Datasheet > CAT3644

CAT3644

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
CATALYST		驱动器
页数	文件大小	规格书
14页	294K
描述
4-Channel Ultra High Efficiency Quad-Mode TM LED Driver

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CAT3644 数据手册

CAT3644

BLOCK DIAGRAM

OUT

1x mode (LDO)

4/3x, 3/2x, 2x Charge Pump

Mode Control

1, 1.3MHz

Oscillator

EN/DIM

LED1

LED2

LED3

LED4

100kꢀ

Serial

Referece

Voltage

Interface

LED Channel

Current Regulators

Current

Setting DAC

Registers

RSET

GND

Figure 2. CAT3644 Functional Block Diagram

BASIC OPERATION

At power-up, the CAT3644 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.

This 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

(V_HYS) and is about 500mV.

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).

Characteristics subject to change without notice

Doc. No. 5023, Rev. B

1...6 7 8910 11 12...14

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