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CAT3643
Block Diagram
C 1 ?
C 1+
C 2 ?
C 2+
V IN
1x mode (LDO)
1.33x, 1.5x, 2x Charge Pump
Mode Control
V OUT
EN/DIM
100 k Ω
Serial
Interface
Registers
1, 1.3 MHz
Oscillator
Reference
Voltage
Current
Setting DAC
RSET
GND
LED1
LED2
LED3
LED Channel
Current Regulators
Figure 28. 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 400 m s). 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 (V HYS ) and
is about 500 mV.
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CAT3643HV3-GT2 功能描述:LED照明驱动器 LED Driver,Quad mode,3 ch RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
CAT3643HV3-T2 功能描述:LED照明驱动器 3-Channel Quad-Mode RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
CAT3644 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:4-Channel Ultra High Efficiency Quad-Mode⑩ LED Driver
CAT3644_0710 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:4-Channel Ultra High Efficiency Quad-Mode⑩ LED Driver
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