Texas Instruments TPS53316EVM-075 User manual

Using the TPS53316EVM-075
User's Guide
Literature Number: SLUU671
December 2011

User's Guide
SLUU671–December 2011
5-A Step-Down Regulator with Integrated Switcher
1 Introduction
The TPS53316EVM-075 evaluation module (EVM) is a step-down regulator featuring TPS53316. The
TPS53316 is a fully integrated step-down regulator employing voltage mode control.
2 Description
The TPS53316EVM-075 is designed to use a 3.3-V or 5-V voltage rail to produce a regulated 1.5-V output
at up to 5-A load current. The TPS53316EVM-075 is designed to demonstrate the TPS53316 in a typical
low voltage application while providing a number of test points to evaluate the performance of the
TPS53316.
2.1 Typical Applications
•Low-Voltage Applications for 5-V Step-Down Rails
•Low-Voltage Applications for 3.3-V Step-Down Rails
2.2 Features
The TPS53316EVM-075 features:
•Continuous 5-A Output Current Capability
•Supports all MLCC Output Capacitors
•Voltage Mode Control
•Selectable Light-Load Operation Modes (Forced Continuous Conduction Mode (FCCM),
Diode-Emulation (DE) Mode and High-Efficiency (HEF) Mode)
•Selectable Switching Frequency Settings (750 kHz, 1.1 MHz, and 2.0 MHz)
•Selectable Overcurrent Threshold
•Soft-Stop Output Discharge During Disable
•Over Current, Over Voltage, Under voltage and Over Temperature Protections
•Power Good Indication
•Pre-Bias Output Voltage Start Up
•Convenient Test Points for Probing Critical Waveforms
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www.ti.com Electrical Performance Specifications
3 Electrical Performance Specifications
Table 1. TPS53316EVM-075 Electrical Performance Specifications
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Input Characteristics
Voltage range VIN 2.9 3.3/5.0 6.0 V
Maximum input current VIN = 5 V, IOUT = 5 A 1.76 A
No load input current VIN = 5 V, IOUT = 0 A under DE/HEF mode 3 mA
Output Characteristics
Output voltage 1.5 V
Output voltage regulation Setpoint accuracy -1% 1%
(VIN = 2.9 V –6.0 V, IOUT = 0 A –5 A)
Line regulation 0.1%
(VIN = 2.9 V –6.0 V, IOUT = 5 A)
Load regulation 0.1%
(VIN = 5 V, IOUT = 0 A –5 A)
Output voltage ripple VIN = 5 V, IOUT = 5 A 10 mVPP
Output load current 0 5 A
Over current limit VIN = 3.3V, fSW = 750 kHz 6.5/4.5
Systems Characteristics
Switching frequency 0.75/1.1/ MHz
2.0
Peak efficiency VIN = 5 V, IOUT = 1.8 A, fSW = 750 kHz 92.7%
Full-load efficiency VIN = 5 V, IOUT = 5 A, fSW = 750 kHz 89.0%
Operating temperature 25 ºC
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1 1
1
1
1 1 1 1
1
57.6k (default)
174k
57.6k
24.3k (default)
FCCM
HEF Mode
Mode
105k
174k
24.3k
GND
105k
GND
DE Mode
Notes:
Pull High/ Float 1.1MHz, 4.5A OCP
2MHz, 6.5A OCP
750kHz, 6.5A OCP
750kHz, 4.5A OCP
Frequency/OCP
Connection
Pull High/ Float
DE Mode, 4X S.S.Time
HEF Mode, 4X S.S.Time
Connection
NOT POPULATED
2MHz, 4.5A OCP
1.1MHz, 6.5A OCP
FCCM , 4X S.S.Time
VIN
GND
2.9V - 6V
VOUT
GND
1.5V/5A
VIN
GND
VOUT
GND
VREG3
GND
EN
PGD
CHA CHB
GND
SW
Control Loop
Injection & Measuring
Open to Enable
C6
1
2
J4
TP11
C8
22uF
R8
0
C4
1.0uF
TP12
R13
0
C18
0.1uF
C1
3.3nF
R2
2.0k
TP1 TP2
TP10
TP7
TP9
TP3
R7
2.0k
R5
49.9
L1
1.0uH
C11
22uF
C13
22uF
C15 C17
C5
R14
10.0k
C7
22uF
C9
0.1uF
TP4
TP8
R9
1.33k
R3
10.0
R19
R17
105k
R15
24.3k
1
2
J3
R11
R6
105k
R1
24.3k
1
2
J2
C3
100pF
C10
22uF
C12
22uF
C2
3.3nF
R18
174k
R10
174k
R16
57.6k
