Current-mode PWM Controller Integrated Circuit SCM1733ASA with <75mW Standby Consumption And 650V Power MOS

Current-mode PWM Controller Integrated Circuit SCM1733ASA with <75mW Standby Consumption And 650V Power MOS.jpg

Introduction of current-mode PWM controller SCM1733ASA

In order to achieve wider application range and lower price requirements, MORNSUN launched a new current-mode PWM controller SCM1733ASA applied to small and medium-power flyback AC/DC converter with ultra-low standby consumption of <75mW, a maximum output power of 20W, built-in high-voltage MOS and better price-performance. It features low starting current and working currently to achieve reliable start-up and achieving low consumptions.


When the AC/DC integrated circuit (IC) is fully loaded, the PWM switching frequency is fixed; after the load is reduced, the green mode is entered, and the switching frequency will step down; during no-load and light load, it will switch the intermittent mode to reduce consumptions. Multiple control modes also can provide soft-start control that reduces MOS stress and frequency jitter control to obtain good EMI. The frequency of intermittent mode is higher than 22KHz without audio noise. And it has a variety of self-recovery protection, such as VDD under-voltage lockout (UVLO), VDD overvoltage protection (OVP), cycle-by-cycle current limit protection (OCP), overload protection (OLP), and over-temperature protection (OTP).

Application of current-mode PWM controller SCM1733ASA

It can be widely applicable fields such as AC / DC adapter, set-top box power supply, auxiliary power supply, open-frame switching power supply, etc.

Typical application circuit:

Typical application circuit.jpg

Features of current-mode PWM controller SCM1733ASA

●  Extra Low Standby Consumption(<75mW)

●  Low VDD Startup and Operating Current

●  Built-in 650V Power MOS

●  Fixed 65KHz Switching Frequency

●  Built-in Leading Edge Blanking and Slope Compensation

●  Power-on Soft Start For Reducing MOS Stress

●  EMI Frequency Jitter for Softened EMI Signature

●  Audio Noise Free Operation

●  (OCP) Cycle-by-Cycle Over Current Limiting

●  VDD Under-Voltage Lockout with Hysteresis (UVLD), Over Load Protection (OLP), Over Temperature Protection (OTP), VDD Over Voltage Protection (OVP) and output short circuit protection

Please refer to the technical manual for specific product parameters:

Series Power(W) Package Topology Control Mode Vds(max)(V) HV Fsw(khz) OTP OVP OCP Datasheet Sample Buy
SCM1733A ≤20 SOP-8 Flyback - 650V - 70 Built-in Built-in Built-in

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