SCM1707ASA

Mornsun
AC-DC two-stage optocoupler feedback flyback controller in SOP-8 package. Ultra-wide voltage input 18~305VAC, 18~430VDC.
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Внешний вид SCM1707ASA

Технические характеристики

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Корпус SOP-8
Тип преобразователя
Максимальная частота преобразования
Напряжение питания
Гистерезис защиты по питанию
Максимальная скважность
Примечание Ultra-wide Input Voltage 18~305VAC
Рабочая температура
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Файлы 1

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SCM1707A ACDC Two-Stage Optocoupler Feedback PWM Controller Features              Packaging Ultra-wide voltage input 18VDC~305VAC Including front-stage control and back-stage control Front-stage PWM control, frequency reduced under light load Front-stage jitter frequency function Back-stage jitter frequency function Frequency reduced under light load of back-stage. The frequency drops to 2.5 kHz when approaching no-load Built-in loop compensation Current limit per cycle VDD over-voltage protection and under voltage lockout Built-in over-current protection time Output over-voltage protection Open-loop and output short-circuit protection Bus over-voltage protection Optional package: SOP-8. Please refer to "Order Information" for screen printing information Application  Isolated AC-DC converter Description SCM1707A is an ACDC two-stage secondary feedback PWM controller, suitable for off-line two-stage flyback converter controlled by optocoupler feedback. The chip includes two independent loops for control: the front-stage and the back-stage. For the front-stage, after receiving the output voltage information fed back by the auxiliary winding through the built-in error amplifier, the front-stage power switch frequency and peak current amplitude are adjusted to stabilize the bus voltage. The front-stage, equipped with the built-in oscillator with a working frequency of 90 kHz, provides a jitter frequency function. The back-stage permits the PWM loop control through optocoupler feedback, and provides constant current function after soft start and before the output voltage reaches the set value. The constant current control adopts a control mode of "TDS/T=constant" to obtain high constant current precision. Constant voltage control adopts PWM+PFM mode, in which the additional jitter function reduces the output voltage ripple, the high power efficiency improves the EMI performance, and the frequency modulation control allows a small output ripple. Inside the IC, the working frequency of the back-stage can be trimmed to high precision. There is no working clock oscillator for the chip, and the maximum working frequency of the chip is determined by the peripheral inductance parameters to facilitate a convenient frequency adjustment. In addition, a series of protection functions are integrated inside the chip to improve the reliability of the system, including output over-voltage protection (OVP), VDD over-voltage protection, VDD under voltage lockout, output short-circuit protection,Over-current protection per cycle,Over-temperature protection,back-stage input over-voltage protection and so on.All the protection functions can be automatically restored. . Typical Application Circuit Typical application circuit Ultra-wide voltage AC input 2024.02.29-A/1 Page 1 of 11 MORNSUN Guangzhou Science & Technology Co.,Ltd.reserves the copyright and right of final interpretation PDF
Документация на SCM1707ASA 

SCM1201A Transformer Driver for Isolated Power Supplies Keywords:

Дата модификации: 09.04.2024

Размер: 2.09 Мб

11 стр.

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