- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383237 > L6566A (意法半導(dǎo)體) Multi-mode controller for SMPS with PFC front-end PDF資料下載
參數(shù)資料
| 型號(hào)： | L6566A |
| 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)： | 27/51頁 |
| 文件大?。?/td> | 410K |
| 代理商： | L6566A |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁當(dāng)前第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁
L6566A
Application information
27/51
Figure 15. Externally controlled burst-mode operation by driving pin COMP: timing
diagram
5.6
PWM comparator, PWM latch and voltage feedforward blocks
The PWM comparator senses the voltage across the current sense resistor Rs and, by
comparing it to the programming signal delivered by the feedforward block, determines the
exact time when the external MOSFET is to be switched off. Its output resets the PWM
latch, previously set by the oscillator or the ZCD triggering block, which will assert the gate
driver output low. The use of PWM latch avoids spurious switching of the MOSFET that
might result from the noise generated ("double-pulse suppression").
Cycle-by-cycle current limitation is realized with a second comparator (OCP comparator)
that senses the voltage across the current sense resistor Rs as well and compares this
voltage to a reference value V
CSX
. Its output is or-ed with that of the PWM comparator (see
the circuit schematic in
Figure 17 on page 29
). In this way, if the programming signal
delivered by the feedforward block and sent to the PWM comparator exceeds V
CSX
, it will be
the OCP comparator to reset first the PWM latch instead of the PWM comparator. The value
of Vcsx, thereby, determines the overcurrent setpoint along with the sense resistor Rs.
The power that QR flyback converters with a fixed overcurrent setpoint (like fixed-frequency
systems) are able to deliver changes with the input voltage considerably. Obviously, this is
not a problem if the flyback converter runs off a fixed voltage bus generated by the PFC pre-
regulator; however, with a tracking boost PFC (a "boost follower" PFC), the regulated output
voltage at maximum mains voltage can be even twice the value at minimum mains voltage.
In this case the issue is still there, although not as big as without PFC and wide-range
mains. With a 1:2 voltage change, the maximum transferable power at maximum line can be
50% higher than at minimum line, as shown by the upper curve in the diagram of
Figure 16
.
The L6566A has the Line Feedforward function available to solve this issue.
Vcc
(pin 5)
Vcc
ON
GD
(pin 4)
Vcc_OK
Vcc
OFF
Vcc
restart
I
charge
0.85 mA
Standby is commanded here
t
t
t
t
t
Vcc_PFC
(pin 6)
t
COMP
(pin 9)
t
Vout
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6566ATR | Multi-mode controller for SMPS with PFC front-end |
| L6566B | Multi-mode controller for SMPS |
| L6566BTR | Multi-mode controller for SMPS |
| L6567 | HIGH VOLTAGE DRIVER FOR CFL |
| L6567D | HIGH VOLTAGE DRIVER FOR CFL |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6566A_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Multi-mode controller for SMPS with PFC front-end |
| L6566ATR | 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 | 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(shí)間: 下降時(shí)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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。