Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsDev KitsPCB design board

User's Guide

SLVU273 – September 2008

Using the TPS55386EVM-363 A 12V Input, 5.0V & 3.3V

Output, 3A Non-Synchronous Buck Converter

Contents

1 Introduction ................................................................................................................... 2

1.1 Description ........................................................................................................... 2

1.2 Applications .......................................................................................................... 2

1.3 Features .............................................................................................................. 2

2 TPS55386EVM-363 Electrical Performance Specifications ............................................................ 3

3 Schematic ..................................................................................................................... 4

3.1 Sequencing Jumper (JP3) ......................................................................................... 5

3.2 Enable Jumpers (JP1 and JP2) ................................................................................... 5

3.3 Error Amplifier Outputs ............................................................................................. 5

3.4 Test Point Descriptions ............................................................................................ 5

4 Test Set UP ................................................................................................................... 7

4.1 Equipment ........................................................................................................... 7

4.2 Equipment Setup.................................................................................................... 8

4.3 Start Up / Shut Down Procedure ................................................................................ 10

4.4 Output Ripple Voltage Measurement Procedure .............................................................. 10

4.5 Control Loop Gain and Phase Measurement Procedure .................................................... 11

4.6 Equipment Shutdown ............................................................................................. 11

5 TPS55386EVM-363 Typical Performance Data and Characteristic Curves ........................................ 11

5.1 Efficiency ........................................................................................................... 12

5.2 Line and Load Regulation ........................................................................................ 12

5.3 Switch Node and Output Ripple Voltage ....................................................................... 13

5.4 Output Ripple Voltage ............................................................................................ 13

5.5 CONTROL LOOP BODE PLOT ................................................................................. 14

6 EVM Assembly Drawings and Layout ................................................................................... 15

7 List of Materials ............................................................................................................. 18

List of Figures

1 TPS55386EVM-363 Schematic (For Reference Only, See Table 4: Bill of Materials for Specific Values) ..... 4

2 TPS55386EVM-363 Recommended Test Set-Up ....................................................................... 9

3 Output Ripple Measurement – Tip and Barrel using TP3 and TP4 or TP18 and TP19 ............................ 9

4 Control Loop Measurement Setup ....................................................................................... 10

5 TPS55386EVM-363 Efficiency vs Load Current ....................................................................... 12

6 TPS55386EVM-363 Output Voltage vs Load Current ................................................................. 12

7 TPS55386EVM-363 Output Voltage Ripple ............................................................................ 13

8 Output Ripple Voltage Measured at Test Points ....................................................................... 13

9 Output Ripple Voltage Measured at Test Points ...................................................................... 14

10 TPS55386EVM-363 Gain and Phase vs Frequency .................................................................. 14

11 TPS55386EVM-363 Component Placement (Viewed from Top) .................................................... 15

12 TPS55386EVM-363 Silkscreen (Viewed from Top) ................................................................... 15

13 TPS55386EVM-363 Top Copper (Viewed from Top) .................................................................. 16

14 TPS55386EVM-363 Bottom Copper (X-Ray View from Top) ........................................................ 16

15 TPS55386EVM-363 Internal 1 (X-Ray View from Top) ............................................................... 17

16 TPS55386EVM-363 Internal 2 (X-Ray View from Top) ............................................................... 17

SLVU273 – September 2008 Using the TPS55386EVM-363 A 12V Input, 5.0V & 3.3V Output, 3A Non-Synchronous Buck Converter 1

Submit Documentation Feedback

Summary of content (19 pages)

