Texas Instruments TPS61310EVM-638 User manual

User's Guide
SLVU419–April 2011
TPS61310EVM-638 Evaluation Module User Guide
This user’s guide describes the characteristics, functions, and use of the TPS61310EVM-638 Evaluation
Module (EVM). This EVM demonstrates the Texas Instruments TPS61310 LED camera flash and video
light driver with I2C interface. This document includes setup instructions, a schematic diagram, a bill of
materials and PCB layout drawings for the EVM.
1 INTRODUCTION
The TPS61310 is an integrated system with a broad feature set for driving up to three LEDs for
still-camera flash and video-camera lighting applications. The power stage is capable of supplying a
maximum total current of up to 1600mA (2x400mA for LED1 and LED3, 800mA for LED2).
The device operates as an single, dual or triple channel LED driver generating the required LED forward
voltages. The internal step-up converter boosts the input voltage adjusted to the required LED forward
voltage and controls the LED current with the integrated current sinks.
The internal step-up converter can be used for further applications as well, such as supplying an audio
amplifier.
All functions and feature sets can be either addressed by dedicated hardware pins or with the I2C
interface.
1.1 Requirements
To operate this EVM, connect and properly configure the following components:
•Personal Computer:
–OS: Windows™2000 or Windows™XP
–USB port
–Minimum of 30MB of free hard disk space (100 MB recommended)
–Minimum of 256MB of RAM
•Printed Circuit Board Assembly:
–The board containing the TPS61310 in CSP-20 package.
–External components
–High power WLEDs
•USB-To-GPIO Adapter:
–This USB interface adapter is used to evaluate the I2C controlled device via a personal computer
using the USB interface. It receives the USB command, converts the signal into an I2C protocol and
sends the I2C signal to the TPS61310EVM board. The USB-To-GPIO can be supplied at the
following URL: ti.com
•Software:
–Texas Instruments provides software to assist in evaluating this EVM. The software can either be
installed from the supplied CD or download from the TI Web site
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HARDWARE SETUP www.ti.com
2 HARDWARE SETUP
This section describes the jumpers and connectors of the EVM and how to properly connect, set up and
use the TPS61310EVM-638.
2.1 EVM Hardware Setup
Table 1. Board Input/Output Connector Descriptions
Jumper/Connecter Function
J1 is for the IC positive input supply voltage and ground. The leads to the input supply should be
J1 –VIN/GND twisted and kept as short as possible to minimize EMI transmission and reduce inductive voltage
droop during a load-transient event. VIN should be between 2.5V and 5.5V.
J2 is connected to the device output and GND pins. In flash or movie mode, VOUT is connected to
the LED anodes and can be used to access the high-side LED voltage. In voltage regulation
J2 –VOUT/GND mode, the header can be used to measure the regulated output voltage and connect an external
load.
These headers support external LEDs. The LED1 and LED2 headers link the LED cathodes to the
J3 –device current sinks. The LED anodes are connected to the VOUT output. The TS header is
VOUT/LED1/LED2/TS/GND provided for the NTC resistor (220kΩ) connection.
J4 is connected to the device I2C SCL and SDA. The serial clock and data line can be used to
J4 –SCL/SDA/GND monitor the traffic between the PC and the EVM or set up I2C communication.
J5 –I2C Input for the J5 provides a link to the USB-To-GPIO 10-pin ribbon cable interface. The included software uses
USB-To-GPIO the adapter to communicate with the EVM via the I2C protocol.
J6 –I2C Input for the MSP430 J6 is a 14-pin JTAG interface. It links the device to the MSP430 USB debug interface. The
USB-Debug-Interface MSP430 embedded software uses the adapter to communicate with the EVM via the I2C protocol.
This jumper is used to connect the SCL and SDA to two 2.2kΩpull-up resistors. These resistors
JP1 –I2C Pull-Up are either linked to the board input voltage or to ground. In normal use, the I2C pull-up resistor
should be connected to Vin. This configuration is due to the I2C open-drain architecture.
JP2 is employed if the LED temperature is not monitored. In this case, the TS input should be tied
JP2 –TS to Vin.
The nReset jumper is directly linked to the device hardware reset input. If this pin is LOW, the
JP3 –nReset device is forced to shutdown mode, and the I2C control and all internal control registers are reset.
Otherwise, if nReset = HIGH, the device operates normally.
JP4 is connected to the RF PA synchronization control input of the TPS61310. Tying this input
JP4 –Tx-Mask HIGH switches the LED current from flash to video-light operation. In video-light mode, the peak
current drained from the battery is significantly reduced.
JP5 selects the LED current to a high or low level. If the low current level is selected, the flash
JP5 –STRB1 mode is enabled. In the other configuration, the video light mode is selected.
JP6 –STRB0 JP6 sets STRB0 to Vin or to GND. If STRB0 is HIGH, all the LED current regulators are activated.
