19-4247; Rev 0; 9/08
MAX16816 Evaluation Kit
General Description
The MAX16816 evaluation kit (EV kit) demonstrates the
programmable MAX16816 current-mode, high-brightness
LED (HBLED) driver IC. The EV kit is configured as a step-
down/step-up (buck-boost) topology circuit with peak
inductor current control and DC LED current control for
driving external LEDs. The EV kit operates from a DC sup-
ply voltage of 9V to 40V and is configured to deliver 1.33A
of current. The maximum output voltage of the LED string
can be up to 28V. The EV kit can be configured for analog
PWM- or digital-PWM-controlled dimming operation using
either an analog linear DC voltage or a digital PWM input
signal to control the LEDs’ brightness. This EV kit has an
undervoltage lockout (UVLO) feature that disables the EV
kit, and overvoltage protection that protects the circuit
under no-load or open HBLED conditions. The EV kit cir-
cuit demonstrates the MAX16816 IC’s clock output and
features an input for synchronizing to an external clock.
The EV kit uses a 1-Wire
®
interface for programming
the MAX16816 IC’s nonvolatile EEPROM. Adjustable
features include programmable LED current (binning),
external MOSFET gate driver supply voltage, leading-
edge blanking time, digital soft-start duration, RTSYNC
oscillator enable/disable, and slope compensation. The
EV kit includes Windows
®
2000/XP/Vista
®
-compatible
software that provides a simple graphical user interface
(GUI) for updating the MAX16816 EEPROM. Visit
www.maxim-ic.com/evkitsoftware to download the latest
version of the EV kit software. The EV kit can also inter-
face with a user-supplied 1-wire interface circuit for
stand-alone MAX16816 operation.
Caution: Do not power up the MAX16816 EV kit with-
out connecting a load to the LED+ and LED- PCB pads.
Warning: Voltages exceeding 42V may exist on the
LED+ and LED- output pads.
o
1.33A Output Current
o
Analog PWM- and Digital-PWM-Controlled
Dimming
o
Output Overvoltage Protection
o
Demonstrates Buffered Clock Output
o
Programmable EEPROM Controlling
LED Current (Binning)
External MOSFET Gate Driver Supply Voltage
Leading-Edge Blanking Time
Digital Soft-Start Duration
RTSYNC Oscillator Enable/Disable
Slope Compensation
o
Nonvolatile EEPROM for Saving Register Values
o
USB-PC Connection (Cable Included)
o
USB-Powered USB-to-1-Wire Interface Circuit
o
1-Wire Interface Terminals for Evaluating a User-
Supplied 1-Wire Interface
o
Windows 2000/XP/Vista (32-Bit)-Compatible
Software
o
Lead-Free and RoHS Compliant
o
Fully Assembled and Tested
Features
o
9V to 40V Wide Supply Voltage Range
Evaluates: MAX16816
Ordering Information
PART
MAX16816EVKIT+
TYPE
EV Kit
+Denotes
lead-free and RoHS compliant.
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
Windows and Windows Vista are registered trademarks of Microsoft Corp.
