CAT4101TV-T75 CATALYST SEMICONDUCTOR, CAT4101TV-T75 Datasheet - Page 3

• Manufacturer Part Number: CAT4101TV-T75
• Description: IC, LED DRIVER, CONSTANT CURRENT, TO263-5
• Manufacturer: CATALYST SEMICONDUCTOR

Specifications of CAT4101TV-T75

• Led Driver Application: Architectural, Automotive Lighting
• No. Of Outputs: 1
• Output Current: 1A
• Output Voltage: 3.5V
• Input Voltage: 3V To 5.5V
• Topology: Constant Current
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

EN/PWM Operation
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.
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%.
EN/PWM
LED CURRENT
VIN QUIESCENT CURRENT
Table 4. RECOMMENDED EN/PWM TIMING
(For 3.0 V ≤ VIN ≤ 5.5 V, over full ambient temperature range −40°C to +85°C.)
T
The EN/PWM pin has two primary functions. One
Accurate linear dimming is compatible with PWM
Symbol
PWRDWN
T
T
T
T
T
T
T
PS
LO
P1
P2
HI
R
F
SHUTDOWN 0 mA
SHUTDOWN 0 mA
Turn−On time, EN/PWM rising to I
Shutdown
Turn−On time, EN/PWM rising to I
Turn−Off time, EN/PWM falling to I
LED rise time
LED fall time
EN/PWM low time
EN/PWM high time
EN/PWM low time to shutdown delay
SHUTDOWN
T
PS
T
P2
Name
50%
Figure 2. CAT4101 EN/PWM Timing
LED
LED
LED
T
HI
50%
T
from
P1
T
http://onsemi.com
LO
I
I
I
I
I
T
LED
LED
LED
LED
LED
Conditions
R
I
I
I
I
I
LED
LED
LED
LED
LED
10%
90%
3
= 350 mA
= 350 mA
= 350 mA
= 350 mA
= 350 mA
= 1 A
= 1 A
= 1 A
= 1 A
= 1 A
T
small duty cycles, the device may enter shutdown mode.
This has no effect on the dimming accuracy, because the
turn−on time T
low time T
enters a “zero current” shutdown mode after a 5 ms delay
(typical) when EN/PWM is held low.
F
When performing a combination of low frequencies and
To ensure that PWM pulses are recognized, pulse width
I
LED
LO
Min
= (1.2 V / R
1
5
should be longer than 1 ms. The CAT4101
PS
is very short, in the range of 1 ms.
SET
Typ
920
620
440
310
840
390
470
350
1.6
1.1
) x 400
0 mA
T
PWRDWN
Max
8
SHUTDOWN
SHUTDOWN
Units
ms
ms
ns
ns
ns
ns
ms
ms