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AP2358 Datasheet(PDF) 8 Page - AIT Components Ltd.
AITCOMPONENTS [AIT Components Ltd.]
AP2358 Datasheet(HTML) 8 Page - AIT Components Ltd.
/ 12 page
AiT Semiconductor Inc.
AC-DC PWM CONTROLLER
CURRENT MODE PWM POWER SWITCH FREQ SHUFFLING
- JUN 2016 RELEASED -
- 8 -
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 V
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 V
capacitor to provide a fast startup and yet
low power dissipation design solution.
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.
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 V
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
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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