, TP8, TP9 and TP10)........................................................................................................10
7.6 Switch Node Voltage Monitoring (TP11 and TP12)..........................................................................................................10
8 Test Procedures.................................................................................................................................................................... 11
8.1 Start Up/Shut Down Procedure........................................................................................................................................ 11
8.2 Output Ripple Voltage Measurement Procedure..............................................................................................................11
8.3 Control Loop Gain and Phase Measurement Procedure................................................................................................. 12
8.4 Equipment Shutdown....................................................................................................................................................... 12
9 Performance Data and Typical Characteristic Curves...................................................................................................... 13
9.1 Efficiency..........................................................................................................................................................................13
9.2 Load Regulation............................................................................................................................................................... 13
9.3 Line Regulation................................................................................................................................................................ 14
9.4 Output Voltage Ripple...................................................................................................................................................... 14
9.5 Switch Node..................................................................................................................................................................... 15
9.6 Load Transient................................................................................................................................................................. 15
9.7 Start Up............................................................................................................................................................................ 16
9.8 Power Off......................................................................................................................................................................... 17
9.9 Over-Current Protection................................................................................................................................................... 17
9.10 Control Loop Bode Plot.................................................................................................................................................. 18
9.11 Thermal Image............................................................................................................................................................... 18
10 EVM Assembly Drawings and PCB Layout...................................................................................................................... 19
11 List of Materials...................................................................................................................................................................22
12 Revision History................................................................................................................................................................. 22
List of Figures
Figure 4-1. TPS56221EVM-579 Schematic.................................................................................................................................6
Figure 5-1. TPS56221EVM-579 Recommended Test Setup....................................................................................................... 8
Figure 8-1. Tip and Barrel Output Voltage Ripple Measurement............................................................................................... 11
Figure 8-2. Control Loop Measurement Setup.......................................................................................................................... 12
Figure 9-1. Efficiency................................................................................................................................................................. 13
Figure 9-2. Load Regulation...................................................................................................................................................... 13
Figure 9-3. Line Regulation (VIN = 8 V to 14 V, VOUT = 1.0 V, IOUT = 25 A).......................................................................... 14
Figure 9-4. Output Voltage Ripple (VIN = 12 V, VOUT = 1.0 V, IOUT = 25 A)...........................................................................14
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Figure 9-5. Switch Node Waveform Measured at Pins Using Tip and Barrel Measurement Technique (VIN = 12 V, VOUT
= 1.0 V, IOUT = 25 A).............................................................................................................................................................15
Figure 9-6. Load Transient (VIN = 12 V, VOUT = 1.0 V, IOUT = 0 A to 25 A)........................................................................... 15
Figure 9-7. Start-Up Waveform (VIN = 12 V, VOUT = 1.0 V, IOUT = 25 A)...............................................................................16
Figure 9-8. Pre-Biased Start-Up Waveform (VIN = 12 V, VOUT = 1.0 V, IOUT = 0 A).............................................................. 16
Figure 9-9. Power-Off Waveform (VIN = 12 V, VOUT = 1.0 V, IOUT = 25 A)............................................................................ 17
Figure 9-10. Over-Current Protection Waveform (Ch1: VIN, Ch2: EN/SS, Ch3: VOUT, Ch4: IOUT (10 A/div), VIN = 12 V,
VOUT = 1.0 V, IOUT = 36 A)..................................................................................................................................................17
Figure 9-11. Loop Gain (VIN = 12 V, VOUT = 1.0 V, IOUT = 25 A, Bandwidth: 51 kHz, Phase Margin: 48°)............................18
Figure 9-12. Thermal Image (VIN = 14 V, VOUT = 1.0 V, IOUT = 25 A, without airflow)...........................................................18
Figure 10-1. TPS56221EVM-579 Top Assembly Drawing (top view)........................................................................................ 19
Figure 10-2. TPS56221EVM-579 Bottom Assembly Drawing (bottom view).............................................................................19
Figure 10-3. TPS56221EVM-579 Top Copper (top view).......................................................................................................... 20
Figure 10-4. TPS56221EVM-579 Internal 1 (top view)..............................................................................................................20
Figure 10-5. TPS56221EVM-579 Internal 2 (top view)..............................................................................................................21
Figure 10-6. TPS56221EVM-579 Bottom Copper (top view).....................................................................................................21
List of Tables
Table 3-1. TPS56221EVM-579 Electrical Performance Specifications........................................................................................5
Table 7-1. Test Point Descriptions............................................................................................................................................. 10
Table 11-1. TPS56221EVM-579 List of Materials...................................................................................................................... 22
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1 Introduction
The TPS56221EVM-579 evaluation module (EVM) is a synchronous buck converter providing a fixed 1.0-V
output at up to 25 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 TPS56221 High-Current Synchronous Buck
Converter with integrated MOSFETs.
