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CAT4109, CAV4109
Output Enable
SHUTDOWN
t P2
t HI
t LO
t F
t PWRDWN
SHUTDOWN 0 mA
t PS
t P1
t R
I LED = (1.2 V/R SET ) x 400
LED Current
SHUTDOWN 0 mA
5 0%
5 0%
9 0 %
1 0%
0 mA
VIN Quiescent Current
SHUTDOWN 0 mA
OE Operation
Figure 2. CAT4109/CAV4109 OE Timing
SHUTDOWN 0 mA
The Output Enable (OE) pin has two primary functions.
When the OE input goes from high to low, all three LED
channels are turned off. If OE remains low for longer than
t PWRDWN , the device enters shutdown mode drawing “zero
current” from the supply.
The OE input can be used to adjust the contrast of the RGB
LED by applying an external PWM signal. The device has
a very fast turn ? on time (from OE rising to LED on)
allowing “instant on” when dimming LEDs.
When applying PWM signals to the three PWMx inputs
and using the OE pin for dimming, the OE PWM frequency
should be much lower to preserve the color mixing.
Accurate linear dimming on OE is compatible with PWM
frequencies from 100 Hz to 5 kHz for PWM duty cycle
down to 1%. PWM frequencies up to 50 kHz can be
supported for duty cycles greater than 10%.
When performing a combination of low frequencies and
small duty cycles, the device may enter shutdown mode.
This has no effect on the dimming accuracy, because the
turn ? on time t PS is very short, in the range of 1 m s.
To ensure that PWM pulses are recognized, pulse width
low time t LO should be longer than 1 m s. The driver enters
a “zero current” shutdown mode after a 4 ms delay (typical)
when OE is held low.
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