Texas Instruments TPS61059EVM-141 User manual

1 Introduction
User's GuideSLVU150 – January 2006
TPS61059EVM-141
This user’s guide describes the characteristics, operation, and use of theTPS6105xEVM-141 evaluation module (EVM). This EVM demonstrates the TexasInstruments TPS6105x synchronous boost converter with down mode used to powerhigh-current, white-light LEDs for photo flash applications. This user’s guide includessetup instructions, a schematic diagram, a bill of materials (BOM), and PCB layoutdrawings for the evaluation module.
Contents1 Introduction .......................................................................................... 12 Setup ................................................................................................. 23 Board Layout ...................................................................................... 104 Schematic and Bill of Materials ................................................................. 125 Related Documentation From Texas Instruments ............................................ 14
List of Figures
1 Timing From LED Off to 700-mA Flash .......................................................... 42 Timing From 200-mA Movie Light to 700-mA Flash ........................................... 53 Timing From LED Off to 700-mA Flash .......................................................... 64 Timing Between Flashes .......................................................................... 75 Timing Between Flashes Using Pushbutton .................................................... 86 LED Flash Interrupted With FLASH OFF Input ................................................. 97 Efficiency ............................................................................................. 98 Assembly Layer ................................................................................... 109 Top Layer Routing ................................................................................ 1110 Bottom Layer Routing ............................................................................ 1211 TPS6105xEVM-141 Schematic ................................................................. 13
List of Tables
1 J3 Pin Functions .................................................................................... 22 HPA141A Bill of Materials........................................................................ 14
The Texas Instruments TPS6105xEVM-141 evaluation module (EVM) helps designers evaluate theoperation and performance of the TPS61058 or TPS61059 high-current boost converters for white-lightphoto flash applications. The TPS6105x has an externally programmed LED current so that the LED canbe used as a flash for still photography and as a torch, or movie light, for digital movies.
The EVM has one white-flash LED, the TPS6105x converter, and a timing circuit used to make the EVM astand-alone flash module.
If desired, other LEDs or LED current settings can be tested on the EVM by changing the feedbackresistors on the EVM. See the TPS6105x data sheet for information on calculating new resistor values.
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2 Setup
2.1 Input / Output Connector Descriptions
Setup
This section describes the jumpers and connectors on the EVM as well as how to properly connect, setup, and use the TPS6105xEVM-141.
2.1.1 J1 –VIN
This is the positive input voltage connection to the converter. The EVM can be powered from any voltagebetween 2.7 V and 5.5 V. The leads to the input supply should be twisted and kept as short as possible tominimize EMI transmission and input voltage droop.
2.1.2 J2 –GND
This is the input return connection for the input power supply.
2.1.3 J3 –External Measurement or Control Connector
This connector is used to monitor the flash and enable inputs of the TPS6105x. An external controller canalso be connected to this connector to operate the EVM flash function. R11 and R12 should be removedand left open if an external controller is used to control the EVM. The pin functions of J3 when using anexternal controller are shown in Table 1 .
Pin 1 – EN: Output of timing circuit. Drives EN pin of the TPS6105x.
Pin 2 – FLASH: Output of timing circuit. Drives FLASH signal of TPS6105x. A low on this pin produces ahigh-current flash.
Pin 3 – FLASH OFF: Input to timing circuit. A high on this pin immediately forces the TPS6105x to stop ahigh-current flash. This pin can be used to interrupt or mask off a high-current flash. The state of this pindoes not effect the timing of the timing circuit.
Pin 4 – GND
Table 1. J3 Pin Functions
EN
(1)
FLASH OFF
(1)
FLASH
(1)
FUNCTION
L X X OFFH L H MOVIE LIGHTH L L FLASHH H H MOVIE LIGHTH H L MOVIE LIGHT
(1)
X = don't care; L = 0 V; H = 1.8 V
2.1.4 JP1 –Torch Enable
JP1 is used to enable torch mode. Placing a shorting bar across pins 1 and 2 of JP1 turns the torch modeon. In torch mode, the LED is constantly illuminated with an LED current of approximately 200 mA. If theFLASH button is pushed, the LED flashes at the flash current limit of 700 mA and then returns to torchmode after the flash time. If JP1 is left open, the LED is off. If the FLASH button is pushed with JP1 open,then the LED flashes and returns to the off state after the flash time.
