Part No. LNK304GN
Introduction:
Link Switch-TN is specially designed to supplant all linear and capacitor-fed (cap dropper) non-isolated power supplies in the below 360 mA output current range at equal system cost while extending much higher performance and energy efficiency. Link Switch-TN devices integrate a 700 V power MOSFET, oscillator, simple On/Off control scheme, a high-voltage switched current source, frequency jittering, cycle-by-cycle current limit.
Features:
- Low Down cost and component count buck converter solution
- Fully integrated auto-restart for short-circuit and open loop fault safety – saves external element costs
- LNK304 uses a streamlined controller without auto-restart for very low system cost
- 66 kHz operation with precise current limit – allows low cost off-the-shelf 1 mH inductor for up to 120 mA output current
Circuit Diagram:
Working:
As with any power supply layout, all Link Switch-TN models should be tested for proper functionality on the bench. The subsequent minimum tests are recommended:
- Sufficient DC rail voltage – check that the minimum DC input voltage does not fall below 70 VDC at maximum load, minimum input voltage.
- Proper Diode Selection – UF400x series diodes are recommended only for designs that operate in MDCM at an ambient of 70 °C or below. For designs operating in continuous conduction mode (CCM) and/or higher ambientes, then a diode with a reverse recovery time of 35 ns or better, such as the BYV26C, is recommended.
When all conditions are satisfied diode must operate in CCM and DCM Mode.
Applications:
- Daily Appliances
- Light emitting diode drivers
- Control of industrial devices
- Timers of different circuits.
wendy
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