Texas Instruments TPS560200 User manual

User's Guide
SLVU954–September 2013
TPS560200EVM-537 0.5-A, Single Channel Regulator
Evaluation Module
This user's guide contains information for the TPS560200 as well as support documentation for the
TPS560200EVM-537 evaluation module. Included are the performance specifications, schematic, and the
bill of materials of the TPS560200EVM-537.
Contents
1 Introduction .................................................................................................................. 2
2 Performance Specification Summary ..................................................................................... 2
3 Modifications ................................................................................................................. 3
3.1 Output Voltage Setpoint ........................................................................................... 3
4 Test Setup and Results .................................................................................................... 4
4.1 Input/Output Connections ......................................................................................... 4
4.2 Start-Up Procedure ................................................................................................ 4
4.3 Efficiency ............................................................................................................ 5
4.4 Load Regulation .................................................................................................... 6
4.5 Line Regulation ..................................................................................................... 6
4.6 Load Transient Response ........................................................................................ 7
4.7 Output Voltage Ripple ............................................................................................. 8
4.8 Input Voltage Ripple ............................................................................................... 9
4.9 Start-Up ............................................................................................................ 10
4.10 Shut-Down ......................................................................................................... 11
5 Board Layout ............................................................................................................... 12
5.1 Layout .............................................................................................................. 12
6 Schematic, Bill of Materials, and Reference ........................................................................... 15
6.1 Schematic ......................................................................................................... 15
6.2 Bill of Materials .................................................................................................... 16
6.3 Reference .......................................................................................................... 16
List of Figures
1 TPS560200EVM-537 Efficiency........................................................................................... 5
2 TPS560200EVM-537 Light Load Efficiency ............................................................................. 5
3 TPS560200EVM-537 Load Regulation .................................................................................. 6
4 TPS560200EVM-537 Line Regulation ................................................................................... 6
5 TPS560200EVM-537 Load Transient Response, 25% to 75% Load Step.......................................... 7
6 TPS560200EVM-537 Load Transient Response, No Load to 50% Load Step..................................... 7
7 TPS560200EVM-537 Output Voltage Ripple, IOUT = 0.5 A............................................................. 8
8 TPS560200EVM-537 Output Voltage Ripple, IOUT = 30 mA ........................................................... 8
9 TPS560200EVM-537 Output Voltage Ripple, IOUT = 0 A............................................................... 9
10 TPS560200EVM-537 Input Voltage Ripple, IOUT = 0.5 A............................................................... 9
11 TPS560200EVM-537 Start-Up Relative to VIN ......................................................................... 10
12 TPS560200EVM-537 Start-Up Relative to EN ........................................................................ 10
13 TPS560200EVM-537 Shut-Down Relative to VIN...................................................................... 11
14 TPS560200EVM-537 Shut-Down Relative to EN ..................................................................... 11
D-CAP2, SWIFT, Eco-mode are trademarks of Texas Instruments.
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Introduction www.ti.com
15 Top Assembly.............................................................................................................. 12
16 Top Layer................................................................................................................... 13
17 Bottom Layer............................................................................................................... 14
18 TPS560200EVM-537Schematic Diagram.............................................................................. 15
List of Tables
1 Input Voltage and Output Current Summary ............................................................................ 2
2 TPS560200EVM-537Performance Specifications Summary.......................................................... 2
3 Output Voltages............................................................................................................. 3
4 Connection and Test Points ............................................................................................... 4
5 Bill of Materials............................................................................................................. 16
1 Introduction
The TPS560200 is a single, adaptive on-time, D-CAP2™-mode, synchronous buck converter requiring a
very low external component count. The D-CAP2 control circuit is optimized for low-ESR output capacitors
such as POSCAP, SP-CAP, or ceramic types and features fast transient response with no external
compensation. The switching frequency is internally set at a nominal 600 kHz. The high-side and low-side
switching MOSFETs are incorporated inside the TPS560200 package along with the gate-drive circuitry.
The low drain-to-source on resistance of the MOSFETs allows the TPS560200 to achieve high efficiencies
and helps keep the junction temperature low at high output currents. The TPS560200 dc/dc synchronous
converter is designed to provide up to a 0.5-A output from an input voltage source of 4.5 V to 17 V. The
output voltage range is from 0.8 V to 5.5 V. Rated input voltage and output current ranges for the
evaluation module are given in Table 1.
