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參數(shù)資料
| 型號： | L6566A |
| 廠商： | 意法半導體 |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Multi-mode controller for SMPS with PFC front-end |
| 中文描述： | 多模式開關電源控制器，PFC前端 |
| 文件頁數(shù)： | 29/51頁 |
| 文件大?。?/td> | 410K |
| 代理商： | L6566A |
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L6566A
Application information
29/51
Equation 7
The converter is then tested on the bench to find the output power level Pout
lim
where
regulation is lost (because overcurrent is being tripped) both at Vin = Vin
min
and
Vin = Vin
max
.
If Pout
lim
@ Vin
max
> Pout
lim
@ Vin
min
the system is still undercompensated and k needs
increasing; if Pout
lim
@ Vin
max
< Pout
lim
@ Vin
min
the system is overcompensated and k
needs decreasing. This will go on until the difference between the two values is acceptably
low. Once found the true k
opt
in this way, it is possible that Pout
lim
turns out slightly different
from the target; to correct this, the sense resistor Rs needs adjusting and the above tuning
process will be repeated with the new Rs value. Typically a satisfactory setting is achieved in
no more than a couple of iterations.
In applications where this function is not wanted, e.g. because the PFC stage regulates at a
fixed voltage, the VFF pin can be simply grounded, directly or through a resistor (see
“
Chapter 5.11: OVP block on page 35
”). The overcurrent setpoint will be then fixed at the
maximum value of 1V. If a lower setpoint is desired to reduce the power dissipation on Rs,
the pin can be also biased at a fixed voltage using a divider from VREF (pin 10).
If the FF option is selected the Line Feedforward function can be still used to compensate for
the total propagation delay Td of the current sense chain (internal propagation delay td
(H-L)
plus the turn-off delay of the external MOSFET), which in standard current mode PWM
controllers is done by adding an offset on the current sense pin proportional to the input
voltage. In that case the divider ratio k, which will be much smaller as compared to that used
with the QR option selected, can be calculated with the following equation:
Equation 8
max
PKp
I
min
in
opt
3
V
k
1
Rs
=
Figure 17. Left: Overcurrent setpoint vs. VFF voltage; right: Line Feedforward function block
V
csx
[V]
1.2
0
0.5
1
1.5
2
2.5
3
3.5
0
0.2
0.4
0.6
0.8
1
V
VFF
[V]
V
COMP
= Upper clamp
7
9
15
Rs
PFC Output Bus
DRIVER
4
R
S
Q
R1B
R2
COMP
VFF
CS
GD
L6566A
1.5 V
-
Hiccup
DISABLE
VOLTAGE
FEED
FORWARD
To PFC's OV
sensing
Optional for
OVP settings
OCP
-
+
PWM
-
+
Vcsx
Clock/ZCD
R1A
Lp
Rs
Td
3
k
opt
=
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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 |
相關代理商/技術參數(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 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6566B | 功能描述:開關變換器、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 開關頻率:1 MHz 工作溫度范圍: 安裝風格: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 |
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