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PDF ( 数据手册 , 数据表 ) L2264

零件编号 L2264
描述 Current Mode PWM Controller
制造商 LIZE
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L2264 数据手册, 描述, 功能
Shenzhen LIZE Electronic Technology Co., Ltd
SPECIFICATION
L2264
Current Mode PWM Controller
REV 1.0
reserves the right to change this documentation without prior notice







L2264 pdf, 数据表
Shenzhen LIZE Electronic Technology Co., Ltd
L2264
Current Mode PWM Controller Frequency Shuffling
Function Description
L2264 combines a dedicated current mode PWM
controller with a high voltage power MOSFET. It is
optimized for high performance off-line flyback
converter application in sub 18W range. Ultra low
startup current and operating current together with
burst mode feature minimize the standby power
consumption and improve the switching efficiency. In
addition to reduce the external component count, the
internal synchronous slope compensation combines
with the leading-edge blanking improves system large
stability and reduces the possible subharmonic
oscillation. L2264 also have multiform general
recovery protection mode. The main function is
described as below:
loss is in proportion to thenumber of witching events
within a period of time. Therefore reducing the
switch event leads to reduction on the power loss
and thus saving the energy.For the burst mode
control circuit, L2264 self adjusts the switching
mode according to the loading condition. At the
condition of no load or light/medium load, the
FB input voltage drops below burst mode threshold
level. Device enters Burst Mode control on the basis
of the judgment. The gate drive output switches only
when VDD voltage drops below a preset level and FB
input is active. Otherwise the gate drive remains at
off to minimize the switching loss and power
consumption to the greatest extend. The frequency
control also eliminates the audio noise at any loading
conditions.
Startup Current and Startup Control
Oscillator Operation
Startup current of L2264 is designed to be extremely A resistor connected between RI and GND sets the
low at 3uA, so that VDD could be charged up above charge/discharge time of the constant current
UVLO threshold level and device starts up quickly. A source to the internal cap and thus the PWM
large value startup resistor can therefore be used to scillator frequency is determined. The relationship
minimize the power loss, predigest the design of
between RI and switching frequency follows the below
startup circuit and provides reliable startup in
equation within the specified RI in Kohm range at
application. For the design of AC/DC adaptor with
nominal loading operational condition:
universal input range, a startup resistor of 2 MΩ, 1/8
6500
W could be used together with a VDD capacitor to
provide a fast startup and low power dissipation
FOSC =
(Khz )
RI(Kohm )
solution.
Current Sensing and Leading Edge Blanking
Operating Current
Cycle-by-Cycle current limiting is offered in
L2264.The switch current is detected by a sense
The operating current of L2264 is low at 2.3mA.
Excellent efficiency is achieved with low operating
current together and extended burst mode control
circuit.
Extended Burst Mode Operation
resistor into the sense pin. An internal leading
edge blanking circuit chops off the sense
voltage spike at initial MOSFET on state due
to snubber diode reverse recovery so that the
external RC filtering on sense input is no longer
required. The current limit comparator is disabled
At zero load or light load, most of the power
and thus cannot turn off the internal
dissipation of the switching power supply comes
from the MOSFET switching loss, the core loss of
the transformer and the loss on the snubber circuit.
The magnitude of power
MOSFET during the blanking period. PWM
duty cycle is determined by the current
sense input voltage and the FB input
voltage
Page7
2013.4














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