ACT411
Rev 4, 27-Feb-14
ActivePSRTM Quasi-Resonant PWM Controller
and overload conditions, it would enter auto restart
mode including cycle-by-cycle current limiting.
FEATURES
• Patented Primary Side Regulation
ACT411 is to achieve no overshoot and very short
rise time even with big capacitive load (4000µF)
with the built-in fast and soft start process, .
Technology
• Quasi-Resonant Operation
• Adjustable up to 120kHz Switching
The Quasi-Resonant (QR) operation mode can
effectively improve efficiency, reduce the EMI noise
and further reduce the components in input filter.
Frequency
• +/-5% Output Voltage Regulation
• Accurate OCP/OLP Protection
ACT411 is idea for application up to 36 Watt.
Figure 1:
• Integrated Output Cord Compensation
Simplified Application Circuit
• Integrated Line and Primary Inductance
Compensation
• Built-in Soft-Start Circuit
• Line Under-Voltage, Thermal, Output Over-
voltage, Output Short Protections
• Current Sense Resistor Short Protection
• Transformer Short Winding Protection
• Less than 100mW Standby Power
• Complies with Global Energy Efficiency and
CEC Average Efficiency Standards
• Tiny SOT23-6 Packages
APPLICATIONS
• AC/DC Adaptors/Chargers for ADSL, PDAs,
E-books
• Adaptors for Portable Media Player, DSCs,
and Other
GENERAL DESCRIPTION
The ACT411 is a high performance peak current
mode PWM controller which applies ActivePSRTM
and ActiveQRTM technology. ACT411 achieves
accurate voltage regulation without the need of an
opto-coupler or reference device.
The ACT411 is designed to achieve less than
100mW Standby Power. By applying frequency fold
back and
ActiveQRTM technology, ACT411
exceeds the latest ES2.0 efficiency standard.
ACT411 integrates comprehensive protection. In
case of over temperature, over voltage, short
winding, short current sense resistor, open loop
Innovative PowerTM
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ActivePSRTM is a trademark of Active-Semi.