an1646

Application Note 1646
ISL97649A, ISL97649B Evaluation Board Manual
Description
Quick Setup Guide
The ISL97649AIREVALZ and ISL97649BIREVALZ are
evaluation boards for the ISL97649A and ISL97649B,
respectively. The ISL97649A, ISL97649B are DC/DC voltage
regulators for TFT-LCD displays, with screen sizes up to 20".
The devices integrate a boost converter, logic LDO (for
ISL97649A only), VON slice circuit, supply monitor circuit, and
a high performance VCOM amplifier with DCP (Digital
Controlled Potentiometer). Some key features and capabilities
of the ISL97649A, ISL97649B devices and evaluation boards
are:
Step 1: Connect the power supply between headers of VIN
and PGND. The positive output of the power supply
should be connected to VIN header. Set the power
supply voltage between 2.5V and 5.5V, and current
limit at 4A.
1. Deliver up to 450mA current for the TFT-LCD AVDD supply
used by various ICs including the source/column driver ICs.
2. Use an LDO to generate a low voltage needed by external
digital circuitry (ISL97649A only).
3. Generate VON (gate high) and VOFF (gate low) voltages used
by the TFT-LCD panel row/gate driver ICs.
4. Generate a modulated VGH_M output for the gate high
voltage, with desired delay time and discharge slope
controlled by the VON slice circuit.
Step 2: Connect the positive and negative inputs of the
electronic load to AVDD header and AVDD_GND,
respectively. The load current should not exceed the
maximum output current in Table 1.
Step 3: Connect JP5 to tie FREQ pin to VIN to set 1.2MHz
switching frequency. Disconnect JP5, FREQ is
internally pulled to ground to set 600kHz.
Step 4: Connect pin 2 of JP6 to pin 1 to tie EN pin to VIN
(default setting) or VLOGIC to enable the part. Connect
pin 2 of JP6 to pin 3 to pull EN pin to ground through
R21 to disable the IC.
Step 5: Connect pin 2 of JP7 to pin 1 to tie VIN pin of IC to
board VIN, or connect pin 2 of JP7 to pin 3 to tie VIN
pin of IC to LDO_VIN.
5. VCOM voltage calibration for setting the TFT-LCD pixel
common bias voltage. The DCP uses an I2C interface and
has EEPROM to store the final value. An integrated high
performance amplifier drives the calibrated TFT-LCD VCOM
voltage.
Step 6: Connect JP4 to connect LDO_VIN to VIN, or connect
headers of LDO_VIN to a separate power supply. Set
the power supply voltage between 2.5V and 5.5V.
6. Assert/de-assert a RESET signal at power-ON/OFF
Step 8: Connect an electronic load between headers of VON
and VIN_GND. The positive input of the electronic load
should be connected to VON header, the negative
input of the electronic load should be connected to
VIN_GND. Connect the electronic load between
headers of VOFF and VIN _GND. The positive input of
the electronic load should be connected to VIN_GND
header, the negative input of the electronic load
should be connected to VOFF. Set the load current
values in the electronic load. The values of VON and
VOFF at different loadings are shown in Table 2.
The ISL97649AIREVALZ and ISL97649BIREVALZ evaluation
board provide jumpers that allow users to select either 600kHz
or 1.2MHz switching frequency, and to enable or disable the IC.
Related Documents
ISL97649A, ISL97649B datasheet
Ordering Information
PART #
DESCRIPTION
ISL97649AIREVALZ
Evaluation Board for ISL97649A
ISL97649BIREVALZ
Evaluation Board for ISL97649B
Step 7:
Connect JP2 to use AVDD boost output as the external
charge pump input.
Step 9: Connect pin 2 of JP3 to pin 1 to connect VDIV to a
resistive divider between VIN and GND, or connect
pin 2 to pin 3 to connect VDIV to a resistive divider
between VLOGIC and GND.
Step 10: Connect JP1 to connect VON to VGH.
What is Needed
The following instruments will be needed to perform testing:
Step 12: Connect ISLUSBCEVAL1Z to the ISL97649 Evaluation
Board at U2 location. Then, connect USB cable
between Personal Computer’s USB port and
ISLUSBCEVAL1Z for USB to I2C communication.
• Power supplies
• DC Electronic load (E-Load)
• Multimeters
Step 13: Make sure all connections to the Evaluation Board are
correct, then turn on the power supply followed by the
electronic load. The part will power-ON and start
operating.
