LNK304DN

POWER 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.

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Lowest Component Count Buck Converter Solution

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Fully integrated Auto-restart for Short-circuit and open loop fault protection saves component costs

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66kHz Operation with accurate current limit, allows low cost Off-the-shelf 1mH Inductor

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Tight Tolerances and Negligible Temperature Variation

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High Breakdown Voltage of 700V Provides Excellent Input Surge Withstand

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Frequency Jittering Dramatically Reduces EMI ~10dB

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High Thermal Shutdown Temperature +135°C Minimum

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Much Higher Performance Over Discrete Buck and Passive Solutions

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Supports Buck, Buck-boost and Flyback Topologies

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System Level Thermal Overload, Output Short-circuit and Open Control Loop Protection

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Excellent Line and Load Regulation Even with Typical Configuration

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High Bandwidth Provides Fast Turn-on with No Overshoot

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Current Limit Operation Rejects Line Ripple

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Universal Input Voltage Range 85 to 265VAC

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Built-in Current Limit and Hysteretic Thermal Protection

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Higher Efficiency than Passive Solutions

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Higher Power Factor than Capacitor-fed Solutions

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Entirely Manufacturable in SMD

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EcoSmart™ - Extremely Energy Efficient

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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.