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TPS53127EVM-614
User Manual
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Texas Instruments TPS53127EVM-614 User Manual

User's Guide
SLVU434–February 2011
TPS53127EVM-614
The TPS53127EVM-614 Dual Output BUCK presents an easy to use reference design for a common dual output power supply using the TPS53127 controller in cost sensitive applications.
Contents
1 Introduction .................................................................................................................. 2
1.1 Description .......................................................................................................... 2
1.2 Application .......................................................................................................... 2
1.3 Features ............................................................................................................. 2
2 Electrical Performance Specifications .................................................................................... 3
4.1 Enable Switches (SW1 and SW2) ............................................................................... 5
4.2 Switching Frequency Select Switch (SW3) ..................................................................... 5
4.3 Test Point Descriptions ............................................................................................ 5
5 Test Setup ................................................................................................................... 6
5.1 Equipment ........................................................................................................... 6
5.2 Equipment Setup ................................................................................................... 7
5.3 Start Up/Shut Down Procedure .................................................................................. 9
5.4 Output Ripple Voltage Measurement Procedure .............................................................. 9
5.5 Equipment Shutdown .............................................................................................. 9
6 TPS53127EVM-614 Test Data ............................................................................................ 9
6.1 Efficiency .......................................................................................................... 10
6.2 Line and Load Regulation ....................................................................................... 11
6.3 Output Voltage Ripple and Switching Node waveforms ..................................................... 12
6.4 Switch Node ....................................................................................................... 13
7 TPS53127EVM-614 EVM Assembly Drawings and Layout .......................................................... 14
8 Bill of Materials ............................................................................................................. 17
3 TPS53127EVM-614 Recommended Test Setup ....................................................................... 8
4 Efficiency vs Load (VIN= 8 V–22 V, V 5 Efficiency vs Load (VIN= 8 V–22 V, V 6 Output Voltage vs Load (VIN= 8 V–22 V, V 7 Output Voltage vs Load (VIN= 8 V–22 V, V 8 Output Voltage Ripple (VIN= 12 V, V 9 Output Voltage Ripple (VIN= 12 V, V 10 Switching Waveform (VIN= 12 V, V 11 Switching Waveform (VIN= 12 V, V
12 Top Assembly.............................................................................................................. 14
13 Bottom Assembly.......................................................................................................... 14
14 Top Layer................................................................................................................... 15
15 Bottom Layer............................................................................................................... 15
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List of Figures
= 1.05 V, I
OUT1
= 1.8 V, I
OUT2
= 1.05 V, I
OUT1
= 1.05 V, I
OUT2
= 1.05 V, I
OUT1
= 1.8 V, I
OUT2
= 1.05 V, I
OUT1
= 1.8 V, I
OUT2
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OUT2
- 0 A–4A)................................................. 10
OUT1
- 0 A–4A) .................................................. 10
OUT2
= 0 A–4 A)......................................... 11
OUT1
= 0 A–4 A)......................................... 11
OUT2
= 4 A)...................................................... 12
OUT1
= 4 A) ....................................................... 12
OUT2
= 4 A) ....................................................... 13
OUT1
= 4 A)......................................................... 13
1
Introduction
16 Internal Layer 1............................................................................................................ 16
17 Internal Layer 2............................................................................................................ 16
3 TPS53127EVM-614 Bill of Materials.................................................................................... 17
1 Introduction
1.1 Description
The TPS53127EVM-614 Dual Output BUCK evaluation board provides the user with a convenient way to evaluate the TPS53127 Dual D-CAP2 mode control BUCK controller in a realistic cost sensitive application. Providing both a low “core-type” 1.05V and “I/O type” 1.8V output at up to 4A from a loosely regulated 12V (8V-22V) source, the TPS53127EVM-614 includes switches and test-points to assist a user in evaluating the performance of the TPS53127 controller in their application.
1.2 Application
• Digital television
• Set-top box
• DSL and cable modems
• Cost-sensitive digital consumer products
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List of Tables
1.3 Features
• 8-V to 22-V input
• 1.05-V and 1.8-V output
• Up to 4 A per channel output
• 700-kHz pseudo-fixed frequency D-CAP2 mode control
• Independent enable switches for power-on/power-off testing
2
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2 Electrical Performance Specifications
Table 1. TPS53127EVM-614 Electrical and Performance Specifications
Parameter Notes and Conditions MIN TYP MAX UNIT
INPUT CHARACTERISTICS
V
IN
I
IN
V
IN_UVLO
OUTPUT CHARACTERISTICS
V
OUT1
V
OUT1_rip
I
OUT1
V
OUT2
V
OUT2_rip
I
OUT2
SYSTEMS CHARACTERISTICS
F
SW
ηpk Peak Efficiency VIN= 12 V – 85% – η Full Load Efficiency VIN= 12 V, I
Input Voltage 8 12 22 V Input Current VIN= 12 V, I No Load Input Current VIN= 12 V, I Input UVLO I
= 4 A 4.0 4.2 4.5 V
OUT
Output Voltage 1 VIN= 12 V, I Line Regulation VIN= 8 V to 22 V – – 1% Load Regulation I
= 0 A to 4 A – – 1%
OUT1
Output Voltage Ripple VIN= 12 V, I Output Current 1 VIN= 8 V to 22 V 0 4 A Output Voltage 2 VIN= 12 V, I Line Regulation VIN= 8 V to 22 V – – 1% Load Regulation I
= 0 A to 4 A – – 1%
OUT2
Output Voltage Ripple VIN= 12 V, I Output Current 2 VIN= 8 V to 22 V 0 4 A
Switching Frequency 350 700 800 kHz
Electrical Performance Specifications
= 4 A, I
OUT1
= 0 A – 20 35 mA
OUT
= 2 A 1.03 1.05 1.07 V
OUT1
= 4 A – - 30 mVpp
OUT2
= 2 A 1.78 1.80 1.82 V
OUT2
= 4 A – – 30 mVpp
OUT2
= 4 A – 83% –
OUT1
= 4 A – 1.2 1.5 A
OUT2
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TPS53127EVM-614 Schematic
3 TPS53127EVM-614 Schematic
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NOTE: For Reference Only, See Table 3 for Specific Values.
