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参数资料
| 型号： | CAT4003BTD-GT3 |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR 3CH TSOT23-6 |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO） |
| 输出数： | 3 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 电源电压： | 2.4 V ~ 5.5 V |
| 输出电压： | 6V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | TSOT-23-6 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | CAT4003BTD-GT3OSDKR |
CAT4003B, CAT4004B
Pin Functions
VIN is the supply pin for the charge pump. A small 1 m F
ceramic bypass capacitor is required between the VIN pin
and ground near the device. The operating input voltage
range is from 2.4 V to 5.5 V. Whenever the input supply falls
below the under ? voltage threshold (2.0 V), all the LED
channels are disabled and the device enters shutdown mode.
EN/DIM is the enable and one wire dimming input for all
LED channels. Levels of logic high and logic low are set at
1.3 V and 0.4 V respectively. When EN/DIM is initially
taken high, the CAT400XB becomes enabled and all LED
currents are set to the full scale 25 mA. To place the device
V IN
into “zero current” shutdown mode, the EN/DIM pin must
be held low for 3 ms typical
LED1 to LED4 provide the internal regulated current for
each of the LED cathodes. The pins enter a high impedance
zero current state whenever the device is placed in shutdown
mode.
GND is the ground reference for the device. The pin must be
connected to the ground plane on the PCB.
TAB (CAT4004B only) is the exposed pad underneath the
package. For best thermal performance, the tab should be
soldered to the PCB and connected to the ground plane.
VIN
Undervoltage
Lockout
Reference
Voltage
Current
Setting DAC
EN/DIM
Serial
Interface
Register
4 Current Sink
Regulators
200 k Ω
GND
Figure 12. CAT4004B Functional Block Diagram
LED current [mA] + 25
Basic Operation
The CAT400XB uses tightly matched current sinks to
accurately regulate LED current in each channel.
There are 32 different settings for LED brightness that can
be programmed through the EN/DIM pin. Tight current
regulation for all channels is possible over a wide range of
input and LED voltages due to independent current sensing
circuitry on each channel.
Each LED channel needs a minimum of 75 mV headroom
to sink a constant regulated current of 20 mA. If the input
supply falls below 2.0 V, the under ? voltage lockout circuit
disables all LED channels and resets the circuit to default
values. Any unused LED channels should be left open.
CAT400XB LED Current Selection
After power ? up and once enabled, the LED current is set
initially to the full scale currrent of 25 mA. The number of
pulses (n) on the EN/DIM input does decrease the current
value as follows:
31 * n
31
The full scale current is calculated from the above formula
with n equal to zero.
The EN/DIM pin has two primary functions. One function
enables and disables the device. The other function is LED
current dimming with 32 different levels by pulsing the input
signal, as shown on Figure 1. On each successive pulse
rising edge, the LED current is decreased by about 3.2%
(1/31st of the full scale value). After 30 pulses, the LED
current is 3.2% of the full scale current. On the 31 st pulse, the
current drops to zero, and then goes back to full scale on the
following pulse.
Initially once the EN/DIM input is first pulled high, it
must remain high for at least T SETUP delay (10 m s minimum)
to allow the LED driver to complete its power ? up. After this
delay, EN/DIM can be pulsed in order to set the LED current
to the desired level. Each pulse width should be between
1 m s and 500 m s. Pulses faster than the minimum T LO may
be ignored and filtered by the device. Pulses longer than the
maximum T LO may shutdown the device. By pulsing the
EN/DIM signal at a high frequency, the LED current can
quickly be set to zero or to any other level.
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT4004 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:4-Channel Constant Current LED Driver with EZDim⑩ |
| CAT4004_08 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:4-Channel Constant Current LED Driver with EZDim⑩ |
| CAT4004A | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Constant Current LED Driver with 32 Dimming Levels and Rset |
| CAT4004AHU2-GT3 | 功能描述:LED照明驱动器 LED DR 4 CH EZ DIM I/F 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 |
| CAT4004AHU2-GT3B | 功能描述:LED照明驱动器 322.4V to 5.5V 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 |
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