MAX1583 Datasheet, PDF (2/5 Pages) Maxim Integrated Products – MAX1583 Evaluation Kit

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 connec-
tions 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 nega-
tive lead of the DMM to the GND pad. This DMM
measures the voltage at OUT (V_OUT).
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 mea-
sures the voltage at POK (V_POK).
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. V_OUT
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 V_OUT does not change.
12) Set the power supply to 2.7V.
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
V_OUT is approximately 23.5V and V_POK is approxi-
mately 2.7V.
15) Sweep the power supply to 5.5V. Verify that the LED
module remains off, V_OUT is approximately 23.5V,
and V_POK tracks V_VIN.
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 shut-
down 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 corre-
sponding shunt completely from the jumper and con-
necting the external signal to the appropriate connect-
ing 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 / I_LED(STROBE). The MAX1583 can reg-
ulate strobe-mode LED currents up to 300mA; however,
the LED installed on the MAX1583 EV kit has a maxi-
mum 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 off-
board 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.
2 _______________________________________________________________________________________