MAXIM MAX1583ZETB

19-3246; Rev 0; 4/04
MAX1583 Evaluation Kit
The MAX1583 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board for evaluating
the MAX1583 white LED flash boost converter. The EV
kit accepts a 2.6V to 5.5V input voltage and drives up
to five series white LEDs with a constant current to provide camera flash/strobe in cell phones, PDAs, DSCs,
and other hand-held devices. The MAX1583 switching
frequency is 1MHz, allowing tiny external components.
Two logic inputs control four modes of operation: shutdown mode (0.5µA max), movie mode for high-efficiency continuous lighting (programmable up to 100mA),
precharge mode for charging a reservoir capacitor to
24V while the LEDs are off (POK output indicates a full
reservoir capacitor), and strobe mode for firing the flash
during an exposure with a regulated current programmable up to 300mA (100mA with installed components). A pushbutton pulse generator is installed to simulate a 30ms flash pulse.
The MAX1583 comes with the MAX1583X (1A current
limit) installed, but the entire MAX1583 family can be evaluated with this EV kit with minor component changes.
Features
♦ Supports Up to 5 LEDs for Strobe/Flash
♦ Four Operational Modes
Strobe: Up to 300mA (Preset to 100mA)
Precharge: With POK Indicator
Movie: Up to 100mA (Preset to 20mA)
Shutdown: 0.01µA (typ) Quiescent Current
♦ Input Current Limiting
1A (MAX1583X)
500mA (MAX1583Y)
250mA (MAX1583Z)
♦ 24V Output Overvoltage Protection
♦ 80% Efficient (PLED / PIN) Movie Mode
♦ Thermal-Shutdown Protection
♦ 10-Lead 3mm x 3mm TDFN Package
♦ Surface-Mount Components
♦ Fully Assembled and Tested
Ordering Information
PART
TEMP RANGE
MAX1583EVKIT
0°C to +70°C
IC PACKAGE
10 TDFN 3mm x 3mm
Note: To evaluate the MAX1583Y or MAX1583Z, request a
MAX1583YETB or MAX1583ZETB free sample with the
MAX1583 EV kit.
Component List
DESIGNATION QTY
C1
C2
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
1
22µF, 6.3V X5R ceramic capacitor
(0805)
TDK C2012X5R0J226M
D2
1
White LED module
Nichia NBCW011T
D5
1
1
10µF ±10%, 25V X5S ceramic
capacitor (1206)
Taiyo Yuden TMK316C106KL
30V, 100mA Schottky diode (SOD
523)
Central Semiconductor CMOSH-3
JU1, JU2
2
3-pin headers
1
2-pin header
2
0.01µF ±10%, 16V X7R ceramic
capacitors (0402)
TDK C1005X7R1E103K
JU3
C3, C4
L1
1
4.7µH, 1.06A, 450mΩ
TOKO 984FB-4R7M
1
6.04kΩ ±1% resistor (0402)
1
0.1µF ±10%, 25V X7R ceramic
capacitor (0603)
TDK C1608X7R1E104K
R1
C5
R2
1
3.01kΩ ±1% resistor (0402)
R3, R4, R5
3
100kΩ ±5% resistors (0402)
SW1
1
Momentary pushbutton switch
Panasonic EVQ-PHP03T
D1
1
30V, 500mA, VF = 0.4V Schottky
diode (SOD-323)
Diodes, Inc. B0530WS
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
Evaluates: MAX1583
General Description
Evaluates: MAX1583
MAX1583 Evaluation Kit
Component List (continued)
DESIGNATION QTY
DESCRIPTION
U1
1
MAX1583XETB (10-pin TDFN)
U2
1
MAX6422XS23 (SOT23)
None
2
Shunts
None
1
MAX1583 EV kit PC board
Recommended Equipment
• 0 to +6V at 1A, variable-output power supply
• Two digital multimeters (DMMs)
Quick Start
The MAX1583 EV kit is fully assembled and tested.
Perform the following steps to verify board operation:
1) Verify that shunts are across pins 2 and 3 of
jumpers JU1 (EN2) and JU2 (EN1). This places the
MAX1583 into shutdown mode.
2) Verify that JU3 is open.
3) Preset the power supply to 2.7V and turn off. Do
not turn on the power supply until all connections are completed.
4) Connect the positive lead of the power supply to the
VIN pad on the EV kit PC board. Connect the
ground lead of the power supply to the GND pad on
the EV kit PC board.
5) Connect the positive lead of one DMM to the OUT
pad on the EV kit PC board and connect the negative lead of the DMM to the GND pad. This DMM
measures the voltage at OUT (VOUT).
6) Connect the positive lead of the other DMM to POK
on the EV kit PC board and connect the negative
lead of the DMM to the GND pad. This DMM measures the voltage at POK (VPOK).
7) Turn on the power supply.
8) Verify that the white LED module is off.
9) Remove the shunt on JU2 and place it between
pins 1 and 2 of JU2. This places the MAX1583 into
movie mode.
10) Verify that the white LED module lights up. VOUT
should read approximately 7V.
11) Sweep the input voltage from 2.7V to 5.5V, verifying
that the LED module remains on with constant
brightness and VOUT does not change.
12) Set the power supply to 2.7V.
