參數(shù)資料
型號： L6566BH
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16
封裝： ROHS COMPLIANT, SOP-16
文件頁數(shù)： 20/48頁
文件大小： 768K
代理商： L6566BH
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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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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(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
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(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
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 制造商全稱: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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