Texas Instruments PS62510EVM-168 User manual

1 Introduction
2 Setup
User's GuideSLVU161 – May 2006
TPS62510EVM-168
This User’s Guide describes the characteristics, operation, and use of theTPS62510EVM-168 Evaluation Module (EVM). The Texas Instruments TPS62510 is ahigh efficiency step-down converter for operation from a 1.8V to 3.8V input voltage railcapable of supplying up 1.5A. This User’s Guide includes setup instructions, aschematic diagram, a bill of materials (BOM), and PCB layout drawings for theevaluation module for the TPS62510.
Contents1 Introduction .......................................................................................... 12 Setup ................................................................................................. 13 Board Layout ........................................................................................ 64 Schematic and Bill of Materials ................................................................... 85 Related Documentation From Texas Instruments .............................................. 8
List of Figures
1 HPA168 Efficiency .................................................................................. 32 HPA168 Load Regulation.......................................................................... 43 Output Voltage ...................................................................................... 44 Output Voltage ...................................................................................... 55 Output Ripple Voltage .............................................................................. 56 Output Ripple Voltage .............................................................................. 67 Assembly Layer ..................................................................................... 68 Top Layer Routing .................................................................................. 79 Bottom Layer Routing .............................................................................. 710 TPS62510EVM-168 Schematic ................................................................... 8
List of Tables
1 TPS62510EVM-168 Bill of Materials ............................................................. 8
The Texas Instruments TPS62510EVM-168 evaluation module (EVM) helps designers evaluate theoperation and performance of the TPS62510 switching step-down converter. This high efficiency converteris targeted for portable devices where space is critical and is ideally suited for two cell NiMHd or Alkalineapplications.
The TPS62510 EVM maximizes output power and efficiency while supplying 1.8V at 1.5A. It is designed tooperate with an input voltage between 1.8V–3.8V and has the option to adjust the output voltage bymodifying the resistive feedback divider. Refer to the TPS62510 data sheet (SLVS651) for moreinformation.
This chapter describes the jumpers and connectors on the EVM as well as how to properly connect, setup,and use the TPS62510-168.
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2.1 Input / Output Connector Descriptions
2.1.1 J1 –VIN
2.1.2 J2 – GND
2.1.3 J3 –VOUT
2.1.4 J4 – GND
2.1.5 J5 –PG
2.1.6 JP1 – MODE/SYNC
2.1.7 JP2 – EN
2.1.8 JP3 – OVT
Setup
This is the positive input connection to the DC/DC converter. The leads to the input supply should betwisted and kept as short as possible to minimize EMI transmission.
This is the input return connection for the input power supply.
This is the positive connection from the output of the DC/DC converter. Connect this pin to the positiveinput of the load.
The default factory output voltage is set at 1.8V. By adjusting the feedback resistors, the output voltagecan be adjusted between 0.6V -- 3.8V. Refer to the data sheet (SLVS651) for further details.
This is the return connection from the output of the DC/DC converter. Connect this pin to the negativeinput of the load.
This header is tied to the Power Good (PG) pin of the IC and is used to indicate when the output voltagereaches a certain threshold. The PG pin is an open-drain output and must be tied to an external voltage(< 4V) through a resistor for proper operation. This pin should be left floating if unused. For the EVM, PGis tied to VOUT through a resistor.
This jumper toggles the operating mode of the IC between PFM/PWM mode and Forced PWM mode.Connect the shorting jumper to GND for PFM/PWM operation; connect the shorting jumper to VIN forForced PWM operation. Also, by removing the jumper the MODE/SYNC pin can also be connected to anexternal clock if it is desired to sync this EVM to a specific frequency. See the data sheet (SLVS651) forfurther details. This pin should never be left floating.
This jumper enables or disables the linear regulator. Connect the shorting jumper from the center EN pinto VIN to turn the converter ON; connect EN to GND to turn the converter OFF. This pin should never beleft floating.
