Rainbow Electronics MAX1583 - Manual (Page 6)

MAX1583
White LED Camera-Flash
Boost Converter
6 _______________________________________________________________________________________
PIN NAME FUNCTION
1 GND Ground. Connect to exposed paddle.
2 IN Input Voltage Supply. Input voltage range is 2.6V to 5.5V. Bypass IN to GND with a 4.7µF ceramic capacitor.
3 MOV
Movie Current-Set Input. Connect a resistor from MOV to GND to set the LED current for movie-mode
operation. R
MOV
= 60 / I
LED
(where R
MOV
> 600k Ω).
4 STB
Strobe Current-Set Input. Connect a resistor from STB to GND to set the LED current for strobe-mode
operation. R
STB = 600 / I LED (where R STB > 2k Ω).
5 POK P ow er - O K O utp ut. P ul l ed to GN D d ur i ng p r echar g e m od e. P OK g oes hi g h i m p ed ance once V OU T r eaches 24V .
6 EN1 Enable 1. EN1 and EN2 are digital inputs that determine the operational mode of the MAX1583. See Table 1.
7 EN2 Enable 2. EN1 and EN2 are digital inputs that determine the operational mode of the MAX1583. See Table 1.
8 OUT
Output-Voltage Sense Input. The boost-converter circuit in the MAX1583 is disabled once V OUT is greater
than 24V. When V OUT falls below 23.5V, the converter is enabled.
9 LED
LED Return Input. Connect to the cathode of the series LEDs. Regulates to 0.6V in movie mode. LED is high
impedance during shutdown and precharge mode.
10 LX
Inductor Connection. Drain of the internal power MOSFET. Connect to the switched side of the inductor. LX is
high impedance during shutdown.
— EP Exposed Paddle. Connect to the circuit ground plane.
Pin Description
Functional Diagram
MAX1583
CURRENT REGULATOR
ENABLE
DECODE
BOOST-CONVERTER
CONTROL
CURRENT-LIMIT
THRESHOLD CURRENT-LIMIT
COMPARATOR
THERMAL
LIMIT
POK CIRCUITRY
REFERENCE
POK
COMPARATOR
MOVIE-MODE
FEEDBACK
COMPARATOR
LX
POK
OUT
LED STB
MOV
EN2
EN1
IN
GND
N
N
N