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CAT4004 Datasheet(PDF) 3 Page - Catalyst Semiconductor

Part No. CAT4004
Description  4-Channel Constant Current LED Driver with EZDi TM
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Maker  CATALYST [Catalyst Semiconductor]
Homepage  http://www.catalyst-semiconductor.com
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CAT4004 Datasheet(HTML) 3 Page - Catalyst Semiconductor

 
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CAT4004
© 2007 Catalyst Semiconductor, Inc.
3
Doc. No. 5024 Rev. A
Characteristics subject to change without notice
SET
R
V
6
.
0
132
×
RECOMMENDED EN/DIM TIMING
For 2.4
≤ VIN ≤ 5.5V, over full ambient temperature range -40ºC to +85ºC.
Symbol
Name
Conditions
Min
Typ
Max
Units
TSETUP
EN/DIM setup from shutdown
10
μs
TLO
EN/DIM program low time
0.2
100
μs
THI
EN/DIM program high time
0.2
μs
TPWRDWN
EN/DIM low time to shutdown
1.5
ms
TLED
LED current settling time
40
μs
Figure 1. EN/DIM Dimming Timing Diagram
EN/DIM
number of pulses *
RSET Gain
LED Current
LOW
Shutdown mode
Zero
Transitions HIGH
132
132 x 0.6V/RSET
1
st
66
66 x 0.6V/RSET
2
nd
33
33 x 0.6V/RSET
3
rd
16.5
16.5 x 0.6V/RSET
4
th
8.25
8.25 x 0.6V/RSET
5
th
4.125
4.125 x 0.6V/RSET
6
th
132
132 x 0.6V/RSET
x
th
Device will keep cycling through gain selection
GAIN x 0.6V/RSET
* The gain is changed on the rising edges of the EN/DIM input.
LED CURRENT SELECTION
At power-up, the initial LED current is set to full scale
(100% brightness) by the external resistor RSET as
follows:
LED current =
The EN/DIM pin has two primary functions. One
function enables and disables the device. The other
function is LED current dimming with six different
levels by pulsing the input signal, as shown on Figure 3.
On each consecutive pulse rising edge, the LED current
is divided by half to 50%, then 25%, 12.5%, 6.25% and
3.125% dimming levels. Pulses faster than the mini-
mum TLO may be ignored and filtered by the device.
Pulses longer than the maximum TLO may shutdown the
device.
The LED driver enters a “zero current” shutdown mode
if EN/DIM is held low for 1.5ms or more.
EN/DIM
LED
Current
Shutdown
TSETUP
THI
TPWRDWN
Shutdown
TLO
TLED
100%
50%
25%
12.5% 6.25% 3.12%
100%


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