• Oscilloscope
• Resistors
• Cables and wires
April 4, 2013
AN1646.2
Step 11: Connect input from signal generator between headers
of VFLK and SGND. Select square waveform with an
amplitude of 3.3V and frequency of 50kHz.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2012, 2013. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Application Note 1646
AVDD Maximum Output Current
The internal MOSFET typical peak current limit is 1.5A (Note 1).
This limits the maximum AVDD continuous output current that
the ISL97649A/B Boost Converter can deliver to the load.
Maximum AVDD continuous output current in an actual
application may vary depending on component variations.
Feedback compensation parameters, input and output
capacitance of the boost converter may need to be modified in
order to achieve the stability with maximum peak inductor
current of 1.5A. Table 1 shows the maximum AVDD continuous
output current IOMAX at different VIN and AVDD voltages.
TABLE 1. TYPICAL MAXIMUM OUTPUT CURRENT
AVDD (V)
IOMAX (mA) (Note 1)
3.3
8
450
3.3
12
310
5.0
8
730
5.0
12
460
1. Typical peak current and maximum continuous output current
values are based on 1.2MHz boost switching frequency and
10µH inductor.
The ISL97649AIREVALZ and ISL97649BIREVALZ evaluation
board generates VON and VOFF voltages using unregulated
charge pumps. The VON and VOFF voltages generated are based
on the AVDD output. Table 2 shows different values of VON and
VOFF with different AVDD voltages, loading conditions, and
charge pump (CP) configurations for 1.2MHz switching
frequency.
TABLE 2. TYPICAL VON AND VOFF FOR DIFFERENT LOADING
VOFF (V)
AVDD = 8V AVDD = 8V AVDD = 12V
SINGLE
DUAL
SINGLE
STAGE CP STAGE CP STAGE CP AVDD = 8V AVDD = 12V
1
15.2
23.4
23.8
4.3
4.4
5
15.1
23.2
23.3
4.3
4.3
10
14.7
23.0
23.2
4.2
4.3
2
• WinXP or newer with 512MB of RAM
• 10MB of free hard disk space
• An unused USB port
Notes
This application note contains screenshots of the GUI at the time
this user guide was written. Subsequent GUI versions may appear
differently.
Software Installation
VON and VOFF at Different
Loading Conditions
(mA)
Computer Requirements
The GUI software was developed on a 32-bit Windows XP
platform. Because the GUI software registers as a Human
Interface Device (HID) and uses standard HID calls, it should also
work on other XP or later Windows operating systems (32-bit and
64-bit), including Windows 7.
NOTES:
ILOADING
The next section explains how to install the graphical user
interface (GUI) software, which is used to configure the
ISL97649A/B register and EEPROM.
• Administrator privileges
VIN (V)
VON (V)
ISL97649A/B Evaluation
Software
The following steps explain how to install the ISL97649AIREVALZ,
and ISL97649BIREVALZ software to a PC. The ISL97649A and
ISL97649B software installation steps are the same (the
following examples show ISL97649A) and will install the drivers
and user interface.
Step 1: Download the installer file to the PC. The installer file is
named “ISL97649A_Installer_vX.Y”, where “X.Y” is the
version number (e.g., v1.2). The installer file may be
provided from Intersil on a CD with the evaluation kit, or
as an email attachment.
Step 2: Run the installer file
Step 3: Follow the installation wizard to install the evaluation
software to the PC
AN1646.2
April 4, 2013
Application Note 1646
When the installer file is run, the window in Figure 1 will appear.
Read the License Agreement, and accept or not accept. To move
on with installation, the user has to accept to the License
Agreement, and click Next to proceed to Select Destination
Location (Figure 3).
FIGURE 1. INSTALLER WINDOW
Choose Next to proceed to the License Agreement (Figure 2).
FIGURE 3. SELECT DESTINATION LOCATION
The default directory is C:\Program Files\Intersil\ISL97649A HID.
To specify a directory different from the default location, click the
Browse button. Click Next to continue to the Select Start Menu
Folder (Figure 4).
FIGURE 2. LICENSE AGREEMENT
FIGURE 4. SELECT START MENU FOLDER
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April 4, 2013
Application Note 1646
To specify a folder different from the default, click the Browse
button. Click Next to create the Intersil folder in the Start menu
and proceed to the Ready to Install window (Figure 5).
USB Module Installation
When the ISLUSBCEVAL1Z-REV.A USB module is initially
connected to the PC, Windows XP may display the Found New
Hardware pop-up messages (Figure 8).