C14 C16
R4
57.6k
1
2
3
4
5
6
7
8
9
10
11
12
J1
1
2
3
4
5
6
7
8
9
10
11
12
J5
R12
2.0
C19
1.0nF
TP6
TP5
1EN
2RF/OC
3PGD
4VBST
5
SW
6
SW
7
SW
8
PS
9
COMP
10
FB
11
AGND
12
VREG3
13
VIN
14
VIN
15
PGND
16
PGND
17
PGND
U1
TPS53316RGT
VIN
PGD
EN
VOUT
VOUT
PWRGND
PWRGND
Schematic www.ti.com
4 Schematic
Figure 1. TPS53316EVM-075 Schematic
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TP7 TP10
www.ti.com Test Setup
5 Test Setup
5.1 Test Equipment
Voltage Source, VIN: The input voltage source VIN should be a 0-V to 6-V variable DC source capable of
supplying 5 ADC. Connect VIN to J2 as shown in Figure 3.
Multimeters:
•V1: VIN at TP6 (VIN) and TP9 (GND), 0-V to 6-V voltmeter
•V2: VOUT at TP7 (VOUT) and TP10 (GND)
•A1: VIN input current, 0-ADC to 5-ADC Ammeter
Output Load: The output load should be an electronic constant resistance mode load capable of 0 ADC to
5 ADC at 1.5 V.
Oscilloscope: A digital or analog oscilloscope can be used to measure the output ripple. The oscilloscope
should be set for 1-MΩimpedance, 20-MHz bandwidth, AC coupling, 1-µs/division horizontal resolution for
750-kHz switching frequency, 20-mV/division vertical resolution. Test points TP7 and TP10 can be used to
measure the output ripple voltage by placing the oscilloscope probe tip through TP7 and holding the
ground barrel on TP10 as shown in Figure 2. Using a leaded ground connection may induce additional
noise due to the large ground loop.
Figure 2. Tip and Barrel Measurement for VOUT Ripple
Fan: Some of the components in this EVM may approach temperatures of 55ºC during operation. A small
fan capable of 200 LFM to 400 LFM is recommended to reduce component temperatures while the EVM is
operating. The EVM should not be probed while the fan is not running.
Recommended Wire Gauge:
•VIN to J2: The recommended wire size is 1x AWG #14 per input connection, with the total length of
wire less than 4 feet (2 feet input, 2 feet return).
•J3 to LOAD: The minimum recommended wire size is 1x AWG #14, with the total length of wire less
than 4 feet (2 feet output, 2 feet return)
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FAN
A1
-
+
V
VIN
V2
+
-
-
+
LOAD
1.5V @
5A
V1
+
-
Test Setup www.ti.com
5.2 Recommended Test Setup
Figure 3 is the recommended test set up to evaluate the TPS53316EVM-075. 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.
Input Connections:
1. Prior to connecting the DC input source VIN, it is advisable to limit the source current from VIN to 5 A
maximum. Make sure VIN is initially set to 0 V and connected to J2 as shown in Figure 3.
2. Connect a current meter A1 between VIN and J2 to measure the input current.
3. Connect a voltmeter V1 at TP6 (VIN) and TP9 (GND) to measure the input voltage.
Output Connections:
1. Connect Load to J3 and set Load to constant resistance mode to sink 0 ADC before VIN is applied.
2. Connect a voltmeter V2 at TP7 (VOUT) and TP10 (GND) to measure the output voltage.
Other Connections: Place a Fan as shown in Figure 3 and turn on, making sure air is flowing across the
EVM.
Figure 3. TPS53316EVM-075 Recommended Test Set Up
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www.ti.com Configurations
6 Configurations
The user can configure this EVM per following configurations. Jumper J1 and J5 configurations should be
made prior to applying power to the EVM.
6.1 Mode Selection
The MODE can be set by J1.