This jumper provides access to the Over Voltage Tracking (OVT) functionality of this IC. By modifyingresistors R3 and R4 appropriately, this feature can be demonstrated by removing the shorting jumper andconnecting an external voltage source directly to OVT. See the data sheet (SLVS651) for additional detailson how to do this. The default setting for the EVM does not demonstrate this feature and appropriately tiesOVT to VIN through the shorting jumper in normal operation. This pin should never be left floating.
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2.2 Operation
2.3 Test Results
0 0.25 0.50 0.75 1 1.25 1.50 1.75
I - Output Current - A
O
Efficiency - %
PFM/PWM
Forced PWM
80
82
84
86
88
90
92
94
96
HPA168 Efficiency
V = 3.3 V
I
Setup
The absolute maximum input voltage for the TPS62510 is 4.0V, and it is imperative that this voltage is notexceeded to ensure the IC is not damaged. The EVM is designed to operate with an input voltagebetween 1.8V–3.8V and an output voltage adjusted between 0.6V–VIN. JP1 determines the mode for thepart and the shorting jumper must be tied either to VIN for Forced PWM mode operation or to GND forPFM/PWM mode operation. JP2 is the enable for the switching converter, and the shorting jumper mustbe tied to VIN to enable the part or GND to disable the part. The EVM is not initially configured for OVToperation, so the shorting jumper must connect OVT to VIN for proper operation.
The test results for this EVM at T
A
= 25°C are shown in Figure 1 and Figure 2 .
Figure 1. HPA168 Efficiency
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HPA168 Load Regulation
1.791
1.793
1.795
1.797
1.799
1.801
1.803
1.805
1.807
0 0.25 0.5 0.75 1 1.25 1.5 1.75
I - Output Current - A
O
PFM/PWM
V - Output Voltage - V
O
V = 3.3 V
I
Forced PWM
Setup
Figure 2. HPA168 Load Regulation
Figure 3 shows the 1.8V output voltage when the load current is pulsed between 1500mA and 150mA. Vin= 3.3Vdc, SYNC = Vin. (Blue = Output Voltage = 50mV/DIV, Green = Output Current = 500mA/DIV,5µs/DIV)
Figure 3. Output Voltage
Figure 4 shows the 1.8V output voltage when the load current is pulsed between 150mA and 1500mA. Vin= 3.3Vdc, SYNC = Vin. (Blue = Output Voltage = 50mV/DIV, Green = Output Current = 500mA/DIV,5µs/DIV)
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Setup
Figure 4. Output Voltage
The 1.8V output ripple voltage in PFM mode is shown in Figure 5 . The image was taken with the outputloaded to 120mA and the input voltage set to 3.3Vdc. (Yellow = Switchnode = 2V/DIV, Red = OutputRipple Voltage = 10mV/DIV, Green = Inductor Current = 500mA/DIV, 2us/DIV)
Figure 5. Output Ripple Voltage
The 1.8V output ripple voltage is shown in Figure 6 . The image was taken with the output loaded to1500mA and the input voltage set to 3.3Vdc. (Yellow = Switchnode = 2V/DIV, Blue = Output RippleVoltage = 10mV/DIV, Green = Inductor Current = 200mA/DIV, 200ns/DIV)
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3 Board Layout
3.1 Layout
Board Layout
Figure 6. Output Ripple Voltage
This chapter provides the TPS62510-168 board layout and illustrations.
Figure 7 ,Figure 8 , and Figure 9 show the board layout for the TPS63510-168 PWB.
Figure 7. Assembly Layer
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Board Layout
Figure 8. Top Layer Routing
Figure 9. Bottom Layer Routing
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4 Schematic and Bill of Materials
4.1 Schematic
4.2 Bill of Materials
5 Related Documentation From Texas Instruments
5.1 If You Need Assistance
Schematic and Bill of Materials
This chapter provides the TPS62510EVM-168 schematic and bill of materials.