FIGURE 5. READY TO INSTALL
Click Install to complete the installation. When Install is clicked,
the following Setup dialog box (Figure 6) will prompt the user to
either select to install or not install some required ActiveX
controls required by the GUI. Depending on the Windows
operating system and controls already installed, these may or
may not be required. Click Yes to install the controls during the
software installation, or No to only install the software. These
controls can always be installed later by re-running the installer.
FIGURE 8. FOUND NEW HARDWARE
The messages mean the USB module has been identified and is
registering itself as a HID on your computer. The process should
complete within a few seconds.
On XP systems, the following pop-up message may appear,
displaying the status of the USB module hardware (Figure 9).
FIGURE 9. HARDWARE INSTALLED NOTIFICATION
FIGURE 6. SETUP
HID USB Module
If a Found New Hardware window appears asking for the location
of device drivers, please contact Intersil for a new USB module.
The ISL97649AIREVALZ, ISL97649BIREVALZ board will be
shipped with an Intersil HID USB Module - ISLUSBCEVAL1Z REV.A
(Figure 7).
FIGURE 7. HID USB MODULE
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April 4, 2013
Application Note 1646
Using the Software
OPEN/RUN THE SOFTWARE
Once the software is installed on the PC, go to the location where
the Start Menu folder was installed (default location is: Start
Menu\Programs\Intersil\ISL97649A HID) and launch the
program.
Prior to loading/opening the main Graphical User Interface
(“GUI”) form, the software will check that an Intersil HID USB
module is connected to the PC. If the module is not connected a
dialog box will pop-up (Figure 10) to indicate that the board is not
found.
Check that the USB cable and an Intersil HID USB module are
properly connected. Choose Retry to try again. If the connection
is good, the GUI form will be opened (Figure 11). However, the
GUI can be opened without the USB module attached. To do this,
choose Cancel in the dialog box.
Once the GUI form opens, the HID Module Status button (labeled
“CONNECT”) will be GREEN in color if the HID USB module is
connected, or RED if it is not connected. Note, if a new module is
connected, or a module is unplugged and then reconnected after
launching the software, the button color will not change
dynamically. The software does not continuously poll to check for
the USB module connection. If connection is lost, to re-establish,
click the CONNECT button.
FIGURE 10. USB CONNECTION
ISL97649A GUI
ISL97649B GUI
FIGURE 11. ISL97649A, ISL97649B GUI WINDOWS
5
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April 4, 2013
Application Note 1646
SOFTWARE FEATURES AND BUTTONS
The ISL97649A/B software has various features and options
making it flexible and easy to use for evaluation of the ISL97649.
The following is a list of the software interface features, buttons,
and options and how to use them effectively.
Read from Data Register: Click on this button, a dialog box will
pop-up to prompt selection of reading from WR or reading from
IVR.
The software allows selection between the 8-bit register and 7-bit
register. The controls of the GUI operate as follows (refer to
Figure 11 to identify the controls).
Display Mode: Choose the Display Mode for the register
value/data by clicking on the radio button. HEX = hexadecimal,
DEC = decimal.
7/8-bit Mode (ISL97649A only): Choose if DCP/calibration
operation is 127 step (7-bit) or 256 step (8-bit) resolution.
DCP Register Slider: Adjusting this slider will automatically send
an I2C transaction to change the WR register value only (not
EEPROM) - when the value is changed, the “Write to EEPROM”
button will begin to flash indicating that the new register value
differs from the EEPROM.
To directly move the vertical slider position:
• Click on the Up/Down arrows of the vertical slider bar to
increment the count by 1. The new code is reflected in the DCP
Value text box.
• Click-hold on the vertical slider bar and drag it to a new
position. The new code is reflected in the DCP Value text box.
• Click anywhere on the vertical slider bar. Clicking above the
current bar level will increment the value by 16dec (0x10).
Clicking below the current bar level will decrement the value by
16dec (0x10).
FIGURE 12. INDICATE TYPE OF READ OPERATION
Click “Yes” to read directly from WR register value only; click “No”
to load IVR (EEPROM) to the WR then read the value; click
“Cancel” to abort.
HID Module Status: Click this button to check the USB
connection. If the connection is good, the button turns GREEN, if
not it will turn RED.
DCP Calculator: The calculator tool allows finding the expected
calibration range and POS voltage based on known resistor
values, or finding resistor values based on a desired calibration
range. The calculator determines a theoretical voltage at the POS
pin, actual VCOM output may vary slightly due to amplifier offset.
Help: Clicking “?” will open a dialog box with additional
information about how to use the IC and GUI.