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2.2 Setup
tsec C(nF)
175 0.0005
(1)
Duty Cycle C15(nF) 0.0875
C15(nF) C9(nF) 0.175
(2)
AvgPower R7I2flash R7DI2noflashR7(1 D)
(3)
AvgPowerLED IflashVFLEDDInoflashVFLED(1 D)
(4)
Setup
2.2.1 EVM Factory Configuration
The EVM is configured to provide the following nominal operating conditions:•Movie light current: 200 mA•Flash current: 700 mA•Precharge current: 42 mA•Length of flash: 320 ms•Time between flashes: 3.2 s
2.2.2 Changing Flash Timing
The length of flash and time between flashes can be changed by changing capacitors C15 and C9.Capacitor C15 sets the length of the flash, and capacitor C9 sets the time between flashes. The time ofeach period can be calculated, in seconds, using Equation 1 where C(nF) is the value of thecorresponding timing capacitor in nanoFarads.
For example, the EVM has a 0.056- µF capacitor installed for C15 which determines the length of the flash.Using Equation 1 , a 0.056- µF capacitor provides a 320-ms flash.
Care must be taken when changing the timing so that the maximum power rating of the LED (D1) orsense resistor (R7) are not exceeded. The average power of these components can be calculated usingthe duty cycle of the flash circuit. The flash duty cycle is the time the LED is in flash mode divided by thesum of the flash mode and time between flashes. The duty cycle can be calculated using Equation 2 withthe value of the timing capacitors C15 and C9.
The average power dissipated in the sense resistor R7 is calculated using Equation 3 . In Equation 3 , I
flashis the flash current level, and I
noflash
is the current when not flashing which is zero or the torch currentvalue depending on the setting of JP1.
The average power dissipated in the LED is calculated using Equation 4 . In Equation 4 , V
FLED
is theforward voltage of the LED, I
flash
is the flash current level, and I
noflash
is the current when not flashing whichis zero or the torch current value depending on the setting of JP1.
2.2.3 Using External Control
The EVM has provisions to disable the onboard timing circuit and use an external controller. An externalcontroller can be connected to connector J3 to drive the enable and flash inputs of the TPS6105x.Resistors R11 and R12 should be removed and left open on the EVM to avoid signal contention betweenthe onboard timing circuit and the external controller.
2.2.4 Operation
1. Configure JP1 to enable or disable torch mode as desired.2. Connect the input voltage return to J2.3. Connect the positive input voltage to J1.4. Turn on input voltage. If JP1 is shorted, then the LED turns on in torch mode. If JP1 is open, the LEDremains off.5. Push the FLASH button to flash the LED.6. The LED flashes for approximately 320 ms.7. If JP1 is shorted, then the LED returns to torch mode. If JP1 is open, the LED turns off.
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EN
/FLASH
LED Current
Setup
The EVM board has a built-in timing circuit to generate the necessary signals for torch and flash modes.The timing circuit sets the length of the flash. After a flash, the timing circuit disables the flash function forapproximately 3.2 s. Pressing the flash button during this 3-s period has no effect. This keeps the averagepower dissipation of the LED below the maximum power limitation of the LED.
The FLASH OFF input on J3 can be used to force the LED flash off during a flash sequence. This isintended to turn the flash off in camera phones while the power amplifier is transmitting. A logic 1 on pin 3of J3 extinguishes the flash as long as the input is high. This does not reset the timing of the timing circuit.
2.2.5 Test Results
NOTE: CH1 = Enable Signal – pin 1 of J3; CH2 = Flash Signal – Pin 2 of J3; CH4 = LED Current
Figure 1. Timing From LED Off to 700-mA Flash
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EN
/FLASH
LED Current
Setup
NOTE: CH1 = Enable Signal – pin 1 of J3; CH2 = Flash Signal – Pin 2 of J3; CH4 = LED Current
Figure 2. Timing From 200-mA Movie Light to 700-mA Flash
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EN
/FLASH
LED Current
Setup
NOTE: CH1 = Enable Signal – pin 1 of J3; CH2 = Flash Signal – Pin 2 of J3; CH4 = LED Current
Figure 3. Timing From LED Off to 700-mA Flash
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EN
/FLASH
LED Current
Setup
NOTE: CH1 = Enable Signal – pin 1 of J3; CH2 = Flash Signal – Pin 2 of J3; CH4 = LED Current
Figure 4. Timing Between Flashes
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EN
/FLASH
“Flash”Pushbutton,
High = pushed
“Flash”Pushbutton is ignored for
approximately 3.2 seconds from
end of last flash
Setup
NOTE: CH1 = Enable Signal – pin 1 of J3; CH2 = Flash Signal – pin 2 of J3; CH3 = Pushbutton Signal pin A1 ofU4
Figure 5. Timing Between Flashes Using Pushbutton
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/FLASH pin 2
of J3
FLASH OFF
pin 3 of J3
LED Current
VI−Input Voltage −V
0
10
20
30
40
50
60
70
80
90
100
2.5 3.0 3.5 4.0 4.5 5.0 5.5
LED Power Efficiency (PLED/PIN)−%
ILED= 700 mA @ VF= 4.1 V
Setup
NOTE: CH1 = FLASH– pin 2 of J3; CH2 = FLASH OFF – Pin 3 of J3; LED Current
Figure 6. LED Flash Interrupted With FLASH OFF Input
Figure 7. Efficiency
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3 Board Layout
3.1 Layout
Board Layout
This section provides the TPS6105xEVM-141 board layout and illustrations.
