It has best-in-class light-load efficiency and non-destructive AC zero-crossing detection
Power Integrations LinkSwitch-TNZ family ICs combine power conversion with lossless generation of AC zero-crossing signals and are typically used for system clock and timing functions. Designs using the highly integrated LinkSwitch-TNZ IC are more flexible than discrete solutions, reducing the number of components by 40% or more. In addition to achieving 80+ efficiency in a low-power flyback design, the very low power consumption at light loads via on/off control allows more functions (displays, wireless connectivity, sensors, etc.) to be active during system standby. The device family supports buck, buck-boost, and flyback converter topologies.
Each device integrates a 725 V power MOSFET, an oscillator, a current source for self-biased high-voltage switching, frequency modulation, fast (cycle-by-cycle) current limiting, hysteresis thermal shutdown, and output and input overvoltage protection circuitry on a monolithic IC.
The LinkSwitch-TNZ IC consumes less than 100 A in standby, enabling power supply designs to meet global no-load and standby regulations. The MOSFET current limit mode can be selected by the capacitance value of the Bypass pin. The high current-limit level provides the maximum continuous output current, while the low level allows the use of small, low-cost surface-mount inductors. A full suite of protection features enables a safe and reliable power supply that protects equipment and systems from input and output overvoltage faults, device overtemperature faults, loss of regulation, and power output overload or short circuit faults.
Lossless zero-crossing signal generation.
Buck, buck-boost, and flyback topologies are supported.
3% regulation over the entire line and load range.
Selectable device current limit.
66 kHz operation with precise current limit.
Low-cost, off-the-shelf inductors can be used.
Reduce the size and cost of magnetic components and output capacitors.
Frequency jitter reduces the complexity of EMI filters.
X capacitor discharge function (LNK331X only).
Soft start limits the stress on system components at startup.
Automatic restart of short-circuit and open-loop faults.
Output overvoltage protection (OVP).
Line-input overvoltage protection (OVL).
Hysteretic overtemperature protection (OTP).
The extended creepage distance between the drain pin and all other pins improves field reliability.
725 V MOSFET rating with excellent surge immunity.
NEMKO (EN62368-1) and CB (IEC62368-1) certified.
The IC standby supply current is less than 100 A
The on-off control provides constant efficiency over a wide load range.
Easily meet all global energy efficiency regulations.
No-load power consumption is less than 30 mW with external bias.
Home and building automation.
Dimmers, switches and sensors with and without neutrals.
Household appliances. Internet of Things and Industrial Control.
A 6 W isolated flyback power supply reference design kit that uses the LinkswitchTM-TNZ LNK3306D lossless generation of AC zero-crossing signals.
Specifications:90 VAC 305 VAC input, 12 V, 05 A output.
Applications:Household appliances and industrial power supplies.
Comply with all existing and proposed energy efficiency standards, including ERP
The AC line has a no-load power consumption of <30 MW
The standby power exceeds 350 MW while meeting the maximum input power of 500 MW.
Operating mode efficiency is DOE6 and EC CoC (V5) compliant.
The LNK3306D is a highly integrated solution.
Low component count, integrated 725 V power MOSFETs, current sensing, and protection.
Wide-range AC input.
The isolated zero-crossing signal output is synchronized with the AC line.
Full load efficiency > 80% under nominal line
EN550022 and CISPR-22 Class B conducted EMI compliant.
2. Use LinkswitchTM -TNZ LNK3307D for zero-crossing detectionReference design kit for a 5 W general-purpose input non-isolated buck converter.
Specifications:90 VAC 300 VAC input; 5V 500mA output.
Applications:Home building automation and the Internet of Things.
5 V 500 mA output for wireless (WiFi, NBIOT, etc.) and relay power.
Buck converters that use off-the-shelf inductors, low cost, and component count.
1.25" x 1.25" x 0.6"Compact solutions.
AC zero-crossing signal output.
Optimized for <10 dB audible noise performance.
50 MW of no-load input power.
Excellent output voltage linear regulation (<2% 5 vtyp).
Reduces power consumption during output short-circuit faults.
Low output voltage ripple of 100 mVpk-PK.
6 dB of conducted EMI margin.
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