Component List
DESIGNATION
C1, C3, C4, C5,
C15, C18,
C20–C25
C2
C6
C7, C19
QTY
12
DESCRIPTION
0.1µF ±10%, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H104K
1µF ±10%, 16V X7R ceramic
capacitor (0603)
Murata GRM188R71C105K
Not installed, capacitor (0603)
10µF ±10%, 16V X7R ceramic
capacitors (1206)
Murata GRM31CR71C106K
C10, C11, C12
3
DESIGNATION
C8
QTY
1
DESCRIPTION
100µF ±20%, 50V electrolytic
capacitor (10.3mm x 10.3mm)
Panasonic EEEFC1H101P
10µF ±10%, 50V X7S ceramic
capacitor (1210)
Taiyo Yuden UMK325BJ106KM
4.7µF ±10%, 100V X7R ceramic
capacitors (2220)
Murata GRM55ER72A475K
1
0
2
C9
1
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX16816 Evaluation Kit
Evaluates: MAX16816
Component List (continued)
DESIGNATION
C13
QTY
1
DESCRIPTION
0.047µF ±10%, 50V X7R ceramic
capacitor (0603)
TDK C1608X7R1H473K
1000pF ±10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H102K
100pF ±5%, 50V C0G ceramic
capacitors (0603)
Murata GQM1885C1H101J
27pF ±5%, 50V C0G ceramic
capacitors (0402)
Murata GRM1555C1H270J or
Panasonic ECJ0EC1H270J
3300pF ±10%, 50V X7R ceramic
capacitor (0603)
TDK C1608X7R1H332K
470pF ±5%, 50V C0G ceramic
capacitors (0603)
Murata GRM1885C1H471J
100V, 300mA diode (SOD123)
Diodes Inc. 1N4148W-7-F
(Top Mark: T4)
Not installed, diode (SOD123)
100V, 3A Schottky diode (PowerDI 5)
Diodes Inc. PDS3100
100V, 1A Schottky diode (SMA)
Diodes Inc. B1100-13-F
Not installed, ferrite-bead inductor
(0603)
2-pin header
Not installed, inductor (14.9mm x
14.9mm)
10µH, 9.2A inductor (14.9mm x
14.9mm)
Sumida CDEP147NP-100MC-125
60V, 3.2A n-channel MOSFET
(6 TSOP)
Vishay Si3458DV-T1-E3
(Top Mark: 58)
100V, 42A n-channel MOSFET (D-Pak)
International Rectifier IRLR3110ZPBF
Not installed, MOSFET (D-Pak)
60V, 115mA n-channel MOSFET
(SOT23)
Fairchild 2N7002
U2
U3
USB
Y1
—
—
—
1
1
1
1
1
1
1
DESIGNATION
R1
R2
R3
R4
R5
R6, R7
R8
R9
R10, R15
R11, R28
R12
R13
R14
R16, R17
R18
R19
R20, R21
R22
R23
R25, R26, R27
TP1
U1
QTY
1
1
1
1
1
2
0
1
2
2
1
1
1
2
1
1
2
1
1
3
0
1
DESCRIPTION
73.2kΩ ±1% resistor (0603)
12.4kΩ ±1% resistor (0603)
0.1Ω ±1%, 500mW sense resistor
(1206)
IRC LRC-LR-1206LF-01-R100-F
100Ω ±5% resistor (0603)
1Ω ±5% resistor (0805)
0.04Ω ±1%, 2W sense resistors
(2512)
IRC LRC-LR-2512LF-01-R040-F
Not installed, resistor (0805)
280kΩ ±1% resistor (0603)
4.99kΩ ±1% resistors (0603)
1kΩ ±1% resistors (0603)
3.32kΩ ±1% resistor (0603)
42.2kΩ ±1% resistor (0603)
100kΩ single-turn potentiometer
27Ω ±5% resistors (0603)
1.5kΩ ±5% resistor (0603)
470Ω ±5% resistor (0603)
10kΩ ±5% resistors (0603)
3.24kΩ ±5% resistor (0603)
2.2kΩ ±5% resistor (0603)
0Ω ±5% resistors (0603)
Not installed, small PCB test point
Current-mode HBLED driver
(32 TQFN-EP*)
Maxim MAX16816ATJ+
UART- to-USB converter
(32 TQFP)
93C46 3-wire 16-bit EEPROM
(8 SO)
USB type-B right-angle female
receptacle
6MHz crystal
Shunt (JU1)
USB high-speed A-to-B cable, 6ft
PCB: MAX16816 Evaluation Kit+
C14
1
C16, C17
2
C26, C27
2
C28
1
C29, C30
2
D1
D2
D3
D4
FB1
JU1
L1
1
0
1
1
0
1
0
L2
1
N1
1
N2
N3
N4, N5
1
0
2
*EP
= Exposed pad.
2
_______________________________________________________________________________________
MAX16816 Evaluation Kit
Component Suppliers
SUPPLIER
Diodes Inc.
Fairchild Semiconductor
International Rectifier
IRC, Inc.
Murata Electronics North America, Inc.
Panasonic Corp.
Sumida Corp.
Taiyo Yuden
TDK Corp.