Figure 10. TPS62510EVM-168 Schematic
Table 1. TPS62510EVM-168 Bill of Materials
COUNT Ref Des Value Description Size Part Number MFR
2 C1, C2 22 µF Capacitor, Ceramic, 6.3V, X5R, 15% 1206 C3216X5R0J226K TDK1 C3 15pF Capacitor, Ceramic, 50V, C0G, 5% 0603 C1608C0G1H150JB TDK1 C4 0.1 µF Capacitor, Ceramic, 25V, X5R, 10% 0603 C1608X5R1E104KB TDK5 J1–J5 Header, 2-pin, 100mil spacing (36-pin strip) 0.100 × 2 PTC36SAAN Sullins3 JP1–JP3 Header, 3-pin, 100mil spacing (36-pin strip) 0.100 × 3 PTC36SAAN Sullins1 L1 2.2 µH Inductor, SMT, 2.3A, 70m Ω0.26 × 0.09 DO1608-222MLC Coilcraft1 R1 402k ΩResistor, Chip, 1/16W, 1% 0603 Std Std1 R2 200k ΩResistor, Chip, 1/16W, 1% 0603 Std Std1 R3 0 ΩResistor, Chip, 1/16W, 1% 0603 Std Std0 R4 Open Resistor, Chip, 1/16W, 1% 06031 R5 1 ΩResistor, Chip, 1/16W, 1% 0603 Std Std1 R6 1.00M Resistor, Chip, 1/16W, 1% 0603 Std Std1 U1 IC, 1.5A Low Vin high efficiency step-down QFN10 TPS62510DRC TIconverter1 – PCB, 1.7 In x 1.2 In x 0.062 In HPA168 Any3 – Shunt, 100 mil, Black 0.1 929950-00 3M
TPS62510 data sheet (SLVS651)
Contact your local TI sales representative.
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Related Documentation From Texas Instruments
EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT,DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be afinished end-product fit for general consumer use. Persons handling the product(s) must haveelectronics training and observe good engineering practice standards. As such, the goods beingprovided are not intended to be complete in terms of required design-, marketing-, and/ormanufacturing-related protective considerations, including product safety and environmentalmeasures typically found in end products that incorporate such semiconductor components orcircuit boards. This evaluation board/kit does not fall within the scope of the European Uniondirectives regarding electromagnetic compatibility, restricted substances (RoHS), recycling(WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of thesedirectives or other related directives.Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, theboard/kit may be returned within 30 days from the date of delivery for a full refund. THEFOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYERAND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY,INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULARPURPOSE.
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FCC Warning
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT,DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be afinished end-product fit for general consumer use. It generates, uses, and can radiate radiofrequency energy and has not been tested for compliance with the limits of computing devicespursuant to part 15 of FCC rules, which are designed to provide reasonable protection againstradio frequency interference. Operation of this equipment in other environments may causeinterference with radio communications, in which case the user at his own expense will berequired to take whatever measures may be required to correct this interference.
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Related Documentation From Texas Instruments
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 1.8 V to 3.8 V and the outputvoltage range of 0.6 V to 3.8 V.Exceeding the specified input range may cause unexpected operation and/or irreversible damageto the EVM. If there are questions concerning the input range, please contact a TI fieldrepresentative prior to connecting the input power.Applying loads outside of the specified output range may result in unintended operation and/orpossible permanent damage to the EVM. Please consult the EVM User's Guide prior toconnecting any load to the EVM output. If there is uncertainty as to the load specification, pleasecontact a TI field representative.During normal operation, some circuit components may have case temperatures greater than50 °C. The EVM is designed to operate properly with certain components above 50 °C as long asthe input and output ranges are maintained. These components include but are not limited tolinear regulators, switching transistors, pass transistors, and current sense resistors. These typesof devices can be identified using the EVM schematic located in the EVM User's Guide. Whenplacing measurement probes near these devices during operation, please be aware that thesedevices may be very warm to the touch.
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