ACT6360
Rev 1, 14-Feb-11
Capacitor Selection
The ACT6360 requires only a tiny 0.47µF output
capacitor for most applications. For circuits driving 6
or fewer LEDs, a 4.7µF input capacitor is generally
suitable. For circuits driving more than 6 LEDs, a
10µF input capacitor may be required.
When choosing a larger inductor which results in
CCM operation, stability and ripple can be improved
by adding a small feed forward capacitor from OUT
to FB. About 3000pF is a good starting point for
most applications, although a larger value can be
used to achieve best results in applications with 6
or fewer LEDs.
Ceramic capacitors are recommended for most ap-
plications. For best performance, use X5R and X7R
type ceramic capacitors, which possess less degra-
dation in capacitance over voltage and temperature.
Diode Selection
The ACT6360 requires a Schottky diode as the rec-
tifier. Select a low forward voltage drop Schottky
diode with forward current (I
F
) rating that exceeds
the peak current limit 1A and a peak repetitive re-
verse voltage (V
RRM
) rating that exceeds the maxi-
mum output voltage, typically set by the OV thresh-
old.
Shutdown
The ACT6360 features a low-current shutdown
mode. In shutdown mode, the control circuitry is
disabled and the quiescent supply current drops to
less than 1µA. To disable the IC, simply drive EN to
a logic low. To enable the ICs, drive EN to a logic
high or connect it to the input supply.
Low Input Voltage Applications
In applications that have low input voltage range,
such as those powered from 2-3 AA cells, the
ACT6360 may still be used if there is a suitable sys-
tem supply (such as 3.3V) available to power the
controller. In such an application, the inductor may
be connected directly to the battery, while the IC
power is supplied by the system supply.
Innovative Power
TM
-6-
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