The TPS56221 integrates TI’s high performance controller technology with TI’s industry leading MOSFET
technology in a standard QFN package to meet the demands of modern, high-current, and space constrained
applications.
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2 Description
TPS56221EVM-579 is designed to use a regulated 12-V (8-V to 14-V) bus voltage to provide a regulated 1.0-V
output at up to 25 A of load current. TPS56221EVM-579 is designed to demonstrate the TPS56221 high-current
integrated FET converter in a typical space-limited, 12-V bus to low-voltage point-of-load application.
2.1 Applications
• High-Current, Low-Voltage FPGA or Micro Controller Core Supplies
• High-Current Point-of-Load Modules
• Telecommunications Equipment
• Computer Peripherals
2.2 Features
• 8-V to 14-V Input Voltage Rating
• 1.0-V ±2% Output Voltage Rating
• 25-A Steady-State Load Current
• 500-kHz Switching Frequency
• Simple Access to Power Good, Enable/Soft-Start and Error Amplifier
• Convenient Converter Performance Test Points
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3 Electrical Performance Specifications
Table 3-1. TPS56221EVM-579 Electrical Performance Specifications
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Input Characteristics
VIN Input voltage 8 12 14 V
IIN Input current VIN = 12 V, IOUT = 25 A 2.42 A
No load input current VIN = 12 V, IOUT = 0 A 43 mA
VIN_UVLO Input UVLO IOUT = 25 A 4.2 V
Output Characteristic
VOUT Output voltage VIN = 8 V to 14 V, IOUT = 0 A to 25 A 0.98 1.0 1.02 V
Line regulation VIN = 8 V to 14 V, IOUT = 25 A 0.1%
Load regulation VIN = 12 V, IOUT = 0 A to 25 A 1%
VRIPPLE Output voltage ripple VIN = 12 V, IOUT = 25 A 20 mVPP
IOUT Output current VIN = 8 V to 14 V 0 25 A
Systems Characteristics
fSW Switching frequency 450 500 550 kHz
ηpk Peak efficiency VIN = 12 V, IOUT = 13 A 89.6%
η Full-load efficiency VIN = 12 V, IOUT = 25 A 87.1%
Operating temperature 25 °C
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4 Schematic
+
Figure 4-1. TPS56221EVM-579 Schematic
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5 Test Setup
5.1 Test Equipment
5.1.1 Voltage Source
VIN: The input voltage source (VIN) shall be a 0-V to 15-V variable DC source capable of supplying 4 ADC.
5.1.2 Meters
•A1: Input current meter (0 ADC to 4 ADC).
•V1: Input voltage meter (0 V to 15 V).
•V2: Output voltage meter (0 V to 2 V).
5.1.3 Load
LOAD: Output load. Electronic load set for constant current or constant resistance mode, capable of 0 ADC to 25
ADC at 1.0 VDC.
5.1.4 Oscilloscope
For Output Voltage Ripple: Oscilloscope shall be an analog or digital oscilloscope set for AC coupled
measurement with 20-MHz bandwidth limiting. Use 20-mV/div vertical resolution, 1.0-µs/div horizontal resolution.