6.1.1 Default Setting: HEF Mode, 4X S.S. Time
Table 2. MODE Selection
MODE RESISTANCES (kΩ) MODE
GND FCCM, 4X S.S. Time
24.3 HEF Mode, 4X S.S. Time
57.6 HEF Mode
105 DE Mode
174 DE Mode, 4X S.S. Time
Open FCCM
6.2 Enable Selection
The controller can be enabled and disabled by J4.
6.2.1 Default Setting: Short to Disable the Controller
6.3 Switching Frequency and OCP Selection
The switching frequency and OCP threshold can be set by J5.
6.3.1 Default Setting: 750 kHz, 6.5-A OCP
Table 3. Switching Frequency and OCP Selection
MODE RESISTANCES SWITCHING FREQUENCY OVERCURRENT THRESHOLD
GND 1.1 MHz 6.5 A
24.3 kΩ750 kHz 4.5 A
57.6 kΩ750 kHz 6.5 A
105 kΩ2.0 MHz 4.5 A
174 kΩ2.0 MHz 6.5 A
Open 1.1 MHz 4.5 A
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Test Procedure www.ti.com
7 Test Procedure
7.1 Line/Load Regulation and Efficiency Measurement Procedure
1. Set up EVM as described in Section 5 and Figure 3.
2. Ensure load is set to constant resistance mode and to sink 0 ADC.
3. Ensure all jumpers set per Section 6.
4. Increase VIN from 0 V to 5 V. Using V1 to measure VIN voltage.
5. Open jumper J4 to enable the controller.
6. Use V2 to measure VOUT voltage, A1 to measure VIN current.
7. Vary Load from 0 ADC to 5 ADC, VOUT should remain in load regulation.
8. Vary VIN from 2.9 V to 6.0 V, VOUT should remain in line regulation.
9. Short jumper J4 to disable the controller.
10. Decrease Load to 0 A.
11. Decrease VIN to 0 V.
7.2 Control Loop Gain and Phase Measurement Procedure
TPS53316EVM-075 contains a 10-Ωseries resistor in the feedback loop for loop response analysis.
1. Set up EVM as described in Section 5 and Figure 3.
2. Connect isolation transformer to test points marked TP1 and TP2.
3. Connect input signal amplitude measurement probe (channel A) to TP1. Connect output signal
amplitude measurement probe (channel B) to TP2.
4. Connect ground lead of channel A and channel B to TP5.
5. Inject around 20-mV or less signal through the isolation transformer.
6. Sweep the frequency from 500 Hz to 500 kHz with 10-Hz or lower post filter. The control loop gain and
phase margin can be measured.
7. Disconnect isolation transformer from bode plot test points before making other measurements (signal
injection into feedback may interfere with accuracy of other measurements).
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7.3 List of Test Points
Table 4. The Functions of Each Test Points
TEST POINTS NAME DESCRIPTION
TP1 CHA Input A for Loop Injection
TP2 CHB Input B for Loop Injection
TP3 VREG3 3.3-V Internal LDO Output
TP4 GND GND
TP5 GND GND
TP6 VIN Input Voltage
TP7 VOUT Output Voltage
TP8 SW Switching Node
TP9 GND GND
TP10 GND GND
TP11 EN Enable Pin
TP12 PGD Power Good Output
7.4 Equipment Shutdown
1. Shut down VIN.
2. Shut down Load.
3. Shut down FAN.
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70
75
80
85
90
95
100
012345
ILOAD - Load Current - A
- Efficiency - %
VIN = 3.3 V, FCCM, fsw = 750 kHz
VIN = 3.3 V, DE Mode, fsw = 750 kHz
VIN = 3.3 V, HEF Mode, fsw = 750 kHz
70
75
80
85
90
95
100
0 1 2 3 4 5
ILOAD - Load Current - A
H- Efficiency - %
VIN = 5V, FCCM, fsw = 750 kHz
VIN = 5 V, DE Mode, fsw = 750 kHz
VIN = 5 V, HEF Mode, fsw = 750 kHz
Performance Data and Typical Characteristic Curves www.ti.com
8 Performance Data and Typical Characteristic Curves
Figure 4 through Figure 19 present typical performance curves for TPS53316EVM-075.
