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參數(shù)資料
| 型號： | L6566B |
| 廠商： | 意法半導體 |
| 英文描述： | Multi-mode controller for SMPS |
| 中文描述： | 多模式開關電源控制器 |
| 文件頁數(shù)： | 17/51頁 |
| 文件大小： | 401K |
| 代理商： | L6566B |
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L6566B
Application information
17/51
5
Application information
The L6566B 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 3V (e.g.
by tying it to the 5V 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
Figure 4
):
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 L6566B, 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
0
f
sw
Pinmax
Input voltage
P
in
f
osc
Burst-mode
Valley-skipping
mode
Quasi-resonant mode
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| L6566B_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multi-mode controller for SMPS |
| L6566BH | 功能描述:電流型 PWM 控制器 Multimode Controller SMPS 800V <3mA RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| L6566BHTR | 功能描述:電流型 PWM 控制器 MULTIMODE CONTROLLER SMPS 8V 3 mA RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| L6566BTR | 功能描述:電流型 PWM 控制器 MultiMode Controller for SMPS RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| L6566BTR-CUT TAPE | 制造商:ST 功能描述:L6566B Series 23 V 4.6 mA SMPS Multi-Mode Controller Surface Mount - SOIC-16N |
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