The middle pin of JP7 is connected to GPIO/PG on the TPS61310. The jumper is used to set
JP7 –GPIO/PG/XINT GPIO to a high or a low level.
JP8 allows connecting the GPIO/PG pull-up resistor to Vin. It is used to avoid setting a high level
JP8 –Pull-up Resistor when the GPIO pin is not used.
JP9, 10 and 11 –Output These jumpers facilitate LED current measurements.
current evaluation
Table 2. Default Jumper Settings
JUMPER DEFAULT
JP1 High
JP2 Unconnected
JP3 High
JP4 Low
JP5 Low
JP6 High
JP7 Unconnected
JP8 Unconnected
JP9 Connected
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www.ti.com EVM SOFTWARE SETUP AND OPERATION
Table 2. Default Jumper Settings (continued)
JUMPER DEFAULT
JP10 Connected
JP11 Connected
2.2 I2C Interface Setup
2.2.1 External Connections
Once the jumpers are set, connect the USB-To-GPIO adapter to the PC as shown in the drawing below.
Figure 1. USB Interface Adapter Connection
Connect a positive input voltage between 2.5V and 5.5V with a minimum current capability of 1.3A.
WARNING
This EVM has white LEDs that flash with a very intense light. Eye
protection and/or a diffuser to cover the LEDs during operation are
recommended.
2.3 Software Setup
Either installed from the CD or downloaded from TI website, run Setup.exe and follow all the prompts to
install the software. After installation, the software should automatically run.
3 EVM SOFTWARE SETUP AND OPERATION
3.1 General considerations
The EVM software running on a PC host, communicates with the device and provides access to its
internal registers. First, the host checks if the USB-To-GPIO firmware version is up to date. If it is not,
please download and update to the latest version. Note that after updating the firmware, the USB must be
disconnected and reconnected. The same process applies to the EVM software.
3.2 Software Description
For ease of use, two user interfaces have been implemented: a simple one and a detailed one. The Setup
menu permits switching from one to the other. In both interfaces, special care is taken to warn the user in
case of hardware power or connection problems via indicators at the bottom of the window.
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3.2.1 Simple Interface
The simple interface shown below appears by default when running the software.
Figure 2. Simple Interface
Before starting any action, the current limit must be set after powering up the device. Once this is done,
the user can choose two types of light applications. The movie type illustrates a typical DC
continuous-light application such as video lighting. The still type shows a typical camera-flash application.
In both cases, the various LED parameters are easily modified by using the sliders. The battery droop is
also selectable among several values.
To run and stop the chosen configuration, a START and a STOP button are provided.
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3.2.2 Detailed Interface
The second interface puts forward all the TPS61310 features through the modeling of internal registers.
Figure 3 illustrates the detailed interface of the evaluation software.
Figure 3. Detailed Interface
The toolbar allows control of parameters which are only accessible through the software. In addition to
normal register Read and Write, the software has an Auto-read and a Write-On-Change function. The I2C
activity box shows the action (Read or Write), the register address and data, and the number of transfers
between the host and the device. The Watchdog Reset list-box is a DC light dedicated function which is
aimed at refreshing the video mode of the IC.
This interface performs no calculations or computations; it simply reads and writes to and from the IC
registers through the I2C interface.
As explained before, prior to use any features of the device, the ILIM bit must be set. Each register bits
can be changed manually by clicking on the buttons corresponding to each bit in the panel, or can be
changed through the drop-down boxes, check-boxes and buttons. Read-only bits are listed in the
group-box Status/Flags.
The Reset and Read button writes REGISTER0[0]=1 and reads all the registers. Values shown in the
table may differ from those presented in the datasheet as some bits assume two different functions in read
and write operations.
