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LT1932
APPLICATIO S I FOR ATIO
Capacitor Selection
Low ESR (equivalent series resistance) capacitors should
be used at the output to minimize the output ripple
turned off (typically less than one-third the time), so a 0.4A
or 0.5A diode will be sufficient for most designs.
Table 3. Recommended Schottky Diodes
voltage. Because they have an extremely low ESR and are
available in very small packages, multilayer ceramic ca-
pacitors are an excellent choice. X5R and X7R type
capacitors are preferred because they retain their capaci-
tance over wider voltage and temperature ranges than
other types such as Y5V or Z5U. A 1 μ F or 2.2 μ F output
capacitor is sufficient for most applications. Always use a
PART
MBR0520
MBR0530
MBR0540
ZHCS400
ZHCS500
VENDOR
ON Semiconductor
(800) 282-9855
www.onsemi.com
Zetex
(631) 543-7100
www.zetex.com
R SET = 225 ? ?
? I LED ?
capacitorwithasufficientvoltagerating.Ceramiccapaci-
tors do not need to be derated (do not buy a capacitor with
a rating twice what your application needs). A 16V ce-
ramic capacitor is good to more than 16V, unlike a 16V
tantalum, which may be good to only 8V when used in
certain applications. Low profile ceramic capacitors with
a 1mm maximum thickness are available for designs
having strict height requirements.
Ceramic capacitors also make a good choice for the input
decoupling capacitor, which should be placed as close as
possible to the LT1932. A 2.2 μ F or 4.7 μ F input capacitor
is sufficient for most applications. Table 2 shows a list of
several ceramic capacitor manufacturers. Consult the
manufacturers for detailed information on their entire
selection of ceramic parts.
Programming LED Current
The LED current is programmed with a single resistor
connected to the R SET pin (see Figure 1). The R SET pin is
internally regulated to 100mV, which sets the current
flowing out of this pin, I SET , equal to 100mV/R SET . The
LT1932 regulates the current into the LED pin, I LED , to 225
times the value of I SET . For the best accuracy, a 1% (or
better) resistor value should be used. Table 4 shows
several typical 1% R SET values. For other LED current
values, use the following equation to choose R SET .
? 0 . 1 V ?
?
Table 4. R SET Resistor Values
Table 2. Recommended Ceramic Capacitor Manufacturers
I LED (mA)
R SET VALUE
VENDOR
Taiyo Yuden
Murata
Kemet
PHONE
(408) 573-4150
(814) 237-1431
(408) 986-0424
URL
www.t-yuden.com
www.murata.com
www.kemet.com
40
30
20
15
562 ?
750 ?
1.13k
1.50k
10
2.26k
Diode Selection
5
4.53k
Schottky diodes, with their low forward voltage drop and
fast switching speed, are the ideal choice for LT1932
applications. Table 3 shows several different Schottky
diodes that work well with the LT1932. Make sure that the
diode has a voltage rating greater than the output voltage.
The diode conducts current only when the power switch is
Most white LEDs are driven at maximum currents of 15mA
to 20mA. Some higher power designs will use two parallel
strings of LEDs for greater light output, resulting in 30mA
to 40mA (two strings of 15mA to 20mA) flowing into the
LED pin.
1932f
6
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