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參數(shù)資料
| 型號(hào)： | L6566BTR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Multi-mode controller for SMPS |
| 中文描述： | 多模式開關(guān)電源控制器 |
| 文件頁數(shù)： | 29/51頁 |
| 文件大?。?/td> | 401K |
| 代理商： | L6566BTR |
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L6566B
Application information
29/51
Experience shows that this value is typically lower than the real one. Once the maximum
peak primary current, I
PKpmax
, 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 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 of a narrow input voltage
range, the VFF pin can be simply grounded, directly or through a resistor (see “
Section 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:
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
Rectified Line Voltage
DRIVER
4
R
S
Q
R1
R2
COMP
VFF
CS
GD
L6566B
1.5 V
-
Hiccup
DISABLE
VOLTAGE
FEED
FORWARD
Optional for
OVP settings
OCP
-
+
PWM
-
+
Vcsx
Clock/ZCD
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