For Switching Waveforms: Oscilloscope shall be an analog or digital Oscilloscope set for DC coupled
measurement with 20-MHz bandwidth limiting. Use 2-V/div or 5-V/div vertical resolution and 1.0-µs/division
horizontal resolution.
5.1.5 Fan
The TPS56221EVM-579 Evaluation Module includes components that can get hot to touch when operating.
Because this evaluation module is not enclosed to allow probing of circuit nodes, a small fan capable of 200 lfm
to 400 lfm is recommended to reduce component temperatures when operating.
5.2 Recommended Wire Gauge
5.2.1 VIN to J1
The connection between the source voltage (VIN) and J1 of TPS56221EVM-579 can carry as much as 4 ADC of
current. The minimum recommended wire size is AWG #16 with the total length of wire less than 2 feet (1 foot
input, 1 foot return)
5.2.2 J2 to LOAD
The connection between the LOAD and J2 of TPS56221EVM-579 can carry as much as 25 ADC of current. The
minimum recommended wire size is 2xAWG #14 with the total length of wire less than 2 feet (1 foot input, 1 foot
return).
Note
J2 is a 4 position terminal jack using positions for each VOUT and GND. Each position is rated to
support 15 A of output current. When delivering more than 15 A of current, both VOUT and both GND
positions should be used.
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5.3 Equipment Set Up Procedure
Figure 5-1 is the recommended test setup to evaluate the TPS56221EVM-579.
T
I
EXAS
NSTRUMENTS
LOAD
1.0V @
25A
-
+
FAN
V2
-
+
A1
-
+
DC
source
VIN
V1
-
+
Figure 5-1. TPS56221EVM-579 Recommended Test Setup
1. Working at an ESD workstation, make sure that any wrist straps, bootstraps and mats are connected
referencing the user to earth ground before power is applied to the EVM. Wearing electrostatic smock and
safety glasses is also recommended.
2. Prior to connecting the DC input source, VIN, it is advisable to limit the source current from VIN to 4.0 A
maximum. Make sure VIN is initially set to 0 V and connected as shown in Figure 5-1.
3. Connect VIN to J1 as shown in Figure 5-1.
4. Connect ammeter A1 between VIN and J1 as shown in Figure 5-1.
5. Connect voltmeter V1 to TP1 and TP2 as shown in Figure 5-1.
6. Connect voltmeter V2 to TP3 and TP4 as shown in Figure 5-1.
7. Place the fan as shown in Figure 5-1 and turn it on, ensuring that the air blows directly across the evaluation
module.
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6 Configurations
6.1 Enable Selection (J3)
The converter can be enabled and disabled by J3. Shorting J3 discharges the soft-start capacitor and disables
the TPS56221 converter. Opening J3 enables the TPS56221 converter.
Default setting: short to disable the converter.
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7 Test Point Descriptions
Table 7-1. Test Point Descriptions
TEST POINT LABEL DESCRIPTION
TP1 VIN Measurement test point for input voltage
TP2 GND Ground test point for input voltage
TP3 VOUT Measurement test point for output voltage
TP4 GND Ground test point for output voltage
TP5 EN/SS Measurement test point for enable/soft-start
TP6 PGOOD Measurement test point for power good
TP7 CHA Measurement test point for channel A of loop response
TP8 SGND Ground test point for channel A of loop response
TP9 SGND Ground test point for channel B of loop response
TP10 CHB Measurement test point for channel B of loop response
TP11 SW Measurement test point for switch node voltage
TP12 GND Ground test point for switch node voltage
7.1 Input Voltage Monitoring (TP1 and TP2)
TPS56221EVM-579 provides two test points for measuring the input voltage applied to the module. This allows
the user to measure the actual input module voltage without losses from input cables and connectors. To use
TP1 and TP2, connect a voltmeter positive input terminal to TP1 and negative input terminal to TP2.
