Active-Semi offers state-of-the-art secondary side regulator products for applications such as AC/DC Adapters, Power Supplies, and AC Line Powered LED Lamps. The ACT512 Quasi-Resonant PWM Controller can work in CCM (Continuous Current Mode) and DCM (Discontinuous Current Mode) to meet different types of applications. The simplified Power Application Circuit with ACT512 is shown below in Figure 1.
Figure 1:
The ACT512 is a high performance peak current mode PWM controller. ACT512 applies ActiveQR™ and frequency foldback technique to reduce EMI and improve efficiency. ACT512’s maximum design switching frequency is set at 75kHz. Very low standby power, good dynamic response and accurate voltage regulation is achieved with an opto-coupler and the secondary side control circuit. The idle mode operation enables low standby power of 100mW with small output voltage ripple. By applying frequency foldback and ActiveQR™ technology, ACT512 increases the average System efficiency compared to conventional solutions and exceeds the latest ES2.0 efficiency standard with good margin.
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ACT512 is a high performance peak current mode low-voltage PWM controller IC. The controller includes the most advance features that are required in the adaptor applications up to 60 Watt. Unique fast startup, frequency foldback, QR switching technique, accurate peak current line compensation, idle mode, short winding protection, OCP (Over Current Protection), OTP (Over Temperature Protection), OVP (Over Voltage Protection) and UVLO (Undervoltage-lockout) are included in the controller.
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