Vishay
PHONE
805-446-4800
888-522-5372
310-322-3331
361-992-7900
770-436-1300
800-344-2112
847-545-6700
800-348-2496
847-803-6100
402-563-6866
WEBSITE
www.diodes.com
www.fairchildsemi.com
www.irf.com
www.irctt.com
www.murata-northamerica.com
www.panasonic.com
www.sumida.com
www.t-yuden.com
www.component.tdk.com
www.vishay.com
Evaluates: MAX16816
Note:
Indicate that you are using the MAX16816 when contacting these component suppliers.
MAX16816 EV Kit Files
FILE
INSTALL.EXE
MAX16816.EXE
FTD2XX.DLL
UNINST.INI
DESCRIPTION
Installs the EV kit files on your
computer
Application program
USB device driver file
Uninstalls the EV kit software
Quick Start
Required Equipment
Before beginning, the following equipment is needed:
• MAX16816 EV kit (USB cable included)
• A user-supplied Windows 2000/XP/Vista PC with a
spare USB port
• 9V to 40V, 4A DC power supply
• A series-connected LED string rated at 1.5A (28V
max)
• A digital multimeter (DMM) fused for 10A current
measurement
Note:
In the following sections, software-related items
are identified by bolding. Text in
bold
refers to items
directly from the EV kit software. Text in
bold and under-
lined
refers to items from the Windows operating system.
Procedure
The MAX16816 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed and do not power up the
MAX16816 EV kit without connecting a load to the
LED+ and LED- PCB pads.
Warning: Voltages exceeding 42V may exist on the
LED+ and LED- output pads.
1) Visit
www.maxim-ic.com/evkitsoftware
to down-
load the latest version of the EV kit software,
16816Rxx.ZIP. Save the EV kit software to a tempo-
rary folder and uncompress the ZIP file.
2) Install the EV kit software on your computer by run-
ning the INSTALL.EXE program inside the tempo-
rary folder. The program files are copied and icons
are created in the Windows
Start | Programs
menu. Do not run the EV kit software until step 15.
3) Connect the USB cable from the PC to the EV kit
board. A
New Hardware Found
window pops up
when installing the USB driver for the first time. If
you do not see a window that is similar to the one
described above after 30s, remove the USB cable
from the board and reconnect it. Administrator privi-
leges are required to install the USB device driver
on Windows.
4) Follow the directions of the
Add New Hardware
Wizard
to install the USB device driver. Choose
the
Search for the best driver for your device
option. Specify the location of the device driver to
be
C:\Program Files\MAX16816
(default installa-
tion directory) using the
Browse
button. During
device driver installation, Windows might show a
warning message indicating that the device driver
Maxim uses does not contain a digital signature.
This is not an error condition and it is safe to pro-
ceed with installation.
5) Once the hardware installation is complete, discon-
nect the USB cable from the EV kit.
6) Verify that a shunt is installed across jumper JU1
(analog PWM-dimming control).
3
_______________________________________________________________________________________
MAX16816 Evaluation Kit
Evaluates: MAX16816
7) Connect the anode of the LED string to the LED+
PCB pad and the cathode to the DMM’s positive-
current terminal.
8) Connect the DMM’s negative-current terminal to the
LED- PCB pad.
9) Set the power-supply output to 12V and disable the
power-supply output.
10) Connect the power supply’s positive terminal to the
VIN PCB pad and the negative terminal to the
PGND PCB pad.
11) Connect the USB cable to the EV kit.
12) Enable the power-supply output.
13) Adjust potentiometer R14 clockwise by one full turn
to obtain a 100% duty cycle.
14) Verify that the DMM measures an LED current of
1.33A DC.
15) Start the MAX16816 EV kit software by opening its
icon in the
Start | Programs
menu. The EV kit soft-
ware main window appears, as shown in Figure 1.
Figure 1. MAX16816 EV kit Software Main Window
4
_______________________________________________________________________________________
MAX16816 Evaluation Kit
Detailed Description of Software
The main window of the MAX16816 EV kit software
(Figure 1) displays a drop-down list for each of the
MAX16816 IC’s programmable features. The drop-
down lists adjust the following programmable features:
LED current (binning), external MOSFET gate driver
supply voltage, leading-edge blanking time, digital soft-
start duration, RTSYNC oscillator enable/disable, and
slope compensation.