The TPS560200EVM-537 evaluation module (EVM) is a single, synchronous buck converter providing
1.05 V at 0.5 A from 4.5-V to 17-V input. This user’s guide describes the TPS560200EVM-537
performance.
Table 1. Input Voltage and Output Current Summary
EVM Input Voltage Range Output Current Range
TPS560200EVM-537 VIN = 4.5 V to 17 V 0 A to 0.5 A
2 Performance Specification Summary
A summary of the TPS560200EVM-537 performance specifications is provided in Table 2. Specifications
are given for an input voltage of VIN = 12 V and an output voltage of 1.05 V, unless otherwise noted. The
ambient temperature is 25°C for all measurement, unless otherwise noted.
Table 2. TPS560200EVM-537Performance Specifications Summary
Specifications Test Conditions Min Typ Max Unit
Input voltage range (VIN) 4.5 12 17 V
Output voltage 1.05 V
Operating frequency VIN = 12 V, IO= 0.5 A 600 kHz
CH1 Output current range 0 0.5 A
Over current limit VIN = 12 V, LO= 10 µH 0.55 A
Output ripple voltage VIN = 12 V, IO= 0.5 A 10 mVPP
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OUT
R1 0.8 V
R2 =
V -0.8V
´
www.ti.com Modifications
3 Modifications
These evaluation modules are designed to provide access to the features of the TPS560200. Some
modifications can be made to this module.
3.1 Output Voltage Setpoint
To change the output voltage of the EVMs, it is necessary to change the value of resistor R1. Changing
the value of R1 can change the output voltage above 0.765 V. The value of R1 for a specific output
voltage can be calculated using Equation 1.
(1)
Table 3 lists the R1 values for some common output voltages. For higher output voltages of 1.8 V or
above, a feedforward capacitor (C3) may be required to improve phase margin. Pads for this component
(C3) are provided on the printed-circuit board. Note that the values given in Table 3 are standard values
and not the exact value calculated using Table 3.
Table 3. Output Voltages
L1
Output Voltage R1 R2 C3 C4 + C5
(µH)
(V) (kΩ) (kΩ) (pF) (µF)
Min Typ Max
1.0 6.19 20.0 10 10 + 10
1.05 6.19 20.0 10 10 + 10
1.2 10.0 20.0 10 10 + 10
1.5 17.4 20.0 10 10 + 10
1.8 24.9 20.0 optional 10 10 + 10
2.5 42.2 20.0 optional 10 10 + 10
3.3 61.9 20.0 optional 10 10 + 10
5.0 105 20.0 optional 10 10 + 10
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Test Setup and Results www.ti.com
4 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS560200EVM-537. The section
also includes test results typical for the evaluation modules and efficiency, output load regulation, output
line regulation, load transient response, output voltage ripple, input voltage ripple, start-up, and switching
frequency.
4.1 Input/Output Connections
The TPS560200EVM-537 is provided with input/output connectors and test points as shown in Table 4. A
power supply capable of supplying 2 A must be connected to J1 through a pair of 20-AWG wires. The load
must be connected to J2 through a pair of 20-AWG wires. The maximum load current capability is 1 A.
Wire lengths must be minimized to reduce losses in the wires. Test point TP1 provides a place to monitor
the VIN input voltages with TP2 providing a convenient ground reference. TP7 is used to monitor the output
voltage with TP8 as the ground reference.
Table 4. Connection and Test Points
Reference Designator Function
J1-1 VIN positive sense and monitor point
J1-2 VIN (see Table 1 for VIN range)
J2-1 Ground return for VIN
J2-2 VIN negative sense and monitor point
J3-1 VOUT positive sense and monitor point
J3-2 VOUT, 1.05 V at 0.5-A maximum
J4-1 Ground return for VOUT
J4-2 VOUT negative sense and monitor point
JP1 EN control. Shunt EN to GND to disable, open EN to enable.
