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参数资料
| 型号： | L6566BH |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | ROHS COMPLIANT, SOP-16 |
| 文件页数： | 20/48页 |
| 文件大小： | 768K |
| 代理商： | L6566BH |
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L6566BH
Application information
Doc ID 16610 Rev 1
27/48
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 (5):
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 of a narrow input voltage
range, 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 “Section 5.11:
”). 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:
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
0.511.522.5
33.5
0
0.2
0.4
0.6
0.8
1
1.2
VVFF [V]
VCOMP= Upper clamp
7
9
15
Rs
Rectified Line Voltage
DRIVER
4
R
S
Q
R1
R2
COMP
VFF
CS
GD
L6566BH 1.5 V
+
-
Hiccup
DISABLE
VOLTAGE
FEED
FORWARD
Optional for
OVP settings
OCP
+
-
PWM
+
-
Vcsx
Clock/ZCD
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6566BHTR | 功能描述:电流型 PWM 控制器 MULTIMODE CONTROLLER SMPS 8V 3 mA 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 |
| L6566BTR | 功能描述:电流型 PWM 控制器 MultiMode Controller for SMPS 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 |
| L6566BTR-CUT TAPE | 制造商:ST 功能描述:L6566B Series 23 V 4.6 mA SMPS Multi-Mode Controller Surface Mount - SOIC-16N |
| L6567 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:HIGH VOLTAGE DRIVER FOR CFL |
| L6567D | 制造商:STMicroelectronics 功能描述:CFL DRVR 18V 14SOP - Rail/Tube |
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