Figure 8 ,Figure 9 , and Figure 10 show the board layout for the TPS6105xEVM-141 printed-circuit board.
Figure 8. Assembly Layer
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Board Layout
Figure 9. Top Layer Routing
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4 Schematic and Bill of Materials
Schematic and Bill of Materials
Figure 10. Bottom Layer Routing
This section provides the TPS6105xEVM-141 schematic and bill of materials.
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4.1 Schematic
Schematic and Bill of Materials
Figure 11. TPS6105xEVM-141 Schematic
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4.2 Bill of Materials
5 Related Documentation From Texas Instruments
Related Documentation From Texas Instruments
Table 2. HPA141A Bill of MaterialsCOUNT Ref Des Value Description Size Part Number MFR
4 C1, C2, C3, C11 22 µF Capacitor, Ceramic, 6.3V, X5R, 20% 0805 C2012X5R0J226MTJ TDK
1 C10 0.1 µF Capacitor, Ceramic, 25V, X5R, 10% 0402 C1005X5R1E104K TDK
1 C15 0.056 µF Capacitor, Ceramic, 16V, X7R, 10% 0603 GRM188R71C563KC01 Murata
1 C18 0.33 µF Capacitor, Ceramic, 10V, X5R, 10% 0603 C1608X5R1A334KB TDK
1 C4 1000 pF Capacitor, Ceramic, 25V, C0G, 5% 0402 C1005C0G1E102K TDK
1 C5 22 µF Capacitor, Ceramic, 10V, X5R, 10% 1206 C3216X5R1A226K TDK
1 C6 1.0 µF Capacitor, Ceramic, 25V, X5R, 10% 0603 C1608X5R1E105K TDK
1 C7 0.1 µF Capacitor, Ceramic, 50V, X7R, 15% 0603 C1608X7R1H104K TDK
6 C8, C12, C13, 0.01 µF Capacitor, Ceramic, 25V, C0G, 5% 0603 C1608C0G1E103K TDKC14, C16, C17
1 C9 0.56 µF Capacitor, Ceramic, 10V, X5R, 10% 0603 C0603C564K8PACTU Kemet
1 D1 Diode, Flash, 1amp, Vfwd 3.9V 0.065 ×0.080 LXCL-PWF1 Lumileds
Lighting
0 D2 Open Diode, LED 1210
0 D3 Open Diode, Flash, 1amp, Vfwd 3.9V 0.065 ×0.080
2 J1, J2 Header, 2 pin, 100mil spacing, (36-pin strip) 0.100 ×2 PTC36SAAN Sullins
1 J3 Header, 4 pin, 100mil spacing, (36-pin strip) 0.100 ×4 PTC36SAAN Sullins
1 JP1 Header, 2 pin, 100mil spacing, (36-pin strip) 0.100 ×2 PTC36SAAN Sullins
1 L1 4.7 µH Inductor, SMT, 1.1A, 120 m Ω0.177 ×0.185 VLF5014AT-4R7M1R1 TDK
1 R1 22.1k Resistor, Chip, 1/16W, 1% 0402 Std Std
2 R11, R12 0 Resistor, Chip, 1/16W, 1% 0603 Std Std
1 R13 10k Resistor, Chip, 1/16W, 1% 0603 Std Std
0 R17 Open Resistor, Chip, 1/10W, 1% 0805
0 R18 Open Resistor, Chip, 1/16W, 1% 0402
1 R2 68.1k Resistor, Chip, 1/16W, 1% 0402 Std Std
1 R3 100k Resistor, Chip, 1/16W, 1% 0402 Std Std
1 R4 3.65k Resistor, Chip, 1/16W, 1% 0402 Std Std
1 R5 6.81k Resistor, Chip, 1/16W, 1% 0402 Std Std
1 R6 7.5k Resistor, Chip, 1/16W, 1% 0402 Std Std
1 R7 1.2 Resistor, Chip, 1/10W, 1% 0805 Std Std
7 R8, R9, R10, 100k Resistor, Chip, 1/16W, 1% 0603 Std StdR14, R15, R16,R19
1 S1 Switch, SPST, PB Momentary, Sealed Washable 0.245 ×0.251 KT11P2JM C & K
1 U1 IC, Synchronous Boost Converter With Down SON-10 TPS61059DRC TIMode High Power White LED Driver
1 U2 IC, Regulator, LDO, Micropower, 1.1 µA at 10mA. SOP-5 (DCK) TPS79718DCK TIVin 0.30–5.5V
1 U3 IC, Dual 2-Input Positive-OR Gates WCSP-8 SN74LVC2G32YEPR TI
1 U4 IC, Single D-Type Flip-Flop With Asynchronous WCSP-6 SN74LVC1G175YZPR TIClear
2 U5, U6 IC, Low Quiescent Current, Programmable 1.5V, SOT23-6 TPS3808G15DBVR TIDelay Time: 1.25ms to 10s
1 U7 IC, Dual Schmitt-Trigger Inverter WCSP-6 SN74LVC2G14YZPR TI
1 — PCB, 2 In x 1.9 In x 0.062 In HPA141 Any
1 — Shunt, 100-mil, Black 0.100 929950-00 3M
TPS61058/9 data sheet (SLVS572 )
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Related Documentation From Texas Instruments
FCC Warnings
This equipment is intended for use in a laboratory test environment only. It generates, uses, and can radiate radio frequencyenergy and has not been tested for compliance with the limits of computing devices pursuant to subpart J of part 15 of FCC rules,which are designed to provide reasonable protection against radio frequency interference. Operation of this equipment in otherenvironments may cause interference with radio communications, in which case the user at his own expense will be required totake whatever measures may be required to correct this interference.
