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參數(shù)資料
| 型號： | L6566ATR |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Multi-mode controller for SMPS with PFC front-end |
| 中文描述： | 多模式開關(guān)電源控制器，PFC前端 |
| 文件頁數(shù)： | 31/51頁 |
| 文件大?。?/td> | 410K |
| 代理商： | L6566ATR |
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L6566A
Application information
31/51
Figure 18. Hiccup-mode OCP: timing diagram
(pin 5)
Vcc
ON
5.8
PFC interface
The device is specifically designed to minimize converter’s losses under light or no-load
conditions, and a special function has been provided to help the designer meet energy
saving requirements even in power-factor-corrected systems where a PFC pre-regulator
precedes the isolated DC-DC converter.
Actually EMC regulations require compliance with low-frequency harmonic emission limits
at nominal load; no limit is envisaged when the converter operates with a light load. Then
the PFC pre-regulator can be turned off, thus saving the no-load consumption of this stage
(0.5
÷
1W).
To do so, the L6566A provides the Vcc_PFC pin (6): this pin is internally connected to the
Vcc pin (5) via a PNP transistor, normally closed, that opens when the voltage V
COMP
falls
below V
COMPO
, a threshold internally set at a value depending on whether QR operation or
FF operation is selected. This pin is intended for supplying the PFC controller of the pre-
regulator as shown in
Figure 16 on page 28
. The switch is thermally protected, so that the
IC will stop if an external failure causes the pin to be overloaded for too long time or shorted
to ground.
Vcc
GD
(pin 4)
OCP latch
Vcc
OFF
Vcc
restart
Secondary diode is shorted here
t
t
t
t
V
CS
(pin 7)
Vcc_OK
t
1.5 V
Vcc_PFC
(pin 6)
t
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6566B | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Multi Mode PWM Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| 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(guān)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(fēng)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(guān)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(fēng)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(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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