Applications
• Chargers for cell/cordless phones, PDAs, power tools, MP3/portable
audio devices, shavers, etc.
• Standby power supply for TV, video displays, and appliances
Description
The LinkZero™-LP controller incorporates new technology which
enables the device to automatically enter into and wake up from
no-load mode or with 1 mW load while taking less than 5 mW from the
AC power. IEC 62301 specifies measurements of standby power to a
minimum accuracy of 10 mW, and so LinkZero-LP’s consumption of
substantially less than 5 mW at 230 VAC rounds to zero based on the
IEC definition. This low power level is also immeasurable on most
power meters. The accurately specified FEEDBACK (FB) pin voltage
reference enables universal input primary-side regulated power
supplies with accurate constant voltage from 5% to full load. The
start-up and operating power are derived directly from the DRAIN pin
which eliminates start-up circuitry. The internal oscillator frequency is
jittered to significantly reduce both quasi-peak and average EMI,
minimizing filter cost.