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t - Time = 1 ms/div
I
(500mA/div)
LED2
V = 3.6V, V = 4.95V, I = 1750mA
IN OUT LIM
LED2 Channel Only
DCLC2[2:0] = 000
FC2[5:0] = 100000
STRB0
(2V/div)
LED2 Pin Headroom Voltage
(1V/div)
V
(1V/div - 3.6V Offset)
OUT
0
10
20
30
40
50
60
70
80
90
100
LED Power Efficiency (PLED/PIN) - %
2.5 2.9 3.3 3.7 4.1 4.5 4.9 5.3
V - Input Voltage - V
I
ILED1 = 50 mA
ILED2 = 100 mA
ILED3 =
I = 1750 mA,
Tx-MASK = Low
LIM
ILED1 = 0 mA
ILED2 = 200 mA
ILED3 = 10
ILED1 = 5 mA
ILED2 = 150 mA
ILED3 = 7
ILED1 = 50 mA
ILED2 = 550 mA
ILED3 = 2
ILED1 = 50 mA
ILED2 = 600 mA
ILED3 = 3
ILED1 = 50 mA
ILED2 = 450 mA
ILED3 = 2
t - Time = 200 µs/div
MODE_CTRL[1:0] = 01
DC Light Turn-On
I
(50mA/div)
LED2
I
(200mA/div)
L
V = 3.6V, V = 4.95V
I = 1750mA
IN OUT
LIM
LED2 Channel Only
DCLC2[2:0] = 100
V
(2V/div)
OUT
2.5 2.9 3.3 3.7 4.1 4.5 4.9 5.3
V - Input Voltage - V
I
0
10
20
30
40
50
60
70
80
90
100
LED Power Efficiency (PLED/PIN) - %
ILED2 = 75 mA
ILED2 = 100 mA
ILED2 = 150 mA
ILED2 = 225 mA
I = 1750 mA,
Tx-MASK = Low
LED2 Channel
LIM
TEST RESULTS www.ti.com
4 TEST RESULTS
4.1 Flash mode
Figure 4. LED Power Efficiency Figure 5. Flash Sequence
vs
Input Voltage
4.2 Video Light mode
Figure 6. LED Power Efficiency vs Input Voltage Figure 7. Video Light Startup
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t - Time = 50 s/divm
I
(500mA/div)
L
V
(500mV/div - 4.95V Offset)
OUT
V = 3.6V,
IN V = 4.95V
I = 1750mA
OUT
LIM
PFM/PWM Operation
ENPSM bit = 1
I
(500mA/div)
OUT
50mA to 500mA Load Step
0
10
20
30
40
50
60
70
80
90
100
1 10 100 1000 10000
I - Output Current - mA
O
Efficiency - %
V = 4.2 V
IN
V = 3.6 V
IN
V = 2.5 V
IN
V = 4.95 V
Voltage Mode Regulation
OUT
I = 1750 mA
LIM
V = 3 V
IN
PFM/PWM Operation
Forced PWM Operation
www.ti.com BOARD LAYOUT
4.3 Voltage Mode
Figure 8. Efficiency vs Input Voltage Figure 9. Load Transient
5 BOARD LAYOUT
Proper board layout is important for all high-frequency switch-mode power supplies. Figure 10 through
Figure 14 show the board layout for the TPS61310EVM-638 PCB. The nodes with high switching
frequencies and currents are kept as short as possible to minimize trace inductance. Careful attention has
been given to the routing of high-frequency current loops. A single-point grounding scheme is used. Also,
the majority of the heat sinking for this device occurs through the top layer traces and vias pulled from the
IC’s solder bumps that carry high currents. For specific layout guidelines, see the TPS61310 data sheet.
Figure 10. Assembly Layer
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BOARD LAYOUT www.ti.com
Figure 11. Top Layer
Figure 12. Layer 2
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www.ti.com BOARD LAYOUT
Figure 13. Layer 3
Figure 14. Bottom Layer
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SCHEMATICS AND BILL OF MATERIALS www.ti.com
6 SCHEMATICS AND BILL OF MATERIALS
Figure 15. TPS61310EVM-638 Schematic
Table 3. TPS61310EVM-638 Bill of Materials
Qua. Ref Des Value Dl Size Part Number Mfr
C3225X7R1C2
2 C1, C2 22µF Capacitor, Ceramic, 16V, X5R 1210 TDK
26M
Capacitor, Ceramic, 10-µF, 6.3-V, C1608X5R0J1
2 C3, C4 10µF 0603 TDK
X5R, 10% 06MT
Ceramos LWW
2 D1, D2 CERAMOS Diode, Flash, 1amp, Vfwd 3.9V .065*.080 inch OSRAM
C9EP
Ceramos LWW
0 D3 Open Diode, Flash, 1amp, Vfwd 3.9V .065*.080 inch OSRAM
C9EP
1 D4 LS Q976 Diode, LED, [Color], 20mA 0603 LS Q976 Osram
3 J1, J3, J11 PEC04SAAN Header, 4-pin, 100mil spacing 0.100 x 4 PEC04SAAN Sullins
1 J12 PEC08SAAN Header, Male 8-pin, 100mil spacing 0.100 inch x 8 PEC08SAAN Sullins
J2, J5, J7, J8,
6 PEC03SAAN Header, Male 3-pin, 100mil spacing, 0.100 inch x 3 PEC03SAAN Sullins
J9, J10 N2510- Connector, Male Straight 2x10 pin, 0.338 x 0.788 N2510-
1 J4 3M
6002RB 100mil spacing, 4 Wall inch 6002RB
N2514- Connector, Male Straight 2x7 pin, 0.100 inch x N2514-
1 J6 3M
6002RB 100mil spacing, 4 Wall 2X7 6002RB
1 JP1 PEC03SAAN Header, 3-pin, 100mil spacing 0.100 x 3 PEC03SAAN Sullins
1 JP2 PEC02SAAN Header, 2-pin, 100mil spacing 0.100 inch x 2 PEC02SAAN Sullins
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