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参数资料
| 型号： | CAT3644HV3-GT2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/13页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR 4CH QUAD MODE 16TQFN |
| 标准包装： | 2,000 |
| 系列： | QUAD-Mode® |
| 拓扑： | 线性（LDO），切换式电容器（充电泵） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 800kHz ~ 1.6MHz |
| 电源电压： | 2.5 V ~ 5.5 V |
| 输出电压： | 7V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN（3x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
CAT3644
Unused LED Channels
For applications not requiring all the channels, it is
recommended the unused LED pins be tied directly to V OUT
(see Figure 27).
LED Selection
LEDs with forward voltages (V F ) ranging from 1.3 V to
4.3 V may be used. Selecting LEDs with lower V F is
recommended in order to improve the efficiency by keeping
the driver in 1x mode longer as the battery voltage decreases.
V IN
C1+
V IN
1 m F
C1 ? C2+
1 m F
C2 ?
V OUT
For example, if a white LED with a V F of 3.3 V is selected
over one with V F of 3.5 V, the driver will stay in 1x mode for
lower supply voltage of 0.2 V. This helps improve the
efficiency and extends battery life.
C IN
1 m F
ENABLE
DIMMING
R SET
CAT3644
EN/DIM
RSET
GND
LED1
LED2
LED3
LED4
C OUT
1 m F
External Components
The driver requires four external 1 m F ceramic capacitors
for decoupling input, output, and for the charge pump. Both
capacitors type X5R and X7R are recommended for the
LED driver application. In all charge pump modes, the input
current ripple is kept very low by design and an input bypass
capacitor of 1 m F is sufficient.
In 1x mode, the device operates in linear mode and does
Figure 27. Application with 3 LEDs
Protection Mode
If an LED is disconnected, the driver senses that and
automatically ignores that channel. When all LEDs are
disconnected, the driver goes to 1x mode where the output
is equal to the input voltage.
As soon as the output exceeds about 6 V, the driver resets
itself and reevaluate the mode.
If the die temperature exceeds +150 ° C, the driver will
enter a thermal protection shutdown mode. When the device
temperature drops by about 20 ° C, the device will resume
normal operation.
Pin1
EN/DIM
not introduce switching noise back onto the supply.
Recommended Layout
In charge pump mode, the driver switches internally at a
high frequency. It is recommended to minimize trace length
to all four capacitors. A ground plane should cover the area
under the driver IC as well as the bypass capacitors. Short
connection to ground on capacitors C IN and C OUT can be
implemented with the use of multiple via. A copper area
matching the TQFN exposed pad (TAB) must be connected
to the ground plane underneath. The use of multiple via
improves the package heat dissipation.
GND
C2
C1
RSET
VIN
GND
COUT
CIN
GND
Figure 28. Recommended Layout
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| CAT3644HV3G-T2 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Catalyst Semiconductor 功能描述: |
| CAT3644HV3-T2 | 功能描述:LED照明驱动器 4 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 |
| CAT3647 | 制造商:CATALYST 制造商全称:Catalyst Semiconductor 功能描述:3-Channel Ultra High Efficiency Quad-Mode⑩ LED Driver with 32 Dimming Levels |
| CAT3647HV3-GT2 | 功能描述:LED照明驱动器 Ultra Hi Eff Quad LED Driver 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 |
| CAT3648 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:4-Channel Ultra High Efficiency Quad-Mode LED Driver with 32 Dimming Levels |
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