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參數資料
| 型號： | L6566ATR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩壓器 |
| 英文描述： | 0.8 A POWER FACTOR CONTROLLER WITH POST REGULATOR, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | LEAD FREE, SOP-16 |
| 文件頁數： | 21/51頁 |
| 文件大小： | 646K |
| 代理商： | L6566ATR |
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Application information
L6566A
28/51
Figure 16.
Typical power capability change vs input voltage in QR flyback
converters
It acts on the overcurrent setpoint Vcsx, so that it is a function of the converter’s input voltage
Vin (output of the PFC pre-regulator) sensed through a dedicated pin (15, VFF): the higher
the input voltage, the lower the setpoint. This is illustrated in the diagram on the left-hand
side of Figure 17 on page 29: it shows the relationship between the voltage on the pin VFF
and Vcsx (with the error amplifier saturated high in the attempt of keeping output voltage
regulation):
Equation 5
Note:
If the voltage on the pin exceeds 3 V switching ceases but the soft-start capacitor is not
discharged. The schematic in Figure 17 on page 29 shows also how the function is included
in the control loop.
With a proper selection of the external divider R1-R2, i.e. of the ratio k = R2 / (R1+R2), it is
possible to achieve the optimum compensation described by the lower curve in the diagram
of Figure 16.
The optimum value of k, kopt, which minimizes the power capability variation over the input
voltage range, is the one that provides equal power capability at the extremes of the range.
The exact calculation is complex, and non-idealities shift the real-world optimum value from
the theoretical one. It is therefore more practical to provide a first cut value, simple to be
calculated, and then to fine tune experimentally.
Assuming that the system operates exactly at the boundary between DCM and CCM, and
neglecting propagation delays, the following expression for kopt can be found:
Equation 6
Vin
Vinmin
P
in
lim
@
V
in
P
in
lim
@
V
in
mi
n
11.5
22.5
3
3.5
4
0.5
1
1.5
2
2.5
system optimally
compensated
system not
compensated
k = 0
k = kopt
k
Vin
3
k
1
3
V
1
V
VFF
csx
=
=
()
R
max
in
min
in
max
in
min
in
R
opt
V
3
k
+
=
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相關代理商/技術參數 |
參數描述 |
|---|---|
| L6566B | 功能描述:開關變換器、穩壓器與控制器 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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