CAT3643HV3-T2 datasheet(4/17 Pages) CATALYST

Part #	CAT3643HV3-T2

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

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Manufacturer	CATALYST [Catalyst Semiconductor]

Direct Link	http://www.catalyst-semiconductor.com

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CAT3643

Doc. No. MD-5022 Rev. E

4

Characteristics subject to change without notice

RECOMMENDED EN/DIM TIMING

For 2.4V

≤ 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 Digital Dimming Timing Diagram

LED Current Setting

The nominal LED current is set by the external

resistor connected between the RSET pin and

ground. Table 1 lists standard resistor values for

several LED current settings.

LED Current (mA)

RSET (kΩ)

2

40.0

5

15.8

10

7.87

15

5.23

20

4.02

25

3.16

30

2.67

Table 1. Resistor RSET and LED Current

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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CAT3643HV3-T2 Datasheet(PDF) 4 Page - Catalyst Semiconductor

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