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| 型号： | AP5724WG-7 |
| 厂商： | Diodes Inc |
| 文件页数： | 8/15页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT SOT26-6 |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz ~ 1.4MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 26V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-26 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1138 (CN2011-ZH PDF) |
| 其它名称： | AP5724WG-7DIDKR |
AP5724
Applications Information
Inductor Selection
A 10 μ H to 22 μ H inductor is recommended for most AP5724 applications. For high efficiency the inductor should have low core losses at 1.2MHz
and low DCR (copper wire resistance). The inductor saturation current rating should also exceed the peak input current, especially for high load
current applications (like 3S8P).
Capacitor Selection
The small size of the ceramic capacitors are ideal for AP5724 applications. X5R and X7R types are recommended because they retain their
capacitance over wider voltage and temperature ranges than other types such as Y5V or Z5U. A 1 μ F input capacitor and a 1 μ F output capacitor
are sufficient for most AP5724 applications. For high output current applications like 3S8P, larger output capacitor of 2.2μF to 4.7μF is
recommended to minimize output ripple.
Diode Selection
Schottky diodes, with their low forward voltage drop and fast reverse recovery, are the ideal choices for AP5724 applications. The forward voltage
drop of a Schottky diode represents the conduction losses in the diode, while the diode capacitance (C T or C D ) represents the switching losses.
For diode selection, both forward voltage drop and diode capacitance need to be considered. Schottky diodes with higher current ratings usually
have lower forward voltage drop and larger diode capacitance, which can cause significant switching losses at the 1.2MHz switching frequency of
the AP5724. Schottky diodes with higher current ratings usually have lower forward voltage drop and larger diode capacitance. Larger Schottky
diode capacitance can cause significant switching losses at the 1.2MHz switching frequency of the AP5724. A Schottky diode rated at 100mA to
200mA is sufficient for most AP5724 applications.
LED Current Control
The LED current is controlled by the feedback resistor (R SET in Figure 1 ). The feedback reference is 0.1V. The LED current is 0.1V/ R SET . In order
to have accurate LED current, precision resistors are preferred (1% is recommended). The formula and table for R SET selection are shown below.
R SET = 0.1V/I LED (See Table 1 )
Table 1. R SET Resistor Value Selection
I LED (mA)
5
10
15
20
30
40
R SET ( ? )
20
10
6.6
5
3.3
2.5
Open-Circuit Protection
In the cases of output open circuit, when the LEDs are disconnected from the circuit or the LEDs fail, the feedback voltage will be zero. The AP5724
will then switch at a high duty cycle resulting in a high output voltage, which may cause the SW and OVP pin voltage to exceed the voltage rating of
these pins. The OVP pin monitors the output voltage. If the output voltage reaches the over voltage protection threshold at the OVP pin ( Figure 2 ),
the over voltage protection is activated and SW pin stops switching.
V IN
C IN
1uF
L1
22uH
D1
C OUT
1uF
FB
V IN SW
AP5724 OVP
EN
GND
x
x
R SET
5
Figure 2 LED Driver with Open-Circuit Protection
AP5724
Document number: DS31843 Rev. 4 - 2
8 of 15
www.diodes.com
December 2013
? Diodes Incorporated
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PDF描述 |
|---|---|
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| AP8800AWT-7 | IC LED DRIVER TSOT23-5 |
| AP8800FNG-7 | IC LED DRIVER HIGH BRIGHT 10DFN |
| AP8801M8G-13 | IC LED DRIVER HIGH BRIGHT 8MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AP5724WUG-7 | 功能描述:开关变换器、稳压器与控制器 WH LED STEP-UP DC/DC CONV 2-6 LED RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| AP5725 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:WHITE LED STEP-UP CONVERTER |
| AP5725_10 | 制造商:DIODES 制造商全称:Diodes Incorporated 功能描述:WHITE LED STEP-UP CONVERTER |
| AP5725FDCG-7 | 功能描述:开关变换器、稳压器与控制器 WH LED STEP-UP DC/DC CONV 2-6 LED RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| AP5725WG-7 | 功能描述:开关变换器、稳压器与控制器 WH LED STEP-UP DC/DC CONV 2-6 LED RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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