TP1 Switch node test point
TP2 Test point for loop response measurements
4.2 Start-Up Procedure
1. Ensure that the jumper at JP1 (Enable control) is covered to shunt EN to GND, disabling the output.
2. Apply appropriate VIN voltage to VI (J1-2) and GND (J2-1).
3. Remove the jumper at JP1 (Enable control) to uncover EN and GND, enabling the output.
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0
10
20
30
40
50
60
70
80
90
100
0.001 0.01 0.1 1
Efficiency - %
Output Current - A
C002
VIN = 5 V
VIN = 12 V
0
10
20
30
40
50
60
70
80
90
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50
Efficiency - %
Output Current - A
C001
VIN = 5 V
VIN = 12 V
www.ti.com Test Setup and Results
4.3 Efficiency
Figure 1 shows the efficiency for the TPS560200EVM-537 at an ambient temperature of 25°C.
Figure 1. TPS560200EVM-537 Efficiency
Figure 2 shows the efficiency at light loads for the TPS560200EVM-537 at an ambient temperature of
25°C.
Figure 2. TPS560200EVM-537 Light Load Efficiency
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-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
4 6 8 10 12 14 16 18
Line Rgulation - %
Input Voltage - V
C004
IOUT = 0.25 A
±1.50
±1.00
±0.50
0.00
0.50
1.00
1.50
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50
Load Regulation - %
Output Current - A
C003
VIN = 5 V
VIN = 12 V
Test Setup and Results www.ti.com
4.4 Load Regulation
The load regulation for the TPS560200EVM-537 is shown in Figure 3.
Figure 3. TPS560200EVM-537 Load Regulation
4.5 Line Regulation
The line regulation for the TPS560200EVM-537 is shown in Figure 4.
Figure 4. TPS560200EVM-537 Line Regulation
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V = 50 mV / div (ac coupled)
OUT
Time = 200 µsec / div
I = 200 mA / div
OUT
Load step = 10 mA - 250 mA, slew rate = 500 mA / µsec
V = 50 mV / div (ac coupled)
OUT
Time = 200 µsec / div
I = 200 mA / div
OUT
Load step = 125 mA - 375 mA, slew rate = 500 mA / µsec
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4.6 Load Transient Response
The TPS560200EVM-537 response to load transient is shown in Figure 5 and Figure 6. The current steps
and slew rates are indicated in the figures. Total peak-to-peak voltage variation is as shown.
Figure 5. TPS560200EVM-537 Load Transient Response, 25% to 75% Load Step
Figure 6. TPS560200EVM-537 Load Transient Response, No Load to 50% Load Step
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V = 20 mV / div (ac coupled)
OUT
Time = 5 µsec / div
SW = 5 V / div
V = 20 mV / div (ac coupled)
OUT
Time = 1 µsec / div
SW = 5 V / div
Test Setup and Results www.ti.com
4.7 Output Voltage Ripple
The TPS560200EVM-537 output voltage ripple is shown in Figure 7,Figure 8, and Figure 9. The output
currents are as indicated.
Figure 7. TPS560200EVM-537 Output Voltage Ripple, IOUT = 0.5 A
Figure 8. TPS560200EVM-537 Output Voltage Ripple, IOUT = 30 mA
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V = 20 mV / div (ac coupled)
IN
Time = 1 µsec / div
SW = 5 V / div
V = 20 mV / div (ac coupled)
OUT
Time = 2 msec / div
SW = 5 V / div
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Figure 9. TPS560200EVM-537 Output Voltage Ripple, IOUT =0A
4.8 Input Voltage Ripple
The TPS560200EVM-537 input voltage ripple is shown in Figure 10. The output current is as indicated.
Figure 10. TPS560200EVM-537 Input Voltage Ripple, IOUT = 0.5 A
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V = 500 mV / div
OUT
Time = 2 msec / div
EN = 5 V / div
V = 5 V / div
IN
V = 500 mV / div
OUT
Time = 2 msec / div
EN = 5 V / div
V = 5 V / div
IN
Test Setup and Results www.ti.com
4.9 Start-Up
The TPS560200EVM-537 start-up waveform relative to VIN is shown in Figure 11.Load=4Ωresistive.
Figure 11. TPS560200EVM-537 Start-Up Relative to VIN
The TPS560200EVM-537 start-up waveform relative to enable (EN) is shown in Figure 12.Load=4Ω
resistive.
Figure 12. TPS560200EVM-537 Start-Up Relative to EN
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