LNK304PN
High Performance and Energy Efficient Power Supply Replacement
- Spec name: LNK304PN
- Spec name: Integrated 700 V power MOSFET and oscillator
- Spec name: Simple On/Off control scheme
- Spec name: High-voltage switched current source
- Spec name: Thermal shutdown circuitry
- Spec name: Start-up and operating power derived from DRAIN pin voltage
- Spec name: Fully integrated auto-restart circuit
Features:
- Lowest cost and component count buck converter solution
- Fully integrated auto-restart for short-circuit and open loop fault protection
- 66 kHz operation with accurate current limit
- Tight tolerances and negligible temperature variation
The LNK304PN is specifically designed to replace all linear and capacitor-fed (cap dropper) non-isolated power supplies in the under 360 mA output current range at equal system cost while offering much higher performance and energy efficiency. LinkSwitch-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, and thermal shutdown circuitry onto a monolithic IC. The start-up and operating power are derived directly from the voltage on the DRAIN pin, eliminating the need for a bias supply and associated circuitry in buck or flyback converters. The fully integrated auto-restart circuit in the LNK304 safely limits output power during fault conditions such as short-circuit or open loop, reducing component count and system-level load protection cost. A local supply provided by the IC allows the use of a non-safety graded optocoupler acting as a level shifter to further enhance line and load regulation performance in buck and buck-boost converters.
Specifications:
- VBP: 5.55 - 6.10 V
- VBPH: 0.8 - 1.2 V
- tON(MIN): 280 - 475 ns
- tLEB: 170 - 215 ns
- TSD: 135 - 150 °C
- THSD: 75 °C
Related Document: LNK304PN IC Data Sheet
* Images are for illustration only; actual product may vary.