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AP2358 Datasheet(PDF) 8 Page - AIT Components Ltd.

Part No. AP2358
Description  AC-DC PWM CONTROLLER CURRENT MODE PWM POWER SWITCH FREQ SHUFFLING
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Maker  AITCOMPONENTS [AIT Components Ltd.]
Homepage  http://aitcomponents.com
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AP2358 Datasheet(HTML) 8 Page - AIT Components Ltd.

 
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AiT Semiconductor Inc.
www.ait-ic.com
AP2358
AC-DC PWM CONTROLLER
CURRENT MODE PWM POWER SWITCH FREQ SHUFFLING
REV1.0
- JUN 2016 RELEASED -
- 8 -
DETAILED INFORMATION
Operation Description
The AP2358 is a low power off-line SMPS Switcher optimized for off-line flyback converter applications in sub
15W power range. The Extended burst mode control greatly reduces the standby power consumption and
help the design easily to meet the international power conservation requirements.
Startup Current and Start up Control
Startup current of AP2358 is designed to be very low so that VDD could be charged up above UVLO threshold
level and device starts up quickly. A large value startup resistor can therefore be used to minimize the power
loss yet achieve a reliable startup in application. For AC/DC adaptor with universal input range design,
a 2 MΩ, 1/8 W startup resistor could be used together with a VDD capacitor to provide a fast startup and yet
low power dissipation design solution.
Operating Current
The Operating current of AP2358 is low at 2mA. Good efficiency is achieved with AP2358 low operating
current together with the Extended burst mode control features.
Soft Start
AP2358 features an internal 4ms soft start to soften the electrical stress occurring in the power supply during
startup. It is activated during the power on sequence. As soon as VDD reaches UVLO(OFF), the peak current
is gradually increased from nearly zero to the maximum level of 0.83V. Every restart up is followed by a soft
start.
Frequency shuffling for EMI improvement
The frequency Shuffling (switching frequency modulation) is implemented in AP2358. The oscillation
frequency is modulated so that the tone energy is spread out. The spread spectrum minimizes the conduction
band EMI and therefore eases the system design.
Extended Burst Mode Operation
At light load or zero load condition, most of the power dissipation in a switching mode power supply is from
switching loss on the MOSFET, the core loss of the transformer and the loss on the snubber circuit. The
magnitude of power loss is in proportion to the switching frequency. Lower switching frequency leads to the
reduction on the power loss and thus conserves the energy. The switching frequency is internally adjusted at
no load or light load condition.


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