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参数资料
| 型号： | AP8803WTG-7 |
| 厂商： | Diodes Inc |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER CONN CURR TSOT23-5 |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 通用 |
| 频率： | 700kHz |
| 电源电压： | 8 V ~ 30 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 105°C |
| 产品目录页面： | 1138 (CN2011-ZH PDF) |
| 其它名称： | AP8803WTG-7DIDKR |
AP8803
Application Information (cont.)
PWM Dimming
A Pulse Width Modulated (PWM) signal with a max resolution of 8-bit, can be applied to the CTRL pin to change the output current to a value
above or below the nominal average value set by resistor R SET . To achieve this resolution the PWM frequency has to be lower than 500Hz.
Figure 5 shows the typical PWM response of the AP8800A. An internal filter produces a rump
Figure 5 Typical PWM Dimming Waveform
The recommended method of driving the CTRL pin and controlling the amplitude of the PWM waveform is to use a small NPN switching
transistor as shown below:
Figure 6 Open Collector PWM Dimming Circuit
This scheme uses the internal 200k Ω resistor between the CTRL pin and the internal voltage reference as a pull-up resistor for the external
transistor eg MMBT3904.
Soft-Start
An external capacitor from the CTRL pin to ground will provide soft-start delay, by increasing the time taken for the voltage on this pin to rise to
the turn-on threshold and by slowing down the rate of rise of the control voltage at the input of the comparator.
The soft-start time is 0.5ms/nF.
AP8803
Document number: DS31970 Rev. 5 - 2
7 of 10
www.diodes.com
August 2012
? Diodes Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AP8821 | 制造商:APLUS 制造商全称:APLUS 功能描述:21 sec VOICE OTP |
| AP8841 | 制造商:American Power Conversion Corp (APC by Schneider Electric) 功能描述:RACK PDU 2G, METERED, ZEROU, 30A, 200/208V, (36) C13 & (6) C19 制造商:Schneider Electric 功能描述:RACK PDU 2G, METERED, ZEROU, 30A 200/208V, (36) C13 & (6) C1 - Bulk |
| AP8842 | 制造商:APLUS 制造商全称:APLUS 功能描述:42 sec VOICE OTP |
| AP8853 | 制造商:Schneider Electric 功能描述:RACK PDU 2G, METERED, ZEROU, 32A, 230V, (36) C13 & (6) C19 - Bulk |
| AP8853-25PI | 制造商:ANSC 功能描述:AP8853-25PI 300MA 2.5V LDO LINEAR REGULATOR /OGI |
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