Upon software startup, the EV kit USB-to-I
2
C circuit and
EV kit software force the MAX16816 IC U1 into program-
ming mode by starting communication with U1. In pro-
gramming mode, the USB programming circuit controls
the U1 UVEN pin, for enabling/disabling U1, and the U1
FAULT
pin as a 1-wire data/clock port. The software ini-
tially reads the U1’s scratchpad registers and displays
the active values in the drop-down lists. These values
are loaded to the scratchpad registers from U1’s non-
volatile EEPROM upon IC power-up. Selecting a value
from any of the drop-down lists writes to the IC’s scratch-
pad registers, modifying the EV kit’s active values.
Press the
Write EE
button to write the scratchpad
register values to U1’s EEPROM. Press the
Read EE
button to read the EEPROM values. Pressing the
Read
EE
button prior to pressing the
Write EE
button over-
writes the current drop-down list values. Press the
Exit
EE
button to exit programming mode, restoring the
UVEN and
FAULT
pins’ standard functionality. Refer to
the
EEPROM and Programming
section in the
MAX16816 IC data sheet for more information.
Leading-Edge Blanking Time
The MAX16816 IC features a programmable built-in
blanking circuit for the current-sense signal that pre-
vents premature termination of the on cycles. Set a
blanking time by selecting a value between 75ns and
150ns using the
SENSE Signal Blanking Time (BLNK)
drop-down list. To increase blanking time beyond
150ns, install a 0603 ceramic capacitor at C6 between
100pF and 1000pF.
Refer to the
Blanking Time Adjustment Register (BLNK)
section in the MAX16816 IC data sheet for additional
information.
Evaluates: MAX16816
Digital Soft-Start
Select a soft-start delay time between 0 (no delay) to
4.096ms by using the
Digital Soft Start Duration (SS)
drop-down list. Setting the soft-start delay time to a low
value could cause improper LED driver startup. Refer to
the
Soft-Start
section in the MAX16816 IC data sheet for
more information on this feature.
Oscillator Settings
Select
OFF
from the
RTOSC On / Off (RTOF)
drop-
down list to enable the MAX16816 IC’s internal 125kHz
oscillator. Select
ON
from the
RTOSC On / Off (RTOF)
drop-down list to enable the RTSYNC oscillator.
Slope Compensation
Select a peak ramp voltage for slope compensation
between 0 and 300mV by using the
Slope
Compensation (ESLP)
drop-down list. Refer to the
Slope Compensation
section in the MAX16816 IC data
sheet for more information on choosing a value.
Connection Settings and Tools
Click the
Connection
menu item to attempt a recon-
nect with the EV kit or to exit the software. Click the
Tools
menu item to view the software message log or
to set the 1-wire clock speed.
Detailed Description of Hardware
The MAX16816 EV kit demonstrates the MAX16816
current-mode HBLED driver IC. The EV kit is config-
ured in a step-down/step-up (buck-boost) topology
with peak current control and DC current control for a
string of user-supplied HBLEDs. The EV kit operates
from a DC supply voltage of 9V to 40V and requires up
to 4A. The circuit is configured to deliver 1.33A of cur-
rent into a series LED string with a maximum of 28V
forward voltage.
The EV kit sets the maximum peak-series inductor cur-
rent to 8.3A using parallel resistors R6 and R7. The DC
LED current is set to 1.33A using resistor R3. A
CLKOUT PCB pad is available to monitor the oscillator
frequency. A DIM PCB pad is also provided for analog
PWM- or digital PWM-dimming operation of the external
LEDs, and to monitor the analog DC voltage applied to
the MAX16816 IC DIM pin.
Binning Adjustment Voltage
Set a value of V
SS
(binning adjustment voltage)
between 100mV and 166.67mV using the
Binning
Adjust (BIN)
drop-down list. Refer to the
Load Current
Sense
section in the MAX16816 IC data sheet for addi-
tional information on adjusting the binning voltage.
Gate Driver Supply Voltage
Select a REG2 output voltage between 5V to 15V by
using the
Gate Driver Power Supply Voltage (DRSP)
drop-down list. On the EV kit, the REG2 output voltage
is the supply voltage for the primary switching MOSFET
driver (DRV). Refer to the
Regulators (REG1, REG2,
CLAMP)
section in the MAX16816 IC data sheet for
more information on setting the REG2 output voltage.
_______________________________________________________________________________________
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