8.1 Efficiency
Figure 4. 3.3-V Input Efficiency
Figure 5. 5-V Input Efficiency
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1.49
1.495
1.5
1.505
1.51
0 1 2 3 4 5
ILOAD - Load Current - A
VOUT - Output Voltage - V
FCCM, fsw = 750 kHz, VIN = 5 V
DE Mode, fsw = 750 kHz, VIN = 5 V
HEF Mode, fsw = 750 kHz, VIN = 5 V
1.49
1.495
1.5
1.505
1.51
2.9 3.4 3.9 4.4 4.9 5.4 5.9
VIN - Input Voltage - V
VOUT - Output Voltage - V
FCCM, fsw = 750 kHz, Iout = 0 A
FCCM, fsw =750 kHz, Iout = 5 A
DE Mode, fsw = 1.1 MHz, Iout = 0 A
DE Mode, fsw = 1.1 MHz, Iout = 5 A
HEF Mode, fsw = 2.0 MHz, Iout = 0 A
HEF Mode, fsw = 2.0 MHz, Iout = 5 A
www.ti.com Performance Data and Typical Characteristic Curves
8.2 Load Regulation
Figure 6. Load Regulation
8.3 Line Regulation
Figure 7. Line Regulation
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Performance Data and Typical Characteristic Curves www.ti.com
8.4 Output Transient
Figure 8. Load 0-3A Transient under FCCM
(5-V VIN, 1.5-V VOUT, FCCM, fsw = 750 kHz )
Figure 9. Load 0-3A Transient under HEF Mode
(5-V VIN, 1.5-V VOUT, HEF Mode, fsw = 750 kHz )
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www.ti.com Performance Data and Typical Characteristic Curves
8.5 Output Ripple
Figure 10. Output Ripple
(5-V VIN, 1.5-V VOUT, 5-A, FCCM, fsw = 750 kHz)
Figure 11. Output Ripple
(5-V VIN, 1.5-V VOUT, 0-A, HEF Mode, fsw = 750 kHz )
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Performance Data and Typical Characteristic Curves www.ti.com
8.6 Switching Node
Figure 12. Switching Node
(5-V VIN, 1.5-V VOUT, 5-A, FCCM, fsw = 750 kHz )
Figure 13. Switching Node
(5-V VIN, 1.5-V VOUT, 0-A, HEF Mode, fsw = 750 kHz )
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www.ti.com Performance Data and Typical Characteristic Curves
8.7 Enable Turn On / Turn Off
Figure 14. Turn-On Waveform
( 5-V VIN, 1.5-V VOUT, 5-A IOUT, 4XS.S.)
Figure 15. Turn-Off Waveform
( 5-V VIN, 1.5-V VOUT, 0-A IOUT )
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Performance Data and Typical Characteristic Curves www.ti.com
8.8 Pre-bias Turn-On
Figure 16. Pre-bias Turn-On Waveform
( 5-V VIN, 1.5-V VOUT, 0-A IOUT, 4XS.S., 0.5-V pre-bias)
8.9 Overcurrent Protection
Figure 17. Overcurrent Protection Waveform
( 3.3-V VIN, 1.5-V VOUT, 6.5-A IOUT, 4XS.S., 750 kHz, 6.5-A OCP)
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www.ti.com Performance Data and Typical Characteristic Curves
8.10 Bode Plot
Figure 18. Loop Gain
(5-V VIN, 1.5-V VOUT, 5-A IOUT, HEF Mode, fSW = 750 kHz)
8.11 Thermal Image
Figure 19. Thermal Image
(6-V VIN, 1.5-V VOUT, 5-A IOUT, FCCM Mode, fSW = 2.0 MHz)
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EVM Assembly Drawing and PCB Layout www.ti.com
9 EVM Assembly Drawing and PCB Layout
The following figures (Figure 20 through Figure 25) show the design of the TPS53316EVM-075 printed
circuit board. The EVM has been designed using a 4-layer, 2-oz copper circuit board.
Figure 20. TPS53316EVM-075 Top Layer Assembly Drawing (top view)
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www.ti.com EVM Assembly Drawing and PCB Layout
Figure 21. TPS53316EVM-075 Bottom Assembly Drawing (bottom view)
Figure 22. TPS53316EVM-075 Top Copper (top view)
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EVM Assembly Drawing and PCB Layout www.ti.com
Figure 23. TPS53316EVM-075 Layer 2 (top view)
Figure 24. TPS53316EVM-075 Layer 3 (top view)
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