LNK304DN
数据手册.pdfPOWER INTEGRATIONS LNK304DN 芯片, 离线开关, 120mA, 170mA
The is a LinkSwitch-TN lowest component count, energy-efficient off-line Switcher, specifically designed to replace all linear and capacitor-fed cap dropper non-isolated power supplies in the under 360mA output current range at equal system cost while offering much higher performance and energy efficiency. LinkSwitch-TN devices integrate a 700V 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 LNK304-306 safely limits output power during fault conditions such as short-circuit or open loop, reducing component count and system-level load protection cost.
- .
- Lowest Component Count Buck Converter Solution
- .
- Fully integrated Auto-restart for Short-circuit and open loop fault protection saves component costs
- .
- 66kHz Operation with accurate current limit, allows low cost Off-the-shelf 1mH Inductor
- .
- Tight Tolerances and Negligible Temperature Variation
- .
- High Breakdown Voltage of 700V Provides Excellent Input Surge Withstand
- .
- Frequency Jittering Dramatically Reduces EMI ~10dB
- .
- High Thermal Shutdown Temperature +135°C Minimum
- .
- Much Higher Performance Over Discrete Buck and Passive Solutions
- .
- Supports Buck, Buck-boost and Flyback Topologies
- .
- System Level Thermal Overload, Output Short-circuit and Open Control Loop Protection
- .
- Excellent Line and Load Regulation Even with Typical Configuration
- .
- High Bandwidth Provides Fast Turn-on with No Overshoot
- .
- Current Limit Operation Rejects Line Ripple
- .
- Universal Input Voltage Range 85 to 265VAC
- .
- Built-in Current Limit and Hysteretic Thermal Protection
- .
- Higher Efficiency than Passive Solutions
- .
- Higher Power Factor than Capacitor-fed Solutions
- .
- Entirely Manufacturable in SMD
- .
- EcoSmart™ - Extremely Energy Efficient
- .
- Consumes typically 50/80mW in self-powered buck topology at 115/230VAC input with no-load
Maximum ratings specified may be applied, one at a time, without causing permanent damage to the product.