EVM TERMS AND CONDITIONS
Texas Instruments (TI) provides the enclosed Evaluation Module and related material (EVM) to you, the user, (you or user)SUBJECT TO the terms and conditions set forth below. By accepting and using the EVM, you are indicating that you have read,understand and agree to be bound by these terms and conditions. IF YOU DO NOT AGREE TO BE BOUND BY THESE TERMSAND CONDITIONS, YOU MUST RETURN THE EVM AND NOT USE IT.This EVM is provided to you by TI and is intended for your INTERNAL ENGINEERING DEVELOPMENT OR EVALUATIONPURPOSES ONLY. It is provided “AS IS” and “WITH ALL FAULTS.” It is not considered by TI to be fit for commercial use. Assuch, the EVM may be incomplete in terms of required design-, marketing-, and/or manufacturing-related protective considerations,including product safety measures typically found in the end product. As a prototype, the EVM does not fall within the scope of theEuropean Union directive on electromagnetic compatibility and therefore may not meet the technical requirements of the directive.Should this EVM not meet the specifications indicated in the EVM User’s Guide, it may be returned within 30 days from the date ofdelivery for a full refund of any amount paid by user for the EVM, which user agrees shall be user’s sole and exclusive remedy.THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY TI TO USER, AND IS IN LIEU OF ALL OTHERWARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY, FITNESSFOR ANY PARTICULAR PURPOSE OR NON-INFRINGEMENT.TI shall have no obligation to defend any claim arising from the EVM, including but not limited to claims that the EVM infringes thirdparty intellectual property. Further, TI shall have no liability to user for any costs, losses or damages resulting from any suchclaims. User shall indemnify and hold TI harmless against any damages, liabilities or costs resulting from any claim, suit orproceeding arising from user’s handling or use of the EVM, including but not limited to, (i) claims that the EVM infringes a thirdparty’s intellectual property, and (ii) claims arising from the user’s use or handling of the EVM. TI shall have no responsibility todefend any such claim, suit or proceeding.User assumes all responsibility and liability for proper and safe handling and use of the EVM and the evaluation of the EVM. TIshall have no liability for any costs, losses or damages resulting from the use or handling of the EVM. User acknowledges that theEVM may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction of the EVM it is theuser’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge.EXCEPT TO THE EXTENT OF THE USER’S INDEMNITY OBLIGATIONS SET FORTH ABOVE, NEITHER PARTY SHALL BELIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES WHETHER TI ISNOTIFIED OF THE POSSIBILITY OR NOT.TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not exclusive.TI assumes no liability for applications assistance, customer product design, software performance, or infringement ofpatents or services described herein.
User agrees to read the EVM User’s Guide and, specifically, the EVM warnings and Restrictions notice in the EVM User’s Guideprior to handling the EVM and the product. This notice contains important safety information about temperatures and voltages.It is user’s responsibility to ensure that persons handling the EVM and the product have electronics training and observe goodlaboratory practice standards.By providing user with this EVM, product and services, TI is NOT granting user any license in any patent or other intellectualproperty right.
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 2.7 V to 5.5 V and the outputvoltage range of 2.5 V to 5.5 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.
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Related Documentation From Texas Instruments
EVM WARNINGS AND RESTRICTIONS (continued)
During normal operation, some circuit components may have case temperatures greater than55 °C. The EVM is designed to operate properly with certain components above 60 °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.
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265Copyright © 2006, Texas Instruments Incorporated
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