2
13) Remove the shunt on JU2 and place it between
pins 1 and 2 of JU3. Remove the shunt on JU1 and
place it between pins 1 and 2 of JU1. This places
the MAX1583 into precharge mode.
14) Verify that the white LED module is off. Verify that
VOUT is approximately 23.5V and VPOK is approximately 2.7V.
15) Sweep the power supply to 5.5V. Verify that the LED
module remains off, VOUT is approximately 23.5V,
and VPOK tracks VVIN.
16) Set the power supply to 3.3V.
17) Push the button on the bottom of the EV kit. This
enables a strobe/flash.
18) Verify that the LED module flashes.
Detailed Description
Jumper Selection
EN1 and EN2 on the MAX1583 provide control for shutdown mode, movie mode, precharge mode, and strobe
mode. Jumpers JU1 and JU2 connect EN2 and EN1 to
either VIN or GND (see Table 1). An external signal can
be used to drive EN1 or EN2 by removing the corresponding shunt completely from the jumper and connecting the external signal to the appropriate connecting pad. JU3 enables the pulse generator for the strobe
mode. JU3 must be open if a jumper is installed on
JU2 or if EN1 is externally driven.
Setting LED Current
The preset LED current in movie mode is 20mA. To set
a different movie-mode LED current, change R2, where
R2 = 60 / I LED(MOVIE). The MAX1583 is capable of
movie-mode currents up to 100mA.
The preset LED current in strobe mode is 100mA. To
set a different strobe-mode LED current, change R1,
where R1 = 600 / ILED(STROBE). The MAX1583 can regulate strobe-mode LED currents up to 300mA; however,
the LED installed on the MAX1583 EV kit has a maximum pulse-current rating of 100mA. If larger currents
are desired, a new LED with a higher pulsed current
rating must be installed on the EV kit.
Evaluating Off-Board LEDs
The MAX1583 EV kit allows for easy evaluation of offboard LEDs. To evaluate off-board LEDs, first remove
the installed LED module, D2. Next, connect the pad
labeled OUT on the EV kit to the anode of the series
LED string under evaluation and connect the cathode
of the external series LED string to the EV kit pad
labeled LED.
_______________________________________________________________________________________
MAX1583 Evaluation Kit
The MAX1583 EV kit includes a pulse generator for convenience in evaluating the strobe function of the
MAX1583. The strobe pulse width is determined by C4.
To change the pulse width of the strobe, replace C4 with
a capacitor corresponding to the following equation:
The minimum pulse width of the pulse generator is
1ms. Using a strobe pulse longer than 30ms may
require a larger output reservoir capacitance (C2).
Refer to the Reservoir Capacitance vs. Current Limit
section in the MAX1583 data sheet for details on calculating the required capacitance.
t
− 275µs
C4 = PULSE
2.73 × 106
Table 1. JU1 and JU2 Functions (Dimming Control)
JU2 POSITION
EN1
JU1 POSITION
EN2
MAX1583 OUTPUT
1 and 2
Connected to VIN
1 and 2
Connected to VIN
1 and 2
Connected to VIN
Strobe Mode
2 and 3
Connected to GND
2 and 3
Movie Mode
Connected to GND
1 and 2
Connected to VIN
Precharge Mode
2 and 3
Connected to GND
2 and 3
Connected to GND
Shutdown Mode
Component Suppliers
SUPPLIER
Diodes, Inc.
Nichia
COMPONENT
PHONE
Schottky Diode
805-440-4800
WEBSITE
www.diodes.com
LEDs
717-285-2323
www.nichia.com
Resistors
714-373-7366
www.maco.panasonic.co.jp
Taiyo Yuden
Capacitors
408-573-4150
www.t-yuden.com
TDK
Capacitors
888-835-6646
www.component.tdk.com
Panasonic
Note: Indicate that you are using the MAX1583 when contacting these suppliers.
_______________________________________________________________________________________
3
Evaluates: MAX1583
Changing the Strobe Pulse Width
Evaluates: MAX1583
MAX1583 Evaluation Kit
VIN
L1
4.7µH
VIN
2
C1
22µF
R3
100kΩ
1
POK
5
LX
IN
GND
POK
OUT
1
JU1
7
C5
0.1µF
EN2
3
LED
4
R1
6.04kΩ
1%
GND
3
9
STB
MOV
EN1
R2
3.01kΩ
1%
VIN
OUT
8
MAX1583XETB
2
D1
C2
10µF
U1
EN2
10
6
1
EN1
2
3
JU2
JU3
VIN
R5
100kΩ
R4
100kΩ
D5
RESET
VCC
SW1
C3
0.01µF
U2
MAX6422XS23
SRT
GND
C4
0.01µF
Figure 1. MAX1583 EV Kit Schematic
4
_______________________________________________________________________________________
D2
WHITE LED
MODULE
LED
MAX1583 Evaluation Kit
Evaluates: MAX1583
Figure 2. MAX1583 EV Kit Component Placement Guide—Top
Silkscreen
Figure 3. MAX1583 EV Kit PC Board Layout—Component Side
Figure 4. MAX1583 EV Kit PC Board Layout—Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5
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Printed USA
is a registered trademark of Maxim Integrated Products.