Figure 1. TPS53127EVM-614 Schematic
4
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4 Connector and Test Point Descriptions
4.1 Enable Switches (SW1 and SW2)
TPS53127EVM-614 includes independent enable switches for each of the two outputs. When the switch is in the DIS position, the channel is disabled and discharged per the TPS53127’s internal discharge characteristics.
To Enable VOUT1, place SW1 in the EN position To Enable VOUT2, place SW2 in the EN position
4.2 Switching Frequency Select Switch (SW3)
TPS53127EVM-614 does not populate SW3. When using TPS53127EVM-614 to evaluate the TPS53126 controller in the TSSOP package, SW3 can be populated to allow selection of the TPS53126 switching frequency between 350 kHz and 700 kHz.
4.3 Test Point Descriptions
Table 2 lists the test points, their labels, uses, and where additional information is located.
Table 2. TPS53127EVM-614 Test Points Description
Test Point Label Use Section
TP1 TEST1 Monitor Channel 1 Soft-Start Voltage Section 4.3.4 TP2 TEST2 Monitor Channel 2 Soft-Start Voltage Section 4.3.4 TP3 GND Ground for Input Voltage Section 4.3.1 TP4 GND Ground for Channel 1 Output Voltage Section 4.3.2 TP5 SW1 Monitor Switching Node for Channel 1 Section 4.3.5 TP6 GND Ground for Channel 2 Output Voltage Section 4.3.3 TP7 VO2 Monitor Output Voltage for Channel 2 Section 4.3.3 TP8 VO1 Monitor Output Voltage for Channel 1 Section 4.3.2
TP9 VIN Monitor Input Voltage Section 4.3.1 TP10 VREG5 Monitor Output of VREG5 Regulator Section 4.3.6 TP11 SW2 Monitor Switching Node for Channel 2 Section 4.3.5
CN1 VOUT1 Monitor Output Voltage for Channel 1 Section 4.3.2
CN2 VOUT2 Monitor Output Voltage for Channel 2 Section 4.3.3
Connector and Test Point Descriptions
4.3.1 Input Voltage Monitoring (TP3 and TP9)
TPS53127EVM-614 provides two test points for measuring the voltage applied to the module. This allows the user to measure the actual module voltage without losses from input cables and connectors. All input voltage measurements should be made between TP9 and TP3. To use TP9 and TP3, connect a voltmeter positive terminal to TP9 and negative terminal to TP3.
4.3.2 Channel 1 Output Voltage Monitoring (TP4 and TP8)
TPS53127EVM-614 provides two test points for measuring the voltage generated at the VO1 Output by the module. This allows the user to measure the actual output voltage without losses from output cables and connectors. All DC Output voltage measurements should be made between TP8 and TP4. To use TP8 and TP4, connect a voltmeter positive terminal to TP8 and negative terminal to TP4.
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TP4TP8
Metal Ground Barrel
Probe Tip
Test Setup
Figure 2. Tip and Barrel Measurement for Output Voltage Ripple
4.3.3 Channel 2 Output Voltage Monitoring (TP6 and TP7)
TPS53127EVM-614 provides two test points for measuring the voltage generated at the VO1 Output by the module. This allows the user to measure the actual output voltage without losses from output cables and connectors. All DC Output voltage measurements should be made between TP7 and TP6. To use TP7 and TP6, connect a voltmeter positive terminal to TP7 and negative terminal to TP6.
4.3.4 Soft-Start Voltage Monitoring (TP1, TP2 and TP3)
TPS53127EVM-614 provides two test points for measuring the soft-start ramp voltages. TP1 monitors the soft-start ramp of Channel 1. TP2 monitors the soft-start ramp of Channel 2. To use TP1 or TP2, connect an oscilloscope probe between TP1 or TP2 and TP3.
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4.3.5 Switching Node Monitoring (TP3, TP5 and TP11)
TPS53127EVM-614 provides two test points for measuring the switching node waveform voltages. TP5 monitors the switching node of Channel 1. TP2 monitors the switching node of Channel 2. To use TP5 or TP11, connect an oscilloscope probe between TP5 or TP11 and TP3.
4.3.6 5-V Regulator Output Monitoring (TP3 and TP10)
TPS53127EVM-614 provides a test point for measuring the output of the internal 5V regulator. TP10 monitors the output voltage of the internal 5V regulator. To use TP10, connect a voltmeter positive terminal to TP10 and negative terminal to TP3.
5 Test Setup
5.1 Equipment
5.1.1 Voltage Source
V The input voltage source (V minimum
5.1.2 Meters
A1: 0-4Adc, Ammeter V1: VIN, 0-22V voltmeter V2: VOUT1, 0-2V voltmeter V3: VOUT2, 0-2V voltmeter
IN
) shall be a 0-25V variable DC source capable of supplying 3.0 Adc
VIN
6
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