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参数资料
| 型号： | L6566A |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 0.8 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, SOP-16 |
| 文件页数： | 9/51页 |
| 文件大小： | 646K |
| 代理商： | L6566A |
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L6566A
Application information
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5
Application information
The L6566A is a versatile peak-current-mode PWM controller specific for offline flyback
converters. The device allows either fixed-frequency (FF) or quasi-resonant (QR) operation,
selectable with the pin MODE/SC (12): forcing the voltage on the pin over 3 V (e.g. by tying
it to the 5 V reference externally available at pin VREF, 10) will activate QR operation,
otherwise the device will be FF-operated.
Irrespective of the operating option selected by pin 12, the device is able to work in different
modes, depending on the converter's load conditions. If QR operation is selected (see
1.
QR mode at heavy load. Quasi-resonant operation lies in synchronizing MOSFET's
turn-on to the transformer's demagnetization by detecting the resulting negative-going
edge of the voltage across any winding of the transformer. Then the system works
close to the boundary between discontinuous (DCM) and continuous conduction
(CCM) of the transformer. As a result, the switching frequency will be different for
different line/load conditions (see the hyperbolic-like portion of the curves in Figure 4).
Minimum turn-on losses, low EMI emission and safe behavior in short circuit are the
main benefits of this kind of operation.
2.
Valley-skipping mode at medium/ light load. The externally programmable oscillator of
the L6566A, synchronized to MOSFET's turn-on, enables the designer to define the
maximum operating frequency of the converter. As the load is reduced MOSFET's turn-
on will not any more occur on the first valley but on the second one, the third one and
so on. In this way the switching frequency will no longer increase (piecewise linear
portion in Figure 4).
3.
Burst-mode with no or very light load. When the load is extremely light or disconnected,
the converter will enter a controlled on/off operation with constant peak current.
Decreasing the load will then result in frequency reduction, which can go down even to
few hundred hertz, thus minimizing all frequency-related losses and making it easier to
comply with energy saving regulations or recommendations. Being the peak current
very low, no issue of audible noise arises.
Figure 4.
Multi-mode operation with QR option active
0
fsw
Pinmax
Input voltage
Pin
fosc
Burst-mode
Valley-skipping
mode
Quasi-resonant mode
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6566A_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Multi-mode controller for SMPS with PFC front-end |
| L6566ATR | 功能描述:开关变换器、稳压器与控制器 Multi Mode PWM Controller 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 |
| L6566B | 功能描述:开关变换器、稳压器与控制器 Multi Mode PWM Controller 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 |
| L6566B_08 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Multi-mode controller for SMPS |
| L6566BH | 功能描述:电流型 PWM 控制器 Multimode Controller SMPS 800V <3mA RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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