Changing the Strobe Pulse Width

The MAX1583 EV kit includes a pulse generator for con-

venience 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 calcu-

lating the required capacitance.

C

ts

PULSE

4

275

273 10

6

=

−

×

µ

.

MAX1583 Evaluation Kit

_______________________________________________________________________________________

3

JU2 POSITION

EN1

JU1 POSITION

EN2

MAX1583 OUTPUT

1 and 2

Connected to VIN

1 and 2

Connected to VIN

Strobe Mode

1 and 2

Connected to VIN

2 and 3

Connected to GND

Movie Mode

2 and 3

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

Table 1. JU1 and JU2 Functions (Dimming Control)

Component Suppliers

SUPPLIER

COMPONENT

PHONE

WEBSITE

Diodes, Inc.

Schottky Diode

805-440-4800

www.diodes.com

Nichia

LEDs

717-285-2323

www.nichia.com

Panasonic

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

Note: Indicate that you are using the MAX1583 when contacting these suppliers.