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CAT4101
Table 4. RECOMMENDED EN/PWM TIMING
(For 3.0 V ≤ V IN ≤ 5.5 V, over full ambient temperature range ? 40 ° C to +85 ° C.)
Symbol
T PS
T P1
Name
Turn ? On time, EN/PWM rising to I LED from
Shutdown
Turn ? On time, EN/PWM rising to I LED
Conditions
I LED = 1 A
I LED = 350 mA
I LED = 1 A
Min
Typ
1.6
1.1
920
Max
Units
m s
ns
I LED = 350 mA
620
T P2
Turn ? Off time, EN/PWM falling to I LED
I LED = 1 A
440
ns
I LED = 350 mA
310
T R
LED rise time
I LED = 1 A
840
ns
I LED = 350 mA
390
T F
LED fall time
I LED = 1 A
470
ns
I LED = 350 mA
350
T LO
T HI
T PWRDWN
EN/PWM low time
EN/PWM high time
EN/PWM low time to shutdown delay
T HI
1
5
8
T PWRDWN
m s
m s
ms
T LO
EN/PWM
SHUTDOWN
T P2
T F
SHUTDOWN
T PS
T P1
T R
I LED = (1.2 V / R SET ) x 400
LED CURRENT
50%
50%
90%
SHUTDOWN 0 mA
VIN QUIESCENT CURRENT
SHUTDOWN 0 mA
10%
0 mA
SHUTDOWN
Figure 2. CAT4101 EN/PWM Timing
EN/PWM Operation
The EN/PWM pin has two primary functions. One
function enables and disables the device. The other function
turns the LED channel on and off for PWM dimming
control. The device has a very fast turn ? on time (from
EN/PWM rising to LED on) and allows “instant on” when
dimming LED using a PWM signal.
Accurate linear dimming is compatible with PWM
frequencies from 100 Hz to 5 kHz for PWM duty cycle
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 CAT4101
enters a “zero current” shutdown mode after a 5 ms delay
(typical) when EN/PWM is held low.
down to 1%. PWM frequencies up to 50 kHz can be
supported for duty cycles greater than 10%.
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