7.2 Output Voltage Monitoring (TP3 and TP4)
TPS56221EVM-579 provides two test points for measuring the output voltage generated by the module. To use
TP3 and TP4, connect a voltmeter positive input terminal to TP3 and negative input terminal to TP4. For output
ripple monitoring, please refer to the tip and barrel measurement technique in Section 8.2.
7.3 Enable/Soft-start Monitoring (TP5)
TPS56221EVM-579 provides a test point for measuring the enable/soft-start voltage of the TPS56221 converter.
This test point can be monitored to observe the start-up calibration waveform, soft-start ramp or fault time-out
timing.
The enable/soft-start test point should not be actively driven from an external circuit, such as a logic output of
another power supply.
7.4 Power Good Monitoring (TP6)
TPS56221EVM-579 provides a test points for measuring the Power Good voltage of the TPS56221 converter.
7.5 Loop Response Testing (TP7, TP8, TP9 and TP10)
TPS56221EVM-579 provides four test points (two signals and two grounds) for measuring the control loop
frequency response. This allows the user to measure the actual module loop response without modifying the
evaluation board. See Section 8.3 for additional detail.
7.6 Switch Node Voltage Monitoring (TP11 and TP12)
TPS56221EVM-579 provides two test points for measuring the switch node. To monitor the switch node voltage,
set oscilloscope per Oscilloscope For Switching Waveforms in Section 5.1.4. Connect the oscilloscope probe to
TP11 and the ground lead of the probe to TP12. To monitor the voltage spike on switch node, please remove
the bandwidth limit on the oscilloscope and refer to the Application Report SLPA005 (Reducing Ringing Through
PCB Layout Techniques) for the measurement techniques.
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8 Test Procedures
8.1 Start Up/Shut Down Procedure
1. Set up the EVM as described in Section 5.3 and Figure 5-1.
2. Ensure LOAD is set to sink 0 ADC.
3. Ensure jumper J3 set per Section 6.1.
4. Increase VIN from 0 VDC to 12 VDC. Using V1 to measure VIN voltage.
5. Open jumper J3 to enable the converter.
6. Use V2 to measure VOUT voltage, A1 to measure VIN voltage.
7. Vary LOAD from 0 ADC to 25 ADC, VOUT should remain in load regulation.
8. Vary VIN from 8 V to 14 V, VOUT should remain in line regulation.
9. Short jumper J3 to disable the converter.
10. Decrease VIN to 0 V.
11. Decrease LOAD to 0 A.
8.2 Output Ripple Voltage Measurement Procedure
1. Follow Section 8.1 to set VIN and LOAD to desired operating condition.
2. Set oscilloscope for Output Voltage Ripple Measurement in Section 5.1.4.
3. Connect oscilloscope probe with exposed metal barrel to TP3 and TP4 per Figure 8-1. Using a leaded
ground connection may induce additional noise due to the large ground loop.
4. Follow Section 8.1 to power down.
TP4TP3
Metal Ground Barrel
Probe Tip
Tip and Barrel VOUT ripple
measurement
Figure 8-1. Tip and Barrel Output Voltage Ripple Measurement
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8.3 Control Loop Gain and Phase Measurement Procedure
1. Follow Section 8.1 to set VIN and LOAD to desired operating condition.
2. Connect isolation transformer to test points TP7 and TP10 as shown in Figure 8-2.
3. Connect input signal amplitude measurement probe (Channel A) to TP7 as shown in Figure 8-2.
4. Connect output signal amplitude measurement probe (Channel B) to TP10 as shown in Figure 8-2.
5. Connect ground lead of Channel A and Channel B to TP8 and TP9 as shown in Figure 8-2, respectively.
6. Inject 10 mV or less signal through the isolation transformer.
7. Sweep the frequency from 500 Hz to 500 kHz with 10-Hz or lower post filter.
8. Control loop gain can be measured by
ChannelB
20 log ChannelA
æ ö
´ç ÷
è ø
.
