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參數(shù)資料
| 型號： | L6566BTR |
| 廠商： | 意法半導體 |
| 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)： | 27/51頁 |
| 文件大?。?/td> | 401K |
| 代理商： | L6566BTR |
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L6566B
Application information
27/51
Figure 15. Externally controlled burst-mode operation by driving pin COMP: timing
diagram
5.6
PWM comparator, PWM latch and voltage feedforward blocks
The PWM comparator senses the voltage across the current sense resistor Rs and, by
comparing it to the programming signal delivered by the feedforward block, determines the
exact time when the external MOSFET is to be switched off. Its output resets the PWM
latch, previously set by the oscillator or the ZCD triggering block, which will assert the gate
driver output low. The use of PWM latch avoids spurious switching of the MOSFET that
might result from the noise generated (“double-pulse suppression”).
Cycle-by-cycle current limitation is realized with a second comparator (OCP comparator)
that senses the voltage across the current sense resistor Rs as well and compares this
voltage to a reference value V
csx
. Its output is or-ed with that of the PWM comparator (see
the circuit schematic in
Figure 17 on page 29
). In this way, if the programming signal
delivered by the feedforward block and sent to the PWM comparator exceeds V
csx
, it will be
the OCP comparator to reset first the PWM latch instead of the PWM comparator. The value
of V
csx
, thereby, determines the overcurrent setpoint along with the sense resistor Rs.
The power that QR flyback converters with a fixed overcurrent setpoint (like fixed-frequency
systems) are able to deliver changes with the input voltage considerably. With wide-range
mains, at maximum line it can be more than twice the value at minimum line, as shown by
the upper curve in the diagram of
Figure 16 on page 28
. The device has the Line
Feedforward function available to solve this issue.
It acts on the overcurrent setpoint V
csx
, so that it is a function of the converter’s input voltage
Vin sensed through a dedicated pin (15, VFF): the higher the input voltage, the lower the
Vcc
(pin 5)
Vcc
ON
GD
(pin 4)
Vcc_OK
Vcc
OFF
Vcc
restart
I
charge
0.85 mA
Standby is commanded here
t
t
t
t
t
COMP
(pin 9)
t
Vout
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