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| 型号： | AP3152FG-7 |
| 厂商： | Diodes Inc |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGHT 12-DFN |
| 产品变化通告： | End Of Life 10/June/2010 |
| 标准包装： | 3,000 |
| 拓扑： | PWM，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： | 1.2MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-UFDFN 裸露焊盘 |
| 供应商设备封装： | DFN3030-12 |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
AP3152
120mA HIGH EFFICIENCY WHITE LED DRIVER
Functional Description
Disabled Current Sinks
(Continued)
Thermal Shutdown
Unused current channels must be disabled by connecting the
sinks to V OUT with only a small sense current flowing through the
disabled channel.
Soft-Start and Soft-Stop
Soft-start and Soft-stop function are incorporated to prevent
excessive inrush current during power-up, mode switching,
power-down, transition out of stand-by mode.
Short-Circuit Protection
Short-circuit protection function is incorporated to prevent
excessive load current when either flying cap terminals or output
pin electrically tied to a very low voltage or ground.
Over-Voltage Protection
Over-voltage protection function is incorporated to limit the
output voltage under a safe value to avoid on-chip device
When the die temperature exceeds the thermal limit, the device
will be disabled and enter stand-by mode. The operation will be
resumed whenever the die cools off sufficiently.
Switching Frequency
By default, AP3152 is working at 1.2Mhz switching frequency. It
can also work at 0.6MHz or 1.8MHz switching frequency set
through SDI. User can choose the appropriate switching
frequency with consideration of noise immunity, input/output
voltage ripple requirement, and capacitor selection etc.
Up Spread Spectrum Control
When this feature is enabled through SDI, the switching
frequency periodically varies between 100% and 110% of
nominal frequency. It flattens the peak energy on nominal
frequency over a range of frequency band so that EMI effect is
significantly reduced.
breakdown.
PWM Dimming Control
Under-Voltage Lockout
Under-voltage lockout feature disables the device when the
input voltage drops below UVLO threshold.
The AP3152 provides flexible dimming control with either
16-level SDI protocol control or PWM dimming control through
SDI pin. When PWM dimming control is enabled, the sink
current is adjusted by the duty cycle of the signal applied on SDI
pin.
Serial Digital Interface Continued
SDI Command Timing
For an SDI command to be successfully received by the AP3152, all SDI timing specifications should be satisfied. When no command is
being sent the SDI pin should be held high. If the SDI pin goes low and stays low for a time length of between TSLO(min) and TSLO(max)
and then goes high and stays high for between TSHI(min) and TSHI(max), one falling edge is registered by the AP3152. The total
number of falling edges registered before the SDI pin is held high for longer than the maximum separation time TSEP(max) identifies the
command that has been received by the AP3152. The next series of falling edges before another separation time TSEP represents the
next command. In other words, the AP3152 counts the number of consecutive falling edges on the SDI pin and a different number
represents a different command.
Each command is executed after it is successfully received. If at any time the SDI pin is held low for longer than the maximum chip
disable time TOFF(max), the AP3152 gets disabled and enters the shutdown mode. Setting the SDI pin high again will re-enable the
AP3152 and bring it out of the shutdown mode. Exiting from the shutdown mode, the AP3152 will retain all latest configuration settings
and return to the same state as before it was disabled.
The AP3152 enters the SDI mode by default when it is first powered up. The first SDI command 63 (63 falling edges) will put the AP3152
into the PWM mode, where a high level on the SDI pin turns the LEDs on, a low level turns the LEDs off and the duty cycle determines
the average LED brightness. The next SDI command 63 will put the AP3152 back into the SDI mode. It should be pointed out that the
PWM mode is for dimming control only and configuration settings have to be done in the SDI mode.
Channel Configuration Example
The following timing diagram is a dimming control example. In this example, the first command (command 10) selects Channel 2 as the
configuration target and the second command (command 2) sets the Channel 2 current level to one step lower while the other channels
remain unchanged.
AP3152 Rev. 3
10 of 13
FEBRUARY 2009
www.diodes.com
?
Diodes Incorporated
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相关代理商/技术参数 |
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|---|---|
| AP3154 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:120mA HIGH EFFICIENCY WHITE LED DRIVER |
| AP3154A | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:Small LCD screen backlighting charge pump LED drivers |
| AP3154AFG-7 | 功能描述:LED照明驱动器 120mA High EFF WH 4 LED Driver 2.7-5.5 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 |
| AP3154FG-7 | 功能描述:LED照明驱动器 INTRFACE CHARGE PUMP 4CHAN 120mA 2.7-5.5V 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 |
| AP3156 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:HIGH EFFICIENCY 1X/1.5X/2X CHARGE PUMP FOR WHITE LED APPLICATIONS |
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