9. Control loop phase can be measured by the phase difference between Channel A and Channel B.
10. Follow Section Section 8.1 to power down.
T
I
EXAS
NSTRUMENTS
LOAD
1.0V @
25A
-
+
FAN
V2
-
+
A1
-
+
DC
source
VIN
V1
-
+
Network
Analyzer
Isolation
Transformer
CHA CHB Output
Figure 8-2. Control Loop Measurement Setup
8.4 Equipment Shutdown
1. Shut down VIN.
2. Shut down LOAD.
3. Shut down fan.
4. Shut down oscilloscope.
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9 Performance Data and Typical Characteristic Curves
Figure 9-1 through Figure 9-12 present typical performance curves for the TPS56221EVM-579. 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.
9.1 Efficiency
50
55
60
65
70
75
80
85
90
95
0 5 10 15 20 25
ILOAD - Load Current - A
- Efficiency - %
VIN = 8 V
VIN = 12 V
VIN = 14 V
Figure 9-1. Efficiency
9.2 Load Regulation
0.98
0.985
0.99
0.995
1
1.005
1.01
1.015
1.02
0 5 10 15 20 25
ILOAD - Load Current - A
VOUT - Output Voltage - V
VIN = 8 V
VIN = 12 V
VIN = 14 V
Figure 9-2. Load Regulation
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9.3 Line Regulation
0.98
0.985
0.99
0.995
1
1.005
1.01
1.015
1.02
8 9 10 11 12 13 14
VIN - Input Voltage - V
VOUT - Output Voltage - V
Figure 9-3. Line Regulation (VIN = 8 V to 14 V, VOUT = 1.0 V, IOUT = 25 A)
9.4 Output Voltage Ripple
Figure 9-4. Output Voltage Ripple (VIN = 12 V, VOUT = 1.0 V, IOUT = 25 A)
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9.5 Switch Node
Figure 9-5. Switch Node Waveform Measured at Pins Using Tip and Barrel Measurement Technique (VIN
= 12 V, VOUT = 1.0 V, IOUT = 25 A)
9.6 Load Transient
Figure 9-6. Load Transient (VIN = 12 V, VOUT = 1.0 V, IOUT = 0 A to 25 A)
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9.7 Start Up
Figure 9-7. Start-Up Waveform (VIN = 12 V, VOUT = 1.0 V, IOUT = 25 A)
Figure 9-8. Pre-Biased Start-Up Waveform (VIN = 12 V, VOUT = 1.0 V, IOUT = 0 A)
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9.8 Power Off
Figure 9-9. Power-Off Waveform (VIN = 12 V, VOUT = 1.0 V, IOUT = 25 A)
9.9 Over-Current Protection
Figure 9-10. Over-Current Protection Waveform (Ch1: VIN, Ch2: EN/SS, Ch3: VOUT, Ch4: IOUT (10 A/div),
VIN = 12 V, VOUT = 1.0 V, IOUT = 36 A)
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9.10 Control Loop Bode Plot
Figure 9-11. Loop Gain (VIN = 12 V, VOUT = 1.0 V, IOUT = 25 A, Bandwidth: 51 kHz, Phase Margin: 48°)
9.11 Thermal Image
Figure 9-12. Thermal Image (VIN = 14 V, VOUT = 1.0 V, IOUT = 25 A, without airflow)
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10 EVM Assembly Drawings and PCB Layout
The following figures (Figure 10-1 through Figure 10-6) show the design of the TPS56221EVM-579 printed
circuit board. The EVM has been designed using a 4-layer, 2-oz copper-clad circuit board 2.5” x 2.5” with
components on both sides of the PCB to allow the user to view, probe and evaluate the TPS56221 high current
converter with integrated FETs in a small form factor, high-current application.
T
I
EXAS
NSTRUMENTS
Figure 10-1. TPS56221EVM-579 Top Assembly Drawing (top view)
Figure 10-2. TPS56221EVM-579 Bottom Assembly Drawing (bottom view)
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Figure 10-3. TPS56221EVM-579 Top Copper (top view)
Figure 10-4. TPS56221EVM-579 Internal 1 (top view)
EVM Assembly Drawings and PCB Layout www.ti.com
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