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LT3754
APPLICATIONS INFORMATION
1 ?
?
? V IN
V IN
L =
0.5 ? OUT ? I LEDx ? 16
(1 ?
) ?
? 12V
3.2 10 6
INTV CC RegulatorBypassingandOperation
The INTV CC pin is the output of an internal linear regula-
tor driven from V IN and is the supply for the LT3754 gate
driver. The INTV CC pin should be bypassed with a 10V
rated 4.7μF low ESR, X7R or X5R ceramic capacitor to
ensure stability and to provide enough charge for the gate
driver. For high enough V IN levels the INTV CC pin provides
a regulated 7V supply. Make sure INTV CC voltage does
not exceed the V GS rating of the external MOSFET driven
by the GATE pin. For low V IN levels the INTV CC level will
depend on V IN and the voltage drop of the regulator. The
INTV CC regulator has an undervoltage lockout which
prevents gate driver switching until INTV CC reaches 3.8V
and maintains switching until INTV CC falls below 3.4V.
This feature prevents excessive power dissipation in the
external MOSFET by ensuring a minimum gate drive level
to keep R DS(ON) low. The INTV CC regulator has a current
limit of 44mA to limit power dissipation inside the I.C.
This current limit should be considered when choosing the
N-channel power MOSFET and the switching frequency.
The average current load on the INTV CC pin due to the
LT3754 gate driver can be calculated as:
I INTVCC = Q g ? f OSC
where Q g is the gate charge (at V GS = INTV CC ) specified
for the MOSFET and f OSC is the switching frequency of the
LT3754 boost converter. It is possible to drive the INTV CC
pin from a variety of external sources in order to remove
power dissipation from the LT3754 and/or to remove the
INTV CC current limitation of 44mA. An external supply for
INTV CC should never exceed the V IN pin voltage or the
maximum INTV CC pin rating of 13V. If INTV CC is shorted
to the V IN pin, V IN operational range is 4.5V to 13V.
Inductor
A list of inductor manufacturers is given in Table 1. How-
ever, there are many other manufacturers and inductors
that can be used. Consult each manufacturer for more
detailed information and their entire range of parts. Ferrite
cores should be used to obtain the best efficiency. Choose
an inductor that can handle the necessary peak current
without saturating. Also ensure that the inductor has a
low DCR (copper-wire resistance) to minimize I 2 R power
losses. Values between 2.2μH and 33μH will suffice for
most applications. The typical inductor value required for
a given application (assuming 50% inductor ripple current
for example) can be calculated as:
1 1
V OUT f OSC
V
V IN
where:
V OUT = (N ? V F ) + 1V
(N = number of LEDs per string),
V F = LED forward voltage drop,
I LEDx = LED current per string
Example: For a 12W LED driver application requiring 16
strings of 10 LEDs each driven with 20mA, and choosing
V IN = 12V, V OUT = (3.75V ? 10) + 1V = 38.5V, I LEDx = 20mA
and f OSC = 1MHz the value for L is calculated as
1 1
L = = 16.5μH
0.5 ? 3.2 ? 20mA ? 16
3754fc
11
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