PAGE 1
User's Guide SLVU273 – September 2008 Using the TPS55386EVM-363 A 12V Input, 5.0V & 3.3V Output, 3A Non-Synchronous Buck Converter 1 2 3 4 5 6 7 Contents Introduction ................................................................................................................... 2 1.1 Description ........................................................................................................... 2 1.2 Applications .............................................................................
PAGE 2
Introduction www.ti.com List of Tables 1 2 3 1 TPS55386EVM-363 Electrical and Performance Specifications....................................................... 3 Test Point Descriptions ..................................................................................................... 5 TPS55386EVM-363 Bill of Materials.....................................................................................
PAGE 3
TPS55386EVM-363 Electrical Performance Specifications www.ti.com 2 TPS55386EVM-363 Electrical Performance Specifications Table 1. TPS55386EVM-363 Electrical and Performance Specifications Parameter Notes and Conditions Min Nom Max Units 9.6 12 13.2 V – 2.4 2.6 A INPUT CHARACTERSTICS VIN Input Voltage IIN Input Current VIN = Nom, IOUT = Max No Load Input Current VIN = Nom, IOUT = 0 A Input UVLO IOUT = Min to Max VIN_UVLO – 12 20 mA 4.0 4.2 4.
PAGE 4
Schematic 3 www.ti.com Schematic Figure 1. TPS55386EVM-363 Schematic (For Reference Only, See Table 4: Bill of Materials for Specific Values) 4 Using the TPS55386EVM-363 A 12V Input, 5.0V & 3.
PAGE 5
Schematic www.ti.com 3.1 Sequencing Jumper (JP3) The TPS55386EVM-363 provides a 3 pin 100-mil header and shunt for programming the TPS55386’s sequencing function. Placing the JP3 shunt in the Left Position connects the sequence pin to BP and sets the TPS55386 controller to sequence Channel 2 prior to Channel 1 when Enable 2 is activated.
PAGE 6
Schematic 3.4.1 www.ti.com Input Voltage Monitoring (TP1 and TP2) TPS55386EVM-363 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 TP1 and TP2. To use TP1 and TP2, connect a voltmeter positive terminal to TP1 and negative terminal to TP2. 3.4.
PAGE 7
Test Set UP www.ti.com 3.4.8 Output Voltage Monitoring (TP18 and TP19) TPS55386EVM-363 provides two test points for measuring the voltage generated by the module. This allows the user to measure the actual module output voltage without losses from output cables and connector losses. All output voltage measurements should be made between TP18 and TP19. To use TP18 and TP19, connect a voltmeter positive terminal to TP18 and negative terminal to TP19.
PAGE 8
Test Set UP www.ti.com The power connection between J2 of HPA241 and LOAD1 can carry as much as 2Adc. The minimum recommended wire size is AWG #18, with the total length of wire less than 2 feet (1 foot output, 1 foot return). J3 to LOAD2 The power connection between J3 of HPA241 and LOAD2 can carry as much as 2Adc. The minimum recommended wire size is AWG #18, with the total length of wire less than 2 feet (1 foot output, 1 foot return). 4.1.
PAGE 9
Test Set UP www.ti.com 4.2.2 Diagram FAN Oscilloscope 1MΩ, AC 20mV / div 20MHz See Tip and Barrel Measurement for Vout ripple + LOAD2 3.3V @ 2A + V3 _ _ + + A1 VIN _ _ V1 _ LOAD1 5.0V @ 2A + _ V2 + Figure 2. TPS55386EVM-363 Recommended Test Set-Up Metal Ground Barrel Probe Tip TP3 / TP4 / TP18 TP19 Tip and Barrel Vout ripple measurement Figure 3.
PAGE 10
