CAT3643HL1-T2 datasheet(11/17 Pages) ONSEMI

Part #	CAT3643HL1-T2

Description	3-Channel Ultra High Efficiency Quad-Mode LED Driver

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Manufacturer	ONSEMI [ON Semiconductor]

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CAT3643

11

Doc. No. MD-5022 Rev. G

Characteristics subject to change without notice

SET

R

V

6

.

0

132

×

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 minimum 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.

Figure 3. EN/DIM Digital Dimming Timing Diagram

Table 1. LED Current Dimming Levels

EN/DIM

# of Pulses *

RSET Gain

LED Current

EN = High

132

SET

R

V

6

.

0

132

×

1

st

66

SET

R

V

6

.

0

66

×

2

nd

33

SET

R

V

6

.

0

33

×

3

rd

16.5

SET

R

V

6

.

0

5

.

16

×

4

th

8.25

SET

R

V

6

.

0

25

.

8

×

5

th

4.125

SET

R

V

6

.

0

125

.

4

×

6

th

132

SET

R

V

6

.

0

132

×

x

th

Device cycling through gain selection

SET

R

V

6

.

0

GAIN

×

* The gain is changed on the rising edges of the EN/DIM input.

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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CAT3643HL1-T2 Datasheet(PDF) 11 Page - ON Semiconductor

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