To directly change the DCP text box value (i.e., DCP register code)
click in the text box to put focus in the box. Then, either highlight
the digit to be changed, or highlight and change all digits. The
software pauses briefly between each keyboard key stroke to
make sure nothing more will be entered, then it accepts the
value to the software. The new code is reflected on the vertical
slider position. Press “Enter” on the PC keyboard to send the I2C
transaction.
Also, once focus has been put on the slider or text entry box (by
clicking), there are keyboard commands that quickly make
deterministic adjustments to the value:
• Page Up key: increments the DCP value by 16dec (0x10)
• Page Down key: decrements the DCP value 16dec (0x10)
• Up Arrow key: increments the DCP value by 1
• Down Arrow key: decrements the DCP value by 1
Write to EEPROM: Click on this button will write the existing DCP
register value into IVR (i.e., EEPROM).
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April 4, 2013
Application Note 1646
Evaluation Board Design Schematic
JP5
VIN
JP6
AVDD
2
C6
C5
C410uF/25V C7
JP7
C20
MBRM120T3
PGND
C3
C2
C1
OPEN 10uF/6.3V 10uF/6.3V
15nF
R12
5.5K
0.1uF
OPEN
VIN
1
10uH
C27
10uF/25V
10uF/25V
2
L1
LX
73.2K
Vin
0
R19
C32
0.1uF/6.3V
OPEN
D1
OPEN
R1
R28
0 R29
C34
LX
AVDD
R2
8.06K
OPEN
1
10K
C30
C29
OPEN
3
3
R21
C36
0.1uF/6.3V
24
C21
22nF
23
25
27
26
28
LDO_VIN
AVDD GND
JP4 LDO_VIN
C25
SS
FREQ
FB
COMP
VIN
1
LX
EN
U1
L_IN
22
CD2
1uF/25V
C26
2
CE
100pF
4
100K
RE
JP1
RESET
VGH
VGH_M
D3
BAT54S
C24
U2
19
RESET
6
ADJ
VGHM
VDIV
VFLK
NEG
18
OPEN
85K
C17
1nF/16V
RSET
POS
SDA
1
VIN
VOUT
R22
22K
R8
133K
R9
10K
R13
100K
OPEN
SDA
SCL
I2C Interface Board
GPM_LO
MMBT3906
1
R6
1k
C16
1uF/16V
AVDD
1
D4
BAT54S
JP3
RSET
C22
3
2
R7
83K
100KR26
C15
0.1uF/25V Q1
VDIV
R27
0
2
R15
115K
C18
0.47uF/25V
C11
0.1uF/25V
15
14
VFLK
10
13
C8
47nF/25V
R3
C23
OPEN
VOUT
39K
R14
16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
C35
R18
17
ISL97649A
SCL
C10
47nF/25V
12
LX
VDPM
C12 VON
1uF/25V
3
3
8
C9
1uF/25V
11
C33
0.1uF/25V
AVDD
7
GPM_LO
1500pF
2
9
1
10
2
R17
82.5K
10K
C13
1
AVDD
VLOGIC_GND
VLOGIC
2.2uF/10V
RESET
R16
5
OPEN
L_OUT
20
3
R5
R4
D2
BAT54S
21
1nF
3
1
JP2
CD2
C14
0.1uF/50V
C28
VGH
PGND
AVDD
2
1 2
0
R30
SGND
C19
0.47uF/25V
R10
VOFF
OPEN
R11
OPEN
Z1
MMSZ5231B
VIN
VIN
SDA
SCL
SDA
R24
OPEN
SCL
C31
Z2
R25
OPEN
OPEN
Title
OPEN
Size
Number
Revision
B
Date:
File:
Layout Recommendation
The device performance (including efficiency, output noise,
transient response and control loop stability) is dramatically
affected by the PCB layout. PCB layout is critical, especially at
higher switching frequency.
Here are some general guidelines for layout:
1. Place the external power components (input capacitors,
output capacitors, boost inductor and output diodes, etc.) in
close proximity to the device. Traces to these components
should be kept as short and wide as possible to minimize
parasitic inductance and resistance.
2. Place VIN bypass capacitors close to the pins.
3. Shorten the trace length from the LX pin to the FB pin. Place
the L1 inductor and D1 diode as close as possible to the LX
pin in order to minimize the voltage noise and current loop on
large AC amplitude and fast slew rate signal at the LX node.
14-Jun-2012
Sheet of
C:\YT\Project\Display\ISL97649EVA\EVAL
Drawn
Board\ISL97649AEVA.d
By:
6. The exposed die plate should be soldered to an equivalent
area of metal on the PCB. This contact area should have
multiple via connections to the back of the PCB as well as
connections to intermediate PCB layers, if available, to
maximize thermal dissipation away from the IC.
