ACT518SH-T
ACT518SH-T Datasheet
ACT518
| Part | Datasheet |
|---|---|
ACT518SH-T |
ACT518SH-T (pdf) |
| PDF Datasheet Preview |
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| ACT518 ActiveQRTM Quasi-Resonant PWM Power Switch • Integrated Power MOSFET • CCM and Quasi-Resonant Operation • Adjustable up to 75kHz Switching Frequency • Integrated Patented Frequency Foldback Technique • Integrated Patented Line Compensation • Built-in Soft-Start Circuit • OCP/OLP Protection • Line Under-Voltage, Thermal, Output Over- voltage, Output Short Protections • Current Sense Resistor Short Protection • Transformer Short Winding Protection • 100mW Standby Power • Complies with Global Energy Efficiency and CEC Average Efficiency Standards • SOP-8 and DIP-7 Packages • Power Supplies for Portable Media Player, DSCs, Set-top boxes, DVD players, records • Adaptors for Small home appliances • Auxiliary Power Supply for PC,LCD TV and PDP TV conventional solutions and exceeds the latest ES2.0 efficiency standard with good margin. ACT518 integrates comprehensive protection. In case of over temperature, over voltage, short winding, short current sense resistor, open loop an d overload conditions, it would enter into auto restart mode including Cycle-by-Cycle current limiting. ACT518 is to achieve no overshoot and very short rise time even with big capacitive load with the builtin fast and soft start process. In full load condition, ACT518 is able to be designed to work in both CCM mode and DCM mode to meet different types of applications. QuasiResonant QR operation mode can effectively improve efficiency during DCM operation, and reduce the EMI noise and further reduce the components in input filter. ACT518SH is for application up to 10 Watt and ACT518DF is for application up to 18 Watt. Figure 1: Simplified Application Circuit ACT518 is a high performance peak current mode PWM power switch. It applies ActiveQRTM and frequency foldback technique to reduce EMI and improve efficiency. Its 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 ActiveQRTM technology, The integrated power switch increases the average system efficiency compared to Innovative PowerTM ActiveQRTM is a trademark of Active-Semi. Copyright 2014 Active-Semi, Inc. ACT518 ORDERING INFORMATION ACT518SH-T ACT518DF TEMPERATURE RANGE -40°C to 85°C PACKAGE PINS SOP-8 PACKING METHOD TOP MARK TUBE & REEL ACT518SH -40°C to 85°C DIP-7 TUBE ACT518DF PIN CONFIGURATION SOP-8 ACT518SH DIP-7 ACT518DF PIN DESCRIPTIONS PIN NAME Current Sense Pin. Connect an external resistor RCS between this pin and ground to set peak current limit for the primary switch. FB Feedback Pin. Connect this pin to optocouplers’s collector for output regulation. VDET Valley Detector Pin. Connect this pin to a resistor divider network from the auxiliary winding to detect zero-crossing points for valley turn on operation. VDD Power Supply. This pin provides bias power for the IC during startup and steady state operation. GND Ground. 7,8 DRAIN MOSFET Drain Pin. Innovative PowerTM ActiveQRTM is a trademark of Active-Semi. Copyright 2014 Active-Semi, Inc. ACT518 ABSOLUTE MAXIMUM RATINGSc PARAMETER VALUE UNIT DRAIN to GND to + 650 FB, CS, VDET to GND to + 6 VDD to GND to + 28 Continuous Drain Current, Continuous Drain Current, Maximum Power Dissipation Junction to Ambient Thermal Resistance SOP-8 DIP-7 SOP-8 DIP-7 SOP-8 DIP-7 SOP-8 DIP-7 |
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