CAT3643HV3-T2 datasheet(10/17 Pages) CATALYST

Part #	CAT3643HV3-T2

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

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Manufacturer	CATALYST [Catalyst Semiconductor]

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

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10 / 17 page

CAT3643

Doc. No. 5022 Rev. B

10

Characteristics subject to change without notice

BLOCK DIAGRAM

Figure 2. CAT3643 Functional Block Diagram

BASIC OPERATION

At power-up, the CAT3643 starts operating in 1x

mode where the output will be approximately equal

to the input supply voltage (less any internal voltage

losses). If the output voltage is sufficient to regulate

all LED currents, the device remains in 1x operating

mode.

If the input voltage is insufficient or falls to a level

where the regulated currents cannot be maintained,

the device automatically switches into 1.33x mode

(after a fixed delay time of about 400μs). In 1.33x

mode, the output voltage is approximately equal to

1.33 times the input supply voltage (less any internal

voltage losses).

The above sequence repeats in the 1.33x and 1.5x

mode until the driver enters the 2x mode. In 1.5x mode,

the output voltage is approximately equal to 1.5 times

the input supply voltage. While in 2x mode, the output is

approximately equal to 2 times the input supply voltage.

If the device detects a sufficient input voltage is present

to drive all LED currents in 1x mode, it will change

automatically back to 1x mode. This only applies for

changing back to the 1x mode. The difference between

the input voltage when exiting 1x mode and returning to

1x mode is called the 1x mode transition hysteresis

(VHYS) and is about 500mV.

Mode Control

1, 1.3MHz

Oscillator

1x mode (LDO)

1.33x, 1.5x, 2x Charge Pump

VIN

C1-

C2-

C1+

C2+

VOUT

GND

LED1

LED2

LED3

LED Channel

Current Regulators

Current

Setting DAC

Serial

Interface

Registers

Referece

Voltage

EN/DIM

RSET

100kΩ

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CAT3643HV3-T2 Datasheet(PDF) 10 Page - Catalyst Semiconductor

CAT3643HV3-T2 Datasheet(HTML) 10 Page - Catalyst Semiconductor

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