Test Set UP www.ti.com Network Analyzer FAN Oscilloscope 1MΩ, AC 20mV / div 20MHz See Tip and Barrel Measurement for Vout ripple Isolation Transformer + _ _ _ V3 + + A1 VIN _ V1 + + LOAD2 3.3V @ _ 2A _ LOAD1 5.0V @ 2A + V2 + Figure 4. Control Loop Measurement Setup 4.3 Start Up / Shut Down Procedure 1. 2. 3. 4. 5. 6. 7. 4.4 Increase VIN from 0V to 12Vdc Vary LOAD1 from 0 – 3Adc Vary LOAD2 from 0 – 3Adc Vary VIN from 9.6Vdc to 13.
PAGE 11
www.ti.com 5. 6. 7. 8. 9. 4.5 TPS55386EVM-363 Typical Performance Data and Characteristic Curves Connect Oscilloscope Probe to TP3 and TP4 or TP18 and TP19 as shown in Figure 3 Measure Output Ripple Decrease VIN to 0Vdc Decrease LOAD1 to 0A Decrease LOAD2 to 0A Control Loop Gain and Phase Measurement Procedure 1. 2. 3. 4. 5. 6.
PAGE 12
TPS55386EVM-363 Typical Performance Data and Characteristic Curves 5.1 www.ti.com Efficiency 5 V Efficiency 3.3 V Efficiency 100 100 η - Efficiency - % η - Efficiency - % 95 9.6 V 95 90 12 V 13.2 V 85 9.6 V 90 85 12 V 80 80 75 75 70 0.15 0.65 1.15 1.65 2.15 ILOAD - Load Current - A 70 0.15 2.65 0.65 13.2 V 1.15 1.65 2.15 ILOAD - Load Current - A 2.65 VIN = 9.6-13.2V, VOUT1 = 5.0V IOUT1 = 0-3A, VOUT2 = 3.3V IOUT2 = 0-3A Figure 5. TPS55386EVM-363 Efficiency vs Load Current 5.
PAGE 13
TPS55386EVM-363 Typical Performance Data and Characteristic Curves www.ti.com 5.3 Switch Node and Output Ripple Voltage VIN = 13.2V, = 5.0V IOUT1 = 3A, VOUT2 = 3.3V IOUT2 = 3A Ch1: TP3 (VOUT1), Ch2: TP18 (VOUT2) Ch3: TP9 (SW1), Ch4: TP12 (SW2) Figure 7. TPS55386EVM-363 Output Voltage Ripple 5.
PAGE 14
TPS55386EVM-363 Typical Performance Data and Characteristic Curves www.ti.com CH1: VOUT1 CH2: VOUT2 Figure 9. Output Ripple Voltage Measured at Test Points 5.5 CONTROL LOOP BODE PLOT 100 225 100 225 3.3 V 5V 80 180 135 60 135 40 90 40 20 45 Gain - dB 60 Phase Gain 0 0 Gain - dB 180 80 Phase 90 45 20 Gain 0 0 -20 -45 -20 -45 -40 -90 -40 -90 -60 0 1 10 100 f - Frequency - kHz -135 1000 -135 -60 0 1 10 100 F - Frequency - kHz 1000 VIN = 12V, VOUT1 = 5.
PAGE 15
EVM Assembly Drawings and Layout www.ti.com 6 EVM Assembly Drawings and Layout Figure 11 through Figure 16 show the designs of the TPS55386EVM-363 printed circuit board. The EVM has been designed using a 4-Layer, 2oz copper-clad circuit board 3.0” × 3.0” with all components in a 1.15” × 2.15” active area on the top side and all active traces to the top and bottom layers to allow the user to easily view, probe and evaluate the TPS55386 control IC in a practical double-sided application.
PAGE 16
EVM Assembly Drawings and Layout www.ti.com Figure 13. TPS55386EVM-363 Top Copper (Viewed from Top) Figure 14. TPS55386EVM-363 Bottom Copper (X-Ray View from Top) 16 Using the TPS55386EVM-363 A 12V Input, 5.0V & 3.
PAGE 17
www.ti.com EVM Assembly Drawings and Layout Figure 15. TPS55386EVM-363 Internal 1 (X-Ray View from Top) Figure 16. TPS55386EVM-363 Internal 2 (X-Ray View from Top) SLVU273 – September 2008 Using the TPS55386EVM-363 A 12V Input, 5.0V & 3.
PAGE 18
List of Materials 7 www.ti.com List of Materials Table 3 lists the EVM components as configured according to the schematic shown in Figure 1. Table 3. TPS55386EVM-363 Bill of Materials QTY 18 RefDes Value Description Size Part Number MFR 1 C1 100 µF Capacitor, Aluminum, 25V, 20% 0.328 x 0.390 inch EEEFC1E101P Panasonic 1 C12 4.7 µF Capacitor, Ceramic, 10V, X5R, 20% 0805 Std Std 2 C2, C14 22 µF Capacitor, Ceramic, 6.
PAGE 19
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.