Description LinkZero™-AX combines extremely low standby/power-down energy use with the industry’s lowest component count standby supply solution. Below 3 mW at 230 VAC in power-down (PD) mode meets IEC 62301 definition of zero power consumption and is immeasurable on most power meters. LinkZero-AX is set into power-down mode using an external signal to pull the FEEDBACK pin high for 2.5 ms. Such an external signal can be generated by a system micro controller or infrared controller. In power-down mode the BYPASS pin remains regulated allowing the LinkZero-AX to be woken up with a reset pulse to pull the BYPASS pin below a reset threshold (1.5 V). Ultra low system consumption is therefore achieved without needing to disconnect the input voltage with a relay. LinkZero-AX is designed to be used in isolated or non-isolated converters. In either, the tightly specified FEEDBACK (FB) pin voltage reference enables universal input primary side regulated power supplies that cost effectively replace unregulated linear transformer and other switched mode supplies. The start-up and operating power are derived directly from the DRAIN pin. The internal oscillator frequency is jittered to significantly reduce both quasi-peak and average EMI, minimizing filter cost.
Product Highlights
Lowest System Cost with Zero Standby Consumption
• Simple system configuration provides zero consumption standby/power-down with user controlled wake up
• Very tight IC parameter tolerances improves system manufacturing yield
• Suitable for low-cost clampless designs
• Frequency jittering greatly reduces EMI filter cost
• Extended package creepage improves system field reliability Advanced Protection/Safety Features
• Hysteretic thermal shutdown protection – automatic recovery reduces field returns
• Universal input range allows worldwide operation
• Auto-restart reduces delivered power by >85% during short-circuit and open-loop fault conditions
• Simple ON/OFF control, no loop compensation needed
• High bandwidth provides fast turn on with no overshoot EcoSmart™– Energy Efficient
• Standby/power-down consumption less than 3 mW at 325 VDC input (Note 1)
• Easily meets all global energy efficiency regulations with no added components
• ON/OFF control provides constant efficiency to very light loads
(Picture: Pinout)