7. To minimize the thermal resistance of the package when
soldered to a multi-layer PCB, the amount of copper track and
ground plane area connected to the exposed die plate should
be maximized and spread out as far as possible from the IC.
Especially, the top and bottom areas of the PCB should be
maximized to allow thermal dissipation to the surrounding air.
8. Minimize feedback input track lengths to avoid switching
noise pick-up.
The ISL97649AIREVALZ, ISL97649BIREVALZ layout beginning on
page 8, is provided to illustrate the proper layout
implementation.
4. The feedback network should sense the output voltage
directly from the point of load, and should be placed close to
the IC but as far away from the LX node as possible.
5. The power ground (PGND) plane and signal ground (SGND)
plane should be connected at only one point on the PCB near
the device.
7
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April 4, 2013
Application Note 1646
ISL97649AIREVALZ, ISL97649BIREVALZ Layout
FIGURE 13. EVALUATION BOARD ASSEMBLY LAYER
FIGURE 14. TOP LAYER
8
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April 4, 2013
Application Note 1646
ISL97649AIREVALZ, ISL97649BIREVALZ Layout
(Continued)
FIGURE 15. BOTTOM LAYER
9
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April 4, 2013
Application Note 1646
TABLE 3. BOM FOR ISL97649AIREVALZ, ISL97649BIREVALZ EVALUATION BOARD
PART TYPE
DESIGNATOR
FOOTPRINT
73.2k
R1
0603
8.06k
R2
0603
10
R3
0603
OPEN
R4, R24, R25, R28
0603
100k
R5, R10, R11, R13, R26
0603
1k
R6
0603
83k
R7
0603
133k
R8
0603
10k
R9, R16, R21
0603
5.5k
R12
0603
85k
R14
0603
115k
R15
0603
82.5k
R17
0603
39k
R18
0805
0
R19, R27, R29, R30
0603
22k
R22
0603
10µF/6.3V
C1, C2
0805
OPEN
C3
0805
10µF/25V
C4, C5, C6
1210
0.1µF
C7
0603
47nF/25V
C8
0603
1µF/25V
C9, C12
0603
47nF/25V
C10
0603
0.1µF/25V
C11, C15
0603
1500pF
C13
1206
100pF
C14
0603
1µF/16V
C16, C17
0603
0.47µF/25V
C18
0603
0.47µF/25V
C19
0805
15nF
C20
0603
22nF
C21
0603
OPEN
C22, C23, C27, C29, C30, C31, C34, C35
0603
2.2µF/10V
C24
0603
1µF/25V
C25
0603
1nF
C26
0603
0.1µF/50V
C28
1210
0.1µF/6.3V
C32, C36
0603
0.1µF/25V
C33
0603
MBRM120T3
D1
Case475
BAT54S
D2
SOT-23
10
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April 4, 2013
Application Note 1646
TABLE 3. BOM FOR ISL97649AIREVALZ, ISL97649BIREVALZ EVALUATION BOARD (Continued)
PART TYPE
DESIGNATOR
FOOTPRINT
BAT54S
D3
SOT-23
BAT54S
D4
SOT-23
JUMPER
JP1, JP2, JP4, JP5
JUMPER-2PIN
JUMPER
JP3, JP6, JP7
JUMPER-3PIN
10µH
L1
RLF7030
MMBT3906
Q1
SOT-23
ISL97649
U1
QFN28 4X5MM
MMSZ 5233B
Z1
SOD-123
OPEN
Z2
SOD-123
AVDD
AVDD
POWERPOST
AVDD_GND
AVDD_GND
POWERPOST
CD2
CD2
POWERPOST
GPM_LO
GPM_LO
POWERPOST
LDO_VIN
LDO_VIN
POWERPOST
PGND
PGND
POWERPOST
RESET
RESET
POWERPOST
RSET
RSET
POWERPOST
SCL
SCL
POWERPOST
SDA
SDA
POWERPOST
SGND
SGND
POWERPOST
VDIV
VDIV
POWERPOST
VFLK
VFLK
POWERPOST
VGH
VGH
POWERPOST
VGH_M
VGH_M
POWERPOST
VIN
VIN
POWERPOST
VLOGIC
VLOGIC
POWERPOST
VLOGIC_GND
VLOGIC_GND
POWERPOST
VOFF
VOFF
POWERPOST
VON
VON
POWERPOST
VOUT
VOUT
POWERPOST
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is
cautioned to verify that the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
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