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Zero Standby Consumption Integrated Off-Line Switcher IC


Product Details


LinkZero-AX is an integrated offline switching IC that enables designers to achieve 0.00 Watts of standby energy consumption in auxiliary power supplies. LinkZero-AX features an innovative power-down mode that effectively turns off the auxiliary power supply when the end product is idle or in standby. Power-down mode is triggered by a signal accessible to a microcontroller, completely shutting down internal switch control circuits. However, while in this power-down mode, the bypass pin remains regulated, allowing the LinkZero-AX IC to be awakened with a reset pulse or button press.

When paired with CapZero and SENZero, LinkZero-AX reduces standby power waste in high power products to as low as 5 mW, or effectively zero. Alternatively, while in power down mode, LinkZero-AX offers a simple means of providing up to 500uA at 4V from the regulated BYPASS pin. This current can be used to power a system wake up sensor while in power down mode while the rest of the system is in standby. This functionality, although increasing system standby power consumption, provides a simple means to power a low current sensor without requiring the power supply to switch.

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 230 VAC input*
  • Easily meets all global energy efficiency regulations with no added components
  • ON/OFF control provides constant efficiency to very light loads


  • Ultra low consumption standby and auxiliary supplies

*IEC 62301 Clause 4.5 rounds standby power use below 5 mW to zero.


Output Power (Max) - Open Frame, 230V 4.50 W
Output Power (Max) - Open Frame, Univ 4.00 W
Breakdown Voltage 700 V
Voltage - Input (Min) 85 V
Voltage - Input (Max) 265 V
Auto-Restart & Overvoltage Response Latch Off
IC Package SO-8C
Internal Switch Yes
Mounting Type Surface Mount
Over-Temperature Response Hysteretic
Temperature - Operating (Min) -40 °C
Temperature - Operating (Max) 150 °C
Control Scheme Primary-side
Control Features
Frequency Jittering
Auto-Restart/Latching Fault Response
On/Off Control
Power-down Mode
Protection Features
Output Undervoltage
Input Overvoltage
Input Undervoltage
Output Overvoltage
Output Short Circuit
Output Open Loop
Output Profile CV
Topology Flyback
Product Sub-Type PMIC
Secondary Response Auto-restart
Voltage - Start-up 3.00V