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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： | 22/51页 |
| 文件大小： | 646K |
| 代理商： | L6566A |
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L6566A
Application information
29/51
Experience shows that this value is typically lower than the real one. Once the maximum
peak primary current, IPKpmax, occurring at minimum input voltage Vinmin has been found,
the value of Rs can be determined from (2):
Equation 7
The converter is then tested on the bench to find the output power level Poutlim where
regulation is lost (because overcurrent is being tripped) both at Vin = Vinmin and
Vin = Vinmax.
If Poutlim @ Vinmax > Poutlim @ Vinmin the system is still undercompensated and k needs
increasing; if Poutlim @ Vinmax < Poutlim @ Vinmin 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 kopt in this way, it is possible that Poutlim 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, depending
on whether one wants the OVP function to be auto-restart or latched mode (see
“Chapter 5.11: OVP block on page 35”). The overcurrent setpoint will be then fixed at the
maximum value of 1 V. 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:
max
PKp
min
in
opt
I
V
3
k
1
Rs
=
Figure 17.
Left: overcurrent setpoint vs VFF voltage; right: line feedforward function block
Vcsx [V]
0
0.5
11.522.5
33.5
0
0.2
0.4
0.6
0.8
1
1.2
VVFF [V]
VCOMP= 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
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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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